Chem. 605 Mock Test (24 mins.)

True or false?

1. Pure substances can be categorised into elements and compounds

• True

• False

2. Which of the following is a correct description of pure substances?

• Pure substances can have different compositions

• Pure substances have a constant composition, which contains only one substance with no other substances mixed together

3. Which of the following is an example of pure substances?

• A container which contains only iron atoms

• A container which contains sulphur, hydrogen, and magnesium atoms

True or false?

4. Pure substances have a constant colour, density, appearance, melting point, and boiling point

• True

• False

True or false?

5. Pure substances can be broken down into more simpler substances by using physical processes like distillation and filtration

• True

• False

6. Provide two ways to identify a pure substance:

True or false?

7. Mixtures are a combination of two or more pure substances

• True

• False

True or false?

8. Mixtures do not have constant boiling points and melting points. Also, they can be mixed in any ratio

• True

• False

True or false?

9. Mixtures cannot be broken down into more simpler substances, whether physically or mechanically

• True

• False

10. Which of the following is a correct description of homogenous mixtures and heterogenous mixtures?

• Homogenous mixtures have consistent composition throughout. Heterogenous mixtures have different composition throughout.

• Homogenous mixtures have different composition throughout. Heterogenous mixtures have consistent composition throughout.