How much heat is absorbed during production of 127 g of no by the combination of nitrogen and oxygen?
n2(g)+o2(g)→2no(g), δh = + 43 kcal/mol

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

If oil spills continue, all of the following should be expected except (2 points) death of aquatic life. polluted groundwater. decreased soil productivity. increased global temperatures.

Why is retrograde motion an apparent motion