Chemical Tests Flashcards
What is the test for hydrogen gas?
A burning splint held at the open end of a test tube of the gas produces a squeaky pop sound.
What indicates the presence of oxygen in a gas test?
A glowing splint inserted into the gas relights.
How is carbon dioxide identified?
By shaking it with or bubbling it through lime water, which turns milky.
What happens to litmus paper in the presence of chlorine gas?
Damp litmus paper is bleached and turns white.
What distinctive flame color does lithium produce?
Crimson flame.
What flame color is produced by sodium compounds?
Yellow flame.
What color flame results from potassium compounds?
Lilac flame.
What flame color does calcium produce?
Orange-red flame.
What color flame is produced by copper compounds?
Green flame.
What effect can a mixture of ions have on flame tests?
Some flame colors can be masked.
What is the role of sodium hydroxide solution in identifying metal ions?
It forms precipitates with certain metal ions.
What precipitate forms when aluminium, calcium, or magnesium ions are treated with sodium hydroxide?
White precipitates.
Which aluminium hydroxide precipitate behavior is unique?
It dissolves in excess sodium hydroxide solution.
What colored precipitate does copper(II) ions form with sodium hydroxide?
Blue precipitate.
What color precipitate does iron(II) ions form?
Green precipitate.
What color precipitate is formed by iron(III) ions?
Brown precipitate.
What do carbonates produce when they react with dilute acids?
Carbon dioxide gas.
What is the result of halide ions reacting with silver nitrate solution?
Precipitates of different colors: white (chloride), cream (bromide), yellow (iodide).
What precipitate do sulfate ions form with barium chloride solution?
White precipitate in the presence of dilute hydrochloric acid.
