Why do some chemical reactions occur? Select all that apply.

so the particles can turn into gas

so the particles can have less energy

so the particles can have less volume

so the particles can be more spread out

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.

Question 2 (5 points) which of the following materials is useful for making molds because it has a low melting point? question 2 options: wood metal wax sand