Key Definitions

Question 0

Compound

Answer 0

A compound is made up of two or more different elements chemically joined together in fixed ratio by mass

Question 1

Element

Answer 1

An element is a simple substance that cannot be broken down into a simpler substance by use of chemical means such as heat and electricity. It consists of only one type of atom. Examples can be found on the periodic table.

Question 2

Mixture

Answer 2

A mixture is made up of two or more elements or compounds which are physically joined together (as opposed to chemically bonded). They can be easily separated, using methods such as filtration, evaporation, chromatography and others

Question 3

Diffusion

Answer 3

Diffusion is the net movement of particles from areas of high concentration to areas of low concentration until a uniform concentration is achieved. It is brought about by the random movement of particles and it takes place independently of gravity.

Question 4

Atomicity

Answer 4

Number of atoms a molecule has

Question 5

Sublimation

Answer 5

Change of state from solid to gas directly, without becoming a liquid first, when a substance is heated

Question 6

Boiling point

Answer 6

Temperature at which liquid boils and turns from liquid to gas

Question 7

Condensation

Answer 7

When a gas is cooled below boiling point of the gas and so the gas liquefies

Question 8

Exothermic

Answer 8

Exothermic reaction releases heat

Question 9

Immiscible

Answer 9

Substances that don’t mix together

Question 10

Inflammable

Answer 10

Something that catches fire easily