Radium-226 decays by alpha emission, and the resulting isotope also decays by alpha emission. Write the symbols, including the atomic and mass numbers, for the first and second isotopes produced by these two decays.

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Which bonds are found inside a water molecule

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2