Asample of gold has a mass of 38.6 grams and a volume of 2 cm3. what is the density of gold?

What type of reaction is zn + cucl2 → cu + zncl2?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.