Pure substances and Mixtures Questions

What are the two main categories into which matter can be classified?

• Elements and Compounds

• Pure substances and Mixtures

• Homogeneous and Heterogeneous

• Metals and Nonmetals

A pure substance is a type of matter that has a ______ composition and distinct properties.

• fixed

• variable

• random

• changing

Which of the following is an example of an element?

• Water (H2O)

• Table salt (NaCl)

• Oxygen (O)

• Carbon dioxide (CO2)

Elements are the simplest pure substances.

• True

• False

Compounds can be broken down into their elements only by ______ means, not by physical processes.

• chemical

• mechanical

• physical

• magnetic

Tags

NGSS.MS-PS1-5

Which of the following is a compound?

• Iron (Fe)

• Gold (Au)

• Water (H2O)

• Hydrogen (H)

Tags

NGSS.MS-PS1-1

A mixture is a combination of two or more substances that are not ______ combined.

• chemically

• physically

• mechanically

• visually

Homogeneous mixtures are also called ______.

• solutions

• compounds

• elements

• colloids

What is an example of a homogeneous mixture?

• Salad

• Sand and iron filings

• Salt water

• Trail mix

A heterogeneous mixture is one in which the composition is not uniform throughout.

• True

• False