Ch.3 Review

Water is known to have the following % composition, by mass:

%H = 11%

%O = 89%

This represents which law?

• Law of Conservation of Mass

• Law of Definite Proportions

• Law of Multiple Proportions

Tags

NGSS.HS-PS1-7

The law of multiple proportions was stated by whom?

• Lavoisier

• Proust

• Democritus

• Dalton

All of the following were postulates (parts) of Dalton's atomic theory except for....

• all atoms of a given element are the same

• all matter is made up of protons, neutrons, and electrons

• atoms cannot be broken down into smaller parts

• atoms can be rearranged in ordinary chemical reactions

Tags

NGSS.HS-PS1-7

When 5.0 grams of element A react with 7.0 grams of element B, the product contains....

• 12.0 grams

• 2.0 grams

• 10.0 grams

• 13.0 grams

Tags

NGSS.HS-PS1-7

What is a positively charged ion?

• an atom

• an anion

• a cation

• an element

How many protons does the following have?

S^2-

• 18

• 16

• 14

• 12

How many electrons does the following have?

S^2-

• 18

• 16

• 14

• 12

Tags

NGSS.HS-PS1-1

In the following isotope, carbon-12, there are how many neutrons?

• 12

• 10

• 8

• 6

Tags

NGSS.HS-PS1-8

How many electrons does an argon atom have?

• 15

• 16

• 17

• 18

Tags

NGSS.HS-PS1-1

The "atomic mass" for an isotope comes from what two subatomic particles?

• protons and electrons

• electrons and neutrons

• protons and neutrons

Tags

NGSS.HS-PS1-8