Name: ________________________
Teacher: ___________________
Homework 1– Chemical Reactions
1.
Write down three examples of everyday chemical reactions.
2.
Write word equations for the following reactions:
(a)
Hydrogen joins up with oxygen to form water.
(b) The reaction of sulphuric acid with calcium carbonate
produces calcium sulphate, carbon dioxide and water.
(c)
Silver oxide breaks up when heated to form its elements.
(d)
Ammonium sulphate is produced by the reactions of
ammonia with sulphuric acid.
3. If a substance effervesces (fizzes), is there a chemical reaction
taking place?
Explain your answer.
4. The first 20 elements (hydrogen to calcium) in the periodic table were
all discovered before the twentieth century began. Use the data
booklet (page 8) to help you answer the following questions about
these elements.
(a) Which two elements were known in prehistoric times?
(b) Which elements were discovered in the 18th century?
(c) Name three elements from your periodic table which are named
after famous scientists.
5. Name two elements which are:
a
b
c
d
e
f
g
metallic
non-metallic
solid at room temperature
liquid at room temperature
gas at room temperature
naturally occurring
made by scientists
Name: ________________________
Teacher: ___________________
6. The elements are arranged in the Periodic Table
a
What is meant by a group?
b
What is meant by a period?
c
Give an example of a physical similarity of elements
in group 1.
d
Give an example of a chemical similarity of elements
in group 1.
7. Divide the following list of substances into elements and compounds.
carbon, petrol, alcohol, zinc, oxygen, sugar, sodium chloride, gold,
copper sulphate, nitrogen, aluminium, silver oxide
8. Explain what is meant by
(a)
an element
(b)
a compound
(c)
a mixture
(d)
a solute
(e)
a solvent
(f)
a solution
9. Name the compound which is formed when each of the following pairs
of elements join up.
(i) magnesium and chlorine
(ii) lead and sulphur
(iii) sodium and oxygen
(iv) hydrogen and iodine
10.
Name two possible compounds containing potassium, sulphur and
oxygen.
11.
(a)
(b)
12.
What elements are present in:
(a)
(b)
13.
How many elements are there in compounds whose names end
in “ide”.
If a compounds name ends in “ite” or “ate”, what does this
tell you about the number of elements in the compound and
which element is always present?
sulphur oxide
potassium sulphate
(c)
(d)
phosphorus chloride
lithium sulphite
Crude oil is a mixture of compounds.
Explain clearly what is meant by this statement
Name: ________________________
Teacher: ___________________
Homework 2 – Speed of Reactions
1.
List the following in order of rate of reaction, fastest first:
Milk turning sour
A motor car rusting
Frying an egg
Striking a match
2.
The grid shows factors that can affect the speed of a chemical
reaction.
A
B
increase in
particle size
D
C
increase in
concentration
E
decrease in
particle size
increase in
temperature
F
decrease in
concentration
decrease in
temperature
Identify the factor responsible for the change in speed of reaction
in each of the following examples.
(a) Seawater corrodes iron jetties near the Equator more quickly
than in northern Scandinavia.
(b) Magnesium ribbon burns more slowly than magnesium powder.
(c) Two scoops of biological detergent in a washing machine remove
stains from clothing more quickly than using one scoop.
3.
The speed of a reaction depends on the reaction conditions.
Describe how
each of the following affects the speed of a reaction.
a)
particle size of the reactants
b)
concentration of reactants
c)
temperature of reactants
d)
using a catalyst
4.
Explain each of the following
a)
A log burns faster if it is chopped into small sticks
b)
Food is preserved longer when stored in a fridge
c)
Plants grow faster in a greenhouse than in the open air
5.
Three experiments were set up as shown. Each experiment is
Name: ________________________
Teacher: ___________________
carried out at
room temperature and the mass of magnesium is the
same in each case.
(a)
Explain any difference that would be observed between
(i)
A and B
(ii)
A and C
A was
(b)
Explain any difference that would be observed if experiment
repeated at 50oC
Name: ________________________
Teacher: ___________________
Homework 3 – Speed of Reactions
Interpreting Graphs
1. The graph shows the volume of carbon dioxide produced in the reaction of
(i)
calcium carbonate powder
(ii)
calcium carbonate lumps
with excess dilute hydrochloric acid
Volume
of carbon
dioxide /
cm3
x
y
Time / s
a)
b)
2.
Which graph, X or Y, shows the results of using calcium
carbonate powder?
State three variables that must be kept the same when
comparing the reactions
5g of magnesium ribbon was added to excess sulphuric acid and the
Volume
of
hydrogen
/ cm3
Time / s
volume of hydrogen gas evolved was measured. A graph of the
result is shown below:-
Name: ________________________
a)
b)
Teacher: ___________________
Copy the graph and draw a line to show how the volume of hydrogen
produced would compare if 5g of magnesium powder was added to
the acid.
Draw another line of the graph showing the volume of hydrogen
produced if 2.5g of magnesium ribbon was added.