Give the test and result for hydrogen gas.
Enjoying Flashcards?
Tell us what you think
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
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.
Define the term cation.
A cation is a positively charged ion.
What is the formula of an ammonium ion?
The formula of an ammonium ion is NH4+.
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.
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.
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.
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, acidified berylium chloride is used.
False.
To test for sulfate ions, barium chloride is 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.
Describe the chemical test for water.
The chemical test for water is anhydrous copper(II) sulfate turning from white to blue on the addition of water.
Define the term pure substance.
A pure substance consists of a single element or compound.
Describe the physical test used to determine whether a sample of water is pure.
The physical test to determine whether a sample of water is pure is to check its boiling point which should be exactly 100 oC.
What colour does anhydrous copper(II) sulfate turn in the presence of water?
Anhydrous copper(II) sulfate turns blue in the presence of water.
True or False?
Impurities tend to raise the boiling point of water.
True.
Impurities tend to raise the boiling point of water.
Name the piece of apparatus used to check the boiling point of water.
The piece of apparatus used to check the boiling point of water is a thermometer.
True or False?
Impurities tend to raise the melting point of water.
False.
Impurities tend to lower the melting point of water.