Brass is an alloy made from copper and zinc. It is less malleable than both copper and zinc. Explain, using the structure of metals, why brass is less malleable than either copper or zinc. You may add a labelled diagram to support your answer.
The table gives the behaviour of four metals with cold water and with steam. Arrange the four metals in order of increasing reactivity.
The complete symbol for an ion of mercury is $^{199}_{80}\text{Hg}^{2+}$. Determine how many electrons and neutrons are present in this ion.
The formula for chromium(III) sulfate crystals is $\text{Cr}_2(\text{SO}_4)_3\cdot18\text{H}_2\text{O}$. State the term used for the water present in $\text{Cr}_2(\text{SO}_4)_3\cdot18\text{H}_2\text{O}$.
Aqueous bromine is added to aqueous potassium iodide. The products are aqueous iodine and aqueous potassium bromide. Write the ionic equation, with state symbols, for this reaction.
Explain, in terms of halogen reactivity, why aqueous iodine does not react with aqueous potassium bromide.