Which type of reaction occurs in the following? 2HgO( s ) ---> 2Hg( l ) + O 2 ( g )

a decomposition reaction in which a metal is reduced

an acid-base neutralization reaction to produce oxygen gas

a displacement reaction involving two metals

a combustion reaction involving burning a metal in oxygen

Which answer best describes what is happening in the following reaction? 2C 8 H 18 + 25O 2 ---> 16CO 2 + 18H 2 O

This is a redox reaction in which octane (C8H18) is the reducing agent.

This is not a redox reaction. It is an example of combustion.

This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.

This is not a redox reaction, because a solution of carbon dioxide and water results.

Which describes the oxidizing agent in a chemical reaction?

the substance that is reduced because it gains electrons

the substance that is oxidized because it loses electrons

the substance that is reduced because it loses electrons

the substance that is oxidized because it gains electrons

Which best identifies why the rusting of an iron nail in the presence of water and oxygen is an oxidation-reduction reaction?

Nonmetals and a metal are involved.

Which is a characteristic of a decomposition reaction?

Substance XYZ breaks down into X, Y, and Z.

Substance P replaces X in the compound XY.

Substance Z burns in the presence of oxygen to form ZO.

Substance X combines with Y to form compound XY.

A double replacement reaction can be best described as a reaction in which

ions are exchanged between two compounds.

two atoms of a compound are lost.

electrons are exchanged between two atoms.

Considering the activity series given below for metals and nonmetals, which reaction will occur? Al > Mn > Zn > Cr > Fe > Cd > Co > Ni > Sn > Pb > H > Sb > Bi > Cu > Ag > Pd >Hg > Pt F > Cl > Br > I

2AgNO 3 + Ni ---> Ni(NO 3 ) 2 + 2Ag

2Fe + Al 2 O 3 ---> 2Al + Fe 2 O 3

Pb + Zn(C 2 H 3 O 2 ) 2 ---> Zn + Pb(C 2 H 3 O 2 ) 2

Which word equation shows hydrogen reacting with oxygen to form water?

oxygen + water ---> hydrogen + water

Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. Which word equation best represents this chemical reaction?

isopropanol + oxygen ---> carbon dioxide + water + heat

isopropanol ---> carbon dioxide + water + heat

isopropanol ---> carbon dioxide + water + oxygen

isopropanol + oxygen + heat ---> carbon dioxide + water

The compound FeCl 3 is made of

one atom of iron and three atoms of chlorine.

three molecules of iron chloride.

one atom of iron and three atoms of carbon.

two atoms of iodine, one atom of iron, and one atom of carbon.

Which statement best describes the formula equation Cl 2 (g) + 2KBr(aq) ---> 2KCl(aq)+ Br 2 (l)?

Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.

Carbon iodide reacts with potassium bromide to form potassium carbon iodide and bromine.

Bromine gas reacts with a solution of potassium chloride to form potassium bromide and chlorine gas.

Potassium bromine gas reacts with liquid chlorine to form potassium chloride in solution and bromine gas.

Consider the unbalanced equation for the oxidation of butene. C 4 H 8 + 6O 2 ---> CO 2 + H 2 O For each molecule of C 4 H 8 that reacts, how many molecules of carbon dioxide and water are produced?

four carbon dioxide molecules and four water molecules

two carbon dioxide molecules and two water molecules

two carbon dioxide molecules and four water molecules

four carbon dioxide molecules and two water molecules

Which chemical equation is unbalanced?

H 2 + H 2 + O 2 ---> H 2 O + H 2 O

The compound CO 2 is made of

one atom of carbon and two atoms of oxygen.

one atom of cobalt and two atoms of oxygen.

two atoms of carbon and one atom of oxygen.

Which statement about a chemical reaction is true?

It occurs whenever a chemical change takes place.

It occurs only at low temperatures.

It occurs only at high temperatures.

It occurs whenever a physical change takes place.

Burning a piece of wood in fire can be best described as a

chemical change because the atoms in wood and oxygen are rearranged.

chemical change because the atoms in wood change their state.

physical change because the atoms in wood are turned into a gaseous product.

physical change because the atoms in wood are turned into black ash.

A solid is placed in a solution. Which observation most likely indicates that a chemical reaction has occurred?

The solid has bubbles forming on its surface.

The size of the solid has rapidly decreased.

The color of the solution has not changed.

The temperature of the solution stays the same.

When sodium metal is added to water, an orange flame is observed on the metal surface. Based on this observation, what can best be concluded?

A chemical reaction occurs because heat and light are given off.

A physical change occurs because the metal gets smaller.

A chemical reaction occurs because the liquid becomes cloudy.

A physical change occurs because vapor is released into the air.

