What is the concentration in parts per million in a solution containing 100 g of Naf in
3 kilogram of solution?

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

An experimental procedure requires a 10 ml of acid to be dissolved