Chemistry Semester I Final

Which of the following is NOT a physical change?

• grinding
• cutting
• boiling
• burning

According to Dalton's atomic theory, atoms

• are destroyed in chemical reactions
• can be divided
• of each element are identical in size, mass, and other properties
• of different element cannot combine

Nuclear forces exists because the particles in the nucleus are

• oppositely charged
• close together
• highly energized
• moving very fast

For an electron in an atom to change from the ground state to an excited state,

• energy must be released
• energy must be absorbed
• radiation must be emitted
• the electron must make a transition from a higher to a lower energy level

The most characteristic property of the noble gases is that they

• have low boiling points
• are radioactive
• are gases at ordinary temperature
• are largely unreactive

A positive ion is known as a(n)

• ionic radius
• valence electron
• cation
• anion

Matter includes all of the following EXCEPT

• air
• light
• smoke
• water vapor

What Charge Does a Proton Have?

• Positive
• Negitive
• Neutral
• Wild

The only pure substance listed below is

• bread dough
• seawater
• vitamin C
• vinegar

Which of the following is an example of a homogeneous mixture?

• air
• marble
• raw milk
• orange juice with pulp