Chapter 1 - Matter and Energy

Question 1

Physical Change

Answer 1

The composition of matter does not change; Only the state changes. Ex: melting, boiling, freezing

Question 2

Chemical Change

Answer 2

The composition of matter changes. Ex: Burning

Question 3

Exothermic Process

Answer 3

Releases heat; Condensation, freezing, and deposition

Question 4

Endothermic Process

Answer 4

Absorbs heat; vaporization, melting, and sublimation

Question 5

Difference between a pure substance and a mixture.

Answer 5

Pure substance is an element or a compound. A mixture is either homogeneous (air) or heterogenous (choc. chip cookies)

Question 6

Physical Properties vs Chemical Properties

Answer 6

Physical: You can see it without changing the composition (ex: density)
Chemical: You have to change the chemical identity (ex: flammability)

Question 7

Extensive vs Intensive Properties

Answer 7

Extensive: Dependent on quantity (ex: mass)
Intensive: Independent on quantity (ex: boiling point)

Question 8

3 Types of Separation

Answer 8

Filtration, Distillation, Chromatography (TLC)

Question 9

Filtration

Answer 9

Separates solid-liquid mixture or solid-gas mixture

Question 10

Distillation

Answer 10

Separates liquid-liquid mixtures with different boiling points

Question 11

Chromatography (TLC)

Answer 11

separates liquid-liquid mixture of different solubilities in different medium

Question 12

Precision

Answer 12

How close the measurements are the other

Question 13

Accuracy

Answer 13

How close the measurements are to the true value

Question 14

Density

Answer 14

Intensive Property; D=m/v

Question 15

°F to °C

Answer 15

°C = (°F - 32) / 1.8

Question 16

°C to °F

Answer 16

°F = °C *1.8 + 32

Question 17

°C to K

Answer 17

K = °C + 273.15

Question 18

K to °C

Answer 18

°C = K - 273.15