- Explain how changes in temperature, the concentration of reactants, the surface area of reactants, and the addition of catalysts affect the rate of a reaction according to
Collision Theory.

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

The number at the end of an isotope’s name is the number.