Pure Substances and Mixtures

William is sorting materials in a science lab. He finds a sample of pure gold (an element) and a sample of pure water (a compound). True or False: both of these are pure substances.

• True

• False

Which type of mixture has parts that are easily identified?

• heterogeneous

• homogeneous

Hannah is making a drink by mixing sugar into water. After stirring, she cannot see the sugar anymore. In which type of mixture can you not see all of the parts?

• heterogeneous

• homogeneous

A substance in which all of the parts are the same throughout

• element

• homogeneous

• heterogeneous

• pure substance

Classify the substance: pizza.

• compound

• mixture

• element

Water (H₂O) would be considered a(n)

• element

• compound

Tags

NGSS.MS-PS1-1

Silver (Ag) would be considered a(n)

• element

• compound

Charlotte is looking at a gold ring and learns that it is made of only one type of atom. What is this substance called?

• a compound

• an element

• a salt

• a mixture

Aluminum foil is made of only one type of atom: aluminum atoms. How would you classify aluminum?

• it is NOT a type of matter

• it is a compound which is a type of mixture

• it is a homogeneous mixture which is a type of matter

• it is a pure substance which is a type of matter

Which of the following is an example of a heterogeneous mixture?

• salt water

• chicken noodle soup

• vinegar

• orange juice (without pulp)