A radioactive material has a count rate of 1600 counts per minute. It has a half life of 20 minutes. How long will it take to decay to a rate of 100 counts per minute?

In just thomsons experiments with electricity he showed that an electrical current can be

At a certain temperature, the equilibrium constant kc is 0.154 for the reaction what concentration of so3 would be in equilibrium with 0.250 moles of so2 and 0.853 moles of o2 in a 1.

Observe the reaction between N2 and H2 to make NH3. N2 (g) + H2 (g) → NH3 (g) If 2 molecules of N2 react with 3 molecules of H2, determine the number of molecules of NH3 that could form from each starting material.

Which of the following elements has two valence electrons? a. Sr b. Na c. Al d. B

Calculate the number of Li atoms in 9.5 moles of Li

For the following SN1 solvolysis reaction, select the correct rate equation and the overall reaction order (note: CH3OH is the solvent for the reaction). (CH3) 3CCl + CH3OH → (CH3) 3OCH3 + HCl

Which of the following is not a possible sublevel? 1s 2p 3f 4d

Fish breathe oxygen, o2, dissolved in the water. since water is a polar substance and oxygen is a nonpolar substance, how can there be any oxygen, o2, in the water?

Barium carbonate, baco3, is stable at ambient temperatures, but decomposes to barium oxide and carbon dioxide at higher temperatures.

How do an isotope and a radioactive isotope differ?