Rates Ratios and Proportions

In a chemical reaction, the ratio of the mass of hydrogen to oxygen in water is always 1:8. What does this illustrate?

• Law of conservation of mass

• Law of definite proportions

• Law of multiple proportions

• Avogadro's law

Tags

NGSS.MS-PS1-5

Which of the following is an example of a percent proportion in biology?

• The percentage of oxygen in the atmosphere

• The ratio of red blood cells to white blood cells

• The percentage of water in the human body

• The ratio of nitrogen to oxygen in the air

Which law is used to calculate the percent composition of a compound?

• Law of conservation of mass

• Law of definite proportions

• Law of multiple proportions

• Avogadro's law

Tags

NGSS.MS-PS1-1

A:B=2/3

B:C=6:7

A:B:C=?

• 4:6:14

• 4:6:7

• 2:3:6

• 4:3:7

If you are going to solve a molar ratio problem, how do you set it up?

a

b

c

d

Calculated Moles B

Moles B

Moles A

Given Moles A

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A/2=B/3=C/4

A:B:C=?

• 4:3:2

• 3:4:2

• 2:3:4

• 4:3:2

2A=3B=4C

A:B:C=?

• 3:4:6

• 4:3:6

• 6:4:3

• 3:6:4

A+B=28

A:B=4:3

A-B=?

• 4

• 12

• 14

• 7

2/A=3/B=7/C

A:B:C=?

• 7:3:2

• 2:3:7

• 3:2:7

• 2:7:3

Joseph Proust is best known for his work on which principle in chemistry?

• Law of Conservation of Mass

• Law of Definite Proportions

• Law of Multiple Proportions

• Law of Combining Volumes

Tags

NGSS.MS-PS1-5