Balance the following reaction: C3H7OH + O2 âž” CO2 + H2O Balance the following reaction: CH4 + O2 âž” CO2 + H2O In the equation above, 31.2 kJ of energy is released for every gram of methane burned. How much energy is released if 4,500 grams of methane is burned? Balance the following reaction: Al + AgNO3 âž” Ag + Al(NO3)3 Consider this reaction: Al + 3 Ag+ âž” 3 Ag + Al3+ Write the oxidation half-reaction and the reduction half-reaction for that equation (show the electrons). Oxidation: Al âž” Al3+ + 3e- Reduction: 3 Ag+ + 3e- âž” 3 Ag When I use energy, I can be a faithful steward of the earth’s resources by… (Tell me what you will do and why that makes you a faithful steward of the earth’s resources.)
The Correct Answer and Explanation is:
1. Balance the following reaction:
C₃H₇OH + O₂ → CO₂ + H₂O
Balanced equation:
C₃H₇OH + 4.5 O₂ → 3 CO₂ + 4 H₂O
To eliminate the decimal, multiply all coefficients by 2:
2 C₃H₇OH + 9 O₂ → 6 CO₂ + 8 H₂O
2. Balance the following reaction:
CH₄ + O₂ → CO₂ + H₂O
Balanced equation:
CH₄ + 2 O₂ → CO₂ + 2 H₂O
3. In the equation above, 31.2 kJ of energy is released for every gram of methane burned. How much energy is released if 4,500 grams of methane is burned?
Energy released = 31.2 kJ/g × 4,500 g = 140,400 kJ
Answer: 140,400 kJ of energy is released when 4,500 grams of methane is burned.
4. Balance the following reaction:
Al + AgNO₃ → Ag + Al(NO₃)₃
Balanced equation:
2 Al + 6 AgNO₃ → 6 Ag + 2 Al(NO₃)₃
5. Oxidation and Reduction half-reactions:
Overall equation:
Al + 3 Ag⁺ → 3 Ag + Al³⁺
- Oxidation half-reaction:
Al → Al³⁺ + 3e⁻ - Reduction half-reaction:
3 Ag⁺ + 3e⁻ → 3 Ag
6. When I use energy, I can be a faithful steward of the earth’s resources by…
When I use energy, I can be a faithful steward of the earth’s resources by using it wisely and minimizing waste. For example, I will turn off lights and appliances when not in use, choose energy-efficient devices, and support renewable sources like solar or wind power. By doing these things, I reduce the amount of fossil fuels burned, which helps limit greenhouse gas emissions and air pollution. Being mindful of energy use protects the environment and preserves natural resources for future generations. It also shows respect for the Earth, which is a gift we have a responsibility to care for. Using energy responsibly reduces the strain on ecosystems and supports a healthier, more sustainable planet.
