10 Nov Are you able to answer this Chemistry Tuition Question?

Evaluate your Chemistry skills by trying to solve these questions from the best chemistry teachers of Singapore. Join Miracle Learning Centre, your final destination for A level chemistry tuition, O level chemistry tuition and JC chemistry tuition. We always look forward to helping you out with all of your problems.

Question 1

The figure below describes reactions involving aqueous ammonia.

Name these substances.

1. A ……[1]
2. B…….[1]
3. C…….[1]
4. D…….[2]
5. 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.

1. 1. What is the name given to a mixture of metals?……[1]
   2. What is it necessary to use a mixture of aluminium and lithium and not pure aluminium? Explain in terms of their structures……[2]
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.
   1. The reaction between aluminium powder and oxygen is exothermic. What does this mean?……[1]
   2. 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.

1. Name the following:
   1. Alkene P……[1]
   2. Process A……[1]
2. Name the chemical reagent used in Process A……[1]
3. Calculate the percentage mass of carbon present in propanoic acid, C2H5COOH. (Ar of C:12, H:1 and O:16)……..[2]

Miracle Learning Centre (O Level Chemistry Tuition/ IP Chemistry Tuition)
Did you answer the Chemistry Tuition Question correctly?

Answers

Question 1

1. A ammonia……[1]
2. B barium sulphate……[1]
3. C iron(II) hydroxide…….[1]
4. D iron(II) sulphate……[1]
5. E ammonium chloride…….[1]

Question 2

1. 1. alloys -1mk……[1]
   2. 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]
2. 1. Heat is given out – 1mk……[1]
   2. Aluminium powder has a larger surface area than aluminium chips -1mk……[1]

Question 3

1. 1. Propene……[1]
   2. Propanol…..[1]
2. Acidified potassium dichromate(VI) or acidified potassium manganate(VII)…….[1]
3. Mr of C2H5COOH = (212)+(51)+12+(216)+1=74 -1mk
   % mass of C in C2H5COOH = =48.6% -1mk

Learn from our Chemistry Tuition Question and Answer.

Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908.

(Specialist in Science and Maths) for Primary, Secondary and JC levels.

Miracle Learning Centre specialises in Physics tuition, Chemistry tuition, Maths tuition and Science tuition Classes.

By joining Miracle Learning Centre, be assured to witness noticeable progress in your grades within a very short span of time.
Contact us for more details.