Use a piece of paper to put a few crystals of KCL03 into the test tube, add about 1ml of concentrated HCL solution to the test tube, and then quickly take a piece of filter paper impregnated with 0.05N KL solution and starch paste and place it on the mouth of the test tube. The result is that in a test tube, there is a yellow-green gas rising and a piece of filter paper from white to black. Explain the phenomena that occur and write the reaction equation to prove it.

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?