August 2023 Chemistry Regents 41-50 Question Preview (ID: 62042)

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What is the amount of heat energy absorbed when 40.0 grams of water is heated from 10.0°C to 30.0°C?

a) 1.67 × 10^3 J

b) 3.34 × 10^3 J

c) 5.02 × 10^3 J

d) 2.67 × 10^5 J

What is a chemical name of this compound?

a) 2,3,3-trimethylbutane

b) 2-methyl-2-ethylbutane

c) 2,3-dimethylpentane

d) 2,3-ethylpentane

During which intervals is the potential energy decreasing while the average kinetic energy remains constant?

a) BC and AB

b) BC and DE

c) EF and AB

d) EF and DE

Which formula represents a hydrocarbon?

a) CO2

b) C3H8

c) C2H4O2

d) C3H8O

Which type of organic reaction produces carbon dioxide and water?

a) combustion

b) esterification

c) fermentation

d) saponification

Which half-reaction equation represents the oxidation of lithium?

a) 1

b) 2

c) 3

d) 4

Which ionic equation represents a spontaneous reaction that can occur in a voltaic cell?

a) 1

b) 2

c) 3

d) 4

In this system, the H2O(l) acts as

a) 1

b) 2

c) 3

d) 4

Which indicator is blue in a solution that has a pH value of 7.0?

a) bromcresol green

b) methyl orange

c) phenolphthalein

d) thymol blue

Which radioisotope requires long-term storage to prevent the risk of biological exposure?

a) N-16

b) K-42

c) Pu-239

d) Au-198

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