Quarter 1 Exam / Midterm PART 1

Match it! Select the correct answer from the pull down...Good luck!

What is an atom?

A measure of the energy of random motion in a substance’s molecule.

A metal plaque by the front entrance to our nation’s Capitol in Washington D.C. commemorates the building’s completion in 1826. The plaque is bluish-green in color. What kind of metal is the plaque made of?

two or more atoms linked together to make a substance with unique properties

The upper level of the atmosphere where the concentration of the air is very DIFFERENT from the air at sea-level

The lower layer of the atmosphere, where the concentration of the air is the SAME as the air at sea-level

Narrow bands of high-speed winds that circle the earth, blowing from west to east

The number of molecules of a substance in a mixture for every 1 million molecules in that mixture.