EureekaEureekaEureekaEureeka

What is the normal oxidation number of an uncombined Group 1

metal?

0

In redox reactions what is conserved?

• Mass• Charge• Mass and charge• Neither mass or charge

Mass and charge

During an oxidation what sub-atomic particle is

lost?

electrons

What happens to the protons in the elements

in a redox reaction?

nothing

What are possible oxidation states for H in a

redox reaction?

+10-1

What is the oxidation number of carbon in

NaHCO3?

+4

Chlorine has an oxidation state of +3 in which

compound?• HClO

• HClO2

• HClO3

• HClO4

HClO2

What are the two oxidation states of N in:

•NH4NO3

-3 +5

Which equation is a redox reaction?

• NaCl + AgNO3 AgCl + NaNO3

• HCl + NaOH H2O + KCl

• 2KClO3 2KCl + 3O2

• H2CO3 H2O + CO2

In the reaction Cl2 + H2O HClO +

HCl

• Is the hydrogen reduced/oxidized/both /neither?

__________

Draw a half reaction where Sn0 undergoes

oxidation

Sn0 Sn+2 + 2e-

Write the half reactions for the following reaction?

• Mg + Cl2 MgCl2

Which is more likely to be oxidized Copper or Zinc?

Higher on J will be oxidized

If you put silver in copper nitrate what will happen?

NOTHING

If you put copper in silver nitrate, what will happen?

A REDOX RXN

Given the reaction: 2Al(s) + 6H+ 2Al+3 +

3H2

What is the total number of moles of electrons gained by H+ when 2 moles of Al (s) is completely reacted?

6

Mg + CuSO4 MgSO4 + Cu

Which species acts as the oxidizing agent?

Cu+

2

The following example comes from:

http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/redox/

home.html

In an electrochemical cell what occurs and the

anode?

What occurs at the cathode and what charge is given to it?

Refer to picture A- Is this electrolysis or an

electrochemical cell?- What is the saying that helps you

remember which is positive/negative in electrolytic cells

- Which way do the positive ions migrate when the switch is closed?

A student wishes to set up an electrochemical cell. What other

equipment will she need?

• Two beakers• Wire• Solid Zinc

• 0.1 M Zn(NO3)2

• A voltmeter• Pb metal

• 0.1 M Pb(NO3)2

Refer to picture B• Write the half reaction that represents the

oxidation that is taking place in the electrochemical cell

• Write the half-reaction that occurs at the cathode• Write the balanced, net redox reaction that is

taking place• Draw an arrow showing the direction of the flow

of electrons• What is the purpose of the salt bridge.

Still referring to picture B

• At which electrode would you place something you wanted coated with a metal?