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MUSINGU HIGH SCHOOL
NOVEMBER/DECEMBER HOLIDAY ASSIGNMENT
CHEMISTRY FORM ONE
NAME:…………………………………………………..……. ADM NO:…………
1
Use the information shown in the diagram below to answer the question
that follows?
Hydrogen gas
(i)
(ii)
2.
Metal Oxide
Heat
Explain why it is important to pass the hydrogen for some time before lighting it at point
Z.
Write an equation for reaction that takes place when hydrogen burns at point Z.
When hydrogen gas is passed over heated lead (II) oxide a
reaction occurs. The diagram below shows a set up that could be used
for this reaction.
Lead oxide
Dry hydrogen
Heat
(a) What observation would be made in the combustion tube?
3.
4.
Hydrogen
burning
A solution of hydrogen chloride gas in water liberates hydrogen when reacted with Zinc metal
while a solution of the same gas in methylbenzene does not. Explain
(2 Marks)
Study the diagram below and answer the questions that follow.
Write an equation for each of the two reactions that take, place in
the experiment represented by the diagram above
5.
(2 Marks)
(2 marks)
The diagram below is set – up for the laboratory preparation of oxygen gas
1
(a) Name solid R
(b) Write an equation for the reaction that takes place in the flask
(c) Give one commercial use of oxygen
The set – up below was used to prepare hydrogen gas
6.
a)
7
Complete the diagram to show how a dry sample of hydrogen gas can be collected
b)
Write an equation for the reaction, which takes place when hydrogen gas burns in air.
d)
State two industrial uses of hydrogen gas.
The diagram below shows a student’s set-up for the preparation and collection of
hydrogen gas.
(a) How would the final volume of hydrogen gas produced be affected if 80cm3
of 0,75 M hydrochloric acid was used?
(1 mark)
8.
Coal, oil and natural gas are major sources of energy. They are known as fossil Hydrogen is
also a source of energy.
(i) State and explain two reasons why hydrogen is a very attractive fuel compared to
fossil fuels
(3 marks)
(ii) State one disadvantage of using hydrogen fuel instead of fossil fuel.
9.
State two reasons why hydrogen is not commonly used as a fuel.
(1 mark)
(2 marks)
2
10.
An element X has atomic number 3, relative atomic mass 6.94 and consist of two isotopes of
mass numbers 6 and 7. What is the mass number of the more abundant isotope of X? Give a reason for
your answer.
(i)
Complete the following table
Mass number of isotope
11.
Number of neutrons
Number of electrons
The atomic number of an element Y is 18
(i)
Write down its electronic arrangement
(ii)
Give one use of element Y
12.
(a)The table below shows the atomic numbers of elements of the periodic table represented by
letter J to Q.
The letters are not the actual chemical symbols for the elements
Element
Atomic
number
J
3
K
7
L
8
M
9
N
10
P
12
O
13
(i) Select two elements which belong to:
I The same period of the periodic table
Q
14
(1 mark)
II The same group of the periodic table
13.
Metal p is a group 2 element in the periodic table and it lies below Q in the same group
(a) Explain how the reactivity of metal P and Q with bromine compares
(1 mark)
(b)
14.
Given that the atomic number of Q is 12, determine the atomic number of P. Show how
you arrive at your answer
(2 marks)
Element E has atomic number 15.
(a) Write the electron arrangement for an atom E
(b)
(1 mark)
Explain why E forms a chloride which is a liquid of low boiling point
15.
Element J whose atomic numbers is 31 has two isotopes. The table below shows the mass
numbers and the relative abundance for each isotope
Mass number
69
71
(a)
(b)
Relative abundance (%)
60.4
39.6
Determine the number of neutrons in the isotope with mass 69
Calculate the relative atomic mass of element J
(1 mark)
(2 marks)
3
16.
17.
An element X has atomic number 30 while element Y has atomic number 8
(a) Write the electron arrangement for X
(1 mark)
(b) What type of bond would be formed when X and Y react
(1 mark)
Complete the table below
Isotope
Number of
Protons
Neutrons
Electrons
59
27
18.
The electron arrangement of ions X3+ and Y2- are 2, 8 and 2, 8, 8 respectively
(a) Write the electron arrangement of the elements X and Y
(2 marks)
15.
The table below gives the atomic numbers of elements W, X, Y and Z. The letters do not
represent the actual symbols of the elements.
Element
Atomic number
W
9
X
10
Y
11
Z
12
(a) Which one of the elements is less reactive? Explain
....................................................................................................................................
(b) (i) Which two elements would react most vigorously with each other?
(1 mark)
..............................................................................................................................................
................................................................................................................................
(ii) Give the formula of the compound formed when the elements in b (i) above
react
19.
1997 Paper 1A Q 23
An element Y has the electronic configuration 2.8.5
(a) Which period of the periodic table does the element belong?
(1 mark)
....................................................................................................................................
(b)
Write the formula of the most suitable anion formed when element Y ionizes
(1mark)
....................................................................................................................................
(c) Explain the difference between the atomic radius of element Y and its ionic radius
(1 mark)
....................................................................................................................................
4