Grade 9 describing matter

Question 1

Define property

Answer 1

A characteristic that describes matter

Question 2

Two categories that properties are grouped into

Answer 2

• chemical

- physical

Question 3

Define physical properties

Answer 3

A characteristic that describes matter when it is not changing into a new chemical substance

Question 4

Qualitative physical property: colour

Answer 4

it is black, white, gold, colourless, etc.

Question 5

Qualitative physical property: texture

Answer 5

it is fine, coarse, smooth, gritty, etc.

Question 6

Qualitative physical property: odour

Answer 6

It is odourless, spicy, sharp, burnt, etc.

Question 7

Qualitative physical property: lustre

Answer 7

(amount of light reflected )it has high lustre (lustrous) or it is not lustrous (dull)

Question 8

Qualitative physical property: clarity

Answer 8

(how see-through) It is transparent (clear) or translucent (only light passes through) or opaque (can’t see through at all)

Question 9

Qualitative physical property: taste

Answer 9

it is sweet, sour, salty, bitter, etc.

Question 10

Qualitative physical property: malleability

Answer 10

it can be bent/shaped or stretched (malleable), it is brittle, can’t be bent (not malleable)

Question 11

Qualitative physical property: state

Answer 11

it is a solid, liquid, gas

Question 12

Quantitative physical property: density

Answer 12

the ratio of mass to volume

Question 13

Quantitative physical property: hardness

Answer 13

is a measure of the resistance of a solid to being scratched or dented
-this can be recording using Moh’s scale

Question 14

Quantitative physical property: melting point

Answer 14

the temp. at which a solid melts

Question 15

Quantitative physical property: conductivity

Answer 15

a measure of a substance’s ability to transfer heat or electricity

Question 16

chemical property: combustibility

Answer 16

describes the ability of a substance to burn

Question 17

chemical property: light sensitivity

Answer 17

describes the effect light has on a substance. IF matter can interact with light to form new substances it is light sensitive.

Question 18

Quantitative physical property: viscosity

Answer 18

a measure of how easily a liquid flows: the thicker the liquid, the more viscous it is (this can only be used to describe a liquid)

Question 19

chemical property: reactivity

Answer 19

describes a substance’s ability to undergo a chemical reaction when in contact with another

Question 20

Common substances used to test reactivity

Answer 20

• reactivity with water
• reactivity with oxygen
• reactivity with acids
• reactivity with other pure substances

Question 21

chemical property: stability

Answer 21

the ability of a substance to remain unchanged

Question 22

chemical property: toxicity

Answer 22

the ability of a substance to cause harmful effects in plants and animals (living things)

Question 23

Physical change

Answer 23

• no new substance is made, the matter only changes form (same chemical formula)
• have different properties, but the chemical properties will not change

Question 24

Signs of a physical change

Answer 24

• usually reversible
• chemical properties unchanged
• physical properties unchanged
• known change of state

Question 25

Chemical change

Answer 25

• a new substance is formed (new chemical formula)

- particles are either broken apart, or different kinds of a particles are put together

Question 26

Signs of a chemical change

Answer 26

• often not reversible
• colour change
• new gas produced (bubbles or smoke)
• energy released in the form of heat light or sound without adding heat

Question 27

gas test

Answer 27

to test what kind of gas was produced (in a chemical change), a burning/glowing splint