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These can only be separated by chemical means. 

• element 
• compound 
• mixture 
• stuff 

These contain only one kind of atom. 

• element 
• compound 
• mixture 
• water 

The air is a _________. 

• element 
• mixture 
• compound 
• energy 

The things in a mixture always retain their........

• smell properties 
• physical and chemical properties 
• shape 
• color 

Elements can be broken down into simpler substances. 

• false 
• true 
• sometimes 

These must be separated chemically. 

• elements 
• compounds 
• mixtures 
• homogeneous mixtures 

These are mixtures that are the same throughout. 

• homogeneous mixtures 
• heterogeneous mixtures 
• mixed mixtures 

These are mixtures that are not the same throughout. 

• homogeneous mixtures 
• heterogeneous mixtures 
• solutions 
• water 

Milk is a ________

• compound 
• mixture 
• element 

Salt (NaCl) is a _________. 

• compound 
• element 
• mixture