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Question 1
The figure below describes reactions involving aqueous ammonia.
Name these substances.
- A ……[1]
- B…….[1]
- C…….[1]
- D…….[2]
- E…….[3]
Question 2
The huge external tank used during the launch of a space shuttle is made from a mixture of aluminium and lithium.
-
- What is the name given to a mixture of metals?……[1]
- What is it necessary to use a mixture of aluminium and lithium and not pure aluminium? Explain in terms of their structures……[2]
- The two boosters on each side of the tank are filled with solid fuel. This contains aluminium powder and a chemical that supplies oxygen.
- The reaction between aluminium powder and oxygen is exothermic. What does this mean?……[1]
- Suggest a reason why aluminium powder instead of chips is used……[1]
Question 3
Alkene P reacts with water to form propanol. Propanol is then reacted to form propanoic acid.
- Name the following:
- Alkene P……[1]
- Process A……[1]
- Name the chemical reagent used in Process A……[1]
- Calculate the percentage mass of carbon present in propanoic acid, C2H5COOH. (Ar of C:12, H:1 and O:16)……..[2]
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Answers
Question 1
- A ammonia……[1]
- B barium sulphate……[1]
- C iron(II) hydroxide…….[1]
- D iron(II) sulphate……[1]
- E ammonium chloride…….[1]
Question 2
-
- alloys -1mk……[1]
- Layers of pure aluminium atoms slide over each other easily -1mk
Atoms of one metal in alloy are of different size, disrupting the orderly arrangement– 1mk…….[2]
-
- Heat is given out – 1mk……[1]
- Aluminium powder has a larger surface area than aluminium chips -1mk……[1]
Question 3
-
- Propene……[1]
- Propanol…..[1]
- Acidified potassium dichromate(VI) or acidified potassium manganate(VII)…….[1]
- Mr of C2H5COOH = (212)+(51)+12+(216)+1=74 -1mk
% mass of C in C2H5COOH = =48.6% -1mk
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