Which of the following most likely happens during a physical change? a. an irreversible process takes place. b. substance changes its form but not its molecular composition. c. new atoms are introduced in the molecules of the substance. d. a substance reacts differently with a chemical before and after the change.

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

What four properties do all waves have in common

Magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. trial 1: trial 2: data mass of empty crucible with lid trial 1: 26.688 trial 2: 26.681 mass of mg metal, crucible, and lid trial 1: 26.994 trial: 2 26.985 mass of mgo, crucible, and lid trial 1: 27.188 trial 2: 27.180