6. suzie hammers on a block of wood when she is 85 meters from a large brick wall. each time she
she hits the block, she hears an echo 0.50 s later. with this information, show that the speed of
sound is 340 m/s.

In a hydrogen molecule there are a total of four charges, 2 protons in the two nuclei, and 2 electrons. how many unique charge-pairs are there (without double counting)?

What word chemical equation describes cavendish’s experiment with zinc?

Aweather balloon has a volume of 52.5 liters at a temperature of 252 k. the balloon is released and rises to an altitude where the temperature is 295 k. how does this temperature change affect the gas particle motion?