Chemistry 3/22

The law of definite _____ says that a compound contains elements in a fixed ratio by mass.

• proportions

• preliminaries

The law of definite proportions says that a compound contains elements in a fixed ratio by mass.

For example, in carbon dioxide or CO2, there are always ____ oxygen atoms for every one carbon atom, 2 moles of oxygen for every 1 mole of carbon atoms, or 12 grams of carbon for every 32 grams of oxygen.

• 1

• 2

The composition of the fertilizer is ____ nitrogen atoms for every 1 phosphorous atom per 4 potassium atoms.

• 10

• 11

The mass of the element in the compound by the mass of the total compound and then multiply by _____

• 100%

• 50%

The law of constant _____ states that any sample of a compound will be made up of the same elements in the same ratio.

• composition

• comparison

The percent composition can be used as a _____ factor.

• conversion

• comparison

These three molecules have different _____ formulas.

• molecular

• atom

There are three basic ways to quantify matter:

• count

• mass

• volume

• area

The ____ is a way of counting representative particles.

• mole

• ratio

1 mole = 6.02 x 1023 representative particles

This is also known as ______

• Avogadro’s number.

• Beethoven's number.