Elements, Compounds, Mixtures

A pure substance...

• is an element or a compound
• is an element or a mixture
• is a compound or a mixture
• is a mixture

NaHCO₃ is an example of —

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

What is an example of a mixture?

• Table salt
• Salt water
• Oxygen
• Air

A substance made of only one type of atom is called —

• an element
• a mixture
• a compound
• a salt

Which of the following is a way in which elements and compounds are similar?

• Elements and compounds are pure substances.
• Elements and compounds are both made up of different kinds of atoms.
• Elements and compounds can both be broken down by physical means.
• Elements and compounds are listed on the periodic table.

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

Which of these is a pure substance?

• bread
• table salt
• garden soil
• sea water

If an unknown substance CANNOT be broken down into simpler substances, it is 

• a compound
• an element
• a homogeneous mixture
• a heterogeneous mixture

Which of the following atomic symbols is written correctly?

• ee
• hE
• C
• CL