Chemistry, 03.07.2019 01:00 babyboo6745

Write the half reactions for the following equation. identify which half reaction is oxidized and which is reduced. ag + no₃- --> ag+ + no write the half reactions for the following equation. identify which half reaction is oxidized and which is reduced. zn + no₃- --> zn²+ + no₂ write the half reactions for the following equation. identify which half reaction is oxidized and which is reduced. cr₂o₇ ²- (aq) + h₂s(g) --> cr³+(aq) + s(s)

Answers: 1

Show answers

Answers

Answer from: lexhoangg

Question 1

We start with the half reaction for silver (Ag) is

$Ag \implies Ag^+$

There is an imbalance of charge with left hand side having a charge of 0 and right hand side having a charge of +1. So we add an electron on the right hand side to balance the charges.

$Ag \implies Ag^+ + e$

This would be the oxidation half reaction since is being oxidized. Oxidation is loss of electrons. loses electrons to form the Ag^+

The next half reaction is NO_3^-

$NO_3^- \implies NO$

There are 3 oxygen atoms on left hand side and 1 on right hand side. So we add 2 water molecules on right hand side to balance oxygen.

$NO_3^- \implies NO + 2H_2O$

Then we add H^+ ions on left hand side to balance hyrdogen.

$NO_3^- + 4H^+ \implies NO + 2H_2O\\$

We have imbalance of charge with left hand side having an overall +3 (-1 + 4) while right hand side has 0. So we add 3 electrons on left hand side to get the charge to equal on each side.

$NO_3^- + 4H^+ + 3e \implies NO + 2H_2O$

The NO_3^- ion is getting reduced because it is gaining electrons. Reduction is gain of electrons.

Question 2

We start with the half reaction of

$Zn \implies Zn^2^+$

There is an imbalance of charge so we add 2 electrons on right hand side to balance the charge.

$Zn \implies Zn^2^+ + 2e$

Zn is being oxidized in the reaction since it is losing electrons to obtain a higher oxidation state.

The half reaction for NO_3^- is similar as the one obtained above

$NO_3^- + 4H^+ + 3e \implies NO + 2H_2O$

is being reduced since it is moving from a +5 oxidation state to a +2 oxidation state by gaining electrons.

Question 3

We start with the dichromate ion Cr_2O_7^2^-

$Cr_2O_7^2^- \implies Cr^3^+$

First we balance the chromium ions by adding a coefficient of 2 on right hand side.

$Cr_2O_7^2^- \implies 2Cr^3^+$

Then we add 7 water molecules on right hand side to balance the oxygen

$Cr_2O_7^2^- \implies 2Cr^3^+ + 7H_2O$

Now we add 14H^+ ions on left hand side to balance hydrogen

$Cr_2O_7^2^- + 14H^+ \implies 2Cr^3^+ + 7H_2O$

The we add 6 electrons on left hand side to give a +6 charge on each side

$Cr_2O_7^2^- + 14H^+ + 6e \implies 2Cr^3^+ + 7H_2O$

The chromium ion is being reduced since it moves from oxidation state of +6 to a +3 oxidation state.

The second half reaction:

$H_2S \implies S$

We balance the hydrogen by adding H^+ ions on right hand side

$H_2S \implies S + 2H^+$

Now we balance the charge by adding 2 electrons on right hand side

$H_2S \implies S + 2H^+ + 2e$

Hydrogen is being oxidized since it moves from oxidation state of 0 to an oxidation state of +2

Answer from: Quest

They did not study the continental drift

Answer from: Quest

Hno3(aq) → h+(aq) + no3−(aq). picture ii best represents the strong acid hno3. strong acids are strong electrolytes

Another question on Chemistry

Chemistry, 22.06.2019 02:00

Will give brainliest it is a lab from k12 here is the linkfor each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. type your answer here. (score for question 3: of 5 points) were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. type your answer here. (score for question 4: of 5 points) make a general statement about the reactivity of the metals in this experiment. type your answer here.

Answers: 2

Answer

Chemistry, 22.06.2019 14:00

What was bohr’s contribution to the planetary model

Answers: 1

Answer

Chemistry, 22.06.2019 18:00

Find the mass, in grams, of 5.00*10^23 molecules of f2

Answers: 1

Answer

Chemistry, 22.06.2019 19:00

How many moles are contained in 5.6 l of h2 at stp