Building Blocks 1d
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Int 2
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Which elements are conductors
of electricity?
Metals
and the non-metal
carbon(graphite)
Which elements are
non- conductors
of electricity?
Non metals except
carbon(graphite)
Why are metals able to
conduct electricity?
They contain free moving
electrons
Which type of compounds (solid,
liquid, solution) do not
conduct electricity?
Covalent compounds
(non metals atoms)
Why are covalent compounds unable
to conduct electricity?
They are made up of
molecules which are
uncharged.
They do not contain charged
ions.
In which state will an ionic
compound not conduct electricity?
solid
Why are ionic compounds able to
conduct electricity when molten or in
solution?
They ions are free to move
Why do ionic compounds not
conduct electricity when solid?
They ions are not
free to move
A solid substance conducts
electricity.
What type of substance is it?
Metal or carbon(graphite)
(no compound conducts
when solid)
A substance does not conduct when
solid but is able to conduct when
molten/solution.
What type of substance is it?
Ionic
Metal/non-metal compound
A substance does not conduct
electricity in any state.
What type of substance is it?
Covalent
A substance does not conduct electricity
in any state and has a very high
melting/boiling point.
What type of substance is it?
Covalent network
A substance does not conduct electricity
in any state and has a low
melting/boiling point.
What type of substance is it?
Covalent molecule
Are ionic compounds usually
soluble or insoluble in water?
soluble
Are covalent compounds usually
soluble or insoluble in water?
Insoluble
What is electrolysis?
The breaking up of an ionic compound
using electricity.
What is an electric current?
A flow of electrons
A pupil passed electricity through copper
chloride solution. What would be seen at
the negative electrode?
Brown solid/copper metal
- positive metal ions are attracted to
the negative electrode.
Chlorine gas(bubbles of gas would be
seen at the positive electrode chloride ions are negative.
A pupil passed electricity through
copper chloride solution.
Write ion electron equations showing
the formation of copper and the
formation of chlorine .?
At negative electrode: Cu2+ + 2e-
At positive electrode: 2Cl-
Cu
Cl2 + 2e-
Why must a d.c supply be used in
electrolysis?
So that the products can
be identified.
So only one product is
collected/given off at an electrode.
Are electrons gained or lost at the
negative electrode?
Positive metal ions
gain electrons.
Write the formula for the followingcarbon monoxide, nitrogen dioxide,
sulphur trioxide, dinitrogen tetraoxide,
carbon tetrachloride,
CO
NO2
N2O4
SO3
CCl4
Write the formula for the following
lithium chloride, magnesium nitride,
aluminium nitride, sodium sulphide
LiCl
Mg3N2
AlN
Na2S
Write the formula for the following
iron(II) oxide, copper(I) oxide,
Silver(I) chloride, iron(III)chloride
FeO
Cu2O
AgCl
FeCl3
Write the formula for the following
sodium sulphate, copper carbonate,
magnesium hydroxide, ammonium
carbonate, calcium nitrate
Na2SO4
CuCO3
Mg(OH)2
(NH4)2CO3
Ca(NO3)
Balance to following equations
C3H8 + O2
CO2 + H2O
Al + Cl2
AlCl3
CaCO3 + HCl
CaCl2 + CO2 + H2O
C3H8 + 5 O2
3 CO2 + 4 H2O
2Al + 3Cl2
2AlCl3
CaCO3 + 2HCl
CaCl2 + CO2 + H2O
Calculate the formula mass of the following
CH4
H2O
Na2 SO4
Ca(NO3)2
CH4 12 + 4 =16
H2O (2 x 1) + 16 = 18
Na2 SO4 (2 x 23) + 32 + (4 x16) = 142
Ca(NO3)2 40 + (2 x 14) + (6 x 16) =164
Calculate one mole of the following
Cl2
CaCO3
CO2
Mg(OH)2
Cl2
2 x 35.5 = 71g
CaCO3 40 + 12 + (3x16) = 100g
CO2
12 + (2 x 16) = 44g
Mg(OH)2 24.5 + (2 x 16) + (2 x 1) = 58.5 g
Calculate the number of moles in the following
88g CO2
10g CaCO3
10.1g KNO3
16g O2
1 mole CO2 = 12 + (2 x 16) = 44g
88/44 = 2 moles
1 mole CaCO3 = 40 + 12 + (3 x 16) = 100g
10/100 = 0.1 moles
1 mole KNO3 = 39 + 14 + (3 x 16) = 101g
10.1/101 = 0.1 moles
1 mole O2 = 2 x 16 = 32 g
16/32 = 0.5 moles
Calculate the mass of the following
4 moles HCl
0.1 moles H2S
0.25 moles CaCO3 0.5 moles (NH4)2SO4
1mole HCl = 1 x 35.5 = 36.5g
4 moles = 4 x 36.6 = 146g
1mole of H2S = (2 x 1) + 32 = 34 g
0.1 moles = 0.1 x 34 = 3.4g
1 moles CaCO3 = 40 + 12 + (3 x 16) = 100g
0.25 moles = 0.25 x 100 = 25g
1 mole (NH4)2SO4 = (2 x 14) + (8 x 1) + 32 + (4 x 16) = 132g
0.5 moles = 0.5 x 132 = 66g
Calculate the mass of carbon dioxide is produced when
4g of methane burns completely in oxygen.
CH4 +
2O2
CO2 +
2H2O
1 mole of CH4 produced 1 mole of CO2
if 16g
gives
44g
then 4g
gives
4/16 x 44
= 11g
( 4g is a 1/4 of 16g so a 1/4 of 44g is 11g)
Calculate the mass of water produced on
burning 2.8g of ethene.
C2H4 + 3O2
2CO2 + 2H2O
1 moles of ethene C2H4 produced 2 moles water H2O
28g (1 mole) gives 36g (2 moles)
2.8g
gives 2.8/28 x 36
= 3.6g
( 2.8g is a tenth of 28g
so a tenth of 36g is 3.6g
Building Blocks 1d
1
2
4
3
10
5
6
7
12
13
14
8
9
15
16
17
18
19
20
22
23
24
25
26
27
28
11
Int 2
29
30
31
21
32