Formulae and equations Flashcards
1
Q
What is an element?
A
An element is a substance that cannot be split into simpler substances.
2
Q
What is an atom?
A
An atom is the smaller part of an element that can take part in chemical reactions.
3
Q
What is a molecule?
A
A molecule is two or more atoms chemically joined together
4
Q
What is a compound?
A
A compound is a substance that consists of atoms of different elements chemically joined together.
5
Q
What is a mixture?
A
A mixture contains different elements or compounds, but they are not chemically joined.
6
Q
What happens to atoms during a chemical reaction?
A
During a chemical reaction the atoms in the reactants are rearranged to make different products.
7
Q
List 4 gases which are diatomic
A
Hydrogen, oxygen, chlorine and nitrogen
