Chem analysis

What characteristic is used to determine if a substance is pure?

• Its density

• Its specific melting/boiling point

• Its color

• Its solubility in water

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• Yes

• No

How is the Rf (retention factor) value calculated in chromatography?

• Distance mobile phase moved / distance substance moved

• Distance stationary phase moved / distance substance moved

• Distance substance moved / distance mobile phase moved

• Distance from starting line to solvent front

Which gas will relight a glowing splint?

• Hydrogen

• Oxygen

• Carbon Dioxide

• Chlorine

What color flame is produced by lithium ions in a flame test?

• Yellow

• Lilac

• Crimson

• Green

When testing for halide ions, what color precipitate is formed if chloride ions are present?

• Cream

• Yellow

• White

• Blue