Your answer would be, The gradual fading of the physical memory trace contributed to is STORAGE DECAY.
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1. Ethno-culture in nature( many cultures) 2. Spacial factors such as islands wanting to be separate from their government (separate land) 3. Economic forces (rich parts of the country against poor parts)
A. KBr dissociates (dissolves) when in water. So draw a solution with potassium ions and bromine ions. Since the potassium ion has a positive charge, the oxygen of H2O molecules (negative charge, because water molecules are polar) will be attracted towards the potassium ion with a positive charge. Also draw bromine ions (negative charge), with the hydrogen ends of water molecules attracted to it (because the hydrogen end of water molecules have a positive charge). Make sure the amount of potassium ions and bromine ions are equal because the ratio of potassium to bromine is 1:1
B. According to solubility rules, Br- is soluble with everything else except Ag 2+, Hg2 2+, and Pb 2+.SInce potassium is neither of the three, Br is soluble when with K.