matter definitions Flashcards
Acid
A solution with a pH value less than 7.
Alkali
A soluble base. A solution with a pH value greater than 7.
Alkali
Metals
Name for Group 1 of the periodic table. Highly reactive metals.
Base
A substance that neutralises an acid
Chemical
Property
How a substance behaves in its chemical reactions.
Density
How much mass there is per volume.
Density=Mass ÷ Volume
Displacement Reaction
In a displacement reaction a more reactive element displaces (or pushes out) a less reactive element from a compound.
Group
Column on the periodic table. Elements in same group have similar chemical properties.
Hologens
Name for Group 7 of the periodic table. Highly reactive non metals.
Metal
Elements on the left of the stepped-line of the periodic table. They are good conductors.
Metalloid
Elements near the stepped line of the periodic table. They show some properties of metals and some of non-metals.
Noble Gases
Name for Group 0 of the periodic table. Very unreactive gases.
Non-Metal
Elements on the right of the stepped-line of the periodic table. They are poor conductors.
Period
A row on the periodic table.
Physical
Property
A property of a material you can observe or measure. e.g. appearance, melting point, or conductivity.
