Write a balanced chemical equation for each of the following double-replacement reactions. a. A water solution of zinc bromide (ZnBr) and a water solution of potassium hydroxide form a water solution
of potassium bromide and a precipitate of zinc hydroxide.
b. A water solution of copper(II) sulfate and a water solution of barium chloride produce a water solution of
copper(ll) chloride and solid barium sulfate.
C. A precipitate of iron(III) carbonate and a water solution of sodium nitrate are formed when a water solution
of iron(III) nitrate and a water solution of sodium carbonate are mixed.

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.

the ratio of the conjugate base to the acid required to attain the desired ph.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8