The volume of 10.0 moles of N₂ gas at STP is 224.0 L.
What is STP?
STP stands for "Standard Temperature and Pressure". It is a set of standard conditions used in chemistry and physics for measuring and comparing properties of gases. The standard temperature used in STP is 0 degrees Celsius (273.15 Kelvin), and the standard pressure is 1 atmosphere (101.325 kPa or 760 mmHg).
At standard temperature and pressure (STP), the temperature is 273.15 K (0 °C) and the pressure is 1 atmosphere (atm).
To determine the volume of 10.0 moles of N₂ gas at STP, we can use the ideal gas law, which relates the pressure, volume, temperature, and amount of a gas. The ideal gas law is:
PV = nRT
where P is the pressure, V is the volume, n is the amount of gas in moles, R is the gas constant, and T is the temperature in Kelvin.
At STP, the pressure is 1 atm and the temperature is 273.15 K.Substituting these values into the ideal gas law, we get:
V = (nRT) / P
V = (10.0 mol x 0.08206 L atm/(mol K) x 273.15 K) / 1 atm
V = 224.0 L
Therefore, the volume of 10.0 moles of N₂ gas at STP is 224.0 L.
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Suppose the thermometer is not calibrated correctly. It gives a temperature that is 1.2° too low throughout the experiment. How would this affect the calculated molecular weight of the unknown? Explain.
NH3(g) → N₂(g) + H₂(g)
-
How many moles of N₂ will be produced by the decomposition of 4.52 moles of ammonia?
HOW DO WE GET THERE?
How many moles of N₂ are produced from 4.52 mol NH3?
It is clear from the balanced chemical equation, that two moles of ammonia decompose to give one mole of nitrogen gas. Then, 4.52 moles will give 2.26 moles of nitrogen gas.
What is ammonia ?Ammonia is an inorganic gas formed by the combination of nitrogen gas and hydrogen gas. It is a reversible reaction and the ammonia gas can be decomposed to given the hydrogen and nitrogen gases as written below:
[tex]\rm 2NH_{3}\rightarrow 3H_{2} + N_{2}[/tex]
As per the balanced chemical equation of the decomposition of ammonia gas, it is clear that, 2 moles of ammonia gives on mole of N₂.
Then 4.52 moles of ammonia will give,
4.52 / 2 = 2.26 moles of N₂.
Therefore, 2.26 moles of N₂ is produced from 4.52 moles of NH₃.
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What charge will be the result of an atom that had 5 electrons at first and then gains 3 electrons?
5 electrons , then gains 3 so it will be 8 electrons total and when it gains electrons the charge should be -3 so the element u have will have a -3 charge .
short explanation;If an atom or molecule gains an electron, it becomes negatively charged (an anion).
Brief explanation:Carbanions have 5 valence electrons and a formal charge of 1−. Two other possibilities are carbon radicals and carbenes, both of which have a formal charge of zero.
NOTE:If an object has more protons than electrons, then the net charge on the object is positive. If there are more electrons than protons, then the net charge on the object is negative. If there are equal numbers of protons and electrons, then the object is electrically neutral.
MEMORIZE THAT!! ☝️☝️If you had 1.9 x 1025 atoms of lithium and 1.9 x 1025 atoms of lead, would you have the same
number of moles?
No, they would not have the same number of moles.
What is a mole?In chemistry, a mole is a unit of measurement that represents a certain number of atoms, molecules, or ions. It is described as the quantity of a substance that has exactly as many particles as there are in 12 grams of carbon-12. This quantity, often known as Avogadro's number, is roughly 6.022 x 10^23. The atomic masses of all the atoms in a molecule are added together to form the molecular mass, which is measured in grams. Calculating chemical reactions, concentrations, and stoichiometry in chemistry requires the mole idea. A lot of different particles make up a mole. The Avogadro number is equal to one mole of any material. 6.023 x 10^23 is the Avogadro number. The products of every chemical reaction are measured using the Avogadro number.
The number of moles is dependent on the atomic mass of the element, and lithium and lead have different atomic masses. The atomic mass of lithium is 6.94 g/mol, while the atomic mass of lead is 207.2 g/mol. Therefore, even if the number of atoms is the same, the mass and number of moles would be different for each element.
