Elements, Compounds & Mixtures

The smallest part of an element that retains the properties of the element is the

• nucleus.

• electron

• atom

• neutron

Which is the best example of a pure substance?

• pizza

• gold

• saltwater

• air

What kind of substance is composed of two or more elements that are chemically combined?

• element

• mixture

• solution

• compound

If a substance is composed of one kind of atoms arranged, how is this substance best classified?

• element

• compound

• mixture

• solution

NaHCO₃ is an example of —

• an abbreviation
• a compound
• a mixture
• an element

What is an example of a mixture?

• Water

• Hydrogen gas

• Oxygen gas

• Air

What is an example of an element?

• Oxygen
• Pure water
• Air
• Table salt

Two or more substances in the same place but NOT chemically combined or in a specific ratio is called —

• a compound 
• a pure substance
• an element
• a mixture

What is aluminum (Al)?

• Element

• Compound

• Mixture

What is water (H₂O)?

• Element

• Compound

• Mixture