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Questions

Explanations

46 A reaction between an alcohol and an organic acid is classified as

(1) esterification               (3) saponification

(2) fermentation              (4) substitution

esterfication

47 Why is potassium nitrate classified as an electrolyte?

(1) It is a molecular compound.

(2) It contains a metal.

(3) It can conduct electricity as a solid.

(4) It releases ions in an aqueous solution.

conducts electricity because of the moving ions

48 When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution

(1) increases by 1             (3) decreases by 1

(2) increases by 10           (4) decreases by 10

pH increases by 1

49 The cooling curve below represents the uniform cooling of a substance, starting at a temperature above its boiling point.

During which time interval does the substance exist as both a liquid and a solid?

(1) min 2 to min 4   (2) min 4 to min 5

(3) min 5 to min 7  (4) min 7 to min 9

50 Given the balanced equation representing a reaction:

CH₄(g) +  2O₂(g) → CO₂(g)  +  2H₂O(g) +  energy

Which change in reaction conditions will increase the frequency of effective collisions between reactant molecules?

(1) decreasing the pressure of the reactants

(2) decreasing the temperature of the reactants

(3) increasing the concentration of the reactants

more collisions

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