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Based on your knowledge of genetics answer the following question in 3-4 paragraphs. Be sure and include relevant content vocabulary.
A 20 – year old man who has cystic fibrosis has a sister who is planning to have a child. The man encourages his sister to see a genetic counselor. What do you think the man’s reasons are for giving such advice? Please provide references that support your stance.
Answer:
The 20-year-old man's sister may be at risk of having a child with cystic fibrosis if that causes the condition. Cystic fibrosis is an inherited disorder caused by a mutation in the CFTR gene that affects the production of mucus in the body, leading to lung infections, digestive problems, and other complications. The disease is inherited in an autosomal recessive pattern, meaning that a person must inherit two copies of the defective gene (one from each parent) to develop the condition.
The man's advice to his sister to see a genetic counselor is likely motivated by his concern for her and the potential child's health. A genetic counselor is a healthcare professional who specializes in assessing and counseling individuals and families on the risks and implications of genetic conditions. A genetic counselor can provide the sister with information about her risk of being a carrier of the CFTR gene mutation and the likelihood of passing it on to her children. The counselor can also discuss the different options for testing and provide guidance on how to manage the risk of having a child with cystic fibrosis, such as through preconception or prenatal testing, genetic counseling, or assisted reproductive technologies.
The man's recommendation is in line with the current guidelines of many medical organizations, including the American College of Obstetricians and Gynecologists (ACOG), which recommend that individuals who have a family history of genetic disorders or are carriers of certain gene mutations should be offered genetic counseling and testing. This approach can help identify and manage the risk of having a child with a genetic disorder and provide support and education to families.
the compound known as diethyl ether, commonly referred to as ether, contains carbon, hydrogen, and oxygen. a 2.876 g 2.876 g sample of ether was combusted in an oxygen rich environment to produce 6.830 g 6.830 g of co2(g) co 2 ( g ) and 3.495 g 3.495 g of h2o(g) h 2 o ( g ) . insert subscripts to complete the empirical formula of ether.
The empirical formula of ether is C4H10O.
Define empirical formula.The empirical formula of a compound shows the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula of diethyl ether (C2H5OC2H5), we need to know the mass of each element present in the compound.
In this problem, we are given the mass of diethyl ether that was combusted, which is 2.876 g. When diethyl ether is combusted in an oxygen-rich environment, it produces carbon dioxide and water. The masses of these products are also given: 6.830 g of carbon dioxide and 3.495 g of water.
We can start by calculating the mass of carbon in the original sample of ether. To do this, we use the molar mass of carbon dioxide (44.01 g/mol) and the stoichiometry of the combustion reaction:
2 C2H5OC2H5 + 7 O2 → 4 CO2 + 6 H2O
The balanced equation shows that for every two molecules of ether, four molecules of carbon dioxide are produced. Therefore, we can write:
2.876 g ether × (4 mol CO2 / 2 mol ether) × (1 mol C / 1 mol CO2) × (12.01 g / 1 mol C) = 5.716 g C
We can perform a similar calculation to determine the mass of hydrogen in the sample:
2.876 g ether × (6 mol H2O / 2 mol ether) × (2 mol H / 1 mol H2O) × (1.01 g / 1 mol H) = 4.352 g H
Finally, we can calculate the mass of oxygen by subtracting the masses of carbon and hydrogen from the total mass of the sample:
2.876 g ether - 5.716 g C - 4.352 g H = 0.808 g O
Now that we know the mass of each element, we can use these values to calculate the empirical formula. We divide each mass by the molar mass of the corresponding element, and then divide the resulting values by the smallest value to obtain whole-number ratios:
C: 5.716 g / 12.01 g/mol = 0.476 mol
H: 4.352 g / 1.01 g/mol = 4.31 mol
O: 0.808 g / 16.00 g/mol = 0.0505 mol
Dividing by the smallest value (0.0505 mol) gives the following ratios:
C: 9.43
H: 85.2
O: 1.00
To obtain whole-number ratios, we can divide each value by the smallest value:
C: 9.43 / 1.00 ≈ 9
H: 85.2 / 1.00 ≈ 85
O: 1.00 / 1.00 = 1
Therefore, the empirical formula of diethyl ether is C4H10O.
