Download Yr9 Chem Terms def

Terms and their definitions used in Year 9 Chemistry
Terms
1 Atoms
2 Matter
Definitions
Particles too small to see which make up all matter
Term used to include anything which has mass and occupies
space
Pure substances made of only 1 type of atom
3 Elements
A tiny particle containing 2 or more atoms in a fixed ratio and
4 Molecules
joined by chemical bonds
5 Periodic Table A table of elements arranged in order of their atomic number
Pure substances which contain atoms of 2 or more different
6 Compound
elements in a fixed ratio and joined by chemical bonds
7 Pure substance Matter containing only 1 substance (either an element or
compound)
Gently pouring off a liquid leaving the solid in the container
8 Decanting
A way of separating a solid from a liquid using a filter
9 Filtering
Amount of matter in an object measured in kilograms or grams
10 Mass
A unit used to measure mass
11 Kilogram
Amount of space occupied by matter
12 Volume
Group of symbols and numbers indicating elements in a
13 Chemical
compound and the ratio of these elements
formula
A letter or letters that represent an element
14 Chemical
symbol
Characteristics or special features of materials eg. Strength,
15 Properties
colour or hardness
2 or more pure substances mixed together but not chemically
16 Mixtures
combined
Substance which dissolves in a solvent to form a solution
17 Solute
Substance which can dissolve another substance
18 Solvent
Liquid containing 1 or more solutes dissolved in a solvent eg.
19 Solution
Salt water
Able to dissolve
20 Soluble
A solution that has a small amount of solute dissolved in it
21 Dilute
22 Concentrated A solution that has a large amount of solute dissolved in it.
When 2 or more substances mix completely.
23 Dissolve
States of Matter
1 States of matter
2
3
4
5
6
7
Sublimation
Melting
Freezing
Condensation
Evaporation
Physical change
Solid, liquid and gas, a substance can exist in any of these 3
states
When a solid changes to a gas without forming a liquid first
A change of state from a solid to a liquid
A change of state from a liquid to a solid
A change of state from a gas to a liquid
A change of state from a liquid to a gas
Change where the properties of a substance change but the
substance is still the same