Material properties

1. Which observation(s) might be used as evidence that a chemical reaction occurred?

• Color change

• Odor change

• Properties change

• All of the above

________ result(s) in no new substances.

• A physical change

• A chemical change

• Physical and chemical changes

• None of the above

Which is an example of a physical change?

• Burning wood

• Freezing water

• Rust on a car

• Cooking food

Which is an example of a chemical change?

• Burning wood

• Burning wood

• Burning wood

• All of the above

If you start a chemical reaction with 5 atoms of helium, how many atoms will you have after?

• 4 atoms

• 10 atoms

• 5 atoms

• 1 atom

Which of the following describes a precipitate?

• Which of the following describes a precipitate?

• a solid forms when one liquid is poured into another

• a gas forms when a solid is placed in a liquid

• bubbles form when an acid is poured on a rock

Digesting your food is an example of

• chemical change

• physical change

Some hydrochloric acid is added to calcium carbonate in a test tube. The students observed bubbles and fizzing. The gas is ....

• oxygen

• nitrogen

• carbon dioxide

• hydrogen

In the above reaction, to test for the gas I could ...

• Bubble it through limewater and it will go milky

• do the pop test and it will burn

• Light a taper and it will burn brighter

• note the colour change to yellow

In another reaction, the student places a piece of metal into a test tube and adds an acid again. Its fizzes ..

The gas produced is called...

• carbon dioxide

• hydrogen

• oxygen

• helium