Reactivity of Metals with Acids

The video demonstrates the reactions of calcium, magnesium, zinc, and copper with water and hydrochloric acid. Calcium reacts vigorously with both, while magnesium shows moderate reaction with acid. Zinc and copper show no reaction with either. The reactivity order is calcium, magnesium, zinc, and copper. Equal volumes of water and acid are used for fair testing.

Which metals are being tested for their reaction with water in the experiment?

• Sodium, Potassium, Lithium, Barium

• Iron, Lead, Silver, Gold

• Aluminum, Tin, Nickel, Cobalt

• Calcium, Magnesium, Zinc, Copper

What is observed when calcium reacts with water?

• No reaction

• Vigorous reaction

• Slow reaction

• Explosion

How does magnesium react with water compared to calcium?

• No reaction

• Less vigorously

• More vigorously

• Explosively

What is the purpose of using hydrochloric acid in the second part of the experiment?

• To observe reactions with a stronger acid

• To compare with reactions in air

• To neutralize the metals

• To dissolve the metals completely

Which metal shows no reaction with hydrochloric acid?

• Zinc

• Calcium

• Magnesium

• Copper

How does the reaction of magnesium with hydrochloric acid compare to its reaction with water?

• No reaction with hydrochloric acid

• Less vigorous with hydrochloric acid

• More vigorous with hydrochloric acid

• Explosive with hydrochloric acid

What gas is given off when calcium reacts with hydrochloric acid?

• Nitrogen

• Hydrogen

• Oxygen

• Carbon dioxide

In what order do the metals react from most to least reactive?

• Magnesium, Calcium, Copper, Zinc

• Zinc, Copper, Magnesium, Calcium

• Calcium, Magnesium, Zinc, Copper

• Copper, Zinc, Magnesium, Calcium

What conditions were kept constant during the experiments?

• Volume of water and acid, mass of metals

• Temperature and pressure

• Type of container and stirring speed

• Time of reaction and light exposure