A human hair is about 50 um thick. A pet flea is about 1 mm in size. How

many times smaller is the thickness of a human hair than a flea?

On which side of the equation are the recents located?

How is electronegative used in determining the ionic or covalent character of the bonding between two elements

Calculate the mass of urea that should be dissolved in 175 g of water at 35°C to produce a solution with a vapor pressure of 38.1 mmHg. (At 35°C, P o water = 42.2 mmHg.)

Water can be made to boil at 105 degrees Celsius instead of 100 degrees Celsius by a. applying a great deal of heat. b. increasing the air pressure on the water. c. decreasing the air pressure on the water. d. removing a great deal of heat.

Which equation below can be used to describe the overall changes taking place during photosynthesis? A. 6CO2 + 6O2 C6H12O6 + 6H2O B. 6CO2 + 6H2O C6H12O6 + 6O2 C. C6H12O6 + 6H2O6CO2 + 6O2 D. C6H12O6 + 6O2 6CO2 + 6H2O

Which property of gases allows them to be stored at high concentrations in a bottle of air freshener? What changes occur at the molecular level when ice cream melts and forms a liquid?

a gas has a volume of 6 liters and a pressure of 1.5 atm. if the container is compressed to a volume of 2 liters, what will the pressure of the gas be?

When metals react with nonmetals, an ionic compound generally results. what is the predicted general formula?

Why could the Bohr model not predict line spectra for atoms other than hydrogen?

Cryolite, Na3AlF6 (s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation. 1.) Balance the equation - AlO3 (s) + NaOH (l) + HF (g) - ->Na3AlF6+H2O (g) 2.) If 17.5 kilograms of Al2O3 (s), 51.