Energy Intro Form 1

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Energy Intro Form 1

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1. Given the reaction below, it is said to be *

a) Endothermic because energy is released

b) Endothermic because energy is absorbed ( or consumed ).

c) Exothermic because the energy is released

d) Exothermic because the energy is absorbed ( or consumed )

e) None of the above choices are correct.

2. The 182.6 kJ represents in the reaction below *

a) The energy needed to break the bonds

b) The energy needed to form new bonds

c) ΔH as negative number

d) the overall (net) energy change, taking more energy to form bonds than to break them

e) the overall (net) energy change, taking more energy to break bonds than to form them

3. The temperature of the environment (surroundings) from this reaction *

a) increases because an endothermic process is occuring

b) increases because an exothermic process is occurring

c) decreases because an endothermic process is occurring

d) decreases because an exothermic process is occurring

e) Stays the same.

4. How does energy flow in terms of the chemical reaction and the surroundings? *

a) Heat flows from surroundings to the chemicals and the reaction container get warmer.

b) Heat flows from the reaction to the surroundings and the surroundings get warmer.

c) Heat flows from the surroundings to the chemicals and the reaction container gets cooler.

d) Heat flows from the reaction to the surrounding and the surrounding get colder.

e) None of the choices are correct.

5. Which chemicals are the most unstable? *

a) The products because more energy is needed to break bonds than form new ones.

b) The products because more energy is released in forming bonds than breaking them.

c) The reactants because more energy is needed to break bonds than form new ones.

d) The reactants because more energy is released in forming bonds than breaking them.

e) None of the choices are correct.

6. A chemical is dropped into a cup of water and reacts. Which of the following observations would help you to determine that it was an exothermic reaction? *

The temperature of the cup, water, and air decreases.

b) The temperature of the cup, water, and air increases.

c) The temperature of the cup water and air stays the same.

d) The temperature of the water decreases but the air and cup increase.

e) The temperature of the water increases but the cup and air temperature decrease

7. An ice cube is placed on your hand. Which of the choices below correctly describes the system? *

a) Energy flows from the hand to the ice cube and the ice cube releases heat.

b) Energy flows from the hand to the ice cube and the ice cube absorbs (consumes) the heat.

c) Energy flows from the ice cube to the hand and the ice cube releases heat.

d) Energy flows from the ice cube to the hand and the ice cube absorbs (consumes) heat.

e) Melting because this physical change is exothermic.

8. Which chemical reaction is exothermic? *

Hint: Look at Table I in your Reference Table:

a) 2C + 2H2 --> C2H4

b) 2C + H2 --> C2H2

c) 2C + 3H2 --> C2H6

d) H2 + I2 --> 2HI

9. Evaporation (liquid changing into a gas) is a cooling process because *

liquids consume (absorb) energy to become gases and the process is endothermic

b) liquids lose energy to become gases and the process is exothermic

c) liquids consume (absorb) to become gases and the process is exothermic

d) liquids lose energy to become gases and the process is endothermic

10. Which physical change is exothermic? *

a) NaCl(l) --> NaCl(g)

b) NaCl(s) --> NaCl(l)

c) NaCl (s) --> NaCl (g)

d) Boiling of NH3 (l)

e) None of the choices

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