A substitute for common salt (sodium chloride) in a low sodium diet is potassium chloride.
A general equation for this kind of reaction is ... acid + alkali -> salt + hydrogen acid + alkali -> salt + water acid + metal -> salt + hydrogen acid + metal carbonate -> salt + water + carbon dioxide
What is the name for a reaction where all the acid in a solution is used up? decomposition displacement oxidation neutralisation
The result of a reaction between a metal and oxygen is metal oxide metal chloride hydrogen metal hydroxide
To see when all the acid is used up in the reaction a few drops of indicator can be added
If universal indicator is used you can see that all the acid is used up when the solution turns ... blue yellow green red
A weak alkali will turn universal indicator blue yellow green red
The diagram shows the reactivities of some elements. Match the elements in the list with each of the numbers 1-4 in the table
Which two of the following dissolve in water to produce an alkaline solution?
Choose from the list the two substances that are needed to complete the word equation.
? + ? --> lead + carbon dioxide
The diagram shows how aluminium is extracted from its ore.
From the following, which describes the chemical reaction that is used to extract aluminium from its ore, the best?
decomposition displacement reduction oxidation
Over time the positive electrode (anode) disappears. Why is this?
It burns away due to the high temperature and the oxygen that is released It is made of cryolite and it dissolves in the molten aluminium ore It reacts with impurities in the aluminium ore It reacts with the cryolite that the aluminium ore is dissolved in
Which best describes the reactions happening at the electrodes? Aluminium and oxygen are both oxidised Aluminium and oxygen are both reduced Aluminium is oxidised and oxygen is reduced Aluminium is reduced and oxygen is oxidised
The corrosion of iron is called rusting
What must be present in order for the iron to rust boiled water air water and oil air and water
What kind of reaction is this? oxidation reduction decomposition displacement
Samples of iron has been connected to other metals, and the amount of rusting studied after 48 hours.
From the results we can see that iron rusts less quickly when connected to either metal iron rusts less quickly when connected to zinc but more quickly when connected to copper iron rusts more quickly when connected to either metal iron rusts more quickly when connected to copper but less quickly when connected to zinc
This means that ... iron rusts less quickly when attached to a less reactive metal iron rusts more quickly when attached to a more reactive metal iron rusts when attached to any other metal iron rusts less quickly when attached to a more reactive metal
Aluminium displaces copper from its oxide when heated.
Aluminium does NOT react when heated with the oxide of lithium.
Potassium reacts faster with water than lithium.
Lithium metal is obtained from the metal chloride as shown in the diagram (in a similar way to aluminium). Use the diagram and the information to answer the questions.
Why is potassium chloride added to the lithium chloride? To make the electric current flow To make the lithium chloride melt at a temperature nearer to the boiling point of lithium To make the lithium chloride melt at a lower temperature To make the temperature high enough to melt the lithium metal that is produced
What happens at the positive electrode? neutral chlorine atoms gain electrons and become chloride ions chloride ions lose electrons and become neutral chlorine atoms Neutral lithium atoms lose electrons and become lithium ions lithium ions gain electrons and become neutral lithium atoms
Which of the following does not apply to the overall reaction for extracting lithium from its ore? Decomposition Displacement Electrolysis Redox
What is the reaction at the positive electrode called? decompositiuon electrolysis oxidation reduction
If two electrodes made from different metals are placed into an ionic solution an electrical cell is made and a current will flow through a wire that joins the two metals together
Due to the movement of electrons tin atoms become tin ions, so the tin corrodes tin ions become tin atoms, so the tin corrodes zinc atoms become zinc ions, so the zinc corrodes zinc ions become zinc atoms, so the zinc corrodes
The diagram shows a blast furnace.
What does the waste gas leaving the furnace consist of?
carbon dioxide (CO2) carbon monoxide (CO) nitrogen (N2) and carbon dioxide(CO2) nitrogen (N2) and carbon monoxide(CO)
Which word describes the reaction in the blast furnace where iron ore changes into iron? cracking neutralisation oxidation reduction
Where does the molten slag come from? Impurities from iron ore react with limestone to form molten slag Impurities from iron ore react with oxygen to form molten slag Coke reacts with limestone to form molten slag Iron ore reacts with coke to form molten slag
The diagram shows how impure silver can be made much purer.
silver atoms are transferred from the negative electrode to the positive electrode silver atoms are transferred from the positive electrode to the negative electrode silver ions come out of the solution at the negative electrode silver ions go into the solution at the positive electrode
What is this process for purifying silver called?
decomposition displacement electrolysis neutralisation
A very similar method can be used to put a thin layer of chrome onto taps or car bumpers.
What would be the correct set-up for doing this? A B C D
What happens to chrome atoms during this process? They are oxidised and then reduced They are reduced and then oxidised They are oxidised only They are reduced only
The diagram shows a cross section through part of a bridge
zinc paint steel tin
What is the name for this kind of protective covering galvanising sacrificial protection tin plating greasing
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Metals Module Test 
Metals Module Test