Is crushing a rock a chemical or physical change?

How many electrons in an atom can have each of the following quantum number or sublevel designations? (a) 4p (b) n = 3, l = 1, m1 = + 1 (c) n = 5, l = 3

What side does heat go on in an endothermic reaction?

If you had 35g of salt at 40 C would the solution be unsaturated or saturated

1-bromodecane (C10H21Br) produces a mass spectrum with a parent molecular ion (M) peak at m/z 220 (100%). A peak at m/z 222 (98%) also appears in the spectrum. What causes this signal in the mass spectrum

Which of the following elements will gain electrons to form an ion? Ne Zn Ca F select all that apply

Scientist call an organism that has two different alleles for a trait

The molar mass of water (H2O) is 18.02 g/mol. Yun needs 0.025 mol H2O for a laboratory experiment. She calculates that she needs 72.0 g H2O for the experiment. Yun's calculation was incorrect because she set up her unit conversion incorrectly.

I'm doing isotope homework and I need the find the number of protons, neutrons, and electrons first one is chromium-58 and chromium-63

Trisha and her lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid.

what mass of magnesium is required to react with excess nitrogen to produce 0.500 mol magnesium nitrade