Redox Reactions

Which of the following statements refers to an oxidation process?

• Hydrogen is added to ethene

• Oxygen is removed from carbon dioxide

• Chlorine accepts electrons

• Increase in the oxidation number of magnesium metal

Oxidation involves

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

Reduction involves 

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

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

Which process involves the transfer of electrons?

• double replacement

• neutralization

• oxidation-reduction

• sublimation

During an oxidation-reduction reaction, the number of electrons gained is

• equal to the number of electrons lost

• equal to the number of protons gained

• less than the number of electrons lost

• less than the number of protons gained

In a redox reaction, there is a conservation of

• mass, only

• charge, only

• both mass and charge

• neither mass nor charge

Tags

NGSS.HS-PS1-7

During which process does an atom gain one or more electrons?

• transmutation

• reduction

• oxidation

• neutralization

Tags

NGSS.HS-PS1-1

Which change in oxidation number indicates oxidation?

• -1 to +2

• -1 to -2

• +2 to -3

• +3 to +2