Quiestion 5 The actual density of pennies made before 1982 is about 8.8g/mL. The actual density of pennies made after 1982 is about 7.2g/mL. Compare your results with these accepted values what could you have done differently to obtain results closer to the accepted values?

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)