Define the term anion.
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Define the term anion.
An anion is a negatively charged ion.
Describe the test and result for bromide ions.
The test and result for bromide ions is:
Add dilute nitric acid followed by silver nitrate solution
A cream precipitate is formed
What is the formula of a carbonate ion?
The formula of a carbonate ion is CO32-.
Describe the test and result for carbonate ions.
The test for carbonate ions is:
Add dilute hydrochloic acid and test the gas produced by bubbling it through limewater.
If carbonate ions are present, carbon dioxide is produced which turns limewater cloudy.
Describe the test and result for iodide ions.
The test and result for iodide ions is:
Add dilute nitric acid followed by silver nitrate solution
A yellow precipitate is formed
True or False?
Chloride ions give a white precipitate with acidified silver nitrate solution.
True.
Chloride ions give a white precipitate with silver nitrate solution.
True or False?
To test for sulfate ions, dilute nitrate acid and acidified berylium nitrate are used.
False.
To test for sulfate ions, dilute nitric acid and acidified barium nitrate are used.
Name the white precipitate formed during a positive test for sulfate ions.
The white precipitate formed during a positive test for sulfate ions is barium sulfate.
When acidified silver nitrate solution is added to a sample containing bromide ions, a precipitate of silver bromide is formed.
What is the state symbol for this precipitate?
The state symbol for the precipitate of silver bromide is s.
Give the formula of the precipitate formed when silver nitrate solution is added to a solution containing iodide ions.
The formula of the precipitate formed when silver nitrate solution is added to a solution containing iodide ions is AgI.
Give the formula of the sulfite ion.
The formula of the sulfite ion is SO32-.
Describe the test and result for sulfite ions.
The test and result for sulfite ions is to:
Add dilute acid and warm the mixture
Bubble the gas through potassium manganate(VII) solution
The solution will change from purple to colourless
Describe the test and result for nitrate ions.
The test and result for nitrate ions is:
Add sodium hydroxide solution and aluminium foil
The gas produced (ammonia) should turn damp red litmus paper blue
Define the term cation.
A cation is a positively charged ion.
What is a flame test used for?
A flame test is used to identify metal ions by the colour of the flame they produce when heated.
True or False?
The Bunsen burner flame should be on a blue flame for flame tests.
True.
The Bunsen burner flame should be on a blue flame for flame tests as this is the hottest flame.
Give the flame colour produced by sodium ions.
The flame colour produced by sodium ions is yellow.
Give the flame colour produced by copper(II) ions.
The flame colour produced by copper ions is blue -green.
True or False?
The flame colour produced by potassium ions is pink.
False.
The flame colour produced by potassium ions is lilac.
Give the flame colour produced by calcium ions.
The flame colour produced by calcium ions is orange-red.
True or False?
The flame colour produced by lithium ions is red.
True.
The flame colour produced by lithium ions is red.
Why is the nichrome wire first dipped in hydrochloric acid?
The nichrome wire is first dipped in hydrochloric acid to avoid contamination.
Give the flame colour produced by barium ions.
The flame colour produced by barium ions is apple-green.
What colour precipitate is formed when sodium hydroxide is added to a solution containing copper(II) ions?
The colour of the precipitate formed when sodium hydroxide is added to a solution containing copper(II) ions is blue.
True or False?
Iron(III) ions form a green precipitate in the presence of sodium hydroxide.
False.
Iron(III) ions form a brown precipitate in the presence of sodium hydroxide.
What colour precipitate is formed when sodium hydroxide is added to a solution containing iron(II) ions??
The colour of the precipitate formed by iron(II) ions in the presence of sodium hydroxide is green.
True or False?
Ca2+ ions form a red precipitate in the presence of sodium hydroxide.
False.
Ca2+ form a white precipitate in the presence of sodium hydroxide.
Describe a test for ammonium ions.
The test for ammonium ions is:
Add sodium hydroxide solution
If ammonium ions are present, ammonia gas is produced which turns damp red litmus paper blue.
True or False?
The green precipitate formed by Cr3+ ions will not dissolve in excess sodium hydroxide solution.
False.
The green precipitate formed by Cr3+ ions will dissolve in excess sodium hydroxide solution to give a green solution.
Describe a test using sodium hydroxide to distinguish between solutions containing Al3+ ions and Ca2+ ions.
A test using sodium hydroxide to distinguish between solutions containing Al3+ ions and Ca2+ ions is:
Both solutions will give a white precipitate with sodium hydroxide solution
When excess sodium hydroxide is added, the precipitate containing Al3+ ions will dissolve, but the one with Ca2+ will not
True or false?
When ammonia is added to a solution containing Zn2+ ions, a white precipitate forms.
True.
When ammonia is added to a solution containing Zn2+ ions, a white precipitate forms.
What colour precipitate is formed when ammonia added to a solution containing aluminium ions?
When ammonia solution is added to a solution containing aluminium ions, a white precipitate is formed.
True or false?
When excess ammonia is added to a precipitate containing Cr3+ ions, the precipitate dissolves to form a green solution.
False.
When excess ammonia is added to a precipitate containing Cr3+ ions, the precipitate does not dissolve, it only dissolves in excess NaOH.
Give the test and result for hydrogen gas.
The test and result for hydrogen gas is a lit / burning splint makes a 'squeaky pop' sound.
Give the test and result for oxygen gas.
The test and result for oxygen gas is a glowing splint relights.
Give the test and result for carbon dioxide gas.
The test and result for carbon dioxide gas is limewater turns cloudy / milky.
Give the test and result for chlorine gas.
The test and result for chlorine gas is that damp litmus paper turns red and then bleaches white.
Give the test and result for ammonia gas.
The test and result for ammonia gas is using damp red litmus paper which will turn blue.
True or False?
Chlorine is a colourless, pungent gas.
False.
Chlorine is a green pungent gas
Give the test and result for sulfur dioxide gas.
The test and result for sulfur dioxide gas is to bubble the gas through acidified potassium manganate(VII) which changes from purple to colourless.