Maria's Science Experiment Quiz

What did Maria use to make a dull penny shiny again?

• Vinegar and salt

• Water and soap

• Lemon juice and baking soda

• Oil and sugar

What is the weight of the dull, brown 1 Euro cent coin before any experiments?

What did Maria use to scratch the coin?

• A brush

• A piece of sandpaper

• A knife

• A cloth

What was the weight of the shiny coin after Maria scratched it?

• 2.0 grams

• 2.1 grams

• 2.2 grams

• 2.3 grams

What was the weight of the dull, brown bits after Maria scratched the coin?

• 0.1 grams

• 0.2 grams

• 0.3 grams

• 0.4 grams

When the sandpaper scratched the coin, it added new, shiny stuff onto the coin. The shiny stuff made the coin heavier.

• True

• False

The little brown bits were probably scratched off of the coin. That’s why the weight of the coin went down.

• True

• False

The sandpaper made the coin shiny, but nothing was added to it or scratched off of it. The dull, brown bits probably came from the sandpaper instead.

• True

• False

After 1 minute, the dull, brown bits are no longer visible. They aren’t in the tub at all any more. They’re totally gone! That’s why the total weight went down, and that’s why Maria couldn’t see them anymore.

• True

• False

After 1 minute, the dull, brown bits broke down into tinier and tinier pieces. Those tiny pieces were too small to see, but they were still in the tub. The weight went up because there were so many teeny tiny pieces.

• True

• False