January 2019 Chemistry Regents Questions 41-50 Question Preview (ID: 59749)

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Which numerical setup can be used to calculate the heat energy required to completely melt 100. grams of H2O(s) at 0°C?

a) (100. g)(334 J/g)

b) (100. g)(2260 J/g)

c) (100. g)(4.18 J/gK)(0°C)

d) (100. g)(4.18 J/gK)(273 K)

During which phase change does the entropy of a sample of H2O increase?

a) H2O(g) → H2O(l)

b) H2O(g) → H2O(l)

c) H2O(l) → H2O(g)

d) H2O(l) → H2O(s)

What is a chemical name for this compound?

a) 1-butanamide

b) 2-butanamide

c) 1-butanamine

d) 2-butanamine

Which type of reaction is represented by the equation?

a) addition

b) substitution

c) fermentation

d) polymerization

Which half-reaction equation represents reduction?

a) Cu → Cu^2+ + 2e-

b) Cu^2+ + 2e- → Cu

c) Ag + e- → Ag+

d) Ag+ → Ag + e-

Which statement describes the electrons involved in this reaction?

a) Each Zn atom loses 2 electrons, and each Co^2+ ion gains 2 electrons.

b) Each Zn atom loses 2 electrons, and each Co^2+ ion loses 2 electrons.

c) Each Zn atom grains 2 electrons, and each Co^2+ ion loses 2 electrons.

d) Each Zn atom grains 2 electrons, and each Co^2+ ion gains 2 electrons.

n

a) n

b) m

c) n

d) n

Which solution has the highest pH?

a) A

b) B

c) C

d) D

Which type of nuclear reaction is represented by the equation?

a) fission

b) fusion

c) beta decay

d) alpha decay

Which nuclear emission has the least penetrating power and the greatest ionizing ability?

a) alpha particle

b) beta particle

c) gamma ray

d) positron

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