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which of the following is not a factor that directly determines the rate of diffusion of molecules or ions across a membrane?
Answer: C. The amount of energy available for transport molecules.
The complete question is as follows:
Which of the following is not a factor that influences the rate of diffusion?
A. The distance of diffusion.
B. The concentration of the substance.
C. The amount of energy available for transport molecules.
D. The molecular weight of the diffusing molecules.
E. The temperature of the environment.
F. The size of the diffusing molecules.
What is diffusion?
Diffusion is the overall net movement of anything from a higher concentration to a lower concentration. A gradient in the Gibbs free energy or chemical potential drives diffusion.
The scent of a flower that quickly fills a room's still air is a common illustration. the movement of ions through a semipermeable membrane.
In conclusion, diffusion is a passive transfer of energy from a concentrated area to a less concentrated one.
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Calculate the number of oxygen atoms in 4.34×1023
formula units of calcium nitrate.
Calcium nitrate chemical formula is Ca(NO3)2 or CaN2O6. Looking at the calcium nitrate molecular formula will give us the results below.
How do molecules work?A molecule is the simplest unit of a material that keeps its content and properties. It is composed of two or even more atoms that are joined together by chemical bonds. Chemistry is based on molecules.
How do molecules work?A molecule is defined as a collection of more than two linked atoms from the same or distinct elements. Chemistry is built on molecules. The element sign and a suffix indicating the amount of atoms are used to identify molecules
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need help on this one question. And explain
Answer:
14 moles
Explanation:
This is balanced equation:
BaBr2 + K2SO4 => 2KBr + BaSO4
1 mole of BaBr2 will produce 2 moles of KBr
=> 7 moles of BaBr2 will produce 7x2 = 14 moles of KBr
A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.5032 g the mass barely changed, dropping to 0.3176 g. When the product was converted to chloride, the mass went up, to 0.3502 g. a. Is the sample carbonate? b. What are the two compounds that might be in the unknown?
Answer:
a. To determine if the sample is a carbonate, we need to calculate the theoretical mass loss if the sample were to completely decompose. Carbonates decompose to form the metal oxide and carbon dioxide:
MCO3(s) → MO(s) + CO2(g)
where M is the metal.
The molar mass of CO2 is 44.01 g/mol. The molecular weight of MCO3 is the atomic weight of the metal plus the atomic weight of carbon and 3 times the atomic weight of oxygen. We don't know the identity of the metal in this case, so we can't calculate the exact molecular weight. However, we can use the fact that the mass barely changed upon heating to assume that the mass loss is due to the release of a small amount of CO2, and assume that the rest of the compound remained unchanged. From the data given, the mass loss upon heating is:
0.5032 g - 0.3176 g = 0.1856 g
Assuming that all of this mass loss is due to CO2, we can calculate the theoretical mass loss for a carbonate with a molecular weight of MCO3 as:
(44.01 g/mol) / (MCO3 molecular weight) = 0.1856 g / 0.5032 g/mol
Solving for the molecular weight of MCO3, we get:
MCO3 molecular weight = 168.2 g/mol
This corresponds to the molecular weight of calcium carbonate (CaCO3). Therefore, the sample is likely to be calcium carbonate.
b. If the sample is not a carbonate, then it must be a mixture of two compounds, one of which decomposes upon heating and the other does not. Let's call these compounds A and B, where A is the compound that decomposes upon heating. We can set up a system of equations based on the mass changes:
0.5032 g → 0.3176 g (heating, compound A decomposes)
0.3176 g + x → 0.3502 g (conversion to chloride, compound B forms)
where x is the mass of compound B formed. Solving for x, we get:
x = 0.3502 g - 0.3176 g = 0.0326 g
This means that the mass of compound A before heating is:
0.5032 g - 0.1856 g = 0.3176 g
The mass of compound B before conversion to chloride is:
0.3176 g - 0.0326 g = 0.2850 g
We don't know the identity of compounds A and B, but we can calculate their percentage composition based on their mass and the total mass of the sample (0.5032 g):
% A = (0.3176 g / 0.5032 g) x 100% = 63.06%
% B = (0.2850 g / 0.5032 g) x 100% = 56.61%
These percentages add up to more than 100%, which means that there was likely some measurement error. It is also possible that the two compounds are not pure substances, but mixtures of different compounds. Without more information, we cannot determine the identity of compounds A and B.
