How many moles of Cr are in 2.16 mol of Cr2O3?

Is zebra mussel affecting the lives of humans? if so how.

Which of the following is an example of a scientific theory? A.) a prediction that a particular substance will float in water B.) experimental results which show that changing the temperature of a chemical will affect its rate of decay C.

2.50 L of a gas at standard temperature and pressure is compressed to 575 mL. What is the new pressure of the gas

The atomic masses of 204Pb (1.4 percent), 206Pb (24.1 percent), 207Pb (22.1 percent), and 208Pb (52.4 percent) are 203.973020, 205.974440, 206.975872, and 207.976627 amu, respectively. Calculate the average atomic mass of lead.

What are three factors that limit a population's ability to adapt and survive?

A pharmacist measures the mass of a powdered drug. The mass is 506 mg. What is the mass in grams? Write your answer as a decimal.

Which of these is a source of sediment? A. Fragments if other rocks B. Chemicals and minerals dissolved in water C. Sea shells D. All of the above

Entropy is greater at higher trophic levels than at lower levels ... True of False

If the caffeine concentration in a particular brand of soda is 2.85 mg/oz, drinking how many cans of soda would be lethal? Assume that 10.0 g of caffeine is a lethal dose, and there are 12 oz in a can.

Suppose that your favorite AM radio station broadcasts at a frequency of 1600 kHz. What is the wavelength in meters of radiation from the station? (Hint: convert kHz to Hz and find frequency first.)