Reaction Review

Authored by Charles Martinez

Science

11th Grade

NGSS covered

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63 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a simple definition of oxidation?

the loss of electrons

the gain of electrons

an agent that oxidizes something

an agent that reduces something

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which best describes the oxidizing agent in this reaction?
Cl_2(aq) + 2Br^–_(aq) ---> 2Cl^–_(aq) + Br_2(aq)

Bromine (Br) is the oxidizing agent because it gains an electron.

Bromine (Br) is the oxidizing agent because it loses an electron.

Chlorine (Cl) is the oxidizing agent because it gains an electron.

Chlorine (Cl) is the oxidizing agent because it loses an electron.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Given the reaction below, which is the substance being oxidized?
Mg + Cl₂ ---> Mg²⁺ + 2Cl^–

2CI^–

CI₂

Mg²⁺

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Given the reaction below, which is the substance being reduced?
Mg + Cl₂ ---> Mg²⁺ + 2Cl^–

2CI^–

CI₂

Mg²⁺

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

In the redox reaction below, which is the reducing agent?
MnO_2(s) + 4H⁺_(aq) + 2Cl^–_(aq) ---> Mn²⁺_(aq) + 2H₂O_(l) + Cl_2(g)

CI^–

CI₂

Mn²⁺

MnO₂

Tags

NGSS.HS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which identifies an oxidation-reduction reaction?

a double replacement reaction

a neutralization reaction

a reaction in which oxidation numbers change

a reaction in which no electrons are transferred

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which of the following is an oxidation-reduction reaction?

Fe₂O₃ + 3CO ---> 2Fe + 3CO₂

CuSO₄ + 2NaOH ---> Cu(OH)₂ + Na₂SO₄

2NaOH + H₂CO₃ ---> Na₂CO₃+ 2NaOH

Pb(NO₃)₂ + Na₂SO₄ ---> 2NaNO₃ + PbSO₄

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

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Reaction Review

Which of the following is a simple definition of oxidation?

Which best describes the oxidizing agent in this reaction?
Cl_2(aq) + 2Br^–_(aq) ---> 2Cl^–_(aq) + Br_2(aq)

Given the reaction below, which is the substance being oxidized?
Mg + Cl₂ ---> Mg²⁺ + 2Cl^–

Given the reaction below, which is the substance being reduced?
Mg + Cl₂ ---> Mg²⁺ + 2Cl^–

In the redox reaction below, which is the reducing agent?
MnO_2(s) + 4H⁺_(aq) + 2Cl^–_(aq) ---> Mn²⁺_(aq) + 2H₂O_(l) + Cl_2(g)

Which identifies an oxidation-reduction reaction?

Which of the following is an oxidation-reduction reaction?

Which of the following is an oxidation-reduction reaction?

Which type of reaction occurs in the following?
2HgO(s) ---> 2Hg(l) + O₂(g)

What is the oxidation number for S in the compound SO₃? (Recall that O has an oxidation number of –2.)

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Reaction Review

Which of the following is a simple definition of oxidation?

Which best describes the oxidizing agent in this reaction?Cl2(aq) + 2Br–(aq) ---> 2Cl–(aq) + Br2(aq)

Given the reaction below, which is the substance being oxidized?Mg + Cl2 ---> Mg2+ + 2Cl–

Given the reaction below, which is the substance being reduced?Mg + Cl2 ---> Mg2+ + 2Cl–

In the redox reaction below, which is the reducing agent?MnO2(s) + 4H+(aq) + 2Cl–(aq) ---> Mn2+(aq) + 2H2O(l) + Cl2(g)

Which identifies an oxidation-reduction reaction?

Which of the following is an oxidation-reduction reaction?

Which of the following is an oxidation-reduction reaction?

Which type of reaction occurs in the following?2HgO(s) ---> 2Hg(l) + O2(g)

What is the oxidation number for S in the compound SO3? (Recall that O has an oxidation number of –2.)

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Which best describes the oxidizing agent in this reaction?
Cl_2(aq) + 2Br^–_(aq) ---> 2Cl^–_(aq) + Br_2(aq)

Given the reaction below, which is the substance being oxidized?
Mg + Cl₂ ---> Mg²⁺ + 2Cl^–

Given the reaction below, which is the substance being reduced?
Mg + Cl₂ ---> Mg²⁺ + 2Cl^–

In the redox reaction below, which is the reducing agent?
MnO_2(s) + 4H⁺_(aq) + 2Cl^–_(aq) ---> Mn²⁺_(aq) + 2H₂O_(l) + Cl_2(g)

Which type of reaction occurs in the following?
2HgO(s) ---> 2Hg(l) + O₂(g)

What is the oxidation number for S in the compound SO₃? (Recall that O has an oxidation number of –2.)