Element, Compound and Mixture quiz

1. Which statement identifies why oxygen is classified as a pure substance and air is classified as a mixture?

• Oxygen is more reactive than air.

• Oxygen has a higher density than air.

• Oxygen goes under a phase change, whereas air is always a gas.

• Oxygen contains only one substance, but air contains several substances.

2. A pure substance that cannot be broken down into other substances by chemical or physical means. 

• compound    

• element

• mixture

• atom

3. Which of these is an element?

• Salt (NaCl)

• Oxygen (O)

• Water (H20)

• Carbon Dioxide (CO2)

4. Which of these is a compound?

• Aluminium (Al)

• Nitrogen (N)

• Carbon Dioxide (CO2)

• Sand

Tags

NGSS.MS-PS1-1

5. Which of the following is an example of the formation of a mixture?

• Rust forming on an iron nail.

• Sugar crystals dissolving in water.

• Sodium and chlorine forming table salt.

• Hydrogen and oxygen reacting to produce oxygen.

6. When electricity passes through water, hydrogen and oxygen are produced. Which table correctly labels the compounds and elements involved in the process?

• Water-->Compound

  Hydrogen-->Compound

  Oxygen--->Element

• Water--->Compound

  Hydrogen--->Element

  Oxygen--->Element

• Water-->Compound

  Hydrogen--->Element

  Oxygen--->Compound

Tags

NGSS.MS-PS1-1

7. Jorge prepared a drink and salad for dinner. The chart lists the ingredients for both. Using the information in the chart, which statement is the BEST description of the drink and salad?

• The salad and fruit drink are both mixtures.

• The fruit drink is a mixture because the ingredients can't be separated.

• The salad and the fruit drink are both solutions.

• The salad is a solution because the ingredients can't be separated.

8. Which of the following is an example of of a container filled with a pure substance rather than with a mixture?

• A tire filled with air.

• A balloon filled with helium.

• A jar filled with salt water.

• A glass filled with chocolate milk.

9. Water (H₂O), is not found on the periodic table because water is a...

• atom

• element

• mixture

• compound

Tags

NGSS.MS-PS1-1

10. This diagram represents a _____.

• pure substance that is a compound

• pure substance that is an element

• mixture of elements

• mixture of compounds

Tags

NGSS.MS-PS1-1