Given a 800 mg sample of thorium-231 decomposes via beta emission with a half life of 25.5 hours, how long would it take, in days, for the sample to decay down to 25 mg?

231 0 231

th - > beta pa

90 - 1 91

800 mg / 25 mg

Which part of an atom has most of its mass?

Which of the following elements is a Group 1 metal? A. He B. F C. Ca D. Cs

How to find the atomic mass

Which must be a mixture of substances? 1. solid 2. liquid 3. gas 4. solution

When scientist proclaimed that the Earth is round, not flat

what combination will result in a acidic solution? a reaction of strong acid and strong base b reaction of strong acid and weak base c a reaction of weak acid and strong base d reaction of weak acid and weak base

How many moles of sucrose (C12 H12 O11) would be in 7.1 liters of a 0.93 molarity solution of sucrose?

If the temperature is constant what change in volume would cause the pressure of an enclosed gas to increase by a factor of 4

For the reaction of carbon with carbon dioxide to make carbon monoxide, one set of conditions produced a Kc = 1.2 * 10-1. At equilibrium at a certain temperature, the concentration of product was 0.60 M.

Water is a colorless and odorless liquid. It can exist in solid, liquid, and gas states. It boils at 100 degrees C and melts at 0 degrees C. Which option best describes this information? A. These are the physical properties of water. B.