Expert Chemistry Tutoring

MS1:

- Remains of ancient plants and animals (1)

- Formed from incomplete decay under high pressure and temperature (1)

MS2:

- Release of carbon dioxide (CO2) into the atmosphere (1)

- CO2 acts as a greenhouse gas, trapping heat (1)

- Greenhouse effect leads to increased global temperatures (1)

MS3:

- Mole calculation: 100 g CH4 / 16 g/mol CH4 = 6.25 mol CH4

- CO2 produced: 6.25 mol CH4 × 1 mol CO2 / 1 mol CH4 = 6.25 mol CO2

- Mass of CO2: 6.25 mol CO2 × 44 g/mol CO2 = 275 g CO2

MS4:

- Unlimited supply (1)

- Do not produce greenhouse gases (1)

- Any two from: solar, wind, hydroelectric, geothermal, tidal (1 per correct answer)

MS5:

- Loss of biodiversity (1)

- Increased soil erosion and flooding (1)

- Reduced carbon dioxide absorption (1)

MS6:

- Energy lost: 1.2 × 109 J - 2.4 × 107 J = 1.176 × 109 J

- Percentage lost: (1.176 × 109 J / 1.2 × 109 J) × 100% = 98%

MS7:

- Resource that can be replaced over a human timescale (1)

- Replenished by natural processes faster than they are used (1)

MS8:

- Sustainable and reliable (1)

- Low carbon emissions (1)

- Does not rely on fossil fuels (1)

MS9:

- 13 (1)

- 8 (1)

- 10 (1)

MS10:

- Converts harmful gases (CO, NOx) into less harmful substances (CO2, N2) (1)

- Uses a catalyst (e.g., platinum, palladium) to speed up reactions (1)

- Reduces emissions and improves air quality (1)