CIE Chemistry (US-0439): Specimen Questions with Answers 57 - 59 of 240

Question number: 57

Short Answer Question▾

Write in Short

  1. Describe a simple test-tube reaction which shows the effect of particle size on the rate at which a solid reacts with a solution.

[3 Marks]

Explanation

Action of HCl on solid sodium carbonate.

Take a small quantity of solid sodium carbonate in a test tube. Then add distilled water into it. Cork the test tube with a double bore cork and insert a thistle funnel into the test tube. Then place a beaker containing lime water near the test tube. Then insert one end of the delivery tube into the test tube and the other end into the beaker. Now add HCl into the test tube through the thistle funnel and observe the change in colour of the lime water. For examination use

Question number: 58

Short Answer Question▾

Write in Short

Malonic acid reacts with ethanol to form a colorless liquid which has a ‘fruity’ smell. Its structural formula is given below.

Image of ‘fruity’ smell

Image of ‘Fruity’ Smell

Image of ‘fruity’ smell

What type of compound contains the group which is circled?

[1 Marks]

Explanation

Carbonyl: A carbon-oxygen double bond. The carbon atom has two bonds left over that can be attached to other atoms.

Question number: 59

MCQ▾

Question

Under what conditions does Gay-Lussac’s Law stand?

Choices

Choice (4) Response

a.

Under constant pressure

b.

Under constant temperature and pressure

c.

Under constant temperature

d.

All of the above

Answer

b.

Explanation

Gay Lussac’s Law standsunder constant temperature and pressure.