Topic 3- Formulae And Equations

Question 1

What is a valency

What is the valency for group 1,2,3,4,5,6,7,0

Answer 1

The combining power of an element or an ion

1,2,3,4,3,2,1,none

Question 2

Work out the chemical formula of these compounds
Magnesium chloride 
Calcium oxide 
Iron(lll) chloride 
Calcium hydroxide 
Ammonia (N and H) 
Methane (C and H)

Answer 2

MgCl2
CaO
FeCl3
Ca(OH)2

Question 3

Remember how to do balanced symbol equations

Answer 3

Revise textbook will have questions

Watch out for hydroxides many errors happen