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CHM101 CHAPTERS 4-6 EXAM Practice Questions (definitions/equations)
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CHM101 CHAPTERS 4-6 EXAM Practice Questions (definitions/equations)
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CHM101 CHAPTERS 4-6 EXAM Practice Questions(definitions/equations)
Balanced equation - ANSWER This means that there must be the same amount and type of
atoms on the left or reactant side of the equation as there would be on the right of (product) side
of the equation.
See the steps below for balancing reactions: - ANSWER 1- Write a skeletal equation by
writing the formula of each reactant and product
Count the number of atoms of each element on each side of the equation
polyatomic ions may often be counted as if they are one "element"
2- Pick an element to balance
if an element is found in only one compound on both sides, balance it first
leave elements that are free elements somewhere in the equation until last
3- Find the Least Common Multiple of the number of atoms on each side
the LCM of 3 and 2 is 6
4- Multiply each count by a factor to make it equal to the LCM
Use this factor as a coefficient in the equation
if there is already a coefficient there, multiply it by the factor
it must go in front of entire molecules, not between atoms within a molecule
, 5- Recount and Repeat until Balanced
Aqueous solutions mixtures - ANSWER of a chemical dissolved in water are called aqueous
solutions. Dissolving the chemicals in water helps them to react together faster. The water separates
the chemicals into individual molecules or ions.
dissociation - ANSWER he separate, free floating particles come in contact more frequently
so the reaction speeds up. When ionic compounds dissolve in water, the anions and cations are
separated
Electrolytes - ANSWER usbstances whose solution conducts electricity. All electrolytes
have ions dissolved in water. In strong electrolytes, all the electrolyte molecules or formula units
are separated into ions.
In non-electrolytes, none of the molecules are separated into ions. In weak electrolytes, a small
percentage of the molecules are separated into ions.
soluble v. insolable - ANSWER A compound is soluble in a liquid if it dissolves in that
liquid.
NaCl is soluble in water, but AgCl is not.
A compound is insoluble if a significant amount does not dissolve in that liquid.
Using the Solubility Rules to Predict an Ionic Compound's Solubility in Water - ANSWER
first check the cation, if it is Li+, Na+, K+, or NH4+ then the compound will be soluble in
if the cation is not Li+, Na+, K+, or NH4+ then follow the rule for the anion
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