An 80g sample of 3 1 H decays, leaving 2.5g of 3 1 H. 1. How long would this take?
2. What percentage of this sample would be left?
3. What fraction of this sample would be left?

3 1 H -> 3 2 He + 0 -1 /3 t1/2= 12.3 years

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

What natural processes produce large quantities of co2