Top answers

How do you work out the oxidation number of a atom in a compound?

To work out an oxidation state of an atom you need to assign the electrons on the atoms outer shell to the most electronegative atom.O>N>C>H. Electrons in the outer shell of two of the same atoms ar...
CH
Answered by Charles H. • Chemistry tutor
2121 Views

Explain what metallic bonding is.

There is a structure of positively charged metal ions arranged in a regular pattern. Between these metal ions lie a sea of delocalised electrons which have been delocalised from the metal atoms to form the m...
LB
Answered by Louisa B. • Chemistry tutor
2200 Views

Calculate the relative formula mass of water.

The chemical formula for water is H 2 O, and this means it contains 2 hydrogen atoms and 1 oxygen atom. If you then look at the periodic table and find the relative atomic mass for each element you find that...
CR
31373 Views

Explain briefly the separation technique of fractional distillation, with reference to a particular example.

Fractional distillation is used to separate crude oil into its constituent fractions (e.g. petrol, naphtha etc. - names not required)Crude oil is heated to a high temperature and most is vaporised/evaporated...
MH
Answered by Max H. • Chemistry tutor
3622 Views

Potassium forms an ionic compound with sulfur. Describe what happens when two atoms of potassium react with one atom of sulfur. Give your answer in terms of electron transfer.

Electrons are transferred from potassium to sulfur. 2 potassium atoms each lose one electron forming K+ / 1+ ionsSulfur atoms gain 2 electrons forming S2- / 2- ions. This results in the ionic formula K 2 S
MB
Answered by Mariam B. • Chemistry tutor
2498 Views