4. The mass of a single proton is approximately 1.67 x 10-27 kg. The mass of an electron is

approximately 9.11 x 104 kg. How many times bigger is a proton than an electron?

What are some possible sources of the acids in the atmosphere that contribute to acid rain

Why large nuclei tend to be radioactive?

When 0.422g of phosphorus is burned, 0.967g of a white oxide is obtained. a. Determine the empirical formula of the oxide b. write a balanced equation for the reaction of phosphorus and molecular oxygen on the basis of this empirical formula

Which of the following best describes a pair of elements that will form an ionic bond

Identify which best describes the energy used to pluck guitar strings to make sound. A) electrity b) electromagnetic c) heat d) mechanical

When the positive ion of one compound replaces the positive ion of another compound?

A 2.00 L container of gas has a pressure of 1.00 atm at 300 K. The temperature of the gas is halved to 150K, and the measured pressure of the same 2.00 Liter sample is 0.420 atm.

How many moles of ZnCl, will be produced from 23.0 g of Zn, assuming CuCl, is available in excess?

Glaciation in Alaska is a result of interactions between which of the following "spheres"? Check all that apply. A. biosphere B. exosphere C. geosphere D. cryosphere E. atmosphere F. hydrosphere

In the following equation: FeCl3 + O2 = Fe2O3 + Cl2, what is the limiting reactant if 4 moles of FeCl3 react with 4 moles of O2?