Answer:
to make it basic from acidic
As the temperature of a gas increases with the volume remaining constant, the pressure of the gas A) decreases B) increases C ) remains the same
Answer:
B) increases
higher temperature = higher pressure
Write a chemical equation showing how each behaves as an acid when dissoblbed in water.
a. H2s
b. NH4
Answer:
a. H₂S(aq) + H₂O(l) ⇄ HS⁻(aq) + H₃O⁺(aq)
b. NH₄⁺(aq) + H₂O(l) ⇄ NH₃(aq) + H₃O⁺(aq)
Explanation:
According to Bronsted-Lowry acid-base theory,
An acid is a substance that donates a H⁺.A base is a substance that accepts a H⁺.a. When dissolved in water, H₂S behaves as an acid according to the following equation.
H₂S(aq) + H₂O(l) ⇄ HS⁻(aq) + H₃O⁺(aq)
b. When dissolved in water, NH₄⁺ behaves as an acid according to the following equation.
NH₄⁺(aq) + H₂O(l) ⇄ NH₃(aq) + H₃O⁺(aq)
Identify the element in group 15, period 3 by drawing a Lewis Dot Structure
Answer:
Phosphorus
Explanation:
Lewis Dot Structure is a structural representation of a molecule that shows valence electrons of a molecule.
The element in group 15, period 3 is Phosphorus (P). Phosphorus has an atomic number 15 and valence electrons are 5. So, the lewis structure will show 5 dots around P atom.
There is about 30 g of Californium-252 left, how much time has elapsed?
You haven't provided two critical pieces of info needed to answer this question. First, what's the half-life of Californium-252, and second, what's the initial amount of Californium-252. Given these two values, you can then set up an exponential equation to find the time elapsed.
Daniella found an iron metal cube. The volume of the cube is 20 cm3 as shown below.
non
20.0 cm
If the density of iron is 7.9 g/cm3, what is the mass in grams of this iron cube?
A) 0.395 g
B) 2.53 g
C) 27.99
D) 158 g
Answer:b) 2.53
Explanation:
What is the formula for Na+ F-
calculate h30+ for a 8.86*10^3 hbr solution
[H₃O⁺] = 8.86 x 10³ M
Further explanationThe dissociation of water :
H₂O(l)⇒H⁺+OH⁻
Hydrogen ions H⁺ bond with H₂O to form H₃O⁺ ions(hydronium ion)
When acid(Hbr acid) is in the presence of water(dissociates), the H⁺ ions bond with water molecules to form hydronium, the reaction :
HBr(aq)+H₂O→H₃O+(aq)+Br−(aq
So Ionization of HBr :
[tex]\tt HBr\rightarrow H_3O^++Br^-[/tex]
[HBr]= 8.86 x 10³,
From equation ratio [H₃O⁺] : HBr = 1 : 1, so
[tex]\tt [H_3O^+]=8.86\times 10^3[/tex]
? C+? O2 +? CO2,
what is the maximum amount of CO2 which
could be formed from 13.19 g of C and 15.92 g
of O2?
Answer in units of g.
Look at the mole ratio in the balanced equation
2CO + O2 ==> 2CO2
3.44 mol O2 x 2 mol CO/mol O2 = 6.88 moles CO
Perform the following
mathematical operation, and
report the answer to the correct
number of significant figures.
1.987/3.46 = [?]
Answer:
.574
Explanation:
smallest number of digits in the expression was 3, so the final answer should have 3 sig figs
Guys please help me I have a final exam
a 20.0 l tank of co2 contains 68.0 grams of gas at 500.0 kpa of pressure what is the temperature of the tank ?
Explanation:
ok that is ans k............
The temperature of the 20 L tank containing 68 g of carbon dioxide, CO₂ at 500 KPa is 778.5 K
How to determine the mole of CO₂Mass of CO₂ = 68 gMolar mass of CO₂ = 44 g/mol Mole of CO₂ =?Mole = mass / molar mass
Mole of CO₂ = 68 / 44
Mole of CO₂ = 1.545 moles
How to determine the temperature Volume (V) = 20 L Number of mole (n) = 1.545 moles Pressure (P) = 500 KPa Gas constant (R) = 8.314 LKPa/Kmol Temperature (T) =?Using the ideal gas equation, the temperature of the gas can be obtained as follow:
PV = nRT
Divide both side by nR
T = PV / nR
T = (500 × 20) / (1.545 × 8.314)
T = 778.5 K
Thus, the temperature of the tank is 778.5 K
Learn more about ideal gas equation:
https://brainly.com/question/4147359
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Suggest reasons for and against the inclusion of hydrogen in the main group of the periodic table
Answer:
See explanation
Explanation:
Hydrogen has only one valence electron. Sometimes, hydrogen is included as part of group 1 or 17 in the periodic table. Is this correct? Well, the answer to this question is not so straight forward!
