Exam Review: Chemistry Concepts

Electrons have a ​ (a)   charge.

• negative
• positive
• neutral

Protons have a ​ (a)   charge.

• negative
• positive
• neutral

Neutrons have a ​ (a)   charge.

• negative
• positive
• neutral

The nucleus of an atom contains:

• Protons and Electrons

• Neutrons and Electrons

• Protons and Neutrons

In chemistry, light is a synonym for

• energy

• color

• charge

• heat

Electrons that jump to the excited state remain there forever.

• True

• False

Answer explanation

After an electron jumps to the excited it ALWAYS releases the energy and returns to it's original ground state.

An electron that has not absorbed any energy is in the

• ground state

• excited state

• tired state

• neutral state

Electrons absorb bundles of energy called

• excited state

• light

• quanta

• heat

Electrons only absorb exact quanta (for example: and electron would ignore 2.5 quanta of energy, but would absorb 2 or 3 quanta).

• True

• False

Answer explanation

Electrons will only absorb quanta in exact amounts. Think of it like climbing a staircase. You can go up one step, or 5 steps if you want, but it is not possible to go up half a step.

Match the absorption/emission of quanta with the appropriate change in energy level.

• Jump up 3 energy levels

• Emit 1 quanta

• Jump down 6 energy levels

• Absorb 2 quanta

• Jump up 2 energy levels

• Emit 6 quanta

• Jump up 5 energy levels

• Absorb 5 quanta

• Jump down 1 energy level

• Absorb 3 quanta