Which of the following does not accurately describe the forces that exist with an atom? a. electrons in an atom are attracted to the protons within the nucleus due to opposite charges. b. electrons closer to the nucleus and electrons farther from the nucleus repel due to like charges. c. electrons positioned farther away from the nucleus are less attracted to the nucleus than are electrons positioned closer to the nucleus. d. electrons positioned closer to the nucleus have a greater attraction to the protons and are more likely to be discharged from the atom than electrons farther away.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a.a piece of paper b.a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block