1. a certain atom has 20 electrons, 21 neutrons, and 20 protons. what is
the atomic mass of the atom?

Alice added sodium chloride to water and stirred the water for several minutes. alice is most likely trying to demonstrate that ionic compounds a. are hard. b. can dissolve. c. are clear. d. can melt.

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

In a set amount of time, a battery supplies 25j of energy to an electric circuit that includes two different loads. one of the loads produces 10 j of heat energy during this time interval. how much heat energy is produced by the second load in this time? explain your answer