Which is the correct net ionic equation for the reaction of AgNO 3 and CaCl 2 ?

Ag + (aq) + Cl - (aq) → AgCl(s)

Ca 2+ (aq) + 2Cl - (aq) → CaCl(s)

Which of the following does NOT form a precipitate?

Pb(NO 3 ) 2 (aq) + AgNO 3 (aq) →

Sr(NO 3 ) 2 (aq) + K 2 SO 4(aq) →

Which of these results in the formation of a precipitate?

Pb(NO 3 ) 2 + LiC 2 H 3 O 2 →

Which of the following is the balanced net ionic equation for an oxidation-reduction reaction between Ag⁺(aq) and Ni(s) based on the half-reactions represented below?

2 Ag⁺(aq) + Ni(s) → 2 Ag(s) + Ni²⁺ (aq)

Ag⁺(aq) + Ni(s) → Ag(s) + Ni²⁺ (aq)

2Ag⁺(aq) + Ni(s) → Ag(s) + 2 Ni²⁺ (aq)

Ag⁺(aq) + 2 Ni(s) → Ag(s) + 2 Ni²⁺ (aq)

2F₂(g) + 2NaOH(aq) → OF₂(g) + 2NaF(aq) + H₂O(l) A 2 mol sample of F₂(g) reacts with excess NaOH(aq) according to the equation above. If the reaction is repeated with excess NaOH(aq) but with 1 mol of F₂(g) , which of the following is correct?

The amount of OF₂(g) produced is halved.

The amount of OF₂(g) produced is doubled.

The amount of NaF(aq) produced remains the same.

The amount of NaF(aq) produced is doubled.

A student places a sample of a pure metal in a crucible and heats it strongly in air. Data from the experiment are given in the table above. The final mass was determined after the sample was cooled to room temperature. Which of the following statements related to the experiment is correct?

The mass of the sample increased, so a chemical change occurred when bonds formed between the metal and another substance.

The mass of the sample decreased, so physical changes occurred as the metal first melted and then boiled out of the crucible.

There was nothing for the metal to react with, so only a physical change could have occurred.

The sample was only heated, so neither a physical nor a chemical change occurred.

Based on the half-reactions represented above, which of the following is the balanced ionic equation for the oxidation-reduction reaction between Al(s) and Sn²⁺(aq) ?

2 Al(s) + 3 Sn²⁺(aq)→2 Al³⁺(aq) + 3 Sn(s)

Al(s) + Sn²⁺(aq)→Al³⁺(aq) + Sn(s)

3 Al(s) + 2 Sn²⁺(aq)→3 Al³⁺(aq) + 2 Sn(s)

Al(s) + Sn²⁺(aq) + 2e−→Al³⁺(aq) + Sn(s) + 3e−

A student combines a solution of NaCl(aq) with a solution of AgNO₃(aq), and a precipitate forms. Which of the following is the balanced net ionic equation for the formation of the precipitate?

Ag⁺(aq) + Cl⁻(aq)→AgCl(s)

Na⁺(aq) + NO₃⁻(aq)→NaNO₃(s)

NaCl(aq) + AgNO₃(aq)→NaNO₃(s) + AgCl(aq)

NaCl(aq) + AgNO₃(aq)→NaNO₃(aq) + AgCl(s)

A student combines a solution of NaCl(aq) with a solution of AgNO₃(aq), and a precipitate forms. Assume that 50.0 mL of 1.0 M NaCl(aq) and 50.0 mL of 1.0 M AgNO₃(aq) were combined. According to the balanced equation, if 50.0 mL of 2.0 M NaCl(aq) and 50.0 mL of 1.0 M AgNO₃(aq) were combined, the amount of precipitate formed would

not change, because the amount of AgNO₃(aq) did not change

double, because all of the coefficients are 1

double, because the amount of one of the reactants was doubled

not change, because all of the coefficients are 1

Na₂CO₃(aq) + 2 HCl(aq)→2 NaCl(aq) + H₂O(l) + CO₂(g) A student combined two colorless aqueous solutions. One of the solutions contained Na₂CO₃ as the solute and the other contained HCl. The chemical reaction that took place is represented by the equation above. What experimental result would be evidence that a chemical reaction took place when the solutions were combined?

Bubbles formed when the two solutions were combined.

The total volume of the mixture is close to the sum of the initial volumes.

The resulting solution is colorless.

The resulting solution conducts electricity.

