January 2023 Chemistry Regents Questions 41-50 Question Preview (ID: 61258)

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What is the vapor pressure of propanone at 45°C?

a) 21 kPa

b) 60. kPa

c) 70. kPa

d) 79 kPa

Based on Table G, what is the mass of KCl that must be dissolved in 200. grams of H2O at 10.°C to make a saturated solution?

a) 15 g

b) 30. g

c) 60. g

d) 120. g

Based on Table I, which chemical equation represents a reaction with a heat of reaction that indicates a net release of energy?

a) N2(g) + O2(g) → 2NO(g)

b) N2(g) + 2O2(g) → 2NO2(g)

c) 2C(s) + 3H2(g) → C2H6(g)

d) 2C(s) + 2H2(g) → C2H4(g)

The greatest increase in entropy occurs when a 1.00-gram sample of water changes from

a) solid to liquid

b) solid to gas

c) gas to liquid

d) liquid to solid

Which particle diagram represents one substance, only?

a) 1

b) 2

c) 3

d) 4

Based on Table J, atoms of which metal will lose electrons to Ca2+ ions?

a) aluminum

b) lead

c) nickel

d) potassium

Which aqueous solution is the best conductor of an electrical current?

a) 0.1 M NaNO3

b) 0.2 M NaNO3

c) 0.01 M NaNO3

d) 0.02 M NaNO3

This equation represents

a) sublimation

b) condensation

c) fission

d) fusion

Which formula represents 2-butene?

a) 1

b) 2

c) 3

d) 4

Which formula represents an isomer of the compound?

a) 1

b) 2

c) 3

d) 4

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