Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

Give an advantage of hard water.

Hard water tastes better.

Answered by Angus B. • Chemistry tutor

1583 Views

You have 10g of Sodium Carbonate, how many moles do I have to 2dp?

Sodium Carbonate is Na₂CO₃The molecular formula mass is 2xNa + 1xC + 3xO 2x23 + 1x12 + 3x16 = 106 g/mol m = 10g Mr = 106 g/moln=m/Mrn = 10/106 = 0.09 mol

Answered by Sophie B. • Chemistry tutor

3223 Views

What is an atom?

Atoms are the smallest particle of matter that cannot be divided and have a nucleus which contains protons and neutrons with electrons surrounding it in energy levels.

Answered by Shazna B. • Chemistry tutor

1997 Views

Describe what happens to sodium and chlorine in a reaction to make Sodium cholride, you may use diagrams to help you.

As Sodium is a metal and Chlorine is a non-metal they will undergo an ionic reaction in which Sodium will lose an electron and donate it to the Chlorine atom which will gain an electron. This will create ...

Answered by Gurpreet S. • Chemistry tutor

2300 Views

An industrial process converts the alkene ethene into ethanol, according to the following reaction: C2H4 + H2O --> CH3CH20H. What mass of ethanol can be made from 53g of ethane, given that the water is in excess. (2 marks) (6-7 grade)

This question is all about using the mols equation question (mols = mass/molecular weight).
It's best to break it down into steps:
1) calculate the molecular masses of the compounds that are in...

Answered by Charlie S. • Chemistry tutor

8042 Views