Chemical Tests

Which of the following is a chemical test for the gas oxygen?

• relights a glowing splint

• bleaches damp litmus paper white

• pops with a lit splint

• turns limewater cloudy

Which of the following is a chemical test for the gas hydrogen?

• relights a glowing splint

• turns limewater cloudy

• bleaches damp litmus paper white

• pops with lit splint

A gas turns damp red litmus paper blue. The gas is

• sulfur dioxide, SO2

• oxygen, O2

• ammonia, NH3

• carbon dioxide, CO2

A yellow precipitate formed when an unknown solution is added to silver nitrate and nitric acid indicates the presence of which ion?

• Iodide

• Chloride

• Bromide

• Fluoride

Tags

NGSS.HS-PS1-1

what is the colour sodium gives in flame test?

• red

• green

• yellow

• blue

What is initially observed when sodium hydroxide is added in excess to a solution of Fe²⁺ ions?

• Green precipitate

• Brown precipitate

• Blue precipitate

• White precipitate

When doing a flame test, what element is indicated by a lilac flame?

• Lithium

• Calcium

• Potassium

• Copper

Many ions can be detected in solution by adding another solution and observing the colour of the solid formed. What term is given to a solid formed in a reaction between two solutions?

• Filtrate

• Precipitate

• Residue

• Solution

A positive test for the presence of water shows what colour change for anhydrous copper sulphate

• white to blue

• blue to white

• pink to blue

• blue to pink

Which metal produces an orange-red flame?

• Barium

• Calcium

• Copper

• Lithium