Chemistry

Question 1

1Soap forms scum with hard water.

Easy

A. True B. False

Question 2

2The hydrolysis of an ester in dilute acid gives

Medium

A. an alkene B. an alkane C. an alkanoic acid and an alkanol D. a soap

Question 3

3Adding common salt to precipitate soap is called ___.

Medium

Your answer (fill in the blank)

Question 4

4Esters are used as

Easy

A. fuels for cars only B. fertilisers C. flavourings, perfumes and solvents D. bleaches

Question 5

5Oils differ from fats in that oils

Medium

A. are liquid at room temperature and are more unsaturated B. are solid at room temperature C. are saturated D. contain no carbon

Question 6

6Micelles form in a soap solution when

Hard

A. soap evaporates B. soap molecules cluster with tails inward and heads outward C. soap reacts with salt D. soap is heated strongly

Question 7

7The Ghanaian black soap, alata samina, is made using potash from

Medium

A. burnt plantain peels and cocoa pods B. limestone C. sea salt D. charcoal only

Question 8

8Common salt is added during soap making to

Medium

A. precipitate the soap out of solution (salting out) B. make it more alkaline C. speed up hydrolysis D. add colour

Question 9

9The alkaline hydrolysis of fats to make soap is called ___.

Easy

Your answer (fill in the blank)

Question 10

10The by-product of soap making is

Easy

A. glycerol (propane-1,2,3-triol) B. sodium chloride C. water only D. ethanol