Acids And Metals

Question 1

Zinc reacted with hydrochloric acid. The reaction made zinc chloride.

Answer 1

Zinc + hydrochloric acid —> zinc chloride + hydrogen

Question 2

Other metals react with acids

Answer 2

Anna pours dilute hydrochloric acid into a test tube. She adds magnesium ribbon. The mixture bubbles vigorously. The ribbon gets smaller and dissapears. A colourless solution remains. There has been a chemical reaction: magnesium + hydrochloric acid —> magnesium chloride + hydrogen. Zinc and iron bubbles steadily with acid. Lead reacts more slowly.

Question 3

All the reactions make a solution of a salt and hydrogen gas:

Answer 3

Zinc + hydrochloric acid —> zinc chloride + hydrogen
Iron + hydrochloric acid —> iron chloride + hydrogen
Lead + hydrochloric acid —> lead chloride + hydrogen

Question 4

How can you tell if the bubbles contain hydrogen gas ?

Answer 4

Collect the gas by holding an empty test tube above the reaction test tube. Light a splint. Hold the splint in the test tube that now contains the gas. Listen. If the splint goes out with a squeaky pop the gas is hydrogen. The squeaky pop happens because hydrogen and oxygen react explosively. The product is water.
Hydrogen + oxygen —> water