In an experiment 4.5kg of candle was completely burnt. Th e heat produced was measured to be 180.000kj. Calculate the calorific value of the candle.​

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.

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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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.

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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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 .

If an atom or molecule gains an electron, it becomes negatively charged (an anion).

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.

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.

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.

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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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​

The concentration of the acid would be Molarity of acid is 0.55952 M

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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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:

Answer: look at the image for the answer and the explanation

Explanation:

If the students repeat the experiment with same variables as before, then there would be no change in the  results.

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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Taking into account the reaction stoichiometry, 30.28 grams of Hg are formed using 2.7 grams of mercury (II) oxide.

The 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:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The 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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169.2K is the equilibrium temperature of the system after the insulating wall is removed.

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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Answer:

14

Explanation:

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.

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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Answer:

The x-axis (horizontal) and the other along the y-axis (vertical).

Explanation:

hope that helped. :')

Granulocytes are leukocytes that have visible granules and agranulocytes are leukocytes that don't have visible granules.

Leukocytes, widely known as white blood cells, are blood cells that lack haemoglobin, have nucleus, and can move. They protect the body from disease and infection by swallowing foreign objects and cell debris, eradicating infectious agents, killing cancer cells, or manufacturing antibodies. Bone marrow produces white blood cells, and organs like the kidneys, liver, and spleen control how much of them are generated at any given time.

The two categories of white blood cells, are granulocytes and agranulocytes.

Agranulocytes lack cytoplasmic granules or sacs, whereas granulocytes do. In the battle against infection and disease, each type of granulocyte and agranulocyte serves different function.

Basophils, neutrophils, and eosinophils are the three different types of granulocytes.

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The mass of sliver deposited at the cathode during the electrolysis of Nitrate (AgNO₃) solution is 0.0011 gram.

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.

The empirical formula of ether is C4H10O.

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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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?

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.

The molarity of both Li+ and SO42- ions in a 0.611 M solution of Li2SO4 is 1.22 M.

Lithium sulfate is a white inorganic salt with the formula Li₂SO₄.

When lithium sulfate (Li2SO4) dissolves in water, it dissociates into Li+ and SO42- ions:

Li2SO4(s) → 2 Li+(aq) + SO42-(aq)

If we assume that Li2SO4 dissociates completely in solution, then we can calculate the molarity of the Li+ and SO42- ions separately.

For Li+, we can use the stoichiometry of the dissociation reaction to see that the concentration of Li+ ions is twice the concentration of Li2SO4:

[L i⁺] = 2 × [Li₂SO4] = 2 × 0.611 M = 1.22 M

For SO42-, we also need to take into account that each formula unit of Li2SO4 produces two SO42- ions. Therefore, the concentration of SO42- ions is twice the concentration of Li2SO4:

[SO4²⁻] = 2 × [Li₂SO4] = 2 × 0.611 M = 1.22 M

So the molarity of both Li+ and SO42- ions in a 0.611 M solution of Li2SO4 (assuming complete dissociation) is 1.22 M.

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Calcium nitrate chemical formula is Ca(NO3)2 or CaN2O6. Looking at the calcium nitrate molecular formula will give us the results below.

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.

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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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.

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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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

The following observations could indicate that a reaction had taken place:

C. A rise in temperature

D. A drop in temperature

A 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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Acid phosphoric Hydrogen is a triprotic acid, which means that each molecule of acid contains three protons that are acidic.

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.

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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Answer:

Filtration

Explanation:

FILTRATION = A technique that uses a porous barrier to separate a solid from a liquid.

As the formation of HF is an exothermic reaction, the temperature of the surroundings would increase.

An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.

In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.

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