oxidation and reduction

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

• -2
• +2
• +6
• +12

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following elements does NOT have an oxidation number of +2?

• Ca
• Sr
• K
• Ba

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the oxidation number of Ca in Ca₃N₂?

• +3
• +2
• -3
• -2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

• Reduced
• Synthesized
• Oxidized
• None of the above

Tags

NGSS.HS-PS1-2

the loss of hydrogen or electrons is known as 

• dehydration
• hydrogenation
• reduction
• oxidation

Tags

NGSS.HS-PS1-2

Oxidation involves

• gaining electrons; gaining oxygen
• losing electrons; losing oxygen
• gaining electrons; losing oxygen
• losing electrons; gaining oxygen

Tags

NGSS.HS-PS1-2

Reduction involves 

• gaining electrons; gaining oxygen
• losing electrons; losing oxygen
• gaining electrons, losing oxygen
• losing electrons; gaining oxygen

Tags

NGSS.HS-PS1-2

Another name for a "oxidation-reduction" reaction is

• chemical reaction
• neutralization reaction
• redox reaction
• nuclear reaction

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-PS1-1

NGSS.HS-PS1-2

Which are examples of reduction?

• I and II
• I and III
• II and III
• I, II and III

Tags

NGSS.HS-PS1-2