T-5 Electrochemistry Flashcards Preview

Wenger - AP Chemistry > T-5 Electrochemistry > Flashcards

Flashcards in T-5 Electrochemistry Deck (19):
1

When E > 0 the reaction is ...

spontaneous forward or spontaneous in reverse?

forward

2

When E

spontaneous forward or spontaneous in reverse?

reverse

3

When E > 0 the delta G of the reaction is... 

negative or positive?

negative

4

When E

negative or positive?

positive

5

When E > 0 the reaction is ...

electrolytic or voltaic?

voltaic

6

When E

electrolytic or voltaic?

electrolytic

7

Is the following an oxidation or reduction 1/2 reaction?

Cu2+ + 2e- → Cu

reduction

8

Is the following an oxidation or reduction 1/2 reaction?

Al → Al3+ + 3e-

oxidation

9

How many electrons are transfered in the following redox reaction?

Fe + 3 Ag+ ⇒ Fe3+ + 3 Ag

3 electrons are transfered from the Iron atom to the 3 silver ions

10

How many electrons are transfered in the following redox reaction?

2 H2O2 (aq) ⇒ 2 H2O (g) + O2 (g)

2 electrons are transfered.  One peroxide oxygen transfers an electron to the other so you get 0 and -2 oxidation numbers.  There are two peroxide molecules present so a total of 2 electrons are transfered.  This is a tough one.

11

Which species is most likely to be reduced?

K+ + e- → K      E° = -2.93 V

Na+ + e- → Na      E° = -2.71 V

sodium ion

12

Which species is most likely to be oxidized?

Na+ + e- → Na      E° = -2.71 V

Br2 + e- → 2 Br-      E° = 1.07 V

Na+

13

What are the half reactions for the following reaction?

2 Fe + 3I2 → 2 Fe3+ + 6I-

Fe → Fe3+ + 3e-  

I2 + 2e- → 2I-

14

What are the half reactions for the following reaction?

2Au3+ + 3Pt → 2Au + 3Pt2+

Au3+ + 3e- → Au

Pt → Pt2+ + 2e-

15

How many electrons are transfered in the following redox reaction?

2 Na (s) + 2 H2O (l) ⇒ 2 NaOH (aq) + H2 (g) 

2 electrons are transfered from the sodium atoms to two of the hydrogen atoms in the water molecules.

16

What reaction happens at the anode in a galvanic cell based on the following half cells?

Na+ + e- → Na      E° = -2.71 V

Br2 + e- → 2 Br-      E° = 1.07 V

Na → Na+ + e-      E° = 2.71 V

 

17

What reaction happens at the cathode in a galvanic cell based on the following half cells?

K+ + e- → K      E° = -2.93 V

Na+ + e- → Na      E° = -2.71 V

Na+ + e- → Na      E° = -2.71 V

18

What reaction happens at the cathode in a galvanic cell based on the following half cells?

Au3+ + 3e- → Au

Pt → Pt2+ + 2e-

Au3+ + 3e- → Au

 

19

What reaction happens at the anode in a galvanic cell based on the following half cells?

Fe → Fe3+ + 3e-  

I2 + 2e- → 2I-

Fe → Fe3+ + 3e-