A biochemist carefully measures the molarity of trypticase in 58.mL of cell growth medium to be 12. μM. Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to 16.mL. Calculate the new molarity of trypticase in the cell growth medium.
Molarity = (moles of solute / volume of solution). Since the moles of solute (trypticase) stays the same, the molarity increases when the volume of solution decreases.
What is the volume ?The volume of a word is an expression of the amount of content in a written piece. It can be measured in terms of the number of words, pages, or characters contained within a text. A text with a high volume will contain more content than a text with a low volume. Plagiarism-free writing is essential for a text to have a high volume, as plagiarized content does not contribute to the overall value of the piece.
The new molarity of trypticase in the cell growth medium would be 48 μM.
Molarity = (moles of solute / volume of solution)
Molarity (original) = (12 μM / 58 mL)
Molarity (new) = moles of solute (original) / volume of solution (new)
Molarity (new) = (12 μM * 58 mL) / 16 mL
Molarity (new) = 48 μM
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Which technique uses a porous barrier to separate a solid from a liquid?
Answer:
Filtration
Explanation:
FILTRATION = A technique that uses a porous barrier to separate a solid from a liquid.
Arrange the following aqueous solutions in order of decreasing freezing points: 0.10 m KNO3, 0.10 m BaCl2, 0.10 m ethylene glycol [C2H4(OH)2, antifreeze], and 0.10 m Na3PO4.
Answer:
The freezing point of a solution is lowered compared to the freezing point of the pure solvent. The amount of depression of the freezing point is proportional to the molality of the solute. The greater the molality of a solution, the lower its freezing point. To compare the freezing points of these solutions, we need to determine which one has the highest molality.
First, we need to determine the number of particles that each solute will produce in solution, as this affects the amount of depression of the freezing point.
KNO3 dissociates into two ions: K+ and NO3-, so it will produce two particles per formula unit.
BaCl2 dissociates into three ions: Ba2+ and two Cl-, so it will produce three particles per formula unit.
Ethylene glycol does not dissociate in solution, so it will produce one particle per molecule.
Na3PO4 dissociates into four ions: three Na+ and one PO43-, so it will produce four particles per formula unit.
Now, we can calculate the molality (moles of solute per kilogram of solvent) for each solution:
For 0.10 m KNO3: molality = 0.10 mol / 1 kg = 0.10 m
For 0.10 m BaCl2: molality = 0.10 mol x 3 particles / 1 kg = 0.30 m
For 0.10 m ethylene glycol: molality = 0.10 mol / 1 kg = 0.10 m
For 0.10 m Na3PO4: molality = 0.10 mol x 4 particles / 1 kg = 0.40 m
So, the solutions in order of decreasing freezing points are:
0.10 m Na3PO4 (highest molality)
0.10 m BaCl2
0.10 m KNO3 and 0.10 m ethylene glycol (same molality, but KNO3 has a smaller van't Hoff factor than ethylene glycol, so it will have a slightly higher freezing point)
Explanation:
which of the following would be an observation you could make to indicate that a reaction had taken place? check all that apply.
A. an increase in volume
B. a decrease in volume
C. a rise in temperature
D. a drop in temperature
The following observations could indicate that a reaction had taken place:
C. A rise in temperature
D. A drop in temperature
What is a reactionA change in temperature can indicate that energy has been released or absorbed during the reaction, which can be an indicator that a chemical reaction has taken place.
Changes in volume, on the other hand, are not always an indicator that a chemical reaction has occurred, as they could also be due to physical changes (such as changes in pressure or the addition/removal of a gas). Therefore, A and B alone are not sufficient to indicate that a reaction has taken place.
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What is the total number of grams of naoh (formula mass = 40. ) needed to make 1. 0 liter of a 0. 20 m solution?.
Option (d) is correct. The total number of grams of sodium hydroxide needed to make 1. 0 liter of a 0. 20 m solution is 8.0 gram. It is calculated using the expression of molarity.
