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

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

a) alpha particle

b) beta particle

c) gamma ray

d) positron

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.

Which type of nuclear reaction is represented by the equation?

a) fission

b) fusion

c) beta decay

d) alpha decay

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 reaction is represented by the equation?

a) addition

b) substitution

c) fermentation

d) polymerization

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 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)

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