What is a substance that contains only a single type of atom

Consider the following reversible reaction l. 2H2Og 2H2g+O2g what is the equilibrium constant expression for the given system?

What is the molarity of 53.0 grams of HCl dissolved in 400.0 mL of water

What is the relationship between the independent variable and the dependent variable? a. the dependent variable affects the independent variable. b. the independent variable affects the dependent variable. c.

Why is the chemical energy in a battery a form of potential energy rather than kinetic energy?

How many skin cells do a hampsters skin gave

Hydrogen sulfide gas and sulfur dioxide gas react to form solid sulfur and water. If 10.0g of gaseous hydrogen sulphide is mixed with 10.0g of gaseous sulfur dioxide, how many grams of solid sulfur can form?

Describe the contributions of the following scientists to our knowledge of atomic structure: J. J. Thomson, R. A. Millikan, Ernest Rutherford, and James Chadwick

If you have 400 grams of a substance that decays with a half-life of 14 days, then how much will you have after 56 days?

As an electron gains energy, it becomes excited and jumps to a lower energy level?

If 3.011 x 1023 molecules have a mass of 20.04 grams, what is the molar mass of this substance?