Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

A sodium hydroxide solution is made by dissolving 3.5 g of sodium hydroxide with 500 cm^3 of water. What is the concentration of the solution in g dm^-1?

3.5 g of sodium500 cm³ of water is 0.5 dm³3.5 / 0.5 = 7 g dm^-3

2117 Views

Why can metals conduct electricty?

This is because of the special type of bonding that occurs in metals. A metal is a giant structure of regularly arranged atoms, the outermost electrons ( check they understand the differences between the ...

Answered by Alicia E. • Chemistry tutor

2055 Views

Name three types of chemical bonding in atoms.

First we have covalent where electrons are shared between two atoms.
then we have ionic where one one atom transfers their electron to another atom. These oppositely charge ions forms a strong electr...

Answered by Hanifah M. • Chemistry tutor

2036 Views

What techniques would you use to separate: 1) different colour inks from black ink. 2) ethanol from ethanol and water 3) salt from water

You would use chromatography, the different colours have different affinities depending on the solvent you use. So different colours will travel longer than other on your chromatogram (support).2) Y...

Answered by • Chemistry tutor

4737 Views

Using a reaction as an example, explain why bromine is more reactive than iodine in terms of electrons.

bromine + sodium iodide --> sodium bromide + iodineBr₂ + 2NaI --> 2NaBr + I₂ Both bromine and iodine atoms have 7 electrons in their outer shells, a full shell contains 8 elect...

Answered by Vasudha S. • Chemistry tutor

22888 Views