Chemistry Unit 5 Review

Multiple Choice

The specific heat of aluminum is 0.900 J/g^oC . How much heat is required to

raise the temperature of a 30.0 g block of aluminum from 25.0°C to 75.0°C?

• 1670 J

• 1.50 J

• 0.540 J

• 1350 J

Collision theory-

Rate constant k=Zfp

• k = rate constant (how fast the reaction occurs)

• Z = collision frequency (how often molecules collide)

• f = fraction of collisions with enough energy to react (activation energy requirement)

• p = probability that molecules collide in the correct orientation

• Collide with each other

• Collide with enough energy

• Collide in the correct orientation

For Reactions to happen, particles must

Multiple Choice

What is the rate of reaction?

• The time it takes for a reaction to occur.

• How much energy is needed for a reaction to occur.

• The energy required to break a bond.

• Collision Theory

Multiple Choice

A 10.0 L sealed container holds 3.00 moles of H₂, 4.00 moles of He, 3.00 moles of CO₂

The total pressure of the gases in the container is 2.50 atm

Find: partial pressure of CO₂.

• 10 atm

• 0.30 atm

• 0.75 atm

• 3.0 atm

Multiple Choice

How many Joules of energy are required to change 10 gram of ice at -2 C to water at 20 C?

• 440 J

• 880 J

• 3840 J

• 66,000 J

Multiple Choice

How much liquid water can you change 20 C if you apply 20,000 J?

• 500 g
• 100,000 g
• 250 g
• 350 g

Multiple Choice

What line segment represents only the solid state?

• A-B
• B-C
• C-D
• D-E

Multiple Choice

What pressure, in atm, is exerted by 2.50 L of gas containing 1.35 mol at 320 K?
PV=nRT

• 14.19 atm
• 16.53 atm
• 18.42 atm
• 22.54 atm

Multiple Choice

When 0.250 moles of a gas is placed in a container at 25 °C, it exerts a pressure of 700 mm Hg. What is the volume of the container?

• 0.557 Liters
• 6.57 Liters
• 8.74 Liters
• 0.0087 Liters

Multiple Choice

A gas tank carrying 55L of Cl₂ has a pressure of 2.6atm and a temperature of 289K. How many moles of chlorine gas are in the tank?

• 6.03 mol

• 0.55 mol

• 1.45 mol

• 0.75 mol

Multiple Choice

The phase change identified in the image as #2 is called _____ and is _____.

• evaporating, endothermic

• condensing, exothermic

• melting, endothermic

• melting, exothermic

Multiple Choice

What change occurs from F to E?

• sublimation
• deposition
• melting
• condensation

Multiple Choice

In which region(s) does temperature remain constant?

• Region 1, 3, & 5
• Region 2 & 4
• Region 1 only
• Region 1 & 2

Multiple Choice

Copper, Stainless Steel, Carbon Steel, and Zinc were all heated using the same thermal energy.  What material would be the coolest after being heated?

• Copper
• Carbon Steel
• Zinc
• Stainless Steel

Some text here about the topic of discussion

Multiple Choice

Which container will have lower pressure?

• First container

• second container

Multiple Choice

Charles' Law States...

• As Volume goes up temperature goes up 

• As Pressure goes down volume goes down 

• As Pressure goes up volume goes down

• As Pressure goes up temperature goes up

Multiple Choice

The Ideal Gas Law is understood as: PV=nRT. How does the Ideal Gas Law explain how a hot air balloon rises in the sky?

• P is a constant. So as T increases as the air is heated at constant n, volume of the balloon increases causing it to rise.

• P and V are kept constant, so as T increases, n must decrease causing the balloon to rise.

• V is constant, so as T increases at a constant n, pressure increases causing the balloon to rise.

• None of these

Multiple Choice

How many moles of helium are contained in a 5.00L canister at 101kPa and 30.0^oC?

• 2.02 moles

• 0.201 moles

• 0.494 moles

• 4.99 moles

Multiple Choice

If I have 5.6 liters of gas in a piston at a pressure of 1.5 atm and compress the gas until its volume is 4.8 L, what will the new pressure inside the piston be?

• 6.3 ATM

• 2.4 ATM

• 1.8 ATM

• 8.6 ATM

Multiple Choice

2SO₂(g)+O₂(g)⇌2SO₃(g)
Removing O₂(g) will

• shift equilibrium right
• shift equilibrium left
• decrease temperature
• have no change

Multiple Choice

Which of the two graphs reaches equilibrium?

• The left one.
• The right one.
• Both of them.
• Neither.

Multiple Choice

During equilibrium, the amount of the products and the amount of the reactants are __________.

• equal

• constant (unchanging)

• constantly increasing

• constantly decreasing

Multiple Choice

Use the following reaction to answer the following questions.

Reaction: N₂(g) + 3H₂(g) ⇌  2NH₃(g)

What will be the result if the volume of the reaction vessel is decreased (aka increase in pressure) for the reaction above?

• The equilibrium shifts to the left.

• The equilibrium shifts to the right.

• The equilibrium does not change.

• The equilibrium constant changes.

Multiple Choice

CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g)  

This is the expression for the equilibrium constant for the reaction shown above.

Multiple Choice

What is the energy required to get the reaction started?

• Inhibitor Energy

• Catalyst Energy

• Activation Energy

• Surface Energy

Multiple Choice

What letter represents the activation energy?

• A

• B

• C

• D

Multiple Choice

What factors effect rate of reaction?

• Temperature, Concentration, Pressure and Energy

• Surface Area, Concentration, Energy and Pressure

• Temperature, Pressure, Concentration and Surface area

• Pressure, Surface area, Density and Energy

Multiple Choice

Increase in temperature of the reactants can do one of the following

• Slow collision frequency

• Allow less effective collision between the particles

• Cause particles to lose speed

• Increase collision between the particles thus increasing the rate.

Multiple Choice

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions because there are more collision sites

Multiple Choice

How does a catalyst work in speeding up a reaction?

• By lowering the activation energy or reaction

• by giving them more energy

• by making them more available

Multiple Choice

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Multiple Choice

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

• Chemical Equilibrium
• Chemical Balance
• Chemical Constant
• Chemical Reaction

Multiple Choice

Which of the following is NOT true at equilibrium?

• The forward and reverse reactions proceed at the same rate.
• The concentrations of reactants and products do not change.
• The concentration of the reactants is equal to the concentration of the products.
• The forward and reverse reactions continue to occur.

Multiple Choice

For the reaction...
N_{2 (g)} +  3 H_2 (g) <=> 2 NH_{3 (g)}

If the pressure in the system is increased,  which substance(s) will increase in concentration?

• N₂  (as 2 mol gas  → 4 mol gas)
• H₂ (as 2 mol gas  → 4 mol gas)
• N₂ and H₂ (as 2 mol gas  → 4 mol gas)
• NH₃ (as 4 mol gas  → 2 mol gas)