All Saints SecondaryStandard Grade Chemistry

Topic 15 Homework – Carbohydrates

(General Level)

1.The grid contains the names of some processes.

A / B / C
respiration / cracking / distillation
D / E / F
filtration / photosynthesis / galvanising

(a)Identify the process which produces water and carbon dioxide.

1 mark (KU)

(b)Identify the process which can be used to separate alcohol and water.

1 mark (KU)

2.The grid contains the names of some chemical processes.

A / B / C
respiration / photosynthesis / distillation
D / E / F
electroplating / galvanising / cracking

(a)Identify the process that uses light energy.

1 mark (KU)

(b)Identify the process that can be used to separate alcohol and water.

1 mark (KU)

3.Various reagents can be used to identify substances.

A / Benedict's solution
B / bromine solution
C / ferroxyl indicator
D / iodine solution
E / lime water

(a)Identify the reagent used to test for starch.

1 mark (KU)

(b)Identify the reagent used to test for glucose.

1 mark (KU)

(c)Identify the reagent used to test for an unsaturated hydrocarbon.

1 mark (KU)

4.The atmosphere contains many gases.

A / B
argon / carbon dioxide
C / D
helium / nitrogen
E / F
nitrogen dioxide / oxygen

(a)Identify the gas which makes up 80% of the atmosphere.

1 mark (KU)

(b)Identify the gas which is produced during lightning storms.

1 mark (KU)

(c)Identify the gas which is produced during photosynthesis.

1 mark (KU)

5.Many processes are used in the chemical industry.

A / distillation of crude oil
B / cracking of oil fractions
C / fermentation of glucose
D / combustion of methane
E / polymerisation of ethene

(a)Identify the process which is used to make alcohol.

1 mark (KU)

(b)Identify the process which is used to make a plastic.

1 mark (KU)

(c)Identify the process which is not a chemical reaction.

1 mark (PS)

6.Alcoholic drinks contain different percentages of alcohol.

Beers contain 5% but some ciders are stronger at 7-5%. Red wine contains 12%, but fortified wines contain 18%. Whisky is much stronger at 40%0 alcohol.

(a)Present the above information in a table with suitable headings.

2 marks (PS)

(b)All alcoholic drinks are made using the same process:

glucosealcohol + carbon dioxide

(i)What type of substance, found in yeast, acts as a catalyst for the reaction?

1 mark (KU)

(ii)What is the correct chemical name for the alcohol found in alcoholic drinks?

1 mark (KU)

(iii)State the test for carbon dioxide.

1 mark (KU)

7.Bees collect nectar from flowers to make honey. The nectar contains sucrose which is broken down in the bees' bodies to give glucose and fructose.

(a)Name the family of compounds to which glucose and fructose belong.

1 mark (KU)

(b)Name the type of substance in the bees' bodies which can break down sucrose.

1 mark (PS)

(c)Describe the test you would use to show that honey contains glucose.

2 marks (KU)

8.The bar chart shows the boiling points of some alcohols.

(a)Describe the relationship between the number of carbon atoms and the boiling point.

1 mark (PS)

(b)Predict the boiling point of the alcohol with five carbon atoms per molecule.

1 mark (PS)

9.This diagram shows the main stages in the making of malt vinegar.

(a)(i) In the mashing process, some of the starch is broken down to glucose. Starch and glucose are carbohydrates.

Name the elements present in a carbohydrate.

1 mark (KU)

(ii) Describe how you could test the mash to show it still contained some starch.

1 mark (KU)

(b) What name is given to Process X?

1 mark (KU)

10.Starch and glucose are carbohydrates.

(a)Which chemical would you use to test for starch?

1 mark (KU)

(b)What is the chemical name for the alcohol produced by the fermentation of glucose?

1 mark (KU)

(c)The percentage of alcohol in a wine depends on the temperature of the fermentation process. Some results are shown on the graph.

(i)Describe how the temperature of fermentation affects the % alcohol produced.

1 mark (PS)

(ii)Use the graph to estimate the % alcohol when the temperature is 37 °C.

1 mark (PS)

11.During photosynthesis green plants produce oxygen.

(a)Name the substance in green plants which absorbs light during photosynthesis.

1 mark (KU)

(b)A pupil set up the apparatus shown to investigate the rate of photosynthesis. Oxygen gas produced by the plant was collected in the test tube.

Distance of lamp from
plant/cm / Number of bubbles of oxygen
gas produced in one minute
30 / 24
40 / 19
60 / 10
100 / 4

(i)What effect does the distance of the lamp from the plant have on the number of bubbles of oxygen gas produced?

