Why is air pressure greatest at the Earth's surface?

because of the pressure of oxygen

because of the weight of ice crystals

because gravity pulls gas molecules toward the surface

because of pollution

Given: Q1 = + 10 µc = 1.0 x 10-5C Q2 = - 15 µc = - 1.5 x 10-5 C K = 9.0 x 109 N·m2/C2 r = 6.0 m

Zinc metal; copper (II) sulfate solution (a) Molecular equation: (b) Total ionic equation: (c) Net ionic equation:

How does William Jennings Bryan respond to the criticism that the free and unlimited coinage of silver will disrupt ""business interests""?

An element has five valence electrons available for bonding. This element is most likely which of the following boron phosphorus tin tellurium

Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don't stick. He guesses that the door of the refrigerator id made of non magnetic substance. What stage of scientific investigation does his guess represent?

How do consumers energy

Given that the molar mass of NaCl is 58.44 g/mol, what is the molarity of a solution that contains 87.75 g of NaCl in 500. mL of solution? moles of solute Use molarity - liters of solution

What are 3 ways to seperate metal particles and salt

Sarah heated some orange coloured crystals in a test tube. The crystals turned green and fizzed. After the fizzing stopped, the test tube was allowed to cool. A green powder was left in the tube.

In which orbital does an electron in a bromine atom experience the greatest effective nuclear charge?