Nitrogen is made up of two isotopes N-14 and N15. given nitrogen's atomic weight of 14.007 what is the percent abundance of each isotope

Which of the following is correct? Gas atoms subjected to electricity emit bright lines of light. Gas atoms absorb white light and emit a continuous spectrum of light. Gas atoms under high pressure emit dark lines against a continuous spectrum.

Hypervitaminosis is a serious health threat associated with excessive amounts of ingested fat-soluble vitamins. why do water-soluble vitamins not commonly pose the same threat?

What happens to large molecules such as carbohydrates during digestion? Why does this happen?

A scientit creates a new rock-like substance in a laboratory, why wouldnt this type of material br classified as a true mineral a. its an inorganic substance b. its not a naturally occurring substance c. its too new to be a mineral d.

Which would dissolve faster individual salt crystals a big block of salt

A scientist in London and a scientist in California both conducted independent investigations that produced similar results.

When magnesium combines with oxygen, the reaction involves a. a conversion of protons into electrons. b. sharing of electrons between Mg and O. c. transfer of electrons from Mg to O. d. transfer of electrons from O to Mg.

The activation energy for the reaction no2 (g) + co (g) ⟶no (g) + co2 (g) is ea = 100 kj/mol and the change in enthalpy for the reaction is δh = - 375 kj/mol.

What process transform solar energy into chemical energy?

When the reaction was carried out the calculated theoretical yield for water was 176 grams but the measured yield was 148 grams what is the percent yield