Unit 1 - Explaining Physical Changes 1

Question 1

Particles

Answer 1

The smallest pieces of matter

Question 2

Intermolecular forces

Answer 2

The forces between particles in matter

Question 3

Malleable

Answer 3

Able to be bent without breaking

Question 4

Strength

Answer 4

The ability of a solid to withstand a force

Question 5

Hardness

Answer 5

A measure of how easy it is to scratch a solid

Question 6

Soluble

Answer 6

Able to dissolve in a solvent

Question 7

Conduct

Answer 7

Transfer of heat or electrical charge by passing on energy to nearby particles

Question 8

Alloy

Answer 8

Mixtures of metals

Question 9

Hypothesis

Answer 9

An idea that explains facts or observations and is the basis for experimentation (X depends on Y)

Question 10

Brownian motion

Answer 10

Movement of solid particles caused by collisions with liquid particles

Question 11

Kinetic theory

Answer 11

Theory that all matter is made up of particles

Question 12

Evidence

Answer 12

Information gathered in a scientific way which supports or contradicts a conclusion

Question 13

Viscosity

Answer 13

The ability of liquids and gases to flow

Question 14

Compressed

Answer 14

When particles are squashed together by a force

Question 15

Solubility

Answer 15

The mass of solute that dissolves in a solvent at a particular temperature

Question 16

Sublimation

Answer 16

When a solid turns straight into a gas without a liquid state

Question 17

Melting point

Answer 17

The temperature at which a solid changes state to a liquid

Question 18

Boiling point

Answer 18

The temperature at which liquid changes state to a gas

Question 19

Latent heat

Answer 19

The heat energy needed to change the state of a substance

Question 20

Evaporation

Answer 20

Change from a liquid to a gas a t the surface of a liquid

Question 21

Boiling

Answer 21

When a liquid changes state into a gas

Question 22

Surface area

Answer 22

The area of the outside surface of an object

Question 23

Thermal expansion

Answer 23

When particles in a solid or a liquid gain enough energy to occupy more space

Question 24

Atom

Answer 24

The basic building block of an element that cannot be chemically broken down

Question 25

Element

Answer 25

A substance made up of only one type of atom

Question 26

Compound

Answer 26

Two or more elements that are chemically joined together such as water (Hydrogen + Oxygen)

Question 27

Particle model

Answer 27

Used to explain the kinetic theory of solids, liquids and gases