1. a piece of metal with a mass of 147 g is placed in a 50-ml graduated
cylinder. the water level rises from 20 ml to 41 ml. what is the density
of the metal?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?