Which of the following is a physical change? A. corrosion B. explosion C. evaporation D. food spoilage

K20 ionic or covalent

Which scientist is known for developing the planetary model of the atom? Niels Bohr Albert Einstein Johannes Rydberg Robert Millikan

What is the number of moles of solute in 650ml of a 0.40M solution?

What is the equilibrium vapor pressure of a liquid and how is it measured

If your front lawn is 18.0 feet wide and 20.0 feet long. And each square foot of lawn accumulates 1450 new snow flakes every minute, how much snow (in kilograms) accumulates on your lawn per hour? Assume an avarage snow flake has a mass of 1.90 mg

How many moles of neon (Ne, 20.179 g/mol) are in 68.4 grams of neon

A 50.00 mL sample of groundwater is titrated with 0.0300 M EDTA. Of 12.40 mL of EDTA is required to titrate the 50.00 mL sample, what is the hardness of the groundwater in molarity and in parts per million of CaCO 3 by mass

Why openness is important to the progress of science?

At a certain temperature the rate of this reaction is second order in NH4OH with a rate constant of 34.1 M^-1s^-1: Suppose a vessel contains NH4OH at a concentration of 0.100M.

If you go into the lab and dissolve 2.11 g of magnesium chloride in enough water to make 1500 ml of solution, what is the molarity of the resulting solution?