How would you figure the number of protons or electrons in an atom

How many moles of water are represented by 8.33*10^18 molecules of water

Description of the outer core of the earth

A sample of argon gas has a volume of 5.49 L and a temperature of 15.2◦C. Find the new volume, in Liters, of the gas if the temperature increases to 42.1◦C at constant pressure and amount of gas

You have a 20 gram piece of aluminum and a 40 gram piece of aluminum sitting in the sun. Which piece of aluminum will increase by ten degrees first? What is your evidence and reasoning?

What must be true of the liquid in the top layer

The [H3O+] in a solution is increased to twice the original concentration. Which change could occur in the pH? 2.0 to 4.0 1.7 to 1.4 5.0 to 2.5 8.5 to 6.5 6.8 to 9.8

How can I differentiate between Ionic compounds, molecular compounds, and acids given only the formula?

Features of carbon that makes it unique in organic chemistry

What is the difference between hydrostatic pressure and atmospheric pressure?

What is the change in energy? e of the hydrogen atom as the electron makes the transition from the n=3 energy level to the n=1 energy level?