What would the concentration of OH- be if the concentration of H3O+ was 1 × 10-8M? [H3O+] × [OH-] = Kw = 1 × 10-14

A) 1 × 10-14 B) 1 × 10-6 C) 1 × 108 D) 1 × 106 E) 1 × 10-8 A) 1 × 10-14 B) 1 × 10-6 C) 1 × 108 D) 1 × 106 E) 1 × 10-8

In a battery,the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn+2 + 2e- Rxn B: 2 NH4+ + 2e- → 2 NH3 + H2 Which reaction is taking place at the cathode?

A) rxn A B) rxn B C) Both reactions are happening at both the anode and cathode. D) Both reactions are happening are happening at the electrode. E) The reaction takes place at the electrode,not the cathode. A) rxn A B) rxn B C) Both reactions are happening at both the anode and cathode. D) Both reactions are happening are happening at the electrode. E) The reaction takes place at the electrode,not the cathode.

Exam 18: Two Classes of Chemical Reactions

Chemical equations need to be balanced not only in terms of the number of atoms,but also by the charge.In other words,just as there should be the same number of atoms before and after the arrow of an equation,there should be the same charge.What set of coefficients is necessary to balance the following chemical equation? $\mathrm { Sn } ^ { 2 + }$ + Ag ? Sn + Ag?

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Question 1

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Which of the following solutions is the most acidic?

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Question 2

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What is the hydroxide ion concentration in an aqueous solution where the pH = 5?

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Question 3

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What element is oxidized in the following equation and what element is reduced? $\mathrm { Sn } ^ { 2 + }$ + 2 Ag ? Sn + 2 Ag?

(Multiple Choice)

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Question 4

What would the concentration of OH^- be if the concentration of H₃O⁺ was 1 × 10^-8M? [H₃O⁺] × [OH^-] = K_w= 1 × 10^-14

(Multiple Choice)

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Question 5

In one type of fuel cell the following oxidation-reduction reactions are taking place: 2 H₂ + O₂ → 2 H₂O What is the fuel?

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Question 6

According to the following reaction,which molecule is acting as a base? H₂O + H₂SO₄ → H₃O⁺ + HSO₄^-

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Question 7

In a battery,the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn⁺² + 2e^- Rxn B: 2 NH₄⁺ + 2e^- → 2 NH₃ + H₂ Which reaction is taking place at the cathode?

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Question 8

A chemical equation for the combustion of propane,C₃H₈,is shown below.Through this reaction is the carbon oxidized or reduced? $\mathrm { C } _ { 3 }$ $\mathrm { H } _ { 8 }$ + 5 $\mathrm { O } _ { 2 }$ ? 3 $\mathrm { CO } _ { 2 }$ + 4 $\mathrm { H } _ { 2 }$ O

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Question 9

When the hydronium ion concentration equals 10 moles per liter,what is the pH of the solution? Is the solution acidic or basic?

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Question 10

What does the value of $\mathrm { K } _ { \mathrm { W } }$ say about the extent to which water molecule react with themselves?

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Question 11

Along with the pH scale,there is the pOH scale,which indicates the level of "basicity" in a solution.Accordingly,pOH = -log[OH^-].What is the sum of the pH and the pOH of a solution always equal to?

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Question 12

Which of the following statements best describes a cathode?

(Multiple Choice)

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Question 13

Which of the following statements about strong and weak acids is not true?

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Question 14

If you had a 1 M solution of a strong acid what would be its pH?

(Multiple Choice)

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Question 15

For the following reaction,identify whether the compound in bold is behaving as an acid or a base. H₃PO₄ + H₂O ⇌ H₂PO₄^- + H₃O⁺

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Question 16

Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O₂ → 2 Fe₂O₃ _{What is happening at the cathodic region?}

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Question 17

-Which of the above images best depicts a water solution of a weak acid (represented by HA)?

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Question 18

Iron atoms have a greater tendency to oxidize than do copper atoms.Is this good news or bad news for a home in which much of the plumbing consists of iron and copper pipes connected together? Explain.

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Question 19

What is the relationship between the hydroxide ion and a water molecule?

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Question 20

Showing 1 - 20 of 177

Exam 18: Two Classes of Chemical Reactions

Which of the following solutions is the most acidic?