Let us remember that hydrogen forms a univalent positive ion H^+ just like the group 1 elements, but it also forms a univalent negative ion H^- just like group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements. This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.
However, it is convenient to include hydrogen in the main groups 1 or 17 when discussing its chemical properties in order to make it easier to assimilate. If we place hydrogen in group 1, we can understand that it forms univalent positive ions. Similarly, if we place it in group 17, we understand that it forms univalent negative ions.
Most times hydrogen is just written separately at the top right corner of the periodic table and not as a member of any group because of the issues outlined above.
Hydrogen is placed in the main group of the periodic table since it has only one electron in it and it also behaves like alkali metal properties.
Hydrogen atom:Hydrogen forms a univalent positive ion [tex]H^+[/tex]group 1 elements, but it also forms a univalent negative ion [tex]H^-[/tex]group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements.
This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.
If we place hydrogen in group 1, we can understand that it forms univalent positive ions and if it is placed in halogen group it will form univalent negative ion.
Find more information about Hydrogen here:
brainly.com/question/25597694
how many moles of CO2 are in 210 liters at STP of the compound
Answer:
9.4 mol CO₂
General Formulas and Concepts:
Chemistry - Gas Laws
Using Dimensional AnalysisSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KExplanation:
Step 1: Define
210 L CO₂ at STP
Step 2: Identify Conversions
22.4 L = 1 mol at STP
Step 3: Convert
[tex]210 \ L \ CO_2(\frac{1 \ mol \ CO_2}{22.4 \ L \ CO_2} )[/tex] = 9.375 mol CO₂
Step 4: Check
We are given 2 sig figs. Follow sig fig rules and round.
9.375 mol CO₂ ≈ 9.4 mol CO₂
In Space, an astronaut releases a wrench from his hand. The wrench has a mass of 4 grams and is traveling with a velocity of -15m/s. The Astronaut’s mass is 70kg. What is his Velocity?
Answer:
860 cm/s
Explanation:
Let P = momentum of wrench-man system before throwing the wrench and P' = momentum of wrench-man system before throwing the wrench.
From the law of conservation of momentum,
P = P'
P = 0 (since both Astronaut and wrench were initially stationary) and P' = m₁v₁ + m₂v₂ where m₁ = mass of wrench = 4g = 0.004 kg v₁ = velocity of wrench after releasing the wrench = -15 m/s m₂ = mass of Astronaut = 70 kg and v₂ = velocity of Astronaut after releasing the wrench.
So, P = P'
0 = m₁v₁ + m₂v₂
-m₁v₁ = m₂v₂
dividing both sides by m₂, we have
v₂ = -m₁v₁/m₂
substituting in the values of the variables, we have
v₂ = -0.004 kg × (-15 m/s)/70 kg
= 0.06 kgm/s ÷ 70 kg
= 8.6 × 10⁻⁴ m/s
= 860 × 10⁻² m/s
= 860 cm/s
Which of these correctly describes the energy that makes the carousel turn
Answer:
F
Explanation:
A carousel can be made to rotate using different sources of energy. One may decide to use electric energy, manual effort, water energy or heat energy as in a candle carousel.
When the candle is lit, heat energy is supplied and warm air rises heating up the air near the carousel eventually causing it to start rotating.
Hence heat from the candle leads to a current of warm air that rises up, causing the carousel to start rotating.
3. Two people are playing tug of war. One person pulls to the right with 32 N of force. The other person pulls to the left with 37 N of force. How strong is the net force and in which direction?
The net force = -5 N
The direction : to the left(negative sign)
Further explanationNet force : the sum of all forces acting on an object
Force is a vector quantity that has both magnitude and direction,
We agree that the move up and to the right is a positive sign, while down and to the left is a negative sign.
The direction of the force (horizontal motion) is to the right (+32 N), and to the left (-37 N), so the net force :
[tex]\tt \sum F=F~right-F~left\\\\\sum F=32-37\\\\\sum F=-5~N[/tex]
what is the volume in liters at STP of 14.5 grams of CO2 gas
Answer:
7.38 Liters
Explanation:
moles CO2 = 14.5g/44g/mol = 0.33 mole
At STP 1 mole of any gas occupies 22.4 Liters.
∴0.33 mole CO2 x 22.4 L/mol = 7.38 Liters
write down any four uses of solution
.I will mark him\her as brilliant
Answer:
because it will help u
because it will make u to understand the question very well
The temperature of a plastic cup is 70 °F. It is filled with water that is
40 °F. Which of the following describes how thermal energy is
transferred?
Answer:
From the plastic cup to the water
Explanation:
The thermal energy is transferred from the plastic cup to the water inside the cup.
This is because thermal energy moves from a body at high temperature to one at lower temperature.
