Which formula describes the chemical changes that occur and release energy when you start with plant material and then burn it in a fire or "burn" it in a stomach?

Question

BlackTom AI · Accepted Answer

Carbohydrates have the empirical formula CH2O and are oxidized to CO2 and H2O when combusted or metabolically “burned”: CH2O + O2 → CO2 + H2O.

1) Relevant knowledge points and concepts
- Plant material is largely carbohydrates; an empirical formula for many carbohydrates is CH2O (e.g., glucose C6H12O6).
- Combustion and cellular respiration are oxidation reactions: organic carbon is converted to carbon dioxide and hydrogen to water, releasing energy (exothermic).
- Photosynthesis is essentially the reverse process (CO2 + H2O → CH2O + O2).

2) Complete reasoning process step by step
- Represent a generic carbohydrate unit as CH2O.
- Oxidation requires O2 as the oxidant.
- The fully oxidized carbon product is CO2; hydrogen becomes H2O.
- The simplest balanced form capturing that change is CH2O + O2 → CO2 + H2O, which expresses the chemical change and energy release.

3) Calculations and intermediate steps (stoichiometry/balancing)
- Use glucose (C6H12O6) as an example to show balancing:
  C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
- Count atoms: Left — C:6, H:12, O:6 + 12 = 18; Right — CO2: 6×2 =12 O, H2O: 6×1 =6 O; total O = 18; H:12; C:6. Balanced.
- Divide through by 6 to reach the empirical-step form:
  CH2O + O2 → CO2 + H2O
- Check atom balance for the empirical equation: C:1→1, H:2→2, O: (1 + 2) =3 → (2 + 1)=3. Balanced.

4) Why the correct answer is correct
- It captures the fundamental oxidation of carbohydrate carbon to CO2 and hydrogen to H2O, which releases energy in both fire (combustion) and biological oxidation (digestion/respiration).
- The equation is balanced and represents the net chemical change for “burning” plant-derived carbohydrates.

5) Why the other options are incorrect
- Ca+2 + 2HCO3- → CaCO3 + H2CO3 and CaCO3 + H2CO3 → Ca+2 + 2HCO3- are carbonate–bicarbonate equilibria (mineral/aqueous chemistry), not combustion/oxidation of organic matter.
- CO2 + H2O → CH2O + O2 is photosynthesis (the reverse of burning), not the energy-releasing oxidation.
- "Diet Soda + Breath Mint → Boom" is a joke, not a chemical equation representing oxidation of plant material.

6) Conclusion confirming the final answer
- The correct representation of the chemical change that releases energy when plant material is burned or metabolically oxidized is CH2O + O2 → CO2 + H2O, which matches the provided answer.

Which formula describes the chemical changes that occur and release energy when you start with plant material and then burn it in a fire or "burn" it in a stomach?单项选择题

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