If 100g of Au-198 decays to 6.25g in 10.8 days, what is the Half-Life of Au-198.

Use Ae = Ao (.5) ^ t / t1/2

Which Step In the nitrogen cycle is accelerated at the beginning of the eutrophication process A) Denitrification B) Nitrogen Fixation C) Producer uptake of nitrogen D) Consumer Decomposition

You find a rock that contains equal amounts of potassium-40 and argon-40. how old is it?

Which of the following describes a reaction that reaches equilibrium?

How many atoms are in a sample of 68.7 g of copper

What is 823,549 rounded to three significant figures?

What is the biggest difference between an exothermic and endothermic process? A. The direction of energy flow. B. The amount of energy transferred. C. The type of energy being transferred. D. The speed with which energy is transferred.

The mass of 1 mol of chromium (atomic mass 51.996 amu) is

Which of the following elements will tend to form a cation? A. Oxygen B. Nitrogen C. Sulfur D. Lead E. All of the Above

Is pure orange juice a solution or a suspension

If a catalyst is used in a reaction: a. the energy of activation increases. b. the reaction rate does not change. c. the reaction rate increases. d. the equilibrium shifts.