Grade 8 revision

Question 1

is anything that has mass and takes up space.

Answer 1

matter

Question 2

the amount of matter in an object.

Answer 2

mass

Question 3

the gravitational force on an object.

Answer 3

weight

Question 4

a tool used to determine mass

Answer 4

triple beam balance

Question 5

a tool used to measure weight

Answer 5

spring scale

Question 6

the amount of space that an object

takes up, or occupies.

Answer 6

volume

Question 7

the amount of matter in a given volume.

Answer 7

Density

Question 8

is a measure of how well electric currents move

through a substance.

Answer 8

electric conductivity

Question 9

is the rate at which a substance transfers heat.

Answer 9

thermal conductivity

Question 10

the temperature at which it changes from a solid to a

liquid.

Answer 10

melting point

Question 11

the point at which the substance boils.

Answer 11

boiling point

Question 12

the ability of a substance to dissolve

in another substance.

Answer 12

solubility

Question 13

the ability of a substance to be

rolled or pounded into various shapes.

Answer 13

malleability

Question 14

describes the ability of a substance to

change into a new substance with different properties.

Answer 14

chemical property

Question 15

the ability of a substance to burn.

Answer 15

flammability

Question 16

the ability of a substance to interact
with another substance and form one or more new
substances.

Answer 16

reactivity

Question 17

The change in appearance, shape, or

size of a substance.

Answer 17

physical change

Question 18

the process by which one or more substances change into entirely new substances.

Answer 18

chemical change

Question 19

states that in ordinary chemical and
physical changes, mass is not created or
destroyed. It is only transformed into
different substances.

Answer 19

The law of conservation of mass

Question 20

first organized the
elements by arranging them in order
of increasing atomic mass.

Answer 20

Dmitri Mendeleev

Question 21

reorganized Mendeleev’s periodic
table in order of increasing number of protons, or
atomic number.

Answer 21

Henry Moseley

Question 22

an abbreviation for the element’s name.

Answer 22

chemical symbol

Question 23

the weighted average of the masses of all the naturally

occurring isotopes of that element.

Answer 23

average atomic mass

Question 24

elements that are shiny and conduct

heat and electricity well.

Answer 24

metals

Question 25

poor conductors of heat and electricity,

and are often dull and brittle.

Answer 25

non-metals

Question 26

elements that have some properties of

metals and non-metals. They border the zigzag line.

Answer 26

Metalloids

Question 27

elements placed below the

table to allow the table to be narrower.

Answer 27

lanthanides and actinides