Which of the following is the correct net ionic equation of the reaction that occurs when aqueous solutions of ammonia (NH₃) and hydrochloric acid (HCl) are combined?

NH₃(aq) + H⁺(aq)→NH₄⁺(aq)

NH₃(aq) + HCl(aq)→NH₄Cl(aq)

NH₃(aq) + HCl(aq)→NH₄⁺(aq) + Cl⁻(aq)

NH₃(aq) + H⁺(aq) + Cl⁻(aq)→NH₄⁺(aq) + Cl⁻(aq)

Zn(s) + 2 HCl(aq)→ZnCl₂(aq) + H₂(g) When the reaction represented above proceeds, heat is produced. Which of the following best describes the reaction?

It is an oxidation-reduction reaction because zinc is oxidized and hydrogen is reduced.

It is a combustion reaction because heat is produced by the reaction.

It is a double replacement reaction because 2Cl atoms are added to Zn.

It is an acid-base reaction because HCl is an acid that is capable of exchanging H⁺.

Which of the following best describes the process represented above that takes place when NH₃ is added to water?

It is an acid-base reaction in which a proton is exchanged from H₂O to NH₃.

It is a single replacement reaction in which an electron pair on N is replaced with an H atom.

It is a precipitation reaction in which NH₄OH, an insoluble solid, is produced.

It is an oxidation-reduction reaction in which the oxidation number of N changes from −3 to −4.

2 Mg(s) + SiCl₄(l) ⟶ 2 MgCl₂(s) + Si(s) Which of the following statements about the reaction represented above is correct?

It is an oxidation-reduction reaction, and Mg is oxidized.

It is an oxidation-reduction reaction, and electrons are transferred from SiCl₄ to Mg

It is an oxidation-reduction reaction, and the oxidation number of Cl changes from +4 to +2.

It is not an oxidation-reduction reaction because none of the oxidation numbers change.

5 H₂O₂(aq) + 2 MnO₄⁻(aq) + 6 H⁺(aq) → 2 Mn²⁺(aq) + 8 H₂O(l) + 5 O₂(g)In a titration experiment, H₂O₂(aq) reacts with aqueous MnO₄-(aq) as represented by the equation above. The dark purple KMnO₄ solution is added from a buret to a colorless, acidified solution of H₂O₂(aq) in an Erlenmeyer flask. (Note: At the end point of the titration, the solution is a pale pink color.)Which element is being oxidized during the titration, and what is the element’s change in oxidation number?

Oxygen, which changes from -1 to 0

Oxygen, which changes from 0 to -2

Manganese, which changes from -1 to +2

Manganese, which changes from +7 to +2

Identify which of the following reactions is an acid-base reaction.

NH₃(g) + H₂O(l) → NH₄⁺(aq) + OH-(aq)

3Cu(s) + 2Al³⁺(aq) → 2Al(s) + 3Cu²⁺(aq)

2H₂(g) + O₂(g) → 2H₂O(l)

Cu²⁺(aq) + OH-(aq) → Cu(OH)₂(s)

A student weighs a piece of metal and finds that it is 4.4g. The student then holds this piece of metal with tongs and heats it using the flame of a Bunsen burner. After the final product is cooled, it is weighed and found to have a mass of 5.0g. Which of the following statements related to the experiment is correct?

The mass of the metal increased when it went through a chemical change as bonds formed between the metal and another substance.

The mass of the metal decreased due to the physical processes of melting/boiling.

The metal increased in temperature only and neither a physical or a chemical change occurred.

The metal was only heated and was unable to react with any substance so a physical change occurred.

Which of the following is the net ionic equation for the reaction between aqueous sodium fluoride and hydrochloric acid?

NaF(aq) + HCl(aq) → NaCl(aq) + HF(aq)

Na⁺(aq) + F⁻(aq) + H⁺(aq) + Cl⁻(aq) → Na⁺(aq) + Cl⁻(aq) + HF(aq)

Na⁺(aq) + Cl⁻(aq) → NaCl(aq)

The reaction between aqueous strontium chloride (SrCl₂) and aqueous potassium sulfate (K₂SO₄) forms a precipitate of strontium sulfate (SrSO₄) . Which of the following represents the net ionic equation for the reaction?

Sr²⁺(aq)+SO₄²⁻(aq)→SrSO₄(s)

Sr²⁺(aq)+2Cl⁻(aq)+SO₄²⁻(aq)+2K⁺(aq)→SrSO₄(s)+2Cl⁻(aq)+2K⁺(aq)

SrCl₂(aq)+K₂SO₄(aq)→SrSO₄(s)+2KCl(aq)

A 20. mL sample of 0.50 M HC₂H₃O₂(aq) is titrated with 0.50 M NaOH(aq). Which of the following best represents the species that react and the species produced in the reaction?

