Substances and Mixtures

Substances are classified as acids and bases. The pH scale goes from 0-14. Sodium Hydroxide has a pH of 13. Which of these best describes sodium hyrdoxie?

• strong base

• strong acid

• weak base

• weak acid

Which of the following are pure substances?

• Elements

• Compounds

• Mixtures

• Elements and compounds

• Elements, compounds, and mixtures

How are compounds and mixtures different?

• Compounds are chemically bound while mixtures are physically bound

• Compounds must be chemically separated while mixtures can be physically separated

• Elements in compounds have different properties than by themselves - in mixtures, elements retain their properties

• all of the above

True or False: Compounds contain multiple different types of atoms.

• true

• false

Tags

NGSS.MS-PS1-1

Classify the following as an element, mixture, or compound: Water

• element

• compound

• mixture

Tags

NGSS.MS-PS1-1

Classify the following as an element, compound, or mixture: air

• element

• compound

• mixture

Does this picture show a heterogeneous or homogeneous mixture?

• Heterogeneous

• Homogeneous

• Neither, it is a compound

Which type of substance is always made up of a single type of atom?

• mixture

• element

• compound

What color will Litmus paper turn in an acid?

• red

• blue

What color will Litmus paper turn in a base?

• red

• blue