A student has found that her sample of potassium nitrate is contaminated with small amounts of a green solid. She picks out a small piece of the
green solid and finds that it is insoluble in water.

a) describe now you would make a pure sample of potassium nitrate from the impure mixture.

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.

Which can be observed only in a microscopic view? a) structure of a muscle cell b) shape of a soybean plant c) foam insulation d) x-ray of a knee joint

Why protons do not repal in the nucleus