Uddingston Grammar School

Nat.3/Nat.4 Chemistry

Unit 2 Sub-Topic c:

Everyday Consumer Products

NAT 3

1.  As well as carbohydrates, a bar of chocolate contains minerals, protein and fat.

The table shows the elements present in the minerals in a bar of

chocolate. The percentages of each element in the minerals is also shown.

(a)  Use the information in the table to:

• label and complete the scale on the vertical axis;

• draw a bar graph of the results. 3PS

(b)  The protein present in the bar of chocolate reacts with soda lime and a gas is given off.

What colour would the damp pH paper turn? 1KU

(c)  How would you show that chocolate also contains fat? 1KU

2.  Which test would give a positive result for starch ?

1KU

3.  Compounds must be soluble in water to be good fertilisers.

The table shows the effect of soil pH on the solubility of these compounds.

(a)  At what pH are all of the compounds soluble? 1PS

(b)  Which type of compound is insoluble at pH 3 – 5 ? 1PS

(c)  Why are fertilisers added to soil ? 1KU

4.  What is the name given to the process which changes sugar in to alcohol.

A combustion

B fermentation

C burning

D rusting 1KU

NAT4

5.  Which sugar will not be detected by the

Benedict’s test?

A Fructose

B Glucose

C Maltose

D Sucrose 1KU

6.  Fermentation of glucose to ethanol and

carbon dioxide by yeast stops when the ethanol

concentration reaches about 13%.

This is because

A the ethanol has destroyed the yeast

B all the glucose has been used up

C carbon dioxide is harmful to yeast

D the mixture is now saturated with 1KU

ethanol.

7. 

C6H12O6 C12H22O11

The above compounds are

A isomers

B hydrocarbons

C alkanols

D carbohydrates 1PS

8. Which of the following processes provides your body with energy ?

A Fermentation

B Photosynthesis

C Polymerisation 1KU

D Respiration

9.  A student compared the energy output from different fuels by using them to heat 100cm3 of water contained in a beaker. The temperature rise was determined after three minutes. The results are shown in the table.

Fuel / Temperature rise °C
Ethanol ( C2H5OH) / 22
Propanol (C3H7OH) / 26
Butanol (C4H9OH) / 28
Pentanol (C5H11OH) / 31

(a)  Draw a bar graph showing the information in the table.

(Use appropriate scales and fill most of the graph paper) 3PS proc

(b) What rise in temperature would you predict if hexanol was used as the fuel?

1PS predicting

10. Starch is broken down in the body by enzymes into simpler carbohydrate which is carried by the bloodstream to body cells.

(a)  Name the simpler carbohydrate formed. 1KU

(b) An enzyme in yeast catalyses the production of ethanol from carbohydrates.

Name the process of making ethanol from carbohydrates. 1KU