Nat 4/5 Acids and Bases Homework 1
1.(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
What is meant by the pH of a solution?
Describe how the pH of a solution can be measured.
What colours do acids turn pH paper?
What range of pH values can be shown by acids?
What colours do alkalis turn pH paper
What range of pH values can be shown by alkalis?
What colour do neutral solutions turn pH paper?
What is the pH of a neutral solution?
(4)
2.
Consider the following list
iron (III) oxide, sodium oxide, carbon dioxide
calcium oxide,
nitrogen dioxide, copper (II) oxide
(a)
(b)
3.
(a)
(b)
4.
(a)
(c)
(e)
Name two substances that dissolve to produce a solution that has a
pH below 7.
Name two substances that dissolve to produce a solution that has a
pH above 7.
(2)
Many pollution problems are linked to the release of sulphur dioxide
into the air.
What name is given to a solution of sulphur dioxide in rain-water?
Give two examples of damage that can be caused by this solution?
Write the chemical formula for the following compounds
iron (III) oxide
(b) sodium oxide,
carbon dioxide
(d) calcium oxide,
nitrogen dioxide
(f) copper (II) oxide
(3)
(6)
TOTAL 15 marks
Nat 4/5 Acids and Bases Homework 2
1.
As a homework exercise pupils were asked to find the pH values of a
number of substances found in the home. One pupil wrote her results
as follows.
Bicarbonate of soda -9; vinegar - 4; drain cleaner - 14 ;
cola drink -3; Milk - 8; indigestion pill - 10; window cleaner -12 ;
lemon juice -3 ; washing up liquid -7
(a)
(b)
Present the above results as a table.
Present the above results as a bar graph.
2.
(a)
(b)
(i)
(ii)
(iii)
Acid solutions contain H+ (aq) ions and so does pure water.
Explain why pure water is not an acid
When water is added to an acid solution the pH rises.
Explain why this happens
What is the highest value to which the pH can rise?
Explain your answer to (ii)
(4)
3.
(a)
(b)
Chromium (Vl) oxide reacts with water to form chromic acid.
Why might we not expect chromium (Vl) oxide to form an acid?
Write the chemical formula for chromium (Vl) oxide
(2)
4.
Sulphuric acid is used in car batteries. It is so acidic that it has
a pH of 1. If battery acid is spilled on clothing, adding plenty of
water to the spillage is usually recommended as a simple, but
effective, first thing to do.
What effect does dilution have on the level of acidity of the acid?
What is the effect of dilution on the pH of the acid?
What effect does dilution have on the hydrogen ion concentration?
(a)
(b)
(c)
(4)
(3)
5.(a) Write a word equation for the reaction of lithium oxide with water
to give lithium hydroxide.
(b)
Rewrite the equation using simple chemical formulae
(No need to balance it)
(2)
TOTAL 15 marks
Nat 4/5 Acids and Bases Homework 3
1.(a) Explain what is meant by a neutralisation reaction.
(b) What happens to the pH of an acid as it is neutralised?
2.
(a)
(b)
3.
(a)(i)
(ii)
(b)
Name all the products which would be formed in the reaction
between each of the following solutions.
potassium hydroxide and nitric acid
sodium hydroxide and sulphuric acid
(2)
(2)
Metal carbonates can react with dilute acid in neutralisation reactions.
Which gas is produced when a metal carbonate reacts with dilute acid?
Describe the test for this gas (give test and result).
Name all the products formed when calcium carbonate reacts with
dilute
hydrochloric acid
(3)
4.
Name the acid and alkali which could be used to prepare solutions of
each
of the following compounds
(a) barium nitrate
(b) sodium sulphate
(2)
5.
Sodium nitrate and sodium carbonate are both white solids. Given a
sample of each, describe a test you could carry out to discover which was
which.
(use your knowledge of acid reactions to help you)
(2)
6.(a) Calculate the number of moles in 36g carbon
(b) Calculate the mass of 3 moles of oxygen (careful!!)
(c) Calculate (i)
the formula mass of magnesium oxide
(ii) the mass of 0.1 moles of magnesium oxide
(4)
TOTAL 15 marks
Nat 4/5 Acids and Bases Homework 4
1.
The following list contains chemicals found in a Chemistry lab
Use the chemicals in the list to answer the questions
Hydrochloric acid, copper, sulphuric acid, copper carbonate,
zinc, sodium hydroxide, magnesium, potassium carbonate,
(a)
(b)
(c)
(d)
2.
Name two chemicals that could be reacted to prepare hydrogen gas.
Name two chemicals that could be reacted to prepare carbon dioxide
gas.
Name two chemicals that could be reacted to prepare copper sulphate.
Which two would react together to form sodium chloride?
(4)
(a)
(b)
Taking indigestion remedies to cure acid indigestion is an example of
an everyday neutralisation reaction.
Give another everyday example of neutralisation that involves
the use of lime
the use of vinegar
(2)
3.
Explain the difference in meaning between a base and an alkali.
4.
Insoluble salts are prepared by precipitation reactions. Describe how
you would prepare a pure dry sample of lead iodide.
(2)
5.(a)
(b)
(c)
(d)
(e)
Write the chemical formula for lead (ll) iodide
Write the ionic formula for lead (ll) iodide.
Find the mass of 1 mole of lead iodide.
How many moles are in 92.2g of lead (ll) iodide?
What other term can be used instead of saying ‘the mass of one mole’?
(5)
TOTAL 15 marks
(2)
Nat 4/5 Acids and Bases Homework 5
1.
(a)
(b)
(c)
Sodium sulphate solution and barium chloride solution were mixed
in a beaker. A white solid was seen to form.
Name this white solid.
Name the kind of reaction that occurred.
Name the technique which could be used to separate the white solid
from the solution.
(3)
2.
Jack prepared copper(ll) sulphate by adding excess solid copper (ll)
oxide to sulphuric acid. Jill prepared sodium chloride by titrating sodium
hydroxide solution with hydrochloric acid.
Explain why Jack and Jill used different methods to prepare their salts.
(2)
3
Explain the meaning of the following words
(a)Titration
(b) Burette
(c)
Pipette
(3)
4.(a) On which page of the Data Book do you find information about
solubility?
(b) Using the table on that page to make a statement about the solubility of
ammonium compounds.
(2)
5.
(a)
(b)
Name the gas produced when the following pairs of chemicals react
calcium carbonate and hydrochloric acid
sulphur and oxygen
(2)
6.
(a)
(b)
(c)
Explain what is meant by:
an exothermic reaction
precipitation
concentration
(3)
TOTAL 15marks