Symbols, Formulae & Equations Flashcards
1
Q
What is a element
A
A substance that consists of one type of atom and cannot be broken down into anything simpler by chemical means
2
Q
What is a compound
A
A substance that consists of two or more elements chemically combined
3
Q
What is a diatomic molecule
A
Tow atoms covalently bonded in a molecule. Some elements only naturally exist as a diatomic molecule
4
Q
Diatomic elements
A
Hydrogen
Nitrogen
Oxygen
Fluorine
Chlorine
Bromine
Iodine
5
Q
What is a valency
A
The combining power of an atom or ion. The number of electrons a metal has to give away or a non metal has to gain to complete its outer shell
6
Q
Acid + metal =
A
Salt + hydrogen
7
Q
Acid + alkali =
A
Salt + water
8
Q
Acid + base =
A
Salt + water
9
Q
Acid + metal carbonate =
A
Salt + water + carbon dioxide
