Chapter One

Question 1

Pure Substance

Answer 1

Fixed ratio of atoms. Cannot be decomposed (elements, molecules, ionic compounds)

Question 2

Mixtures

Answer 2

No fixed ratio. Combination of pure substances, unfixed proportions. Can be separated (Homogenous, heterogenous)

Question 3

Elements

Answer 3

Pure substance, 1 type of atom

Question 4

Molecules

Answer 4

Non-metal atoms (H20, CH4)

Question 5

Ionic compounds

Answer 5

Metal & non-metal (NaCl) Pure substance

Question 6

Homogeneous mixtures

Answer 6

Uniform appearance (gas, sugar water, air)

Question 7

Heterogeneous mixture

Answer 7

If sample two places, different ratios (oil & water, pizza)

Question 8

Physical properties

Answer 8

Can be measured/observed without changing anything (shape, color, smell, boiling point)

Question 9

Chemical properties

Answer 9

A chemical change must occur

Question 10

Physical changes

Answer 10

Only changes physical properties, not chemical composition (melting, boiling, cutting)

Question 11

Chemical changes

Answer 11

Old substance destroyed, new substance formed (cooking, burning, rusting)

Question 12

Extensive property

Answer 12

Depends on how much matter is being considered (mass, volume)

Question 13

Intensive property

Answer 13

Does not depend on how much matter is being considered (density, temperature)

Question 14

Multiplying Sig Figs

Answer 14

Use smallest number

Question 15

Adding/Subtracting Sig Figs

Answer 15

Smallest decimal place

Question 16

Conversion within metric system

Answer 16

King Henry Died by Drinking Chocolate Milk Kilo Hecto Deka Deci Centi Milli

Question 17

Density, mass, volume

Answer 17

Density= m/V