Topic 1

What is a redox reaction?

• A reaction where both reactants get reduced.

• A reaction where both reactants get oxidized.

• A reaction that involves a transfer of electrons between reactants.

• A reaction that involves the combustion of at least one reactant.

Tags

NGSS.HS-PS1-2

What is reduction?

• It is the gain of electrons.

• It is the loss of electrons.

• It is the creation of electrons.

• It is the destruction of electrons.

Tags

NGSS.HS-PS1-2

What is an oxidizing agent?

• It is the species that gets reduced -- gains electrons.

• It is the species that gets oxidized -- loses electrons.

• It is the species that creates electrons.

• It is the species that loses electrons.

Tags

NGSS.HS-PS1-2

What is the oxidation number of Fe in FeO?

• +1
• -1
• +2
• -2

Tags

NGSS.HS-PS1-2

What is oxidation number of O in O₂ ?

• 0

• -2

• +1

• +2

• -1

What is oxidation number of Cr in Cr₂O_7^2-?

• -2
• +2
• +6
• +12

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

• Reduced
• Synthesized
• Oxidized
• None of the above

Tags

NGSS.HS-PS1-2

Which substance is reduced in the following reaction? 
NaOH + Li --> LiOH + Na

• Li
• Na
• O
• H

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Which of the following is the balanced half -reaction for the oxidation of Cu to Cu^+2?

• Cu   --> Cu⁺²
• Cu + 2 e-   --> Cu⁺²
• Cu  --> Cu⁺²  + 2 e-
• Cu - 2e-  --> Cu⁺²

Tags

NGSS.HS-PS1-2

What happens to Cr³⁺ ion when it is converted to CrO₄^2–

• Oxidation number decreases and it undergo reduction
• Oxidation number decreases and it undergo oxidation
• Oxidation number increases and it undergo reduction
• Oxidation number increases and it undergo oxidation

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1