CHEMISTRY YEAR 8 2ND TERM

Which metal is found uncombined in the Earth’s crust?

• Gold

• potassium

• Zinc

• Magnesium

Which statement about the reactivity series is correct?

• Metals at the bottom of the reactivity series are more reactive than metals at the top

• Metals at the top of the series are more reactive than metals at the bottom

• Metals in the series are not arrange in any particular order.

• None of the above

When an iron nail is placed into copper(ii) sulphate, what would happen to the nail over time?

• A silver coating would appear around the nail

• A brown coating would appear around the nail

• The nail would disappear

• The nail will turn blue

Which of the following metals can displace the rest from their salt solution?

• Copper

• Zinc

• Silver

• Gold

Which of the following changes will be observed, when a copper wire is dipped into an aqueous solution of silver nitrate for some time?

• The colour of the solution changes from blue to colourless and a silver solid deposits on copper wire.

• The colour of the solution changes from blue to colourless and a brown solid deposits on copper wire

• The colour of the solution changes from colourless to blue and a silver solid deposits on copper wire.

• None of the above

Which of the following metals can displace the rest from their salt solution?

• Copper

• Iron

• Silver

• Zinc

Which of the metals listed in the options is the least reactive element?

• Gold

• Iron

• Copper

• Magnesium

Three metal compounds, P, Q and R, are heated using a Bunsen burner. The results are shown. P colourless gas produced, which relights a glowing splint Q colourless gas produced, which turns limewater milky R no reaction Which row shows the identity of P, Q and R?

• magnesium carbonate potassium carbonate potassium nitrate

• magnesium carbonate potassium nitrate potassium carbonate

• potassium nitrate magnesium carbonate potassium carbonate

• potassium nitrate potassium carbonate magnesium carbonate

Food cans are coated with tin and not with zinc because:

• Zinc is costlier than tin

• Zinc has a higher melting point than tin

• Zinc is more reactive than tin

• Zinc is less reactive than tin

Which of these elements burns with a white flame?

• Sodium

• Magnesium

• Copper

• Calcium