Molarity is defined as the ratio of solute moles and solution length. We can obtain the acid solution molarity by dividing the amount of moles of the solution in which it was dissolved. It is a measure of the concentration of a chemical species, in particular of a solute in a solution in terms of amount of substance per unit volume of solution. It can be expressed as,
Molarity = Moles / volume in liter
So the moles of sodium hydroxide = 0.2 mole
The Mole of sodium hydroxide is 0.2 mole and Molar mass of sodium hydroxide is 40 g/mole. We have to determine the mass of sodium hydroxide.
Mass is the product of the moles and the molar mass. It can be expressed as,
mass = moles * molar mass
= 0.2 * 40
= 8 gram
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The complete question is,
What is the total number of grams of NaOH (formula mass = 40.) needed to make 1.0 liter of a 0.20 M solution?
(1) 20. g (2) 2.0 g (3) 80. g (4) 8.0 g
1. Calcutate the mass of Sliver deposited
at the Cathode during the electrysis of
Nitrate (AgNO3) Solution, H,
bliver
CL use of
of
Current
DIO
The mass of sliver deposited at the cathode during the electrolysis of Nitrate (AgNO₃) solution is 0.0011 gram.
What is electrolysis ?
The term electrolysis is defined as a chemical reaction that happens when an electric current is pass over through a substance. The substance gets or loses an electron during chemical reaction.
Given:
Current = 0.10 ampere
Tome = 10 second
Molar mass of Ag = 108 g mol−1
1 Faraday = 96500 C
Q = i × t
=0.1 × 10 × 60
= 60 Coulombs
Weight of the substance deposited = ZQ
Z=M/nF
n-factor of AgNO3 = 1
Z = 108 / 1 × 96500
= 0.0011 gram
Thus, 0.0011 gram is the mass of Sliver deposited at the Cathode during the electrolysis of Nitrate (AgNO₃) Solution.
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Your question is incomplete, most probably your question was
Calculate the mass of Sliver deposited at the Cathode during the electrolysis of Nitrate (AgNO3) Solution,use a current of 0.10 ampere for 10 minutes.
3 Below is a heating curve for a pure substance. It shows how the temperature rises over time, when the substance is heated until it melts, then boils. Temperature / °C 115- 17 solid liquid gas Time a What is the melting point of the substance? b What happens to the temperature while the substance changes state? c The graph shows that the substance takes longer to boil than to melt. Suggest a reason for this. d How can you tell that the substance is not water? f Sketch a rough heating curve for pure water.
The substance's melting point is 15 °C. A heating curve is a plot as well as graph in which a substance is heated up over time.
What is heating curve?A heating curve is a plot as well as graph in which a substance is heated up over time to determine how much energy it absorbs and how its condition changes as the temperature rises.
(A) The material is in a solid state at point A.
At B, the material has begun to dissolve. It occurs in both solid and liquid forms.
Point C: The material is liquid at this time.
Point D: The stuff has already begun to boil. Both the liquid and gaseous forms of it exist.
(b) The substance's melting point is 15 °C.
(c) The substance's boiling point is 110 °C.
(d) The temperature doesn't change while the state changes.
(e) If the material had been water, it should have had a melting point of 0°C and a boiling point of 100°C. Thus, it is not water.
Therefore, the substance's melting point is 15 °C.
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A thermally insulated system consists of 1.00 mol of a diatomic gas at 148 K and 2.00 mol of a solid at 178 K that are separated by a rigid insulating wall. Find the equilibrium temperature of the system after the insulating wall is removed, assuming that the gas obeys the ideal-gas law and that the solid obeys the Dulong-Petit law. HINT: the gas does no work during the expansion, so Qgas = AEint = nc', AT. K Submit
169.2K is the equilibrium temperature of the system after the insulating wall is removed.
What is equilibrium?Generally speaking, a condition of equilibrium is one in which nothing is changing. A body in equilibrium won't undergo any energy exchanges, either positive or negative. Equilibrium is defined significantly differently in biology, physics, and chemistry.
