What characteristics do atoms of argon-40, potassium-40, and calcium-40 have in common?

Which part of a feedback mechanism is able to monitor the conditions outside of cells and usually uses nerve cells to relay this information to an intergrating center

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0