testing for ions and gases Flashcards
Anna tests chemical X in a flame test. The flame is orange. Which cation is it?
sodium
Mary adds sodium hydroxide to solution Y and warm I up. Moist red litmus paper turns blue. Which cation is in Y?
ammonium
Isabelle has made a gas. She adds moist litmus paper. The paper turns red and then bleaches. Which gas has she made?
chlorine
Henry does a flame test. The colour is red. Which cation is it?
lithium
Tina has produced a gas. She tests it with a glowing splint which relights. Which gas has she produced?
oxygen
Dr Haywood investigates a salt; The flame test produces a brick red flame. When she adds hydrochloric acid the solution starts to fizz. Which salt is in the solution?
calcium carbonate
Mrs Jones adds sodium hydroxide to a salt solution and a green precipitate forms. What is the cation?
iron (II) or Fe2+
Copper turns a flame green. Describe another test for copper ions and its outcome.
add sodium hydroxide to a solution of the salt. It produces a blue precipitate
Salt Z produces a lilac flame and a white precipitate when acidified barium chloride is added. What is the salt?
potassium sulfate
Salt Z produces a lilac flame and a white precipitate when acidified barium chloride is added. What is the name of the precipitate?
barium sulfate
Salt P produces an orange flame and a yellow precipitate when acidified silver nitrate is added to a solution of P. What is the name of the salt?
sodium iodide
Salt P produces an orange flame and a yellow precipitate when acidified silver nitrate is added to a solution of P. What is the name of the precipitate?
silver iodide
Salt G produces a white precipitate when acidified silver nitrate is added to a solution and an orange/brown precipitate when sodium hydroxide is added. What is the symbol formula of this salt?
FeCl3
Sodium hydroxide is added to a solution of salt M and when heated it turns red, moist litmus paper blue. When acidified silver nitrate is added to a fresh solution a cream coloured precipitate is made. What is the name of salt M?
ammonium bromide
Sodium hydroxide is added to a solution of salt M and when heated it turns red, moist litmus paper blue. When acidified silver nitrate is added to a fresh solution a cream coloured precipitate is made. What is the name of the precipitate?
silver bromide
Tommy produces a gas. He thinks it is carbon dioxide. What is the test for CO2 and its positive outcome?
add lime water, turns cloudy
A salt solution produces a white precipitate when acidified barium chloride is added and it produces an orange/brown precipitate when sodium hydroxide is added. What is the exact name of the salt?
iron(III)sulfate
Mary produces a gas. Using a lit splint it makes a squeaky pop. Which gas is it?
hydrogen
Jonah heats up a solution. A moist red litmus paper turns blue. Which gas was given off?
ammonia, not ammonium
Mark adds sodium hydroxide into a salt solution and a green precipitate is formed. Into a fresh salt solution he adds hydrochloric acid. The solution starts to fizz. What is the exact name of the salt?
iron (II) carbonate
Mark adds sodium hydroxide into a salt solution and a green precipitate is formed. What is the exact name of the precipitate?
iron (II) hydroxide
Mark adds sodium hydroxide into a salt solution and a green precipitate is formed. What is the symbol formula of the precipitate?
Fe(OH)2
Describe the test for copper 2+ ions and its positive outcome
add an alkali/hydroxide, blue precipitate forms
Describe the test for bromide ions and its positive outcome
add acidified silver nitrate, cream precipitate forms
