Use the equation from week 3: f

r

e

q

u

e

n

c

y

=

w

a

v

e

s

p

e

e

d

w

a

v

e

l

e

n

g

t

h

and the wavelength you found in #3 to calculate the frequency of this photon (remember the speed of light is 3E8 m/s):

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?