{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Handouts_C11

# Handouts_C11 - Electrochemistry Redox Reaction Review...

This preview shows pages 1–2. Sign up to view the full content.

1 Chapter 11 Electrochemistry Big Idea: Electron transfer in a chemical reaction is both material 1 Redox Reaction Review Galvanic Cells Thermo of Electrochemistry and concentration specific. If the process is spontaneous the transfer of electrons can be used to produce a current and drive electrical devices. Nernst Equation Batteries / Fuel Cells Electrolytic Cells Electrochemistry Redox Reaction Review 1. The oxidation number (ON) of an element uncombined with another element is zero: Na(s) ON = 0, and H 2 (g) ON = 0. 2. For monatomic ions, the charge is the ON: Na + ON = +1. 3. The ONs of elements in group 1 equal 1 (ex. Lithium ON = +1) ONs of elements in group 2 equal 2 (ex. Magnesium ON = +2), when the atoms are Assigning Oxidation Numbers 2 in a compound. 4. The ON of fluorine is always -1 in compounds. 5. The ON of the other elements in group 7 usually equal -1 when the atoms are in a compound. 6. The ON of oxygen is usually -2 in compounds. Exceptions are fluorine compounds and peroxide (a compound that contains an O-O single bond). 7. Hydrogen's ON is +1 when combine with non metals and -1 when combined with metals. 8. The sum of the ONs of all the atoms in a species is equal to its total charge. Determining Which Element is Oxidized/Reduced Step 1: Assign oxidation numbers. Redox Reaction Review Electrochemistry 3 Step 2: Use oxidation numbers and OIL RIG to identify which element is oxidized and which is reduced. Note: If the question asks which substance is oxidized, instead of giving the element that is oxidized give the compound containing the element. Oxidizing Agent: A species that removes electrons from a species being oxidized in a redox reaction. Note: Oxidizing agent is the species being reduced Redox Reaction Review Electrochemistry 4 Reducing Agent: The species that supplies electrons to a substance being reduced in a redox reaction. Note: Reducing agent is the species being oxidized. Balancing Redox Reactions in Basic Conditions Step 1: Write unbalanced half reactions. Step 2: Balance half reactions except for O and H. Step 3 : Redox Reaction Review Electrochemistry 5 : Balance O by using H 2 O. Step 4: Balance H by using H 2 O and OH - (H 2 O OH - ). Step 5: Balance electrons in each half reaction. Step 6: Multiply half reactions by an integer so that number of electron match then add reactions together.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

Handouts_C11 - Electrochemistry Redox Reaction Review...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online