Energy changes in chemistry test questions - CCEA

1

The thermal decomposition of calcium carbonate is an example of:

2

Burning a fuel such as coal or natural gas is an example of:

3

Using the following bond energies, calculate the energy change for the reaction below.

2H2 + O2 -> 2H2O

H-H 436 kJ , O=O 498 kJ , O-H 463 kJ

4

Which statement is correct?

5

Which statement is correct?

6

Using the following bond energies, calculate the energy change for the reaction below.

CH4 + 2O2 -> CO2 + 2H2O

C-H 412 kJ , O=O 498 kJ , O-H 463 kJ , C=O 743 kJ

7

Using the following bond energies, calculate the energy change for the reaction below.

C + O=O -> O=C=O

C=O 743 kJ, O=O 498 kJ

8

In an exothermic reaction profile diagram, the:

9

In an endothermic reaction profile diagram, the

10

Which of the following statements is true?