Reaction of metals

What are the products when sodium reacts with water?

• sodium hydroxide, hydrogen

• sodium oxide,

  hydrogen

• sodium oxide,

  oxygen

• sodium hydroxide, oxygen

In which row are the elements placed in the correct order of their chemical reactivity, starting with the most reactive element?

• A

• B

• C

• D

What are the products when magnesium reacts with steam?

• magnesium oxide, hydrogen gas

• magnesium hydroxide, hydrogen gas

• magnesium oxide, water

• magnesium hydroxide, water

Which metal will displace hydrogen from aqueous solutions of acids but not from cold water?

• Potassium

• copper

• sodium

• zinc

The element chromium liberates hydrogen from dilute hydrochloric acid although it does not react with cold water.

When a piece of chromium is placed in lead(II) nitrate solution, crystals of lead appear.

What is the order of decreasing reactivity of the metals lead, calcium and chromium?

• calcium, chromium, lead

• calcium, lead, chromium

• chromium, calcium, lead

• lead, chromium, calcium

Which metal can react rapidly with steam, but reacts only very slowly with cold water?

• Magnesium

• copper

• Silver

• potassium

Substance P reacts with dilute hydrochloric acid to produce a gas. This gas reduces substance Q. What are substances P and Q?

• P - copper

  Q - copper (II) oxide

• P - lead

  Q - lead (II) oxide

• P - magnesium

  Q - zinc oxide

• P - zinc

  Q - copper (II) oxide

What is the name of salt produce when aluminium reacts with hydrochloric acid?

  Which pair of reagents will undergo a displacement reaction?

• Ag(s) and CuSO₄(aq)

• Cu(s) and MgSO₄(aq)

• Mg(s) and CaSO₄(aq)

• Zn(s) and CuSO₄(aq)

1. When magnesium powder is added to aqueous iron(II) sulfate, the following reaction occurs.  

Mg(s) + Fe²⁺(aq) 🡪  Mg²⁺(aq) + Fe(s) 
What would you observe in this reaction?