The experimental calculation of aluminum's mass was found to be 25 grams
(experimental value), but the theoretical value is 30 grams. What is the percent
error?

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride

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)