Test Review - Elements, compounds, physical changes, and chemical changes

Which of the following represents an element? *Elements have ONE capital letter.

• H₂O

• H₂

• NaCl

• CaCO₃

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

How many elements (count the capital letters) are represented in the compound? Na₂CO₃

• 1

• 2

• 3

• 4

Count the capital letters to determine the number of elements.

• 1

• 2

• 3

• 4

Which of the following contain only one kind of atom?

• element

• compound

• mixture

• water

Is water an element or a compound?

• Element
• Compound

Tags

NGSS.MS-PS1-1

The chemical equation shown below represents a reaction that produces fuel for certain cars.

CO + H₂O------->CO₂ + H₂

_{Which substance in this equation is classified as an element?}

• CO

• H₂O

• CO₂

• H₂

This image is a model of...

• an element

• a compound

• a mixture

This picture represents which of the following?

• element
• compound
• mixture

Tags

NGSS.MS-PS1-1

What is the picture displayed?

• an element

• a compound

• a mixture