Chemistry Extra Credit

Which of the following are considered physical properties of a substance?

• color and odor

• melting and boiling points

• malleability and hardness

• all of the above

A vapor is which state of matter?

• solid

• liquid

• gas

• all of the above

Which state of matter takes both the shape and volume of its container?

• solid

• liquid

• gas

• both liquid and gas

Which state of matter is characterized by having a definite shape and a definite volume?

• gas

• liquid

• solid

• all of the above

Which of the following is a heterogeneous mixture?

• air

• salt water

• steel

• soil

Which of the following is a chemical property?

• color

• hardness

• freezing point

• ability to react with oxygen

What group on the periodic table contains one valence electron?

• alkali metals

• noble gases

• halogens

• transition metals

Three different people weigh a standard mass of 2.00 g on same balance. Each person obtains a reading of 7.32 g for the mass of the standard. These results imply that the balance was

• accurate

• precise

• accurate and precise

• neither accurate nor precise

How many significant figures are in the measurement 40,500 mg?

• two

• three

• four

• five

How many significant figrues are in the measurement 811.40 g?

• two

• three

• four

• five