1 mark (PS)

(ii)Give one factor that needs to be kept the same to make this experiment fair.

1 mark (PS)

(c)During photosynthesis glucose is also produced.

Name the process used to convert glucose to alcohol.

1 mark (KU)

Credit Level

1.Glucose, sucrose and starch are all carbohydrates.

Identify the correct statement(s).

A / Glucose and sucrose are isomers of each other.
B / Starch formed by glucose molecules joining together is polymerisation
C / Sucrose can be hydrolysed to give starch.
D / When sucrose is heated with dilute acid, glucose is formed.
E / Glucose is formed from carbon dioxide and water during respiration
F / Glucose is an example of a disaccharide.

1 mark (KU)

2.Glucose, sucrose and starch are carbohydrates.

Identify the two correct statements.

A / Glucose molecules join together with the loss of water
B / Starch is a polymer made from sucrose molecules.
C / Sucrose turns warm Benedict's solution orange.
D / Glucose is an isomer of sucrose.
E / Starch dissolves easily in water.
F / Sucrose can be hydrolysed

2 marks (KU)

3.The names of some carbohydrates are shown.

A / glucose
B / fructose
C / maltose
D / sucrose
E / starch

(a)Identify the carbohydrate which does not dissolve well in water.

1 mark (KU)

(b)Identify the two carbohydrates which are disaccharides.

1 mark (KU)

4.Carbohydrates are formed in plants.

A / glucose
B / maltose
C / sucrose
D / starch
E / fructose

(a)Identify the two carbohydrates with formula C12H22O11.

1 mark (KU)

(b)Identify the carbohydrate which does not react with either iodine solution or Benedict's solution.

1 mark (KU)

5.The chemical processes in the grid involve catalysts.

A / Haber Process
B / Ostwald Process
C / Hydrolysis of starch
D / Cracking of hydrocarbons
E / Formation of alkanes from alkenes

(a)Identify the process in which the catalyst can be an enzyme.

1 mark (KU)

(b)Identify the process(es) in which hydrogen gas is a reactant.

1 mark (KU)

6.There are many different chemical reactions.

A / B / C
i
addition / cracking / displacement
D / E / F
I
neutralisation / polymerisation / precipitation

(a)Identify the reaction which produces starch from glucose.

1 mark (KU)

(b)Identify the type(s) of reaction represented by the following equation. Ba(OH)2(aq) + H2SO4(aq) BaSO4(s) + 2H20(l)

1 mark (KU)

7.There are different types of chemical reaction.

A / B / C
displacement / hydrolysis / fermentation
D / E / F
condensation / addition / redox

Identify the type of reaction that occurs when glucose molecules join to form starch.

1 mark (KU)

8.Glucose and starch are both carbohydrates.

(a)Write the molecular formula for glucose.

1 mark (KU)

(b)A pupil set up the following experiment to turn starch into glucose.

(i)Name the type of chemical reaction which takes place when starch is broken down to glucose.

1 mark (KU)

(ii)Suggest why glucose would not be formed in test tube A.

1 mark (PS)

9.(a) Ailsa carried out the experiment shown below.

(i)What type of chemical reaction takes place when starch is heated with hydrochloric acid?

1 mark (KU)

(ii)Ailsa said that the starch had turned into glucose.

Name another sugar which turns Benedict's solution red/orange.

1 mark (KU)

(iii)Ailsa repeated her experiment using amylase solution instead of hydrochloric acid.

Suggest a reason whythe Benedict's solution did not turn red/orange.

1 mark (PS)

(b) Write the molecular formula for glucose.

1 mark (KU)

10.Using all the chemicals and apparatus below describe the experiment you would carry out to show that hydrolysed starch can pass through the visking tubing. (You may wish to draw a diagram.)

You may use other apparatus if required.

2 marks (PS)

11.The flow diagram shows what happens to starchy foods after they have been eaten.

(a)Name an isomer of glucose.

1 mark (KU)

(b)What type of substance, present in the digestive system, speeds up the breakdown of starchy foods?

1 mark (KU)

(c)What type of chemical reaction takes place when starch is broken down into glucose during digestion?

1 mark (KU)

(d)Process Y provides the body with energy. Name this process.

1 mark (KU)

12.Visking tubing can be used to model the gut wall.

(a)Describe how you would show that starch molecules are too large to pass through the visking tubing.

1 mark (PS)

(b)During digestion starch is hydrolysed by amylase.

(i)What is meant by "hydrolysed"?

1 mark (KU)

Topic 15 Homework – Carbohydrates