An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these? a. an atom that contains 12 protons and 13 neutrons. b. an atom that contains 13 protons and 12 neutrons. eliminate c. an atom that contains 12 protons and 25 neutrons. d. an atom that contains 25 protons and 12 neutrons.

What’s the scientific notation for the number 6,840,000,000

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?