Answers EDG CHEM ES WLABS2P – Q2_9Oxidation-Reduction

Oxidation-Reduction — Unit test Answers

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Which of the following could form an ionic bond with an anion?

Hg22+

NO2–

SO32–

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Consider the reaction that occurs when copper is added to nitric acid.Cu(s) + 4HNO3(aq) Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l)What is the reducing agent in this reaction?

NO3–

Cu(NO3)2

NO2

Which best describes why NH4+ can form an ionic bond with Cl–?

Its outermost shell gains one or more electrons from Cl–.

Its positive charge is attracted to the negative charge of Cl–.

It has a negative charge that is spread over the entire ion.

It has a nitrogen atom that is strongly attracted to Cl–.

Which describes a step in the process of forming an ionic bond?

A metal atom loses electrons and becomes a positive ion.

A metal atom gains electrons and becomes a negative ion.

A nonmetal atom loses electrons and becomes a negative ion.

A nonmetal atom gains electrons and becomes a positive ion.

What is a three-dimensional structure that represents the alternating pattern of particles in a crystal?

a polyatomic ion

a crystal lattice

a covalent bond

a formula unit

Consider the half reaction below.Which statement best describes what is taking place in this half reaction?

Iron is being reduced.

Iron is being oxidized.

Iron is gaining electrons.

Iron is an oxidizing agent.

What is produced during the replacement reaction of Cu(NO3)2 and Zn?

ZnNO3 + Cu

Zn + Cu(NO3)2

ZnCu + 2NO3

Zn(NO3)2 + Cu

Which type of reaction is Mg + S → MgS?

polymerization

synthesis

replacement

decomposition

Which compound most likely contains polar covalent bonds?

NaCl

AlF3

Br2

NF3

During an experiment, Jon exhales through a straw and blows bubbles into a solution. Which observation would most likely indicate that a chemical reaction is occurring?

The bubbles disappear into the solution before reaching the surface.

The gas forms a layer above the surface of the solution.

The solution becomes very stirred up by the bubbles.

The solution becomes cloudy with a white solid.

Which best describes the reducing agent in the reaction below? Cl2(aq) + 2Br–(aq) 2Cl–(aq) + Br2(aq)

Bromine (Br) loses an electron, so it is the reducing agent.

Bromine (Br) gains an electron, so it is the reducing agent.

Chlorine (Cl) loses an electron, so it is the reducing agent.

Chlorine (Cl) gains an electron, so it is the reducing agent.

An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below.BF3 + Li2SO3 B2(SO3)3 + LiFWhat is the coefficient of lithium fluoride in the balanced chemical reaction?

This formula equation is unbalanced.BaCl2(aq) + Na2CO3(aq) BaCO3(s) + NaCl(aq) Which coefficient should be placed in front of NaCl to balance this equation?