When wood is burned, energy is released in the forms of heat and light. describe the reaction, and explain why this change does not violate the law of conservation of energy. use the terms combustion, exothermic, and chemical energy.

Burning wood is a form of spontaneous combustion, a type of chemical reaction occurring with chemical energy. It is exothermic, meaning it releases heat when it occurs.When wood is burned, carbon breaks down (which creates the crackling sound you hear) and creates a new material. Since the carbons are not being created and only rearranged, this does not violate the law of conservation of energy.

The net force is 100

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.