Pure substances contain only one type of a. atoms only. b. molecules only. c. atoms or molecules. d. mixture.

What is a metal replacement reaction

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.

Of the following elements, which is the least reactive? a. c b. h c. li d. he