C3.1.4 - Chemical equations Flashcards
1
Q
What is a word equation?
A
A simple model for a chemical reaction which shows the Na,e of the reactants and products involved
2
Q
What is a balanced equation?
A
A model for a reaction showing formulae and number of units for all substances involved. The numbers of each atoms are the same on both sides
3
Q
Balanced the equation: Na + O2 -> Na2O
A
4Na + O2 -> 2Na2O
4
Q
What are state symbols?
A
They show the physical state of each substances in a chemical reaction
5
Q
What does (s) mean?
A
Solid
6
Q
What does (l) mean?
A
Liquid
7
Q
What does (g) mean?
A
Gas
8
Q
What does (aq) mean?
A
Aqueous solution
9
Q
Balance the equation: Fe + Cl2 -> FeCl3
A
2Fe + 3Cl2 -> 2FeCl3
10
Q
Balance the equation: Ca + H2O -> Ca(OH)2 + H2
A
Ca + 2H2O -> Ca(OH)2 + H2
11
Q
Balance the equation: C2H5OH + O2 -> CO2 + H20
A
C2H5OH + 3O2 -> 2CO2 + 3H2O
