August 2022 Chemistry Regents Questions 21-30 Question Preview (ID: 61271)

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Compared to a 1.0-L sample of CO2(g) in a sealed, rigid container at STP, a 1.0-L sample of CH4(g) in a sealed, rigid container at STP has the same

a) density

b) molar mass

c) chemical properties

d) number of molecules

A chemical reaction occurs when

a) H2O(g) forms H2O(l)

b) H2O(l) forms H2O(s)

c) O2(l) forms O2(s)

d) O2(g) forms O3(g)

What is the purpose of adding a catalyst to a chemical reaction?

a) to decrease the potential energy of the products

b) to increase the potential energy of the reactants

c) to convert solid reactants to liquid reactants

d) to provide an alternate reaction pathway

Systems in nature tend to undergo changes toward

a) lower energy and less disorder

b) lower energy and greater disorder

c) higher energy and less disorder

d) higher energy and greater disorder

Which reaction occurs at the anode in an electrochemical cell?

a) neutralization

b) oxidation

c) reduction

d) substitution

As more NaCl(s) is dissolved in a dilute, unsaturated NaCl(aq) solution, the conductivity of the solution

a) decreases as the ion concentration decreases

b) decreases as the ion concentration increases

c) increases as the ion concentration decreases

d) increases as the ion concentration increases

Which substance always forms when an Arrhenius acid reacts with an Arrhenius base?

a) CO2

b) H2

c) CH3OH

d) H2O

Which symbol represents a nuclear emission with the greatest mass and the greatest ionizing power?

a) 1

b) 2

c) 3

d) 4

One potential benefit of nuclear fusion reactions is

a) reactor meltdown

b) uncontrolled chain reaction

c) production of large amounts of energy

d) production of radioactive waste materials

Determining the age of a wooden beam from a sunken ship is an example of a beneficial use of

a) Lewis structures

b) polyatomic ions

c) radioactive nuclides

d) homogeneous mixture

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