in a neutralization reaction, sodium carbonate solution was dissolved in water and the solution made to 250cm,25cm of this solution neutralized 20cm of 0.25M nitric acid . calculate the mass of carbonate that was dissolved in water​

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

Chemistry worksheet - i am not sure what they are asking for exactly?

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)