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why is radon-222 considered dangerous?

it is the second leading cause of lung cancer in the u. s.

it cannot be seen, smelled, or tasted.

it is a product of the natural decay of uranium and is often found in the soil on which houses are built.

all of these

Why is nh3 classified as a polar molecule

Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. drag the appropriate items to their respective bins.co(g) + h2o(g) < => co2(g) + h2(g) (volume is decreased) pcl3(g) + cl2(g) < => pcl5(g) (volume is increased) caco3(s)< => cao(s) + co2(g) (volume is increased)

Which of the following molecules is polar? c3h7oh c2h5cooh