Redox Reactions and Net Ionic Equations

Reduction/Oxidation (Redox) reaction

•  A reaction in which electrons are transferred from one chemical to another, but no chemical bonds have been altered in the process.

• The representation of a chemical reaction using chemical formulas to indicate what substances are being altered or created during chemical reactions.

• The chemicals that are being chemically changed in a chemical reaction. Found on the left side of the arrow in a chemical equation.

• The chemicals resulting from a chemical reaction. Found on the right side of the arrow in a chemical equation.

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NGSS.HS-PS1-7

Net ionic equation

• The ions in a chemical reaction that remain aqueous throughout the entire reaction.

• The chemical equation that represents the ions that are participating in the actual chemistry. The spectator ions are removed from the overall equation to reveal the net ionic equation.

• An insoluble (solid) substance that is formed from two soluble (aqueous) substances.

• 1. Both matter and mass are conserved throughout a chemical reaction.

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NGSS.HS-PS1-7

Given the balanced ionic equation representing a reaction: 2Al(s) + 3Cu²⁺(aq) → 2Al³⁺(aq) + 3Cu(s) Which half-reaction represents the reduction that occurs?

• Al → Al³⁺ + 3e^-

• Al³⁺ + 3e^- → Al

• Cu → Cu²⁺ + 2e^-

• Cu²⁺ + 2e^- → Cu

Another name for a "oxidation-reduction" reaction is

• chemical reaction

• neutralization reaction

• redox reaction

• nuclear reaction

• is reduced

• is oxidized

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NGSS.HS-PS1-2

Lead(II) oxide undergoes a number of different redox reactions. In which of the following reactions is lead(II) oxide,PbO, not reduced?

• A

• B

• C

• D

Three reactions are shown below. NO+O₃ →NO₂ +O₂ 2C +O₂ → 2CO 2MgO+O₂ → 2MgO Which row correctly describes the process each reactant molecule undergoes?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2

Magnesium reacts with iron(III) oxide in the following reaction.

• A

• B

• C

• D

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

As an element is oxidized, its oxidation number

• increases as electrons are gained

• decreases as electrons are gained

• decreases as electrons are lost

• increases as electrons are lost

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2