Reactions of Dilute Acid with Metals

What sound is produced when hydrogen burns?

• A pop

• A crackle

• A whistle

• A hiss

What should be the initial volume of dilute hydrochloric acid in the test tube?

• One-tenth full

• One-fifth full

• Completely full

• Half full

Why is zinc foil rubbed with sandpaper before placing it in the test tube?

• To make it shiny

• To remove dirt and oxide coating

• To change its shape

• To increase its weight

What should you observe to confirm gas production in the test tube?

• Movement of the stopper

• Temperature change

• Color change in the solution

• Change in the smell

What is the next step after observing gas bubbles in the test tube?

• Add more zinc foil

• Shake the test tube

• Remove the stopper and test with a burning splint

• Add more hydrochloric acid

Which metals are used to repeat the experiment after zinc?

• Lead, tin, and nickel

• Aluminum, silver, and gold

• Magnesium, iron, and copper

• Platinum, palladium, and rhodium

What should you do with the results of the experiments with different metals?

• Draw a graph

• Discuss them verbally

• Record them in a table

• Ignore them