Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

A compound is found to contain 37.21% carbon, 7.75% hydrogen and 55.04% chlorine. What is it's empirical formula?

Carbon: 37.21/12= 3.1Hydrogen:7.75/1=7.75Chlorine: 55.04/35.5=1.55Ratio:c:H:Cl3.1:7.75:1.552:5:1Therefore empirical formula= C₂H₅Cl

Answered by Lucy P. • Chemistry tutor

6508 Views

What is the Haber process? What are the optimal conditions for the reaction and why are they not used in practice?

The Haber process is a reaction of burning Nitrogen and Hydrogen to make NH3.The formula is 2N2 + 3H2 - 2 NH3. The reaction is reversible.The forward reaction is exothermic so when the temperature is incr...

Answered by Iona M. • Chemistry tutor

3124 Views

Describe three possible structures of the allotropes of carbon

1.Graphite is made up of multiple flat layers of carbon, where the layers are not covalently bonded together. Three covalent bonds hold the atoms in each layer together, forming a repeating hexagonal ring...

Answered by James C. • Chemistry tutor

2360 Views

Predict the products of electrolysis of molten calcium chloride and explain which ions are at each electrode

Electrolysis is a process in which electrical energy, from a direct current (dc) supply, breaks down electrolytes. the free moving ions in electrolytes are attracted to t...

Answered by Yasmeen M. • Chemistry tutor

15070 Views

Explain in terms of particles and collisions how concentration, temperature and addition of a catalyst affect the rate of a reaction.

Concentration: the higher the concentration, the more particles in the same volume. The increase in particle numbers causes an increase in particle collisions, so the rate of reaction increases.Temperatur...

Answered by Emily W. • Chemistry tutor

9627 Views