U6 Testing unknown compounds

A flame test identifies ...

• Metals

• Positive metal ions

• Negative metal ions

• Halide ions

The test for a halide ion is to ...

• Add hydrochloric acid followed by silver nitrate solution

• Add sulfuric acid followed by silver nitrate solution

• Add nitric acid followed by silver nitrate solution

• Carry out a flame test

A lilac flame indicates which ion ?

• lithium

• sodium

• potassium

• barium

A red flame indicates which ion ?

• lithium

• sodium

• potassium

• barium

An apple green flame indicates which ion ?

• lithium

• sodium

• potassium

• barium

A brick red / orange flame indicates which ion ?

• lithium

• barium

• potassium

• calcium

What colour precipitate if formed when chloride ions react with silver nitrate solution ?

• yellow

• blue

• cream

• white

What colour precipitate if formed when bromide ions react with silver nitrate solution ?

• yellow

• blue

• cream

• white

What colour precipitate if formed when iodide ions react with silver nitrate solution ?

• yellow

• canary yellow

• cream

• white

What colour flame is observed when copper ions are heated?

• Green

• Blue

• Red

• Yellow