Which are chemical? (Select all that apply.)
blue-black
crystalline
solid
sublimes to a violet-colored gas
reacts with aluminum and many other metals

Which of the following statements are true of solids? a. the particles do not vibrate. b. the particles are in a fixed location. c. they have strong intermolecular forces between the atoms or molecules. d. the particles have less kinetic energy than those of liquids or gases.

What is the length x of the side of the triangle below? (hint: use the cosine function)

The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubble’s law d.) solar nebular theory e.) the seyfert theory