The force that is pulling down on a person or object on the surface of the Earth is called (attraction of matter to matter)?
normal force
mass
weight
gravity

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

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.