What is a physical property of copper?
a. it reacts in acid.
b. it sometimes turns green.
c. it boils at a very high temperature.
d. it will combine with some nonmetals.

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

In which phase(s) do the molecules take the shape of the container?

Summarize possible ways in which phases of matter could combine to form a solution.