Chemical analysis quiz

What is a pure substance?

• A) A mixture of two or more substances, not chemically joined together

• B) A single element or compound not mixed with any other substance

• C) A mixture that has been designed as a useful product

• D) The temperature at which a substance melts

What is the melting point of a substance?

• A) The temperature at which a substance boils

• B) The ratio of the distance moved by a compound to the distance moved by the solvent

• C) The temperature at which a substance melts

• D) A technique used to separate mixtures

What is chromatography used for?

• A) To determine the boiling point of a substance

• B) To measure the melting point of a substance

• C) To separate mixtures

• D) To combine different substances

What happens to a glowing splint when it is placed in a test tube of oxygen?

• A) It produces a squeaky pop

• B) It turns cloudy/milky

• C) It re-lights

• D) It bleaches to white

What is the stationary phase in chromatography?

• A) The solvent (liquid) that moves through the paper

• B) The ratio of the distance moved by a compound to the distance moved by the solvent

• C) The material the sample and solvent pass through, but which doesn't move itself

• D) The temperature at which a substance boils

What is the Rf value in chromatography?

• A) The temperature at which a substance melts

• B) The technique used to separate mixtures

• C) The ratio of the distance moved by a compound (centre of spot from origin) to the distance moved by the solvent

• D) The solvent (liquid) that moves through the paper

What test is used to confirm the presence of hydrogen gas?

• A) Re lights a glowing splint

• B) Lit split that makes a squeeky pop

• C) Lime Water turns cloudy

• D) Damp blue litmus paper bleaches white

What is the result of the carbon dioxide gas test?

• A) Re-lights a glowing splint

• B) Squeaky pop

• C) Limewater turns cloudy/milky

• D) Damp blue litmus bleaches to white

What happens to damp litmus paper when it is exposed to chlorine gas?

• A) It re-lights

• B) It produces a squeaky pop

• C) It turns cloudy/milky

• D) It bleaches to white