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WorksheetsCambridge Checkpoint Science 9: Salts
Total questions: 30
Worksheet time: 30mins
All acids contain
hydrogen
oxygen
carbon
sulfur
salts are formed chemically when
solutions are left to evaporate slowly
the hydrogen in an acid is replaced by a metal (or ammonium)
the oxygen in an acid is replaced by a metal (or ammonium)
solutions are made to evaporate quickly by heating
All salts formed when a metal reacts with H2SO4 are called:
nitrates
sulfates
carbonates
chlorides
All salts formed when a metal reacts with HNO3 are called:
nitrates
sulfates
carbonates
chlorides
All salts formed when a metal reacts with HCl are called:
nitrates
sulfates
carbonates
chlorides
All salts formed when a metal reacts with H2CO3 are called:
nitrates
sulfates
carbonates
chlorides
Reacting a metal with an acid will produce
a metallic salt and water
a metallic salt and hydrogen
a metallic salt and carbon dioxide
a metallic salt and water and carbon dioxide
Why is it not a good idea to react sodium metal directly with an acid?
sodium does not react easily when in direct contact with an acid, so will not produce a salt
sodium is an alkali metal so will only react with an alkali to form a salt
sodium is very reactive, so an "explosion" may occur
sodium is unreactive, so it is better to use sodium oxide to produce a sodium salt
Select all that apply:
Why is it not a good idea to react copper or silver metal metal directly with an acid to make a salt?
Both metals do not react easily when in direct contact with an acid, so will not produce a salt directly
Both metals will only react with an alkali to form a salt
Both are very reactive, so an "explosion" may occur
Both metals are unreactive, so it is better to use their metal oxides to produce a salt
Reacting a metal oxide with an acid will produce
a metallic salt and water
a metallic salt and hydrogen
a metallic salt and carbon dioxide
a metallic salt and water and carbon dioxide
Reacting a metal carbonate with an acid will produce
a metallic salt and water
a metallic salt and hydrogen
a metallic salt and carbon dioxide
a metallic salt and water and carbon dioxide
Reacting an alkali solution with an acid will produce
a salt and water
a salt and hydrogen
a salt and carbon dioxide
a salt and water and carbon dioxide
Carbonic acid is formed by
dissolving carbon dioxide with water
adding carbon with an acid
reacting carbon with an acid
reacting a carbonate with an acid
Select all that apply:
Carbonates are formed by
having carbon displace the sulfur atoms in a sulfate
having the carbon displace the nitrogen in a nitrate
reacting a metal with carbonic acid
reacting a non-metal with carbonic acid
The "squeaky pop" test is used to detect
oxygen
hydrogen
carbon dioxide
water
The "Limewater" test is used to detect
oxygen
hydrogen
carbon dioxide
water
When a burning match/splint is used to test the products of the reaction between an acid and a metal, it will
go out
burst into more flame
produce a squeaky pop
turn the solution milky
When a burning match/splint is used to test the products of the reaction between an acid and a metal carbonate, it will
go out
burst into more flame
produce a squeaky pop
turn the solution milky
To use the "Limewater test" to see if CO2 is produced in a test tube containing the reactants, you need to
add limewater to the products in the test tube. If CO2 is present, the solution will turn milky
add limewater to the products in the test tube. If CO2 is present, the milky solution will turn clear
capture the CO2 formed by capping the test tube and using a hose to direct it into a test tube containing limewater.If CO2 is present, the limewater will turn milky
capture the CO2 formed by capping the test tube and using a hose to direct it into a test tube containing limewater.If CO2 is present, the milky limewater will turn clear
Consider the reaction below:
H2SO4 + CuCO3 → CuSO4 + CO2 + H2O
Which compound(s) is/are considered a salt?
H2SO4 CuCO3 CuSO4
CuCO3 CuSO4
CuCO3 only
CuSO4 only
Consider the reaction below:
H2SO4 + CuCO3 → CuSO4 + CO2 + H2O
The evidence that CuSO4 is soluble, and CuCO3 is not, is
CuSO4 remains on the filter paper when the solution is filtered
CuCO3 remains on the filter paper when the solution is filtered
CuSO4 passes through the filter paper when the solution is filtered
CuCO3 passes through the filter paper when the solution is filtered
A substance is considered "soluble" if it
dissolves in acid
dissolves in water
dissolves in alkali
always remains as a solution
Consider the reaction below:
H2SO4 + CuCO3 → CuSO4 + CO2 + H2O
The solute is
H2SO4
CuCO3
CuSO4
Consider the reaction below:
H2SO4 + CuCO3 → CuSO4 + CO2 + H2O
The solvent is
H2SO4
CuCO3
CuSO4
In a neutralisation reaction, neutralisation occurs when the universal indicator solution in the conical flask
turns purple
turns blue
turns yellow
turns red
turns green
Consider the reaction below:
sodium hydroxide + hydrochloric acid → sodium chloride + water
Which solution(s) is/are normally added to the burette?
sodium hydroxide
hydrochloric acid
universal indicator solution
sodium chloride
Consider the reaction below:
sodium hydroxide + hydrochloric acid → sodium chloride + water
Which solution(s) is/are normally added to the conical flask?
sodium hydroxide
hydrochloric acid
universal indicator solution
sodium chloride
In a neutralisation reaction, why is it important to swirl the flask when adding a drop at a time from the burette?
to make sure the universal indicator is thoroughly mixed with the alkaline solution in the conical flask, giving time for it to change colour
to make sure the universal indicator is thoroughly mixed with the acidic solution in the conical flask, giving time for it to change colour
to make sure the acid is thoroughly mixed with the alkaline solution in the conical flask, giving time for it to change colour
to make sure the alkali is thoroughly mixed with the acidic solution in the conical flask, giving time for it to change colour
The best way to obtain crystals of a salt formed by a chemical reaction is to
Heat the solution to quickly evaporate any water, leaving only crystals
filter the solution, then heat the filtered solution to quickly evaporate any water, leaving only the salt crystals
leave the unfiltered solution to slowly evaporate until only crystals remain
filter the solution, then allow the solution to slowly evaporate until only the salt crystals remain
The reason why charcoal powder is added to the final result of a neutralisation reaction is to
turn the solution into carbonic acid
form a carbonate salt leaving the remaining water pure
remove any universal indicator colour from the solution
create a mess to be dealt with by filtering
