Substances and Mixtures

Some substance made of two or more elements that are chemically joined in a specific combination. These are _________.

• compounds.
• homogeneous mixtures.
• heterogeneous mixtures

Which item is a form of matter?

• air
• sound
• gravity

Which item is a substance?

• trail mix
• table salt
• breakfast cereal

What is matter?

• anything that you can see, hear or feel
• anything with mass that takes up space
• anything that can be burned

Which describes the composition of a substance?

• it is always the same
• it is not always the same
• it contains only one type of element

Which is the smallest piece of an element that still represents that element?

• an electron
• an atom
• a molecule

Which is true of the molecules in any compound?

• they contain at least three atoms
• they contain at least two atoms of the same element
• they contain atoms of at least two different elements

Which is the best model for a heterogeneous mixture?

• A
• B
• C
• D