Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
231–240 of 374 · Normal
Question 231
6 marks · Normal
Answer and see the solution →Aluminium is an important metal that is mainly obtained from its ore using electrolysis. Aluminium alloys are used in many products because of their useful properties.
(a)[3 marks]Explain how aluminium is extracted from aluminium oxide using electrolysis. Include details of the role of cryolite and what happens at the electrodes.
(b)[1 mark]Define what an alloy is.
(c)[2 marks]Explain why alloys such as aluminium alloys are harder than pure aluminium.
Question 232
6 marks · Normal
Answer and see the solution →Aluminium and iron are both important industrial metals but are extracted by different methods. The table below gives some data about their extraction processes:
Data for Aluminium and Iron Extraction Metal Extraction Method Relative Energy Needed (arbitrary units per tonne metal) Aluminium Electrolysis of Al2O3 (in cryolite) 35 Iron Reduction of Fe2O3 in a blast furnace (with carbon) 6 (a)[2 marks]Use the data to calculate how many times more energy is needed to extract 1 tonne of aluminium by electrolysis than to extract 1 tonne of iron by reduction with carbon.
(b)[2 marks]Explain, in terms of the reactivity series, why aluminium is extracted by electrolysis and not by reduction with carbon like iron.
(c)[1 mark]Give one reason, based on its physical properties, why aluminium is used for electricity cables instead of iron.
(d)[1 mark]Aluminium is often alloyed for use in cables. Explain why alloys are used instead of pure metals for this purpose.
Question 233
6 marks · Normal
Answer and see the solution →Titanium is a metal above carbon in the reactivity series. Brass is an alloy of copper and zinc. Use your knowledge of methods of extraction and metals to answer the following questions.
(a)[2 marks]Describe how titanium can be extracted from its compound when it cannot be reduced by carbon.
(b)Brass is harder than pure copper.
(i)[1 mark]State what is meant by the term "alloy."
(ii)[3 marks]Explain why alloys such as brass are usually harder than pure metals.
Question 234
6 marks · Normal
Answer and see the solution →Aluminium is a widely used metal found above carbon in the reactivity series.
(a)[2 marks]Explain why aluminium cannot be extracted from its oxide by reacting it with carbon.
(b)[1 mark]State ONE important property of aluminium that makes it suitable for use in overhead electricity cables.
(c)[1 mark]Explain how this property benefits its use in the cables.
(d)[1 mark]Aluminium is usually used as an alloy for practical applications. Give ONE reason why pure aluminium is rarely used.
(e)[1 mark]Explain, in terms of atomic structure, why alloys of aluminium are harder than pure aluminium.
Question 235
2 marks · Normal
Answer and see the solution →State the colour change observed when litmus paper is placed in (a) an acidic solution and (b) an alkaline solution.
(a)[1 mark]Colour of litmus paper in an acidic solution:
(b)[1 mark]Colour of litmus paper in an alkaline solution:
Question 236
4 marks · Normal
Answer and see the solution →The table below shows the pH values of four different aqueous solutions.
Solution pH P 2 Q 5 R 8 S 13 (a)[1 mark]State which solution is strongly acidic.
(b)[1 mark]State which solution is neutral.
(c)[1 mark]State which solution is weakly alkaline.
(d)[1 mark]State which solution is strongly alkaline.
Question 237
3 marks · Normal
Answer and see the solution →A student adds methyl orange to a solution. The solution turns yellow. They mix the solution with just enough acid to make the colour just change to red.
Estimate the change in pH that the student has achieved. State your reasoning.
Question 238
3 marks · Normal
Answer and see the solution →Explain why a solution with pH 6 is described as weakly acidic and how you could confirm this using an indicator.
Question 239
4 marks · Normal
Answer and see the solution →The table shows the effect of three indicators in different solutions.
Solution Litmus Methyl orange Phenolphthalein Vinegar red red colourless Soapy water blue yellow pink (a)[2 marks]State which solution is acidic. Explain your answer using the indicator results.
(b)[2 marks]State which solution is alkaline. Explain your answer using the indicator results.
Question 240
1 mark · Normal
Answer and check →Which pH value shows a strongly alkaline solution?
- A.pH 2
- B.pH 6
- C.pH 9
- D.pH 13