Question:
Which of the following is an example of a container that is filled with a pure substance rather than with a mixture?
Answer:
a balloon filled with helium
Question:
Which is the best example of a pure substance?
Answer:
gold
Question:
Why can a small fire be put out by placing a heavy blanket over it?
Answer:
This keeps oxygen from reaching the fire.
Question:
Evidence that living things have evolved over hundreds of millions of years can be found in
Answer:
rocks containing fossils