What particle (s) give an atom its mass number?

Which of the following is incorrect? A. Niels Bohr developed a quantum model for the hydrogen atom. B. The lowest possible energy state of a molecule or atom is called its ground state. C.

The particles with a negative charge are 1) protons 2) neutrons 3) electrons

A brick lies perilously close to the edge of the flat roof of a building. The roof edge is 50 ft above street level, and the brick has 370.0 J of potential energy with respect to street level.

Process A: A + B - -> C dG = 101.3 kJ/mol Process B: D - -> C + E dG = - 101.3 kJ/mol If you were tasked with the production of compound C for a pharmaceutical company, which process would you use for it's production based on the data provided and

What impact would a sudden increase in the price of wood have on producers and consumer? How might each group respond to the change in price?

Does a mole of hydrogen have the same mass as a mole of oxygen? explain your answer.

A 0.500-L sample of H₂SO₄ solution was analyzed by taking a 100.0mL aliquot and adding mL of. After the reaction occurred, an excess of ions remained in the solution. The excess base required mL of for neutralization.

Ammonia can be prepared by the reaction of magnesium nitride with water. The products are ammonia and magnesium hydroxide. Write and balance the equation.

Which period is the shortest in the long form of the periodic table? Name all the elements in this period.

A mole of gas at 0.0oC and 760. torr occupies 22.4 L. What is the volume of this gas at 25. oC and 760. torr