REDOX REACTIONS

If in a reaction, copper is reduced; its number of electrons has:

• Increased
• Decreased
• Remained Constant
• Varies Randomly

If an atom loses electrons during a chemical reaction, the atom was:

• Oxidized
• Reduced
• Neutralized
• Precipitated

Tags

NGSS.HS-PS1-2

What substance is oxidized in the following reaction?
4Fe + 3O₂ --> 2Fe₂O₃

• Iron
• Fluorine
• Oxygen

Tags

NGSS.HS-PS1-2

Cl₂ + 2e- --> 2Cl ^- is an example of:

• a chemical reaction

• redox

• oxidation

• reduction

Tags

NGSS.HS-PS1-7

An increase in oxidation number.

• more acidic

• reduction

• less basic

• oxidation

A decrease in oxidation number.

• redox

• reduction

• oxidation

• dilute

Oxidation-reduction reactions occur because of the competition between particles for...

• protons

• neutrons

• electrons

• positrons

Which statement correctly describes the oxidation and reduction that occur? $Mg\ +\ PbCl_{2_{\ _{ }}}\rightarrow\ MgCl_{2_{ }}+\ Pb$  

• Mg is oxidized and Cl- is reduced

• Mg is oxidized and Pb+2 is reduced

• Mg is reduced and Cl- is oxidized

• Mg is reduced and Pb+2 is oxidized

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

What is the oxidation number of Cr in Cr₂O₇^2- ?

• +14

• +6

• -6

• -14