Elements, Compounds, and Mixtures

Which of the following is the best description of an element?

• A substance that cannot be broken down into simpler substances

• A naturally occurring mineral made of more than one substances

• A small particle made with a specific chemical composition

• A collection of atoms that have different abilities when joined together

Provided is a list of five different substances. How many of these substances are elements?

• 2

• 3

• 4

• 5

Which element makes up most of Earth’s atmosphere?

• Hydrogen

• Carbon

• Oxygen

• Nitrogen

How many of these substances are an example of an element?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How are elements and compounds different?

• A compound is represented by a chemical formula, and elements are represented by a chemical symbol.

• Compounds are represented by chemical symbols of one letter, and elements are represented by symbols of two letters.

• Elements are pure substances, and compounds are not.

• Elements are always larger units of matter, and compounds are smaller.

Tags

NGSS.MS-PS1-1

How many elements are in the compound Fe₂O₃?

• 0

• 1

• 2

• 3

Tags

NGSS.MS-PS1-1

Water is made up of hydrogen and oxygen, two elements that were chemically combined. This makes water a(n)

• atom

• compound

• element

• mixture

Tags

NGSS.MS-PS1-1

__ is a pure substance containing two or more kinds of atoms.

• Element

• compound

• mixture

• solution

Tags

NGSS.MS-PS1-1

Which of the following are both solutions?

• Water and chicken noodle soup

• Baking powder and cornstarch

• milk and household bleach

• lemonade and soda pop

Which of the following is a heterogenous mixture?

• neon

• soil

• steel

• salt water