HC₂H₃O₂(aq) + OH⁻(aq) → C₂H₃O₂⁻(aq) + H₂O(l)

H⁺(aq) + OH⁻(aq) → H₂O(l)

H⁺(aq) + C₂H₃O₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + NaC₂H₃O₂(aq)

HC₂H₃O₂(aq) + NaOH(aq) → H₂O(I) + Na⁺(aq) + C₂H₃O₂⁻(aq)

Which of the following is a precipitation reaction?

Pb²⁺(aq) + CrO₄²⁻(aq) → PbCrO₄(s)

SO₃(g) + 2 H₂O(l) → H₃O⁺(aq) + HSO₄⁻(aq)

2 H₂O(g) → 2 H₂(g) + O₂(g)

Which of the following is an oxidation-reduction reaction that is also a synthesis reaction?

Pb²⁺(aq) + CrO₄²⁻(aq) → PbCrO₄(s)

SO₃(g) + 2 H₂O(l) → H₃O⁺(aq) + HSO₄⁻(aq)

2 H₂O(g) → 2 H₂(g) + O₂(g)

I₂(aq) + C₆H₈O₆(aq) → C₆H₆O₆(aq) + 2I⁻(aq) +2H⁺(aq) The compound C₆H₈O₆ reacts with I₂ according to the reaction represented by the equation above. The reaction is correctly classified as which of the following types?

Oxidation-reduction, because I₂ is reduced.

Acid-base, because H⁺ ions are produced.

Precipitation, because there are only two reactants but there are three products.

Double replacement, because both H and I appear as ions in the products.

AP Chem Unit 4

Authored by Charles Martinez

Chemistry

11th - 12th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Chemical or physical change? 2 H₂O(l) + O₂(g) → 2 H₂O₂(l)

Chemical

Physical

Chemical or physical change? H₂O(l) → H₂O(g)

Chemical

Physical

Which observation suggests a chemical change occurred?

The mass stays constant

The solution stays colorless

A precipitate forms

In order to be considered an oxidation-reduction reaction,

a precipitate must form

the oxidation number of two species must change

the pH must change

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In order to be considered an acid-base reaction,

a precipitate must form

the oxidation number of two species must change

one or more protons must be transfered

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An acid is defined as a...

proton donor

proton acceptor

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An base is defined as a...

proton donor

proton acceptor

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AP Chem Unit 4

Chemical or physical change? 2 H₂O(l) + O₂(g) → 2 H₂O₂(l)

Chemical or physical change? H₂O(l) → H₂O(g)

Which observation suggests a chemical change occurred?

In order to be considered an oxidation-reduction reaction,

In order to be considered an acid-base reaction,

An acid is defined as a...

An base is defined as a...

In this example, H⁺+ H₂O -> H₃O⁺the water acts as a(n)

Given the following: NH₃(aq) + HCl(aq) ⇄ NH₄⁺(aq) + Cl^-(aq)
The Brønsted-Lowry acids in the reaction represented above are

Which is the correct net ionic equation for the reaction of AgNO₃ and CaCl₂?

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AP Chem Unit 4

Chemical or physical change? 2 H2O(l) + O2(g) → 2 H2O2(l)

Chemical or physical change? H2O(l) → H2O(g)

Which observation suggests a chemical change occurred?

In order to be considered an oxidation-reduction reaction,

In order to be considered an acid-base reaction,

An acid is defined as a...

An base is defined as a...

In this example, H+ + H2O -> H3O+ the water acts as a(n)

Given the following: NH3(aq) + HCl(aq) ⇄ NH4+(aq) + Cl-(aq)The Brønsted-Lowry acids in the reaction represented above are

Which is the correct net ionic equation for the reaction of AgNO3 and CaCl2?

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Chemical or physical change? 2 H₂O(l) + O₂(g) → 2 H₂O₂(l)

Chemical or physical change? H₂O(l) → H₂O(g)

In this example, H⁺+ H₂O -> H₃O⁺the water acts as a(n)

Given the following: NH₃(aq) + HCl(aq) ⇄ NH₄⁺(aq) + Cl^-(aq)
The Brønsted-Lowry acids in the reaction represented above are

Which is the correct net ionic equation for the reaction of AgNO₃ and CaCl₂?