The mass of an atom is found by adding its protons and (space) the electric charge of an atom is found by adding the charges carried by its protons and (space)

(first space)
1.electrons
2.neutrons
3.nucleus
(second space)
1.electrons
2.neutrons
3.nucleus

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

Summarize possible ways in which phases of matter could combine to form a solution.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)