Which of the following statements is true?
on a level surface, applied force equals weight.
a newton is equal to 9.8 m/s2.
normal forces occur at perpendicular angles to the surface between two objects.
action-at-a-distance forces require physical contact between objects.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

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

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.