Module 3

Question 1

The Law of Mass Conservation

Answer 1

Matter cannot be created or destroyed; it can only change form.

Question 2

Element

Answer 2

Any substance that cannot be decomposed into less massive substances

Question 3

Compounds

Answer 3

Substances that can be decomposed into elements by chemical means

Question 4

The Law of Definite Proportions

Answer 4

The proportion of elements in any compound is always the same

Question 5

The Law of Multiple Proportions

Answer 5

If two elements combine to form different compounds, the ratio of masses of the second element that react with a fixed mass of the first element will be a simple, whole-number ratio.