WorksheetsMP3 - Final Quizziz
Total questions: 34
Worksheet time: 5hrs 30mins
Which TWO of the following statements are related to a postulate (assumption) of the Kinetic Molecular Theory? Select TWO answer choices.
Gas particles are in constant motion because they are STRONGLY ATTRACTED TO EACH OTHER.
Gas particles are in constant motion giving them a LARGE AMOUNT OF KINETIC ENERGY.
Gas particles are in constant motion so they LOSE KINETIC ENERGY when they collide with the walls of the container.
Gas particles are in constant motion giving them a LARGE AMOUNT OF POTENTIAL ENERGY.
Gas particles are in constant motion and are VERY FAR APART.
Which of the following is true of a limiting reagent?
I. It is a reactant
II. It limits the amount of product formed
III. It is the reactant left over
I, II, and III
II only
I only
I and II
How many molecules of water are in 0.005g of ice (frozen H2O)?
1.67 x 10^20
5.43 x 10^22
3.01 x 10^24
2.17 x 10^21
How many moles are in 200 grams of NH3 ?
1.20 x 1026 mol
1.03 X 1025 mol
11.7 mol
3400 mol
The diagram shows a chemical equation for the production of sodium chloride, NaCl.
2Na(s)+Cl2(g)→2NaCl(s)
When 2.3 g of Na(s) reacts with excess Cl2(g), how many grams of NaCl will be produced?
4.6 g
5.8 g
2.3 g
6.9 g
How many atoms are in a 4.67 g sample of silicon?
3.62 x 10^24
2.81 x 10^24
4.59 x 10^21
1.00 x 10^23
During an investigation, a student burns magnesium to form magnesium oxide.
2Mg+O2→2MgO
The student calculates a theoretical yield of 35.3 g of magnesium oxide. If the student recovers (produces) 30.2 g of magnesium oxide, what is the percent yield?
63.4%
85.6%
74.9%
70.5%
In a chemical reaction the reactant in _____ is left over after a reaction, and the_____ reactant is completely consumed (used up) in the reaction.
excess, limiting
limiting, product
excess, molar mass
limiting, excess
How many molecules are present in a 135 g sample of Teflon, which has a formula of C2F4?
6.13 x 1023 molecules
5.13 x 1023 molecules
8.13 x 10 23 molecules
9.13 x 1023 molecules
This is what you call a reactant that you have enough of. The one that DOES NOT run out.
Limiting Reactant
Excess Reactant
Highly Reactant
Super Reactant
How many moles are in 16.9g of water (H2O)?
16.9 mol H2O
305. mol H2O
.938 mol H2O
1.06 mol H2O
What is the mass of 0.75 moles of potassium permanganate (KMnO4)?
0.75 g
118.5 g
82.5 g
0.0084 g
Given the following equation:
2Al + 6HCl → 2AlCl3 + 3H2
If 3.00 grams of H2 were produced, how many grams of Al reacted?
108.0 g
60.8 g
26.7 g
0.33 g
Cl2 + 2KBr → Br2 + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?
KCl = 74.55 g/mol ; KBr = 119.00 g/mol
749 g
223 g
479 g
814 g
When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?
90.4%
104%
96.15%
1.04%
A chemical reaction that theoretically could produce 200 g of substance only produces 140 g.
What is the percent yield in this reaction?
70%
142%
0.7%
60%
The total pressure of a gas mixture is 1 atm. The mixture contains 0.31 atm nitrogen, 0.14 atm hydrogen, and an unknown pressure of carbon dioxide. What is the partial pressure of the carbon dioxide in the mixture?
0.15 atm
0.33 atm
0.47 atm
0.55 atm
Potassium chlorate decomposed into potassium chloride and oxygen gas.
2KClO3→ 2 KCl + 3O2
How many grams of oxygen gas will be given off from 50.0 grams of potassium chlorate [KClO3] ?
9.84 grams
19.6 grams
33.3 grams
75.0 grams
When a substance is heated, the molecules move _______ and get __________.
faster , further apart
slower, closer together
faster, closer together
slower, further apart
Which of these changes will increase the vapor pressure of water in a sealed container?
Add more water and reseal the container.
Shake the container vigorously and let the water settle.
Add salt to the water and reseal the container.
Increase the temperature of the water in the container.
A sample of 0.800 mol of nitrogen has a pressure of 0.600 atm and a volume of 30.0 L. What is its temperature?
(Ideal gas law:
PV=nRT,
R=0.082 atm⋅L/mol⋅K)
22.5K
219K
274K
343K
As water starts to freeze, the molecules of water
gain thermal energy.
move more freely.
increase in size.
decrease in speed.
A sample of 0.02 mol of oxygen has a temperature of 399K and a volume of 5.00 L. What is its pressure?
(Ideal gas law: PV=nRT, R=0.082 atm⋅L/mol⋅K)
0.13 atm
0.66 atm
3.28 atm
19.5 atm
A sample of helium gas is stored in a tank at 18 atm and 20°C. How do these conditions compare to the conditions of a gas at STP (0°C and 1atm)?
lower pressure and lower temperature than STP
higher pressure and lower temperature than STP
lower pressure and higher temperature than STP
higher pressure and higher temperature than STP
A piece of chalk, CaCO3,
(molar mass= 100 g/mol) has an initial mass of 43.5 grams. The mass of the chalk decreased to 39.6 grams after use. Which of these is the closest value to the amount of chalk used?
0.0400 moles
0.400 moles
1.85 moles
3.90 moles
How many molecules are contained in 125 grams of oxygen gas (O2)?
6.02 x 10^23
1.75 x 10^23
2.35 x 10^24
4.70 x 10^24
How many atoms are there in a 1.00 mole sample of nickel?
1.20 x 10^23 atoms
6.02x 10^23 atoms
1.20 x 10^24 atoms
1.81 x 10^24 atoms
How many molecules are in two moles of oxygen gas,
O2?
3.01 x 10^23 molecules
1.2 x 10^24 molecules
3.61 x 10^24 molecules
9.63 x 10^24 molecules
If the pressure exerted by a gas at 298.15 K in a volume of 0.044 L is 3.81 atm, how many moles of gas are present?
.0068 mol
