Which statement is not true about oxygen-17 and oxygen-18 (a) they have the same number of protons. (b) their atoms have an identical mass. (c) they are isotopes of oxygen. (d) they do not have the same mass number

Compare and contrast physical changes with chemical changes.

All of the following are part of the biosphere except

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?