Yet the underlying idea is the same. A body in balance will be least affected by outside influences. Even when external pressures are present, the opposing forces often have a balanced impact on the item under consideration.
for gas, n1=1mol
T1= 148K
for solid,n2=2mol
T2=178K
for conservation of energy, ΔQ= Qgas+ Qsolid=0
Q= CvΔT
0=Cvgas(Teql-148) + Cvsolid(Teq-178)
0= 5/2×1×R(Teql-148) + 3×2×R(Teq-178)
Tequi= 169.2K
Therefore, 169.2K is the equilibrium temperature of the system after the insulating wall is removed.
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Hydrogen gas (h2) and oxygen gas (o2) combine. Which change occurs that indicates a release of bond energy?.
The creation of water (H2O), as well as the production of heat and light, signal the release of bond energy when hydrogen gas (H2) combines with oxygen gas (O2).
Bond Energy, commonly referred to as average bond enthalpy or just bond enthalpy, is a measurement that provides information about how strong a chemical bond is. "The average value determined from the bond dissociation enthalpies (in the gaseous phase) of all the chemical bonds of a certain type in a given chemical compound," is how the word "bond energy" is defined by the IUPAC. As a result, the average amount of energy needed to break one of these chemical bonds may be thought of as the bond energy of a chemical bond in a specific molecule.
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Oxidation number for S in the compound
ZnSO3
In ZnSO3, O is oxidized to a value of two. S in ZnSO3 is oxidized to +4 by zinc. ZnSO3 has a +2 Zn oxidation number.
What do you mean by "composite"?When two or more separate chemical components are mixed in a specific proportion, the resultant substance is called a compound. The collision of the components creates biochemical connections that have been complex to break.
Which are they—elements or compounds?There is just one sort of atom per element, making them pure substances. When a variety of different type of elements are combined chemically in predetermined ratios, the resultant product is called a compound. The Earth naturally has about 94 of the almost 118 elements that make up the periodic table.
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As k2o dissolves in water, the oxide ion reacts with water molecules to form hydroxide ions.
The molecular and net ionic equations of reaction between potassium oxide (K₂O) and water (H₂O) are [tex]\mathrm{K_2O(aq)+H_2O(l)\rightarrow 2 KOH(aq)}[/tex] and [tex]\mathrm{O_2^{-}(aq)+H_2O(l)\rightarrow 2OH^{-}(aq)}[/tex]. The base, acid, and spectator ions in this reaction are O²⁻, water, and potassium.
The ions that do not participate in the interaction are referred to as spectator ions. They are found in the chemical reaction's reactant and product sides. The proton donor ion is referred to as acid and the proton acceptor ion is referred to as the base.
Let's write the complete ionic equation for the reaction between potassium oxide (K₂O) and water (H₂O).
[tex]\mathrm{2K^{+}(aq)+O^{2-}(aq)+H_2O(l)\rightarrow 2 K^{+}(aq)+2OH^{-}(aq)}[/tex]
Now, the net ionic equation is written as,
[tex]\mathrm{O_2^{-}(aq)+H_2O(l)\rightarrow 2OH^{-}(aq)}[/tex]
Then, the molecular equation is,
[tex]\mathrm{K_2O(aq)+H_2O(l)\rightarrow 2 KOH(aq)}[/tex]
From the equations, we can tell the acid ion is water, the base ion is O²⁻, and the potassium ion is the spectator ion.
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The complete question is -
As K₂O dissolves in water, the oxide ion reacts with water molecules to form hydroxide ions. (a) Write the molecular and net ionic equations for this reaction. (b) Based on the definitions of acid and base, what ion is the base in this reaction? (c) What is the acid in the reaction? (d) What is the spectator ion in the reaction?
calculate the number of atoms of chlorine atoms contained in 0.20g of DDT
Answer: look at the image for the answer and the explanation
Explanation:
The students then decide to repeat the experiment but cover the table with pieces of carpet. If the students repeat the experiment with same variables as before, what should happen to the results? Explain. (S8P3.b)
If the students repeat the experiment with same variables as before, then there would be no change in the results.
What are variables?
Variables are defined as any characteristics, number or quantity which can be measured . It can also be called as a data item . It is called as variable because they can vary and can have variety of values.
There are three types of variables 1) manipulated variable where in a condition is specified, 2) responding variable which is dependent on manipulated variable 3)controlled variable which do not change.
Example of manipulated variables are number of hours spent by a student studying , that of responding variable is result of a student and temperature is an example of controlled variable.
