How many half-lives are required for three-fourths of the nuclei of an isotope in a sample to decay?

Five moles of monatomic ideal gas have initial pressure 2.50 * 103 Pa and initial volume 2.10 m3. While undergoing an adiabatic expansion, the gas does 1480 J of work. What is the final pressure of the gas after the expansion?

What is a solution? Are all mixtures solutions? Are all solutions mixtures?

Is a fireplace poker glowing red when placed into fire a chemical or physical change

Magnesium has three isotopes. Magnesium-24 has a percent abundance of 78.99% Magnesium - 26 has a percent abundance of 11.01% What is the percent abundance of mangesium - 25?

What's the difference between direct and indirect methods of flood control?

Which if the following is an example of a stratovolcano?

There are five elements named for famous scientists on the periodic table

What character acids is that they react with metals to

The energy of a particular color of green light is 3.81*10-22 kJ/photon. The wavelength of this light is nanometers

How many molecules are in. 25 mole of O2