green and pink basic info booklets Flashcards
1
Q
Molecule
A
small number of atoms COVALENTLY bonded together
2
Q
Compound
A
2 or more different types of atom chemically bonded together
3
Q
mixture
A
2 or more substances NOT chemically bonded
4
Q
ion
A
atom or group of atoms that has gained or lost electrons
5
Q
element
A
substance which contains only 1 type of atom
6
Q
acid + base ~>
A
salt + water
7
Q
acid + carbonate ->
A
salt + water + carbon dioxide
8
Q
very reactive metal + water ~>
A
metal hydroxide + hydrogen
9
Q
reactive metal + acid ~>
A
metal salt + hydrogen
10
Q
what is group 1 known as
A
alkali metals
11
Q
what is group 2 known as
A
alkaline earth metals
12
Q
transition metals properties (7)
A
- form several positively charged ions
- form colourful compounds
-they are good conductors of heat and electricity.
-they can be hammered or bent into shape easily.
-they have high melting points (but mercury is a liquid at room temperature)
-they are usually hard and tough.
-they have high densities.
13
Q
what is group 7 known as
A
halogens
14
Q
what is group 8 known as
A
noble gases
15
Q
diatomic molecule
A
only composed of 2 atoms of the same or different chemical elements
