c1.1.1 particle model revision

Question 1

What is the particle model?

Answer 1

The particle model is a scientific theory that describes the arrangement and movement of particles in a substance.

Question 2

True or False: According to the particle model, particles are constantly moving.

Answer 2

True

Question 3

Fill in the blank: In a solid, particles are packed ______ together.

Answer 3

closely

Question 4

What happens to the arrangement of particles in a substance when it changes from a solid to a liquid?

Answer 4

Particles move further apart

Question 5

What is the process called when a liquid changes to a gas?

Answer 5

Evaporation

Question 6

What is the term for the process when a gas changes back into a liquid?

Answer 6

Condensation

Question 7

What is the term for the process when a solid changes directly into a gas without becoming a liquid first?

Answer 7

Sublimation

Question 8

What does the term ‘diffusion’ refer to in the context of the particle model?

Answer 8

The movement of particles from an area of high concentration to an area of low concentration

Question 9

What is the formula for calculating density?

Answer 9

Density = mass/volume

Question 10

Fill in the blank: The higher the temperature of a substance, the ______ the particles move.

Answer 10

faster

Question 11

What is the term for the smallest particle of an element?

Answer 11

Atom

Question 12

What is the term for two or more atoms chemically bonded together?

Answer 12

Molecule

Question 13

True or False: In a gas, particles are tightly packed together.

Answer 13

False

Question 14

What is the term for the process when a liquid changes to a solid?

Answer 14

Freezing

Question 15

What is the term for the process when a gas changes to a liquid?

Answer 15

Condensation

Question 16

What is the term for the process when a liquid changes to a gas?

Answer 16

Evaporation

Question 17

Fill in the blank: In a liquid, particles are ______ packed together than in a solid.

Answer 17

less

Question 18

Fill in the blank: The lower the temperature of a substance, the ______ the particles move.

Answer 18

slower

Question 19

What is the term for the process when a solid changes to a liquid?

Answer 19

Melting

Question 20

what is a chemical change?

Answer 20

chemical transformation from one chemical substance to another

Question 21

what is a physical change?

Answer 21

changes affecting the form of a chemical substance, not its composition

Question 22

is rusting a chemical or physical change?

Answer 22

chemical change

Question 23

is dissolving table salt in water a chemical or physical change

Answer 23

physical

Question 24

is a beaker breaking a chemical or physical change

Answer 24

physical

Question 25

is burning charcoal a chemical or physical change

Answer 25

chemical