Exam code: 0653
The products of a reaction are water, calcium chloride and carbon dioxide only.
Which reaction mixture gives these products?
calcium and hydrochloric acid
calcium hydroxide and hydrochloric acid
calcium carbonate and hydrochloric acid
calcium oxide and hydrochloric acid
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Which row identifies the formulas of an acidic oxide and a basic oxide?
acidic oxide | basic oxide | |
|---|---|---|
A | NO2 | CaO |
B | SO2 | CO2 |
C | CuO | Na2O |
D | Li2O | SiO2 |
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Fig. 4.1 shows the electrolysis of concentrated aqueous sodium chloride using inert electrodes.
State the name of the positive electrode.
Identify the gases produced at the electrodes.
positive electrode: ..................
negative electrode: ..................
The electrolysis of concentrated aqueous sodium chloride produces a solution containing an alkali.
(i) State what is meant by an alkali.
[1]
(ii) State what colour change is observed when methyl orange is added to a solution containing an alkali.
from orange to ...........................................................
[1]
The electrolysis shown in Fig. 4.1 produces the alkali sodium hydroxide.
Aqueous sodium hydroxide reacts with dilute sulfuric acid.
(i) Complete the word equation for this reaction.
[1]
(ii) The reaction between aqueous sodium hydroxide and dilute sulfuric acid is exothermic.
State what is meant by an exothermic reaction.
[2]
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