(a)[3]
Describe how you could make a pure sample of hydrated cobalt(II) sulfate crystals using dilute sulfuric acid and an excess of cobalt(II) carbonate.
(b)[2]
Complete the table to work out the relative formula mass of anhydrous cobalt(II) sulfate, $\text{CoSO}_4$. Use your Periodic Table to assist you.
(c)[4]
Complete the table to show the numbers of electrons, protons and neutrons for the oxygen atom and cobalt ion shown.
(d)[2]
State the colour change that occurs when water is added to anhydrous cobalt(II) chloride. from [BLANK] to [BLANK]
(e(i))[1]
Which one of the following diagrams best shows the structure of the alloy? Draw a circle around the correct answer.
(e(ii))[1]
Which one of these substances is also used to make cutlery? mercury sodium stainless steel graphite