January 2018 Chemistry Regents Questions 41-50 Question Preview (ID: 59759)

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

a) decreasing the pressure of the reactants

b) decreasing the temperature of the reactants

c) increasing the concentration of the reactants

d) increasing the volume of the reactants

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

a) min 2 to min 4

b) min 4 to min 5

c) min 5 to min 7

d) min 7 to min 9

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

a) increases by 1

b) increases by 10

c) decreases by 1

d) decreases by 10

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

a) esterification

b) fermentation

c) saponification

d) substitution

Why is potassium nitrate classified as an electrolyte?

a) It is a molecular compound.

b) It contains a metal.

c) It can conduct electricity as a solid.

d) It releases ions in an aqueous solution.

What is the net amount of heat released when two moles of C2H6(g) are formed from its elements at 101.3 kPa and 298 K?

a) 42.0 kJ

b) 84.0 kJ

c) 126.0 kJ

d) 168.0 kJ

Which compounds are isomers of each other?

a) methanol and methanal

b) propanoic acid and pentanoic acid

c) 1 propanol and 2 propanol

d) ethanol and ethanal

The arrangement of particles is most ordered in a sample of

a) NaCl(aq)

b) NaCl(l)

c) NaCl(g)

d) NaCl(s)

Which particle model diagram represents a chemical change?

a) 1

b) 2

c) 3

d) 4

Based on Table H, what is the vapor pressure of CH3COOH at 90°C?

a) 40 kPa

b) 48 kPa

c) 114 kPa

d) 150 kPa

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