Chemistry Part 1 Gr.9

Question 1

What is the 1st rule in the Particle Theory?

Answer 1

All matter is made up of tiny particles.

Question 2

What is the 2nd rule in the Particle Theory?

Answer 2

Every pure substance has its own type of particle.

Question 3

What is the 3rd rule in the Particle Theory?

Answer 3

Particles attract each other.

Question 4

What is the 4th rule in the Particle Theory?

Answer 4

Particles are always moving.

Question 5

What is the 5th rule in the Particle Theory?

Answer 5

Particles at a higher temperature move faster than particles at a lower temperature.

Question 6

List 3 examples of pure substances.

Answer 6

Oxygen (O₂)
Water (H₂O)
Copper (Cu)

Question 7

Which is gas, liquid, or solid?

Answer 7

1. Solid
2. Liquid
3. Gas

Question 8

Solid to liquid =

Answer 8

Melting.

Question 9

Solid to gas =

Answer 9

Sublimation.

Question 10

Liquid to solid =

Answer 10

Solidification.

Question 11

Liquid to gas =

Answer 11

Evaporation.

Question 12

Gas to solid =

Answer 12

Deposition.

Question 13

Gas to liquid =

Answer 13

Condensation.

Question 14

What are elements?

Answer 14

Elements are pure substances made up of only one type of atom. They cannot be broken down into simpler substances. They are all listed in the periodic table.

Question 15

What are compounds?

Answer 15

Compounds are pure substances formed when two or more different elements chemically combine.

Question 16

What is a pure substance?

Answer 16

A pure substance is made of only one type of particle (either an element or a compound), and it cannot be separated physically.

Question 17

What is a mixture?

Answer 17

A mixture is a combination of two or more substances (elements or compounds) that are physically combined, not chemically bonded.

Question 18

What is a Homogeneous Mixture?

Answer 18

A homogeneous mixture is a mixture where the substances are not visibly distinguishable from one another.

Question 19

List 3 examples of Homogeneous mixtures.

Answer 19

1. Salt water
2. Mouthwash
3. Vingear

Question 20

What is a Heterogeneous Mixture?

Answer 20

A heterogeneous mixture is a mixture where the different substances can be visibly distinguished or separated.

Question 21

List 3 examples of heterogeneous mixtures.

Answer 21

1. Trail mix
2. Oil and water
3. Salad

Question 22

List 3 examples of compounds.

Answer 22

1. Water (H₂O)
2. Sodium Chloride (NaCl)
3. Carbon Dioxide (CO²)

Question 23

List 3 examples of elements.

Answer 23

1.Copper (Cu)
2. Hydrogen (H)
3. Oxygen (O)

Question 24

What is matter?

Answer 24

Matter is anything that has mass or takes up space.

Question 25

What is a melting point?

Answer 25

Melting point is the temperature at which the solid starts to change its phase to liquid.

Question 26

What is a boiling point?

Answer 26

The temperature at which a liquid changes into a gas.

Question 27

What is odour?

Answer 27

A smell.

Question 28

What is texture?

Answer 28

The feel of a substance.

Question 29

What is viscosity?

Answer 29

A fluid’s resistance to a change in shape or movement.

Question 30

What is hardness?

Answer 30

The substance’s resistance to scratches.

Question 31

What is density?

Answer 31

The measurement of how tightly a material’s particles are packed together. It is measured by calculating Mass divided by Volume.

Question 32

What is malleability?

Answer 32

The ability to be hammered or pressed permanently out of shape without breaking or cracking.
Example: The ability to be hammered into thin sheets.

Question 33

What is ductility?

Answer 33

The quality of being flexible.
Example: The ability for copper to be stretched into a wire.

Question 34

What is conductivity?

Answer 34

The degree to which a material allows electricity or heat to flow through it.

Question 35

What is solubility?

Answer 35

The ability to be dissolved, especially in water.