What does the density of a substance mean?
Use data from the Data Booklet to explain why iron has a greater density than calcium.
Select the most appropriate heading to describe each of the following reactions by putting a tick (✓) in the correct column in the table below. Only one tick should be entered for each reaction.
A powdered sample of an alloy containing aluminium, titanium and vanadium is warmed with excess aqueous NaOH, and only the aluminium reacts according to the equation shown: $2\text{Al}(s) + 2\text{OH}^-(aq) + 6\text{H}_2\text{O}(l) \rightarrow 2[\text{Al}(\text{OH})_4]^-(aq) + 3\text{H}_2(g)$. If $100\,\text{g}$ of alloy is treated in this way, $8.0\,\text{dm}^3$ of hydrogen is collected under room conditions. Calculate the percentage by mass of aluminium in the alloy.
What type of reaction is each of the following? step 1; step 2.
Suggest reagents and conditions for step 1 and step 2.
Draw the structures of the intermediates $T$ and $W$ in the boxes above.