Form 4 ( )
1. Complete the table
Name of the compound
T.W.G..Hs. Chen Zao Men College
Chemistry Exercise
Name : ________________(
Formula
Name of compound
)
formula
Sodium bromide
K2O
Calcium nitrate
FeCl3
Zinc chloride
FeSO4
Copper (II) hydroxide
PbCl2
Magnesium oxide
Mg(NO3)2
2. Chlorine is an element of group VII , third period. The natural abundance of chlorine contains
30% chlorine-37 and 70 % chlorine-35.
a)
b)
c)
d)
Write the atomic symbol for Chlorine-37 .
How many neutrons are there in Chlorine-37
What is the relationship between Chlorine-37 and chlorine-35 ?
Calculate the atomic mass of chlorine .
3) X, Y and Z are three elements with atomic number 11, 16, and 17 respectively.
Using dots and crosses to represent electrons, show how the following compounds are
any 2 elements
a) Ionic bond
b) covalent bond
c) How do you test that the compound formed is an ionic compound ?
2. State the observations and write equations for all chemical reaction that have occurred.
a). Adding a piece of
magnesium to copper(II)
sulphate
b) Adding a piece of
calcium into a test tube
containing water
c)
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formed by
c) A piece of zinc is
added to hydrochloric
acid
d) copper(II) oxide is
heated strongly with
carbon .
e) lead(II) oxide
heated with carbon
is
3. Draw a labelled diagram to show how you obtain test tubes of hydrogen gas by reacting steam and
iron filings.
a) Write equation for the formation of hydrogen gas.
b) How do you test the gas.
5)
X ,Y and Z are three metals . The oxide of Y can be reduced by using carbon but Z cannot . Z
is displaced from its solution by X..
a) Which is the most reactive metal
?
b) Arrange the metals in the descending order of reactivity.
c)
6) State 4 physical properties of metals ?
a)
b)
c)
d)
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