Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Reactions of metals with dilute acids
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →Describe two observations you could make when magnesium is added to dilute hydrochloric acid that show it is more reactive than iron.
Question 2
4 marks · Normal
Answer and see the solution →An experiment was carried out to compare the reactivity of metals with dilute hydrochloric acid. The results are:
Observations when metals react with hydrochloric acid Metal Observation Magnesium Rapid fizzing, test-tube gets hot, gas burns with a squeaky pop Zinc Steady fizzing, test-tube gets warm, gas burns with a squeaky pop Copper No reaction, no temperature change, no gas produced (a)[1 mark]Arrange the metals in order of decreasing reactivity according to the observations.
(b)[1 mark]Write a word equation for the reaction between magnesium and hydrochloric acid.
(c)[2 marks]State the name of the gas produced in these reactions and describe how it is tested.
Question 3
3 marks · Normal
Answer and see the solution →A student wants to compare the temperature changes when 0.010 mol of three different metals react with 50 cm³ of 1 mol/dm³ hydrochloric acid. She uses 0.24 g magnesium, 0.65 g zinc, and 0.56 g iron. Her results are:
Temperature data Metal Initial temp / °C Max temp / °C magnesium 20 41 zinc 20 28 iron 20 24 Question 4
3 marks · Normal
Answer and see the solution →Explain why it is important to use the same number of moles of metal in each experiment when comparing their reactivity with dilute hydrochloric acid.
Question 5
4 marks · Normal
Answer and see the solution →The results of an experiment measuring the temperature rise when four metals react with excess hydrochloric acid are shown in the bar chart below.
Temperature rise for metals with hydrochloric acid (a)[1 mark]Which metal is the most reactive according to the results? Give evidence from the chart.
(b)[1 mark]Which metal does not react at all with hydrochloric acid?
(c)[2 marks]Describe the trend in reactivity shown by these four metals.
Question 6
1 mark · Normal
Answer and check →Which of the following metals will not react with dilute hydrochloric acid?
- A.Magnesium
- B.Zinc
- C.Iron
- D.Silver
Question 7
2 marks · Normal
Answer and see the solution →State two variables, apart from the type of metal, that must be controlled in an experiment comparing how quickly different metals react with dilute acid.
Question 8
4 marks · Normal
Answer and see the solution →A student observes the reaction between four different metals and dilute hydrochloric acid. She records the following results:
Metal Observation Calcium Rapid bubbling; white suspension forms; test-tube gets hot Iron Slow fizzing; pale green solution; little heat noticed Zinc Steady bubbles; colourless solution; test-tube gets warm Gold No reaction; no observable change (a)[2 marks]Which metal, from the table, is the most reactive? Explain your answer.
(b)[2 marks]Explain why gold does not react with dilute hydrochloric acid.