CHEM 121 2024 REAL EXAM QUESTIONS WITH VERIFIED CORRECT ANSWERS || GRADED A+ < LATEST VERSION>
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CHEM 121
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CHEM 121
CHEM 121 2024 REAL EXAM QUESTIONS WITH VERIFIED CORRECT ANSWERS || GRADED A+ < LATEST VERSION>
1. molecular equation - ANSWER a chemical equation in which the formula for each substance is written without regard for whether it is an electrolyte or a nonelectrolyte
2. complete ionic...
CHEM 121 2024 REAL EXAM
QUESTIONS WITH VERIFIED
CORRECT ANSWERS || GRADED A+
< LATEST VERSION>
1. molecular equation - ANSWER ✔ a chemical equation in which
the formula for each substance is written without regard for
whether it is an electrolyte or a nonelectrolyte
2. complete ionic equation - ANSWER ✔ a chemical equation in
which dissolved strong electrolytes (such as dissolved ionic
compounds) are written as separate ions
3. spectator ions - ANSWER ✔ ions that go through a reaction
unchanged and that appear on both sides of the complete ionic
equation
4. net ionic equation - ANSWER ✔ a chemical equation for a
solution reaction in which soluble strong electrolytes are written as
ions and spectator ions are omitted
5. acid - ANSWER ✔ a substance that is able to donate a H+ ion (a
proton) and, hence, increases the concentration of H+(aq) when it
dissolves in water: often called proton donors
6. monoprotic acid - ANSWER ✔ yields one H+ molecule per
molecule of acid
, 7. acid - ANSWER ✔ yields two H+ molecules per molecule of acid
8. base - ANSWER ✔ a substance that is an H+ acceptor; a base
produces an excess of OH-(aq) ions when it dissolves in water
9. strong acid - ANSWER ✔ an acid that ionizes completely in water
10. strong base - ANSWER ✔ a base that ionizes completely in
water
11. weak acid - ANSWER ✔ an acid that only partially ionizes in
water
12. weak base - ANSWER ✔ a base that only partly ionizes in water
13. neutralization reaction - ANSWER ✔ a reaction in which an acid
and a base react in stoichiometrically equivalent amounts; the
neutralization reaction between an acid and a metal hydroxide produces
water and a salt
13.salt - ANSWER ✔ an ionic compound formed by replacing one or
more hydrogens of an acid by other cations
14. oxidation-reduction (redox) reactions - ANSWER ✔ a reaction in
which certain atoms undergo changes in oxidation states. The substance
increasing in oxidation state is oxidized; the substance decreasing in
oxidation state is reduced
15. oxidation - ANSWER ✔ a process in which a substance loses one or
more electrons
,16. reduction - ANSWER ✔ a process in which a substance gains one or
more electrons
17. oxidation number (oxidation state) - ANSWER ✔ a positive or
negative whole number assigned to an element in a molecule or ion on
the basis of a set of formal rules; to some degree it reflects the positive
or negative character of that atom
18. displacement reaction - ANSWER ✔ a reaction in which an element
reacts with a compound, displacing an element from it
19. activity series - ANSWER ✔ a list of metals in order of decreasing
oxidation state
20. concentration - ANSWER ✔ the quantity of solute present in a given
quantity of solvent or solution
21. molarity (M) - ANSWER ✔ the concentration of a solution
expressed as mole of solute per liter of solution; abbreviated M
22. dilution - ANSWER ✔ the process of preparing a less concentrated
solution from a more concentrated one by adding solvent
23.titration - ANSWER ✔ the process of reacting a solution of
unknown concentration with one of known concentration (a standard
solution)
24. standard solution - ANSWER ✔ a solution of known concentration
25. equivalence point - ANSWER ✔ the point in a titration at which the
added solute reacts completely with the solute present in the solution
, 26. Methanol - ANSWER ✔ CH3OH - does not disassociate in ions
when it dissolves, non electrolyte
30. Which two anions are soluble ionic compounds no matter what? -
ANSWER ✔ NO3- (Nitrate) and CH3COO- (acetate)
31. Cl- solubility rules and restrictions - ANSWER ✔ soluble unless
with Ag+, Hg2+2, Pb+2
32. Br- solubility rules and restrictions - ANSWER ✔ soluble unless
with Ag+, Hg2+2, Pb+2
33. I- solubility rules and restrictions - ANSWER ✔ soluble unless with
Ag+, Hg2+2, Pb+2
34. SO4 -2 solubility rules and restrictions - ANSWER ✔ soluble unless
with Sr2+ Ba2+ Hg2 2+ and Pb2+
35. CO3-2 - ANSWER ✔ insoluble unless with NH4+ or alkali metals
(1A excluding H+)
36. PO4-3 - ANSWER ✔ insoluble unless with NH4+ or alkali metals
(1A excluding H+)
37. S-2 - ANSWER ✔ insoluble unless with Ca2+ Sr2+ Ba+ NH4+ and
alkali metal cations
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