Match each item with the correct statement below.

a. can be observed without any change in the identity of the substance.
b. the capacity to do work.
c. can be observed only when there is a change in composition of a substance.
d. substance that changes to a gas easily at room temperature.
e. the fact that matter can be neither created nor destroyed in a chemical change.
f. any chemical reaction that gives off energy.
g. the change of one or more substances into other substances.
h another term for chemical change.
i. the amount of matter contained in a unit of volume.
j. any chemical reaction that absorbs energy.
k. the type of change in which the identity of substances does not change.

choose from these
1. energy
2. volatile
3. chemical reaction
4. chemical change
5. endothermic
6. exothermic
7. density
8. physical property
9. law of conservation of mass
10. chemical property
11. physical change

The terms and their definitions are as follows:

1. Energy
B. The capacity to do work.
Energy comes in different forms, each relating to a different type of work. For example, kinetic energy and potential energy.

2. Volatile
D. Substance that changes to gas easily at room temperature
Volatile substances do not have strong attractive forces between their molecules, so they are easily overcome at room temperature and the substance evaporate. For example, petrol.

3. Chemical Reaction
H. Another term for chemical change

4. Chemical Change
G. The change of one or more substances into other substances
Chemical changes involve rearrangement or removal of atoms from a substance

5. Endothermic
J. Any chemical reaction that absorbs energy
These reactions require the addition of heat energy to take place

6. Exothermic
F. Any chemical reaction that gives off energy
Exothermic reactions are associated with a rise in temperature of the system

7. Density
I. The amount of matter contained in a unit volume
Density is characteristic of a substance and independent of the amount that is present

8. Physical property
A. Can be observed without any change in the identity of the substance
Physical changes include breaking and state changes

9. Law of conservation of mass
E.The fact that matter can be neither created nor destroyed in a chemical change. 
This is true for any reaction in the universe

10. Chemical property
C. Can be observed only when there is a change in composition of a substance

11. Physical Change
K. The type of change in which the identity of substances does not change

Ais stronge