Which of these reactions is a combustion reaction?

a. burning wood
b. decomposition of water
c. production of food by plants with the of the sun's energy
d. rotting of fruits and vegetables

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

What is the atomic number of an atom that has 6 protons

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.