2. a plastic ball with a volume of 19.7 cm has a mass of 15.8 g. would this ball
sink or float in a container of gasoline? (the density of gasoline is 0.77 g/cm)
3. would the density of a person be the same on the surface of the earth and on the
surface of the moon? explain.
4. what is the symbol and meaning of these common metric prefixes: (see geology
locker for )
(a) milli
(b) nano

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.