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According to the following reaction, how many grams of mercury will be formed upon the complete reaction of 32.7 grams of mercury (II) oxide?
2HgO (s) —> 2Hg (l) + O2 (g)
Taking into account the reaction stoichiometry, 30.28 grams of Hg are formed using 2.7 grams of mercury (II) oxide.
Reaction stoichiometryThe balanced reaction is:
2 HgO → 2 Hg + O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
HgO: 2 molesHg: 2 molesO₂: 1 moleThe molar mass of the compounds is:
HgO: 216.59 g/moleHg: 200.59 g/moleO₂: 32 g/moleBy reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
HgO: 2 moles ×216.59 g/mole= 433.18 gramsHg: 2 moles ×200.59 g/mole= 401.18 gramsO₂: 1 mole ×32 g/mole= 32 gramsMass of H₂O formedThe following rule of three can be applied: if by reaction stoichiometry 433.18 grams of HgO form 401.18 grams of Hg, 32.7 grams of HgO form how much mass of Hg?
mass of Hg= (32.7 grams of HgO×401.18 grams of Hg)÷433.18 grams of HgO
mass of Hg= 30.28 grams
Finally, 30.28 grams of Hg are formed.
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Please help!!
50.0 mL of water at 4° C frozen to ice. The volume of the ice produced is 46.0 mL. What is the density and specific gravity of the ice?
The density of the ice is approximately 1.09 g/mL and its specific gravity is approximately 1.09.
How to find the density and specific gravity of the ice?
First, we need to convert the volume of water from milliliters to grams. The density of water at 4°C is 1 g/mL. Therefore, the mass of the water is:
mass = volume × density = 50 mL × 1 g/mL = 50 g
Next, we can use the conservation of mass to find the mass of the ice produced. The mass of the ice must be equal to the mass of the water, so:
mass of ice = mass of water = 50 g
Now, we can find the density of the ice:
density = mass of ice ÷ volume of ice = 50 g ÷ 46 mL ≈ 1.09 g/mL
Finally, we can find the specific gravity of the ice by comparing its density to the density of water. Since the density of water at 4°C is 1 g/mL, the specific gravity of the ice is:
specific gravity = density of ice ÷ density of water = 1.09 g/mL ÷ 1 g/mL ≈ 1.09
Therefore, the density of the ice is approximately 1.09 g/mL and its specific gravity is approximately 1.09.
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Cite the evidence that indicates that both physical and chemical changes occur when a copper wire is heated in a Bunsen burner flame. (More than one answer may be correct.) The original appearance was not restored when the wire cooled, instead a new substance appears. No change in the composition of the copper wire could be detected The original appearance was restored when the wire cooled. The wire changed color during the heating
Answer:
When a copper wire is heated in a Bunsen burner flame, the copper's color changes to become a glowing red. It won't be restored to its original appearance after cooling. Instead, it becomes a black material called copper (II) oxide, which is 79.9% copper and 20.1% oxygen (was 100% copper before it was burned). This chemical change occurred as the oxygen in the air combined with the copper during the heating process.
Explanation:
The evidence that indicates that both physical and chemical changes occur when a copper wire is heated in a Bunsen burner flame are:
The original appearance was not restored when the wire cooled, instead a new substance appears.
The wire changed color during the heating.
What is a physical change ?A physical change is a type of change in which the form, shape, size, or state of matter of a substance is altered, but the substance itself remains the same chemically. In other words, the composition of the substance does not change.
Examples of physical changes include changes of state (such as melting, freezing, or vaporization), changes in shape or size (such as crushing or cutting), and changes in appearance (such as changing color or texture).
A chemical change involves breaking or making of chemical bonds. This include formation of a new compounds and some color changes. Therefore,
The original appearance was not restored when the wire cooled, instead a new substance appears, states a physical change and
The wire changed color during the heating indicates a chemical change.
