August 2023 Chemistry Regents 21-30 Question Preview (ID: 62040)

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Which mathematical expression represents the heat of reaction for a chemical change?

a) (PE of the products) - (PE of the reactants)

b) (PE of the products) + (PE of the reactants)

c) (PE of the products) / (PE of the reactants)

d) (PE of the products) x (PE of the reactants)

Catalysts can increase the rate of a chemical reaction by providing

a) an alternate reaction pathway with a higher activation energy

b) the same reaction pathway with a higher activation energy

c) an alternate reaction pathway with a lower activation energy

d) the same reaction pathway with a lower activation energy

Which term represents the disorder of a system?

a) entropy

b) mole

c) quanta

d) pressure

Which element must be present in all organic compounds?

a) nitrogen

b) hydrogen

c) carbon

d) sulfur

Which functional group allows a compound to be classified as an organic acid?

a) 1

b) 2

c) 3

d) 4

In a voltaic cell, oxidation occurs

a) at the cathode

b) at the anode

c) in the salt bridge

d) in the external circuit

Which positive ion must be present in an aqueous solution of an Arrhenius acid?

a) H3O+

b) Na+

c) NH4+

d) Rb+

A change that converts an atom of one element to another element is called

a) neutralization

b) oxidation

c) sublimation

d) transmutation

Which radiation has the least ionizing power and greatest penetrating power?

a) alpha particles

b) beta particles

c) gamma emissions

d) positron emissions

Which nuclear emission is listed with its notation?

a) 1

b) 2

c) 3

d) 4

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