Free Printable AP Chem practice Quiz

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AP Chem practice Quiz

Total questions: 29

Worksheet time: 7hrs 15mins

Name

Class

Date

What are the coefficients that will balance the skeleton equation below?

__Na + __F₂ → __NaF

1, 2, 1

2, 1, 2

1,1,1

2,2,2

What are the coefficients that will balance the skeleton equation below?

___N₂ + __H₂ → __NH₃

1,3,2

1,2,3

3,2,1

1,2,1

__C₆H₁₂O₆ + __O₂ --> __H₂O + __CO₂

1,6,6,6

already balanced

1,6,1,6

2,12,12,12

What number do I need to balance the following chemical reaction?

$C_4H_8+$ _ $O_2\rightarrow4CO_2+4H_2O$

When the temperature of matter increases the particles...

speed up and move closer

speed up and move farther apart

slow down and move closer together

slow down and move farther apart

Which container will have a lower pressure?

left

right

they both have the same pressure

I don't know

A balloon of Argon gas has a volume of 150. mL when its pressure is 0.647 atm. What will the pressure of the gas be at a volume of 98.3 mL if the temperature remains constant?

0.987 atm

1.53 atm

2.36 atm

97.1 atm

The gas in an aerosol can exerts a pressure of 3.00 atm at 25°C. Directions on the can warn the user not to keep the can in a place where the temperature exceeds 100°C. What would the gas pressure in the can be at 100°C?

3.76 atm

2.40 atm

12 atm

0.75 atm

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈what is the limiting reactant? C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

Oxygen

C₁₀H₈

Water

Carbon Dioxide

10.

From the reaction: B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O

What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

B₂H₆ = 27.68 g/mol

13.8 g O₂

3.91 mol of O₂

125 g O₂

41.7 g O₂

11.

When does a chemical reaction stop?

When the lab is finished

When the excess reactant is used up

When the limiting reactant is used up

Chemical reactions never stop

12.

Determine the empirical formula for a compound with the following percent composition: 15.8% carbon and 84.2% sulfur

(molar masses: C = 12.011 g/mol, S = 32.065 g/mol)

$CS_3$

$CS_2$

$C_2S_4$

$C_2S_{ }$

13.

2H₂ + O₂ --> 2H₂O

12 grams of H₂ are reacted with 36 grams of O₂.

Calculate the amount of excess reactant.

4.5 grams

7.5 grams

12.5 grams

36.5 grams

14.

When you place the metal in boiling water, heat flows from the _________ to the _______.

metal to the boiling water

bottom of the metal to the top half of the metal

bottom of the water to the top of the water

boiling water to the metal

15.

Define ΔH

Change in Specific Heat; Heat by one Degree Celsius

Change in Temperature; the energy we calculate; Degree Celsius

Change in Enthalpy; the energy/heat we calculate

Change in Time; time travel

16.

A slower particle has a lower energy than an identical, faster particle.

True

False

17.

Shown are the units for....

specific heat capacity

mass

temperature

energy

18.

20 g of water. The specific heat of water is 4.18 J/g°C. temperature changes from 25° C to 20° C, how much heat energy (Q) moves from the water to the surroundings?

418 Joules

209 J

83 J

4.18 J

19.

If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

-80,371.2

44,938.6

80,371.2

112,575.9

20.

Endothermic reactions feel

warm

cold

21.

What does Gibbs Free Energy tell us?

How much energy is given off by a reaction.

The tendency of a reaction to become "random"

How spontaneous a reaction is.

22.

Which of the following would most likely lead to a spontaneous reaction.

A high negative enthalpy.

A low negative enthalpy.

A high positive enthalpy.

A low positive enthalpy.

23.

What are the best conditions to lead towards a spontaneous reaction?

high negative enthalpy, high temp, high negative entropy

high positive enthalpy, high temp, high negative entropy

high negative enthalpy, low temp, high positive entropy

high negative enthalpy, high temp, high positive entropy.

24.

Entropy increases from solid, liquid to gas. Why?

Molecular disorder increases

Molecular randomness decreases

Molecules are more energetic

Molecules are more reactive

25.

Which represents a decrease in entropy?

sublimation of CO₂

boiling water

condensation of steam on cold glass

NaCl dissolving in water

26.

Which sample has the lowest entropy?

HINT - Look at the phase of each chemical....

1 mole of KNO₃(l)

1 mole of KNO₃(s)

1 mole of H₂O(l)

1 mole of H₂O(g)

27.

What is a spontaneous process ?

slow process

fast process

process that needs an external intervention to occur

process that does not need external intervention to occur / keep happening

28.

Of the following reactions, which of the following is only spontaneous at high enough temperatures?

∆H –, ∆S +

∆H +, ∆S –

None of the Above

∆H –, ∆S –

∆H +, ∆S +

29.

A chemical reaction has the following changes in enthalpy and entropy.

ΔH=+380kJ

ΔS=+870J/mol

What is the temperature range for this reaction that allow it to be spontaneous?

T>437K

T<437K

T>−437K

100 %

AP Chem practice Quiz

Total questions: 29

Worksheet time: 7hrs 15mins

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