Question1
Complete the following word equations
1-
Calcium carbonate
+ hydrochloric acid
calcium chloride +

water + __________________
2 ___________________________ + sulfuric acid 
magnesium sulfate + hydrogen
3. Magnesium + nitric acid  ___________________________ +
Hydrogen
4. Zinc hydroxide + ___________________________ 
zinc chloride + water
5. ____________________ + hydrochloric acid

magnesium chloride + water + carbon dioxide
6. Aluminium + hydrochloric acid
 ________________
+
hydrogen
7. sodium hydroxide + hydrochloric acid 
________________ +
________________
8. sodium carbonate + _________________
sodium sulfate +
water + ________________
9.___________________________ + nitric acid
calcium nitrate


+ water + carbon dioxide
10. ___________________________ + sulfuric acid 
iron(II) sulfate + hydrogen
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Question2
Complete the following word equations
1- Hydrochloric acid + sodium hydroxide 
………………………………. + ……………………………………
2- Sodium + water  ………………………………………. + ………………………………….
3- Magnesium + oxygen  ………………………………………………………………………
4- Sulfuric acid + magnesium carbonate  …………………………….. +
…………………………….. + ………………………………………….
5- Zinc + copper sulfate  ………………………………… + ………………………………………
6- Sulfuric acid + sodium hydroxide 
.....…………………………. + ……………………………………..
7- Hydrogen + oxygen  ……………………………………
8- Carbon + oxygen  …………………………………………
9- Aluminuim + nitric acid  ………………………………………. + ………………………………
10- Sodium + sulfur 
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Question 3
Complete and balance the symbol equations (you are allowed to write in the
spaces only)
1. __________________ + 2HCl(aq)  MgCl2(aq) + H2O(l) + ______________
2. Mg(OH)2(s) + H2SO4(aq)  _______________ + __________________
3. CuO(s) + __________________  Cu(NO3)2(aq) + H2O(l)
4. ________________ + H2SO4(aq)  MgSO4(aq) + H2O(l)
5. __________________ + H2SO4(aq)  MgSO4(aq) + H2O(l) + CO2(g)
6. Zn(OH)2(s) + 2HCl(aq)  ZnCl2(aq) + __________________
7. Mg(s) + H2SO4(aq)  ?__________________ +__________________
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Question 4
Complete the following word equations and write balanced chemical equations f
1- Calcium carbonate + hydrochloric acid 
……………………………………………………………………………………………………………………
……………………………………………………………………………………………………………………
2- Iron (III) oxide + sulfuric acid 
……………………………………………………………………………………………………………………
……………............................................................................................................
3- Sodium carbonate + sulfuric acid
……………………………………………………………………………………………………………………
……………............................................................................................................
4- Zinc + hydrochloric acid 
……………………………………………………………………………………………………………………
……………............................................................................................................
5- Aluminium + nitric acid 
……………………………………………………………………………………………………………………
……………............................................................................................................
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Question 5
Read the following paragraphs about some chemical processes (reactants and
products are underlined):
In car engines, where the temperature is very high, nitrogen gas reacts with oxygen
to form different oxides, one of these oxides is nitrogen dioxide which contributes
to acid rain (Reaction 1).
Carbon monoxide, a poisonous gas, is also formed by the reaction of oxygen and
carbon (present in fuels). (Reaction2).
Car manufactures use catalytic convertors to change these gases into the less
harmful products nitrogen, oxygen and carbon dioxide.
During the process of photosynthesis, plant combine carbon dioxide gas from the
atmosphere and water from the soil to produce glucose (C6H12O6) and oxygen gas
(Reaction 3).
In respiring, some living organisms burn glucose to produce carbon dioxide gas
and water vapor. (Reaction4).
In an industrial process, limestone (calcium carbonate) is strongly heated to
produce quicklime (calcium oxide) and carbon dioxide gas (reaction 5).
In the presence of water, iron (and steel) articles react with oxygen in the air to
form iron (III) oxide (Reaction 6).
In industry, zinc metal is extracted from zinc blend (zinc sulfide) by heating the
blend in air. The products are sulfur dioxide and zinc oxide (reaction7)
The metal oxide is then heated with carbon to produce the pure metal and a
colourless gas (reaction 8)
Write word and balanced chemical equations for reactions 1 to8
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Reaction 1:
……………………………………………………………………………………….
.………………………………………………………………………………….. (3)
Reaction 2:
………………………………………………………………………………………
………………………………………………………………………………….. (3)
Reaction 3:
………………………………………………………………………………………
………………………………………………………………................................ (3)
Reaction 4:
………………………………………………………………………………………
………..………………..…………………………………………………………(3)
Reaction 5:
……………………………………………………………………………………….
.…………………………………………………………………………………. (3)
Reaction 6:
………………………………………………………………………………………
…………………………………………………………………………………… (3)
Reaction 7:
………………………………………………………………………………………
…………………………………………………………………………………… (3)
Reaction 8:
………………………………………………………………………………………
…………………………………………………………………………………… (3)
[Total for Q 5, 24marks]
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