A student adds a 0.10 g piece of lithium, a 0.10 g piece of sodium and a 0.10 g piece of potassium separately to excess water. The hydrogen from each reaction is collected.
Relative atomic masses: Li = 7, Na = 23, K = 39
Which statement about the volumes of hydrogen collected is correct?
The volumes are equal, because the same mass of each metal is used
Lithium gives the greatest volume, because 0.10 g of lithium contains the most atoms
Potassium gives the greatest volume, because potassium is the most reactive
Potassium gives the greatest volume, because potassium has the largest ArA_{r}Ar
75 exam-style questions on Edexcel GCSE Chemistry 7.1 Group 1, covering 7.1.1 Classifying elements by group in the periodic table and 7.1.2 Properties and reactions of the alkali metals. Each one has a worked solution and a mark scheme showing where the marks go.