Carbon atoms and oxygen atoms can combine to form the gas called carbon dioxide. Carbon dioxide:

• is an atom

• is a molecule

• is not matter

Tags

NGSS.MS-PS1-1

True or False:  Both elements and compounds are pure substances.

• true
• false

Carbon, hydrogen, and oxygen are chemically joined together to form sugar. Sugar has properties that are different from the elements that it is made of. Sugar is a(n):

• element
• compound
• mixture
• all of the above

Tags

NGSS.MS-PS1-1

Lakewater contains water, dirt, small organisms, and dissolved gases. Each substance in the lakewater keeps their own properties.  Lakewater is a(n):

• element
• compound
• mixture
• all of the above

Which of the following is an element?

• salt
• sugar
• sodium
• water

Soil, Air, and Saltwater are each examples of:

• elements
• compounds
• mixtures

The circles in Box A represent pure substances that cannot be broken down into a simpler form. What are these substances? 

• elements
• compounds
• mixtures
• solutions

Tags

NGSS.MS-PS1-1

Box C above represents a compound. This is different from the other two boxes because it: 

• is created by mixing elements together. 
• consists of more than one element. 
• it has different elements chemically bonded together

• does not include any elements. 

Tags

NGSS.MS-PS1-1

The chemical formula for sugar is C₆H₁₂O₆. What elements make up this compound?

• Carbon, halogen, and argon
• Carbon, nitrogen, and oxygen
• carbon, hydrogen, and oxygen
• carbon, helium, and oxides

Tags

NGSS.MS-PS1-1

Subscripts in a chemical formula show:

• how many different elements are in the formula.
• how many of each kind of atom are in the compound.
• the number of molecules of the substance.
• the steps necessary to divide components of a mixture.