Which of the following processes are physical changes?
a) drying wet clothes
b) lighting a match from a matchbook
c) cutting snowflakes out of paper
d) melting butter for popcorn

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.