Elements, Compounds & Mixtures

Pure substances that cannot be separated into simpler substances by chemical or physical means are... 

• Elements only
• Compounds only
• Mixtures
• Elements and Compounds

These contain only one kind of atom. 

• element 
• compound 
• mixture 
• water 

Compounds are pure substances that are made of identical....

• mixtures
• atoms 
• molecules
• protons

A compound is made of ________ atoms. 

• big 
• similar 
• different 

Tags

NGSS.MS-PS1-1

Which of the following is an example of a mixture?

• sugar
• water 
• carbon dioxide
• Salad Dressing

Reactant A and Reactant B undergo a chemical reaction to form Product C.  What is the difference between Reactant A and Product C?

• Reactant A is a compound and Product C is an element.
• Reactant A is a mixture and Product C is an element.
• Reactant A is an element and Product C is a compound.
• Reactant A is a compound and Product C is a mixture.

Which of the following represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

Which of the following is not a compound?

• HCl
• Cl
• NaCl
• CO2

Tags

NGSS.MS-PS1-1

Salt water boils and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?

• Compound
• Element
• Mixture
• None of the Above

Tags

NGSS.MS-PS1-4

A combination of substances that are not chemically combined is called a(n)____________. 

• mixture
• compound
• physical