Chemistry Review

The electron

100

An electron has a charge of 

-1

200

Electrons are responsible for the ____________ properties of an atom.

chemical

300

When hight energy light hits a sheet of metal, some electrons are ejected. This is called the ________________ __________________.

photoelectric effect

400

Electrons have some properties of ____________.

waves

500

Lithium burns red because electrons jump to their __________ state, and when they fall to their ________ state they release ________. The ________ of light depends on how far the electron fell. 

excited, ground, photons, color

Significant Figures

100

How many sig figs are in the following?

8008

4

200

How many sig figs are in the following? 000.00820

3

300

How many sig figs are in the following? 

1.20x10³

3

400

How many sig figs are in the following? 

100.0

4

500

how many significant figures will be in your final answer for the following operation? 

100x1928.000

1

Dual Nature of Light

100

What do you call a particle of light?

a photon

200

Your friend is trying to find the energy of a photon. Should he treat light as a wave or a particle?

Wave, he will use the wavelength 

300

The dual nature of light says that light acts like a __________ and a ______________.

wave, particle

400

Refraction, reflection, and dispersion occur when light acts as a 

wave

500

The photoelectric effect occurs when light acts as a _______________.

particle

Equations etc

100

What do the following letters stand for? 

c

h 

c= speed of light 

h= Planck's constant 

200

Find the wavelength of light with a frequency of 2x10²⁰ Hz.

1.5x10^-12 m

300

List the 4 equations for this unit.

E=mc²

Change in E=n x h x frequency

Energy of a photon= hc/wavelength 

speed= wavelength x frequency

400

Find the energy of a photon with a wavelength of 1.2x10^-7m.

1.7x10^-18 J

500

Calculate the change in energy of a a quanta of light with a wavelength of 1.6x10^-8 m.

1.2x10^-17J

Random

100

what is the value of plank's constant?

6.626x10^-34Jxs

200

What is the speed of light?

3.00x10⁸m/s

300

Electrons exist in ___________ ______________.

Energy levels 

400

The wavelength and color of light released by an atom depends on the ____________ in energy between energy levels.

difference

500

Explain the dual nature of light.

Light can act as a wave or it can act as a particle.