4202588
Questão 1
Questão
What does the cathode attract?
Responda
-
Positive ions (metals and hydrogen)
-
Negative ions (Non-metals and group 7 elements)
Questão 2
Questão
Oxidation is gaining of electrons.
Responda
- True
- False
Questão 3
Questão
What is Electrolysis?
Responda
-
Electrolysis is the breaking down of elements into smaller elements. The substance must be in a solution to allow the electric current to pass through.
-
Electrolysis is the breaking down of an ionic substance into ions. The substance used is called an eletriclyte and must be in liquid form.
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Electrolysis is the breaking down of an ionic substance into simpler substances. The substance used is called the electrolyte and must be in liquid form.
Questão 4
Questão
Ionic substances contain [blank_start]charged[blank_end] particles called ions. For electrolysis to work, the ions must be [blank_start]free[blank_end] to move. Ions are free to move when an ionic substance is dissolved in water or when [blank_start]melted[blank_end].
Responda
-
free
-
not free
-
melted
-
frozen
-
charged
-
normal
Questão 5
Questão
Label the cathode and the anode on the diagram below.
Responda
-
Anode
-
Cathode
Questão 6
Questão
Electroplating is the process in which you are coating a cheaper metal with a more expensive one, such as copper or silver.
Responda
- True
- False
Questão 7
Questão
The object to be plated, such as a metal pan, is connected to the [blank_start]negative[blank_end] terminal of the power supply. A piece of [blank_start]copper[blank_end] is connected to the [blank_start]positive[blank_end] terminal. The electrolyte is [blank_start]coppersulfate[blank_end] solution.
Responda
-
negative
-
positive
-
copper
-
lead
-
copper sulphate
-
copper nitrate
-
positive
-
negative
Questão 8
Questão
What are the two ways of making a substance ready for electrolysis?
Responda
-
Melt it
-
React the substance with a metal
-
Make the substance a solution with water
-
Put some universal indicator in the liquid
Questão 9
Questão
Which one of the following is not a reason for electroplating?
Responda
-
To make it a conductor for heat and electricity
-
To make the object look more attractive
-
To increase the hardness of the surfaces of the object
-
To protect a metal object from corroding
Questão 10
Questão
Sodium hydroxide is a strong [blank_start]alkali[blank_end] and has many uses including making [blank_start]soap[blank_end], making paper, making bleach, neutralising [blank_start]acids[blank_end] and controlling pH.
Responda
-
alkali
-
acid
-
soap
-
shower gel
-
acids
-
alkalis
Questão 11
Questão
[blank_start]Chlorine[blank_end] is used to kill bacteria in drinking water and in swimming pools, and to make bleach, [blank_start]disinfectants[blank_end] and plastics. [blank_start]Hydrogen[blank_end] is used to make [blank_start]margarine[blank_end] and rocket fuel.
Responda
-
margarine
-
butter
-
Chlorine
-
Hydrogen
-
disinfectants
-
cardboard
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