CH-1687
Concentration and pressure
Chemistry · Secondary 4 · Medium · Concentration and pressure
A student reacts excess magnesium with 1.0 mol/dm³ hydrochloric acid and measures the time taken to collect 20 cm³ of hydrogen gas. Which change will DECREASE the time taken to collect 20 cm³ of gas, while keeping the total volume of gas produced the same?
- Use magnesium powder instead of larger pieces of magnesium.
- Use half the mass of magnesium while keeping acid the same.
- Use larger pieces of magnesium instead of magnesium powder.
- Carry out the reaction at a lower temperature.
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