Chapter 20

Oxidation #'s

100

H_{2 (g)}

0

200

Oxygen in H₂O

-2

300

Chlorine in ClO-

+1

400

Chlorine in HCl

-1

500

Lead in Pb(NO₃)₂

2+

Redox Reactions

100

The species that loses electrons in a redox reaction is called the ____________ agent.

reducing

200

Mg²⁺ (aq) + Cu (s) --> Mg (s) + Cu²⁺ (aq)

Which substance got reduced, and what is it called (____ agent)?

Mg got reduced. It is the oxidizing agent.

300

2Mg (s)  + O₂ (g)  --> 2MgO (aq)

What gets oxidized, and what gets reduced?

Mg gets oxidized (0 to +2), O gets reduced (0 to -2)

400

Fe³⁺ _(aq) + 3e– → Fe (s)   E^o_red = +0.771 V

Based on its reduction potential, will aqueous iron (III) get oxidized or reduced? Why?

Reduced

Positive reduction potential

500

What process can be used to force a non-spontaneous redox reaction to occur?

electrolysis

Voltaic Cells

100

The _______ is the part of a voltaic cell where oxidation occurs.

anode

200

A ____________ is used to keep half cells electrically neutral in a voltaic cell. (i.e. balance out excess cations or anions in solution)

salt bridge

300

In a voltaic cell, electrons travel from the _____ to the _________ via a wire.

anode, cathode

400

A voltaic cell is created based on the reaction:

Mg⁺²_(aq) + Cu (s) --> Mg (s) + Cu²⁺ _(aq) 

The E^ocell = -3.14 V

Will this cell work? Why or why not?

The cell does not work. The standard cell potential is negative.  

If you applied a voltage greater than 3.14 V using a battery you could force the reaction to work (via electrolysis).

500

If E^o_cell is a positive voltage, what does that tell you about a reaction?

It is spontaneous and will run on its own.

Grab Bag

100

In ΔG^o = -nFE^ocell, what does n represent?

# moles of electrons

200

The more ________ a standard reduction potential (E^o_red), the more likely a substance will be reduced.

positive

300

Pop up Trivia: Name one element named after a place.

Californium

Americium

Gallium (latin name for France)

Pollonium (Poland)

Scandium

Berkelium

400

Determine the oxidation number for Cu²⁺  

2+ (ions- oxidation numbers equal charges)

500

Chemistry Trivia: What is the only metal that is liquid at room temperature?

Mercury

Trivia

100

Name one current judge on the current season of American Idol.

Lionel Richie

Katy Perry

Luke Bryan

200

This card game is native to the Merrimack Valley. People from other parts of the US likely haven't played this game.

45's

300

This 90's family series (with a current Netflix revival) featured actors including John Stamos and Jodi Sweetin.

Full House

400

What event will take place next Monday, 4/16. This event begins in Hopkinton, MA.

The Boston Marathon

500

Name the film:

"Life's like a box of chocolates. You never know what you're gonna get."

Forrest Gump