Free Printable Bio/Chem Day 4

1.

If $\Delta$ H is NEGATIVE, which of the following must be true of the reaction?

a)

The reaction is endothermic.

b)

The reaction is exothermic.

c)

The reaction is spontaneous.

d)

The reaction is nonspontaneous.

2.

Average bond energy describes the average energy required to break 1 mole of bonds in what phase?

a)

Solid

b)

Liquid

c)

Aqueous

d)

Gas

3.

Which of the following has a standard enthalpy of formation ( $\Delta H_f^o$ ) equal to zero?

a)

$CO_2$

b)

$H_2O$

c)

$O_2$

d)

$NO$

4.

Which of the following elements would you expect to have the highest entropy (S) value?

a)

$Na_{\left(s\right)}$

b)

$Br_{2\left(l\right)}$

c)

$H_{2\left(g\right)}$

d)

$Au_{\left(s\right)}$

5.

Which equation for $\Delta G$ (Gibbs Free Energy) is correct?

a)

$\Delta H-T\Delta S$

b)

$\Delta H+T\Delta S$

c)

$T\Delta H-\Delta S$

d)

$\Delta H+T+\Delta S$

6.

Which of the following is true of bonds and energy?

a)

Breaking bonds requires energy, forming bonds releases energy

b)

Breaking bonds releases energy, forming bonds requires energy

c)

Breaking bonds releases energy, forming bonds releases energy

d)

Breaking bonds requires energy, forming bonds requires energy

7.

If a reaction is spontaneous at all temperatures, what must be true of $\Delta H$ and $\Delta S$ ?

a)

$\Delta H$ must be positive and

$\Delta S$ must be positive

b)

$\Delta H$ must be negative and $\Delta S$ must be negative

c)

$\Delta H$ must be positive and

$\Delta S$ must be negative

d)

$\Delta H$ must be negative and $\Delta S$ must be positive

8.

Which of the following would increase the rate of a first order reaction?

a)

Decreasing surface area of reactant

b)

Adding a catalyst/enzyme

c)

Decreasing the concentration of reactant

d)

Decreasing the temperature

9.

The following reaction is at equilibrium:

$2H_2+O_2\rightarrow2H_2O$

Which of the following would cause the reaction to shift towards the products?

a)

Adding more $H_2$

b)

Removing some $O_2$

c)

Adding a catalyst

d)

Adding $Na^+$

10.

The place on an enzyme where the substrate binds is called the...

(a)

11.

Which of the following does NOT affect enzyme activity?

a)

Substrate concentration

b)

Temperature

c)

Pressure

d)

pH

12.

What word describes an activator or inhibitor that binds somewhere OTHER than the active site?

(a)

13.

What macromolecule class do enzymes belong to?

a)

Carbohydrate

b)

Lipid

c)

Nucleic Acid

d)

Protein

14.

What is the name of the process by which proteins lose their 3D structure at high temperatures?

(a)

15.

Enzymes increase the rate of reaction by decreasing this key quantity...

(a)

16.

Competitive inhibitors...

a)

Bind to a site other than the active site and change the shape of the enzyme

b)

Are usually small metal ions that change the shape of the enzyme

c)

Bind to the active site instead of the substrate

d)

Cannot be reversed by adding more substrate

Bio/Chem Day 4

Total questions: 16

Worksheet time: 10mins

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