Pure Substances and Mixtures

___________ are the smallest unit of an element that maintains the properties of that element.

• Atoms

• Elements

• Compounds

• Mixtures

What is this?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Chicken noodle soup

• heterogeneous mixture

• homogeneous mixture

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

• compound

• atom

• mixture

• element

Which of these is an element?

• Salt (NaCl)

• Water (H20)

• Oxygen (O)

• Carbon Dioxide (CO2)

Which of these is a compound?

• Aluminium (Al)

• Carbon Dioxide (CO2)

• Nitrogen (N)

• Sand

Which of these is a mixture?

• Laundry Detergent

• Salt (NaCl)

• Oxygen (O)

• Fluorine (Fl)

Air is:

• An element

• A compound

• A mixture

• None of these

A _____________ contains a variety of elements and compounds that are not chemically combined with each other.

• compound

• element

• molecule

• mixture

A _________________ mixture is one where the substances are evenly spread throughout.

• heterogeneous

• homogeneous

• pure substance