Pure substances and Mixtures

Select all of the particle diagrams that represent a pure substance.

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Which of the following is an element?

• HCl

• MgBr

• Cu(SO4)3

• O

Water, also known as H2O, cannot be separated into hydrogen and oxygen. Why?

• H2O cannot be separated into hydrogen and oxygen because it is a mixture that is physically combined.

• H2O cannot be separated into hydrogen and oxygen because it is a mixture that is chemically combined.

• H2O cannot be separated into hydrogen and oxygen because it is a chemically combined compound.

• H2O cannot be separated into hydrogen and oxygen because it is a physically combined compound.

Daniella made a mistake on her table. Which best describes the mistake she made?

• Pure substances can be separated using physical means.

• Elements and compounds are considered mixtures.

• Mixtures are substances that are not chemically combined.

• Mixtures contain at least three or more substances.

Is this a Compound or Mixture?

• Compound

• Mixture

Is this a Compound or Mixture?

• Mixture

• Compound

Is H2O a Pure substance or Mixture?

• Mixture

• Pure substance

Is a pencil a Pure substance or Mixture?

• Mixture

• Pure substance

Which are compounds

• HF

• KI

• CO

• all of the above