Chapter 2 and 3

Question 1

Vocab: element

Answer 1

Cannot be broken into different substances

Question 2

Vocab: atom

Answer 2

Smallest unit of an element broken down into different substances

Question 3

Vocab: compound

Answer 3

A substance made up of 2 or more different elements that chemically combine

Question 4

Vocab: molecule

Answer 4

Smallest unit of a substance that keeps all physical and chemical properties of a substance

Question 5

Vocab: mixture

Answer 5

A mix of many pure substances

Question 6

Vocab: Heterogeneous

Answer 6

Substances are mixed uniformly

Question 7

Vocab: Homogeneous

Answer 7

Same through out

Question 8

Vocab: energy

Answer 8

The capacity to do work

Question 9

Vocab: temperature

Answer 9

A measure of average kinetic energy

Question 10

Vocab: Thermal energy

Answer 10

The kinetic energy (KE) of a substances atom

Question 11

Vocab: Conservation of mass

Answer 11

Mass cannot be created or destroyed

Question 12

Vocab: conservation of energy

Answer 12

Energy cannot be created or destroyed

Question 13

Vocab: Melting

Answer 13

Change of a substance from a solid to a liquid

Question 14

Vocab: Freezing

Answer 14

A change of a substance from a livid to a solid

Question 15

Vocab: evaporation

Answer 15

Change of a substance from a liquid to a gas

Question 16

Vocab: Sublimation

Answer 16

Solid turns directly to a gas

Question 17

Vocab: Condensation

Answer 17

Change of a substance from a gas to liquid

Question 18

4 indications of a chemical change

Answer 18

1. ) heat and light
2. ) new gas
3. ) color change
4. ) new solid

Question 19

List 3 main points of the kinetic theory of matter

Answer 19

1. ) all matter is made of atoms and molecules that act like tiny particles
2. ) these tiny particles are always in motion
3. ) at the same temperature, more massive (heavier) particles move slower than less massive (lighter) particles

Question 20

List the 4 states of matter

Answer 20

Solid, liquid, gas, plasma

Question 21

State whether energy is released or energy is required for the following changes to take place: melting, sublimation, evaporation, condensation

Answer 21

Melting: released
Sublimation: released
Evaporation: released
Condensation: required

Question 22

Describe the shape and volume for each of the following: solid, liquid, gas

Answer 22

Solid: definite, definite
Liquid: not definite, definite
Gas: not definite, not definite

Question 23

Full in the blank: ____________is a measure of average kinetic energy

Answer 23

Temperature

Question 24

State the law of conservation of mass

Answer 24

Mass cannot be created or destroyed

Question 25

Vocab: matter

Answer 25

Anything that has made and occupies space