CHAPTER 14

The process by which plants generate glucose is known as _____.

•  

  photosynthesis

   

• respiration

• the haber process

• digestion

• russting

Which substance acts as the cathode in the lead-acid automobile battery?
Pb + PbO₂ + 4H⁺ + SO₄²⁻ → 2PbSO₄ + 2H₂O

• Pb

• PbO₂

• 4H⁺

• SO₄²⁻

• H₂O

Which of these is not an oxidation-reduction reaction?

• CuO(s) + H₂(g) → Cu(s) + H₂O(l)

• CO₂(g) + H₂(g) → CO(g) + H₂O(l)

• I⁻(aq) + NO₃⁻(aq) → NO(g) + I₂(s)

• Mn(OH)₂(s) + MnO₄⁻ (aq) → MnO₄²⁻ (aq)

• HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O (l)

Identify a true statement about photosynthesis.

 

 

• 
  Carbon is oxidized during photosynthesis.

• Carbon dioxide and water are produced during photosynthesis.

• Photosynthesis is an endothermic process.

• Photosynthesis helps in the oxidation of glucose.

• Photosynthesis can take place in the absence of sunlight.

During oxidation-reduction reactions, the substance that loses electrons is _____and the substance that gains electrons is _____.

• oxidized; reduced

• reduced; oxidized

• reduced; dissolved

• reduced; accelerated

• oxidized; dissolved

Which of these statements correctly explains why batteries run out of energy?

• The battery solutions boil off.

• The battery solutions solidify.

• The battery reactants are used up.

•  

  The external circuit becomes corroded.

• The battery salt bridge reacts with the reactants.

Which of these is correctly associated with the anode?

I. Electrode with negative charges

II. Electrode at which a substance loses electrons

III. Electrode at which reduction occurs

• I only

• II only

• I and II

• I and III

• I, II,III

Which substance acts as the anode in the lead-acid automobile battery?
Pb + PbO₂ + 4H⁺ + SO₄²⁻ → 2PbSO₄ + 2H₂O

• PbO₂

• Pb

• H₂O

• SO₄²⁻

• 4H⁺

Redox reactions involve the transfer of _____.

• HYDROGEN

• OXGEN

• ELECTRON

• NEUTRONS

• PROTONS

Which of these processes can occur at the anode in an electrochemical cell?

• Br₂ + 2e⁻ → 2Br⁻

• Zn → Zn²⁺ + 2e⁻

• Cu²⁺ + 2e⁻ → Cu

•  

  Na⁺ + 1e⁻ → Na

• Pb⁴⁺ + 2e⁻ → Pb²⁺