Thermal energy is the energy due to the motion of the particles of a medium. An increase in thermal energy leads to a rise in the average kinetic energy of the system. It moves over a gradient usually from a body with a high temperature to one at a lower temperature.What is the molarity of 2.0 moles of glucose
in 4.0 L of glucose solution?
Answer:
0.5 M
General Formulas and Concepts:
Chemistry - Aqueous Solutions
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define
2.0 mol glucose
4.0 L glucose solution
Step 2: Find Molarity
Substitute: M = 2.0 mol / 4.0 LDivide: M = 1/2Evaluate: M = 0.5What is the mass of 0.8 mole of water molecules.
Answer:14.4g
Explanation:
**How many milliliters of water have to be added to 150 mL
of 0.5 M HCl to reduce the concentration to 0.10 M HCl?
Answer:
I RFID not understand the question?
A 62.9 g sample of ground water is found to have a lead concentration of 13.97 ppm. Calculate the mass of lead in the sample in milligrams.
Answer:
0.879 mg
Explanation:
To solve this problem we need to use the definition of ppm:
ppm = μg solute / g solutionWith the above information in mind we can calculate the micrograms of lead using the concentration (13.97 ppm) and mass of solution (62.9 g):
μg lead = 13.97 ppm * 62.9 gμg lead = 878.713 μgFinally we convert μg to mg:
878.713 μg * [tex]\frac{1mg}{1000ug}[/tex] = 0.879 mg of leadteeth to Bachile can be see more than once
Come as the chemical mantragen has the valence electrons each hydrogen has one walence electron, and chionner
Campie eles are for this went compound
.
NH H-
CI
ou
which action would not help a person stay safe during a tornado Giving brainliest
Answer:
B.... i think so, not sure lol
Answer:
B. Driving to get supplies
Explanation:
Don't drive in the middle of a tornado EHLBFDHS
_______join allows movement in all directions
Explanation:
ball and socket joint.
it made of the round end of a bone fitting into a cup shaped socket in another.
example of ball and socket joint is the shoulder and hips
Farmers breed cows to produce high amounts of milk. This is an example of...
A. natural selection
B. variation in species
C. selective breeding
D. inbreeding
For the chemical reaction:
ALOH3 (s)
= Al2O3 (s)
+ H20 (l)
Calculate the mass of water formed when 100 g of Al(OH)3 is heated. (AI = 27: 0 - 16; H = 1)
Answer:
35.1 g
Explanation:
Given data:
Mass of Al(OH)₃ = 100 g
Mass of water formed = ?
Solution:
Chemical equation:
2Al(OH)₃ → Al₂O₃ + 3H₂O
Number of moles of Al(OH)₃:
Number of moles = mass/molar mass
Number of moles = 100 g/ 78 g/mol
Number of moles = 1.3 mol
now we will compare the moles of Al(OH)₃ with water.
Al(OH)₃ : H₂O
2 : 3
1.3 : 3/2×1.3 = 1.95
Mass of water produced:
Mass = number of moles ×molar mass
Mass = 1.95 mol × 18 g/mol
Mass = 35.1 g
balance by oxidation number method<br />KMnO4 + Na2O₂ + H2 so4 ko2so4 +<br />Mosou4 + Na2so<br />4 + O2 + H₂O
Answer:
8H2SO4 + 2KMnO4 + 5Na2O2 => 8H2O + 2MnSO4 + 5Na2SO4 + 5O2 + K2SO4
have:
Explanation:
Acetylene gas is often used in welding torches because of the very high heat produced when it reacts with oxygen O2 gas, producing carbon dioxide gas and water vapor. Calculate the moles of oxygen needed to produce 1.3mol of carbon dioxide. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.
Answer:
3.2 moles of carbon dioxide
Explanation:
When C₂H₂ reacts with O₂ the chemical reaction is:
C₂H₂ + 5/2O₂ → 2CO₂ + H₂O
Where 1 mole of acetylene produce 2 moles of carbon dioxide.
Based on the chemical equation of this reaction, there are produced twice the moles of acetylene in moles of carbon dioxide assuming a compete reaction.
If 1.6 moles of acetylene reacts there are produced:
1.6 moles Acetylene * (2 moles Carbon Dioxide / 1 mole Acetylene) =
3.2 moles of carbon dioxide
Octet Rule states that atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas. Depending on this fact answer the following question :
1)What is an incomplete octet?
2)What is an odd-electron molecule?
3)Why are there extra electrons in the expanded octet?
Answer:
1. an incomplete octet is an valence shell that is not fully stable since it doesn't have 8 electrons
2.an odd electron molecule is a molecule that has an odd number of electrons but is still stable
3. there are extra electrons in an expanded octet because the molecules' central atoms make extra bonds that don't comply with the octet rule.
Explanation:
