Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

Why does the reactivity of group 1 elements increase as you go down the group?

Group 1 metals all have one electron in their outer shell. When they react they form positive metal ions by losing this electron. Since there is only one electron to lose, group 1 metals are all extrememe...

Answered by Priyanka H. • Chemistry tutor

23708 Views

How do I calculate the relative formula mass of FeSO4 and the number of moles, when the formula mass of O=16, S=32, Fe=56 and the mass of FeSO4= 380g

The formula mass (Mr) of FeSO4 is the total mass of all the individual elemenets added together. So the Mr of FeSO4 = (1 x Fe) + (1 x S) + (4 x O) = 56 + 32 + 4x16 = 152 To calculate moles, the equation f...

Answered by Henry M. • Chemistry tutor

62313 Views

Balance this equation: Li(s) + H2O(l) → LiOH(aq) + H2(g)

2Li(s) + 3H2O(l) → 2LiOH(aq) + 2H2(g)

Answered by Fraser T. • Chemistry tutor

21913 Views

How does fractional distillation work?

Different length hydrocarbon chains are separated by their different boiling points as longer chains will have stronger intermolecular attractions. The crude oil is heated and injected into the base of th...

Answered by Bianca S. • Chemistry tutor

4358 Views