Modules 1-2

Question 1

The Law of Definite Proportions

Answer 1

All samples of a pure compound contain the same elements in the same proportion by mass.

Question 1

The Law of Definite and Multiple Proportions

Answer 1

When two elements react to form more than one compound, a fixed mass of one element will react with masses of the other element in a ratio of small, whole numbers.

Question 2

Dalton’s Atomic Theory

Answer 2

1. Matter is composed of atoms
2. All atoms of a given element are the same and differ from other elements
3. Compounds are formed when atoms of different elements unite in fixed proportions
4. A chemical reaction involves rearrangement of atoms. No atoms are created, destroyed, or broken apart