The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. what is the mass number of sodium?

What is the relationship between temperature and the rate of a chemical reaction?

What forms of energy are involved when snow on a mountain breaks loose, resulting in an avalanche?

Which statement best describes the kinds of questions we can use science to answer? A. No questions about natural phenomena B. Any and all questions C. Only philosophical questions D. No questions about right and wrong

How do you convert moles of a compound to mass?

How is a pure substance different from a mixture? A:a pure substance is heterogeneous B:a mixture is made of one substance C:mixtures cannot be separated by physical means D:pure substances cannot be separted by physical means

What is the mass of 3 L of water vapor at 120◦C and 388 torr?

List three things you would need to consider to determine whether or not a chemical system is at equilibrium?

How many moles of methane gas molecules, CH4, are in 11.2 liters of methane at standard conditions? a. 11.2 moles b. 27.2 moles c. 179.2 moles d. 0.5 moles

The valve between a 2.00-L bulb, in which the gas pressure is 1.80 atm, and a 3.00-L bulb, in which the gas pressure is 3.40 atm, is opened. What is the final pressure in the two bulbs, the temperature remaining constant?

What determines the order of placement of the elements on the modern Periodic Table? 1. atomic number 2. atomic mass 3. the number of neutrons, only 4. the number of neutrons and protons