Topic 8 – National 4 Chemistry Homework
Everyday Consumer Products
Homework 1
1. Name the three elements present in all carbohydrates.
(1)
2. Give two examples of foods high in starch
(1)
3. Starch and glucose are examples of carbohydrates. There are chemical tests
that can distinguish between them. Describe how you would carry out the
Benedicts test to prove that a substance was glucose. You might find a labelled
diagram useful and make sure you mention the colour change.
(2)
4. What substance do we test starch with and what colour change do you see.
(1)
5. Copy out this paragraph, inserting the correct choice of word:
Starch is described as a (simple/complex) carbohydrate because it is made of many
sugar molecules joined together. When starch is broken down during digestion the
products of that reaction are molecules of the (simple/complex) carbohydrate
called (glucose/ethanol).
Starch must be broken down into small, ( soluble/insoluble) molecules so that it can
pass into cells and be used in a process called (respiration/photosynthesis). This
process (releases/takes in) energy.
(3)
6. (a) When starch is broken down during digestion give the name of this type of
chemical reaction?
(1)
(b) Give the name of the enzyme used to break down starch.
(1)
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Homework 2
1. What is the name for the process that makes alcohol.
(1)
2. Name two alcoholic drinks and state the name of the plants used to make them.
(1)
3. Describe how you would prove that the gas made in fermentation is carbon
dioxide.
(1)
4. What process is used to separate the ethanol from water.
(1)
5. The enzymes in yeast have an optimum temperature and pH they work at. What
does the word optimum mean?
(1)
6. The following table shows how solubility of different alcohols varies with size of
molecule.
Alkanol
Butan-1-ol
Pentan-1-ol
Hexan-1-ol
Heptan-1-ol
Octan-1-ol
Formula
C4H9OH
C5H11OH
C6H13OH
C7H15OH
C8H19OH
Solubility in water in g/l
63
22
5.9
0.5
a) Describe the relationship between number of carbons and solubility.
(1)
b) Predict the missing solubility for Heptan-1-ol.
(1)
7. Do some research and find out what is the recommended maximum weekly units
of alcohol for an adult male. How many pints of beer does that equal?
(2)
8. Give an example of a health issue caused by drinking too much alcohol.
(1)
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