What is the hydroxide ion concentration in an aqueous solution where the pH = 5?

What element is oxidized in the following equation and what element is reduced? Sn2+\mathrm { Sn } ^ { 2 + }Sn2+ + 2 Ag ? Sn + 2 Ag?

What would the concentration of OH- be if the concentration of H3O+ was 1 × 10-8M? [H3O+] × [OH-] = Kw = 1 × 10-14

In one type of fuel cell the following oxidation-reduction reactions are taking place: 2 H2 + O2 → 2 H2O What is the fuel?

According to the following reaction,which molecule is acting as a base? H2O + H2SO4 → H3O+ + HSO4-

In a battery,the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn+2 + 2e- Rxn B: 2 NH4+ + 2e- → 2 NH3 + H2 Which reaction is taking place at the cathode?

A chemical equation for the combustion of propane,C3H8,is shown below.Through this reaction is the carbon oxidized or reduced? C3\mathrm { C } _ { 3 }C3​ H8\mathrm { H } _ { 8 }H8​ + 5 O2\mathrm { O } _ { 2 }O2​ ? 3 CO2\mathrm { CO } _ { 2 }CO2​ + 4 H2\mathrm { H } _ { 2 }H2​ O

When the hydronium ion concentration equals 10 moles per liter,what is the pH of the solution? Is the solution acidic or basic?

What does the value of KW\mathrm { K } _ { \mathrm { W } }KW​ say about the extent to which water molecule react with themselves?

Along with the pH scale,there is the pOH scale,which indicates the level of "basicity" in a solution.Accordingly,pOH = -log[OH-].What is the sum of the pH and the pOH of a solution always equal to?

Which of the following statements best describes a cathode?

Which of the following statements about strong and weak acids is not true?

If you had a 1 M solution of a strong acid what would be its pH?

For the following reaction,identify whether the compound in bold is behaving as an acid or a base. H3PO4 + H2O ⇌ H2PO4- + H3O+

Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O2 → 2 Fe2O3 What is happening at the cathodic region?

-Which of the above images best depicts a water solution of a weak acid (represented by HA)?

Iron atoms have a greater tendency to oxidize than do copper atoms.Is this good news or bad news for a home in which much of the plumbing consists of iron and copper pipes connected together? Explain.

What is the relationship between the hydroxide ion and a water molecule?

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What element is oxidized in the following equation and what element is reduced? $\mathrm { Sn } ^ { 2 + }$ + 2 Ag ? Sn + 2 Ag?

What would the concentration of OH^- be if the concentration of H₃O⁺ was 1 × 10^-8M? [H₃O⁺] × [OH^-] = K_w= 1 × 10^-14

In one type of fuel cell the following oxidation-reduction reactions are taking place: 2 H₂ + O₂ → 2 H₂O What is the fuel?

According to the following reaction,which molecule is acting as a base? H₂O + H₂SO₄ → H₃O⁺ + HSO₄^-

In a battery,the following two oxidation-reduction reactions are taking place: rxn A: Zn → Zn⁺² + 2e^- Rxn B: 2 NH₄⁺ + 2e^- → 2 NH₃ + H₂ Which reaction is taking place at the cathode?

A chemical equation for the combustion of propane,C₃H₈,is shown below.Through this reaction is the carbon oxidized or reduced? $\mathrm { C } _ { 3 }$ $\mathrm { H } _ { 8 }$ + 5 $\mathrm { O } _ { 2 }$ ? 3 $\mathrm { CO } _ { 2 }$ + 4 $\mathrm { H } _ { 2 }$ O

What does the value of $\mathrm { K } _ { \mathrm { W } }$ say about the extent to which water molecule react with themselves?

Along with the pH scale,there is the pOH scale,which indicates the level of "basicity" in a solution.Accordingly,pOH = -log[OH^-].What is the sum of the pH and the pOH of a solution always equal to?

For the following reaction,identify whether the compound in bold is behaving as an acid or a base. H₃PO₄ + H₂O ⇌ H₂PO₄^- + H₃O⁺

Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O₂ → 2 Fe₂O₃ _{What is happening at the cathodic region?}