(a)[1]
Fill in the table to find the percentage of methane in Neptune’s atmosphere.
(b)[3]
Describe how Neptune’s atmosphere is different from Earth’s atmosphere. Give three differences.
(c)[2]
Complete the diagram to show how the electrons are arranged in a methane molecule, together with the symbols for the atoms present. Show only outer shell electrons.
(d(i))[1]
What is meant by isotopes?
(d(ii))[2]
Deduce how many protons and neutrons are in one atom of this hydrogen isotope. Refer to your Periodic Table if needed.
(e(i))[2]
Calculate the relative molecular mass of ethane, $\text{C}_2\text{H}_6$. Use your Periodic Table if needed.
(e(ii))[2]
Describe a chemical test for water. test [BLANK] outcome [BLANK]