If the half-time of krypton-81 is 229,00 years, how much krypton-81 was present when the ice first formed

Is dynamite an atom or a molecule?

If there is a loss of 5.63 x 10 - 7 kg of mass in a nuclear reaction, how many joules of energy would be released? Recall that C equals 3 times 108 m / s.

What is the percent yield if the actual yield from this reaction is 343 g?

Chromium is most commonly mined in the form of chromite, which has the chemical formula fecr2o4. calculate the percent by mass of each element in chromite, and give your answers to four significant digits.

If you measured the temperature of the ocean at increasing depths, will the temperature of the water increase or decrease with depth?

Carbonic acid (H2CO3) does not dissortate 100 percent in water. What type of substance is it? weak acid Strong base strong acid weak base

The standard enthapy of combustion of solid urea co (nh2) 2 is - 632kjmol-1 at 298k

What happens to an isotopes during radioactive

Why does the effective nuclear charge increase across a row of the periodic table?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?