Redox Reactions

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

• Increased
• Decreased
• Remained Constant
• Varies Randomly

Tags

NGSS.HS-PS1-2

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

• Oxidized
• Reduced
• Neutralized
• Precipitated

Tags

NGSS.HS-PS1-2

In the reaction 2Ca + O₂ --> 2CaO, calcium is __________

• Reduced

• Synthesized

• Oxidized

• None of the above

In the reaction Zn + H₂O --> ZnO₂ + H₂ which element, if any, is oxidized?

• Zinc

• Hydrogen

• Oxygen

• None

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

• a chemical reaction

• redox

• oxidation

• reduction

Tags

NGSS.HS-PS1-2

An increase in oxidation number is considered

• more acidic

• reduction

• less basic

• oxidation

A decrease in oxidation number is considered

• more concentrated

• reduction

• oxidation

• more dilute

What is a half-reaction of this equation, Na + Cl --> NaCl ?

• Cl + e^- --> Cl^-

• Cl - e^- --> Cl^-

• Na --> Na + e^-

• Na° + Cl°--> Na⁺¹Cl^-1

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Which statement is true:
Mg → Mg²⁺ + 2e^–

• Mg gains 2 electrons
• Mg_²⁺ loses 2 electrons
• Mg loses 1 electron
• Mg loses 2 electrons

Tags

NGSS.HS-PS1-2

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-
• Pb⁴⁺ + 2e^- →Pb²⁺
• 2O^-2 →O₂ + 4e^-
• Fe + 3e^- →Fe³⁺

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1