Refer to the example about diatomic gases a and b in the text to do problems 19 - 27.
what is the mass of one mole of product? (remember the law of conservation of mass) g

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

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

An observation that requires measurement is called quantitative observable or qualitative