EL C1b Assessment

Look at the Chromatogram, which substance is a pure substance?

• X

• A

• B

• C

Which two dyes are used to make Ink X?

• B and C

• B and A

• C and A

• None of them

A student reacts excess magnesium with dilute hydrochloric acid to form a salt. When magnesium is added to the dilute hydrochloric acid the salt form is...

• Magnesium Hydride

• Magnesium Sulfate

• Magnesium Hydroxide

• Magnesium Chloride

The formula for Hydrochloric acid is?

• HCl2

• HCl

• HOCl

• HC

How do we test for hydrogen?

• Bubble the gas through lime water

• Put a lit split in a test tube of the gas

• Put a glowing splint into a test of the gas

• Use litmus paper

If we put a lit splint into a test tube of hydrogen how do we know hydrogen is present?

• Nothing will happen

• A cloudy gas will form

• The splint will go out

• We will here a squeeky pop

If we add an excess of magnesium to dilute hydrochloric acid, how can we remove the excess?

• Crystallisation

• Filtration

• Simple distillation

• Evaporation

Aluminium is extracted from its ore by...

• Heating with Carbon

• Filtration

• Electrolysis

• Burning

Aluminium is used for aeroplanes because...

• Low melting point

• Good electrical conductor

• Shiny

• Low density

Copper is used for household wiring because...

• Low melting point

• Good electrical conductor

• Shiny

• Low density