Grade 9 Science Exam Review (Chemistry Unit)

Front 1

particle theory of matter

Back 1

theory stating that all matter is
composed of very tiny objects called particles; that all particles
have spaces between them; that particles of matter are always
in motion; that particles in a substance attract each other

Front 2

matter

Back 2

anything that has mass and volume

Front 3

2 different types of matter

Back 3

- pure substances
- mixtures

Front 4

element

Back 4

pure substance that cannot be broken down into a
simpler substance

Front 5

compound

Back 5

pure substance made from two or more elements
that are combined together chemically

Front 6

solution

Back 6

- combination of pure substances in which the
different substances are not individually visible
- a homogeneous mixture

Front 7

mechanical mixture

Back 7

- combination of pure substances in which
the different substances are individually visible
- heterogeneous mixture

Front 8

Ductility

Back 8

Any solid that can be stretched into a long wire is said to be ductile

Front 9

Colour and Lustre

Back 9

the light a substance reflects gives it colour and lustre (shine)

Front 10

conductivity

Back 10

The ability of a substance to conduct electricity or heat.

Front 11

Density

Back 11

The amount of mass in a given volume of a substance

Front 12

Hardness

Back 12

A substance's ability to resist being scratched.
(Usually measured on the Mohs scale)

Front 13

Malleability

Back 13

A substance that can be pounded or rolled into sheets .

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Viscosity

Back 14

The resistance to flow

Front 15

Cohesion

Back 15

Sticks to itself

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Adhesion

Back 16

Sticks to other substances

Front 17

Physical Property

Back 17

Describes a characteristic of a substance that can be observed or measured.
(Melting point)

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proton

Back 18

- positively charged particle in an atom
- found in the nucleus

Front 19

pure substance

Back 19

- one kind of matter with a unique set of
properties, such as colour, hardness, boiling point, and melting point;
- an element or compound

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atom

Back 20

smallest part of an element that has all of the element’s
properties

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molecule

Back 21

group of atoms that share electrons; molecular
compounds contain molecules

Front 22

molecular compound

Back 22

pure substance that is formed when non-metals combine chemically

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ion

Back 23

atom or group of atoms that has lost or gained electrons

Front 24

ionic compound

Back 24

pure substance consisting of at least one metal and one non-metal

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chemical property

Back 25

- ability of a substance to change into a new substance or substances;
- e.g., how a substance interacts with other substances, such as acids, or how it reacts to heat or light

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electron

Back 26

- negatively charged particle in an atom; located
outside the nucleus of the atom

Front 27

valence electron

Back 27

electron in the valence shell of an atom

Front 28

neutron

Back 28

- particle that has no electric charge so is neutral;
- located in the nucleus of the atom

Front 29

mixture

Back 29

- a combination of pure substances
- substances in a mixture do not combine chemically like when a compound forms

Front 30

alloy

Back 30

A mixture of two or more metals
- e.g. white gold