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Suppose that an aspartic acid (aspartate) residue in the active site of an enzyme was mutated to alanine. As expected, the alanine mutant was inactive, suggesting that the aspartic residue was critical to the catalytic mechanism. Which mutation is most likely to restore wild-type level of activity to the alanine mutant?
a. A to Y
b. A to E
c. A to L
d. A to M
e. A to K
Answer:
b. A to E
Explanation:
The aspartic acid (aspartate) residue in the active site of the enzyme is likely critical to the catalytic mechanism because it is a charged amino acid and can participate in ionic interactions that stabilize the transition state of the catalyzed reaction. Since the alanine mutant is inactive, we need to introduce a charged amino acid at this position to restore the activity.
Out of the options given, the mutation that is most likely to restore the wild-type level of activity to the alanine mutant is (b) A to E. The glutamic acid (glutamate) amino acid is similar to aspartic acid in its chemical properties, as both are negatively charged amino acids. Therefore, introducing a glutamic acid residue at the mutated position is likely to restore the ionic interaction necessary for catalytic activity.
Select Strong Acid as the analyte and Phenolphthalein as the indicator in the titration interactive. To the tenths place, determine the volume of titrant added at each of these points. Indicator No Indicator colorless 14 equivalence point: 25.1 mL 7 end point: 14 ml pH = 0.00 0 50 25 Titrant Added (mL) Suppose that you did not know the concentration of the acid. Use the end-point volume, the concentration of the base, and the volume of the acid to calculate the concentration of the acid.
The concentration of the acid would be Molarity of acid is 0.55952 M
What is acid?Acid is a type of chemical compound that has a sour taste and can cause corrosive damage to materials. Acids are often used as cleaning agents and are found in many everyday products, such as vinegar and lemon juice. Acids are also found in nature, such as in the form of rainwater. When acid reacts with a base, it creates a neutralized solution, which is known as a salt. Acids have a pH level that is less than 7 and bases have a pH level that is higher than 7. Acids can be strong or weak depending on the concentration of hydrogen ions in the solution. Strong acids are highly corrosive, while weak acids are less reactive.
The concentration of the acid can be determined by using the following equation:
Molarity of acid = (Volume of base (mL) * Concentration of base (M) )/ Volume of acid (mL)
In this case, the concentration of the acid would be calculated as follows:
Molarity of acid = (14 mL * 1 M )/ 25.1 mL = 0.55952 M
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How many nitrate ions are present in 4.18 x 10-20 grams of copper (II) nitrate?
Answer:
4.46 x 10^-22 nitrate ions
Explanation:
To find the number of nitrate ions present in 4.18 x 10^-20 grams of copper (II) nitrate, we need to use the molar mass of copper (II) nitrate and Avogadro's number.
The molar mass of copper (II) nitrate is:
Cu(NO3)2 = 63.55 g/mol (Cu) + 2(14.01 g/mol (N) + 3(16.00 g/mol (O))) = 187.57 g/mol
So 1 mole of copper (II) nitrate has a mass of 187.57 grams.
We can find the number of moles of copper (II) nitrate in 4.18 x 10^-20 grams by dividing the mass by the molar mass:
4.18 x 10^-20 g / 187.57 g/mol = 2.23 x 10^-22 moles
Each mole of copper (II) nitrate contains 2 moles of nitrate ions. Therefore, the total number of nitrate ions in 4.18 x 10^-20 grams of copper (II) nitrate is:
2.23 x 10^-22 moles x 2 nitrate ions/mole = 4.46 x 10^-22 nitrate ions
So there are approximately 4.46 x 10^-22 nitrate ions in 4.18 x 10^-20 grams of copper (II) nitrate.
Phosphoric acid, H3PO4(aq),
is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH and the concentrations of all species in a 0.100 M phosphoric acid solution.
pKa1 pKa2 pKa3
2.16 7.21 12.32
Acid phosphoric Hydrogen is a triprotic acid, which means that each molecule of acid contains three protons that are acidic.
What do protons do?Radiation therapy can make use of streams of protons produced by specialised equipment.
These electrons move in distinct orbits around the nucleus. (ii) The mass of protons, which have a positive charge, is about 1 amu. His study during this time produced a nuclear reaction that caused the first atom to "split" in two.
How do atoms work?The centre of every atom is called the nucleus, which is made up of neutral neutrons and protons (positive particles). Around the nucleus are electrons, which are negative particles. Unlike atoms of different elements, which have varying chemical characteristics and masses, all of an element's atoms have the same mass.
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