I need help

in which state of matter are molecules moving the slowest?
solid
liquid
gas
all of the above

The most efficient way to establish the best possible economizer position is to measure

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Based on the equation and the information in the table, what is the enthalpy of the reaction?