Chemistry Unit Review 2- Shortened

Which of the following describes a mixture?

• Formed from two or more substances chemically combined

• Made up of two or more substances joined in a specific ratio

• Made up of two or more substances that keep their identities

• Can be separated only by chemical means

The difference between elements and compounds is that...

• elements can be separated by physical means and compounds cannot.
• elements cannot be separated by physical means and compounds can.
• elements contain only one kind of atom and compounds contain more than one kind of atom.
• elements contain more than one kind of atom and compounds contain only one kind of atom.

Which of these is a pure substance?

• bread
• table salt
• garden soil
• sea water

Elements in the same ________ are more chemically similar.

• group
• period
• club
• table

Which family of metals would be the most reactive?

• Alkali Metals
• Transition Metals
• Alkaline Earth Metals
• Full Metal Jacket

Which is a noble gas?

• Fluorine
• Hydrogen
• Iodine
• Krypton (Kr)

Name the group that contains inert (nonreactive) elements.

• noble gases
• halogens
• alkali metals
• alkaline earth metals

Which of the following is a pure substance? 

• Water
• Salad
• Chocolate milk
• All of them 

Max is hungry and he prepares cereal with milk. This is an example of a: 

• Homogeneous mixture
• Heterogeneous mixture

A pure substance that cannot be broken down into other substances by chemical or physical means. 

• compound          
• atom
• mixture 
• element