Carbon footprint calculations It is the middle of winter and I have the option of buying tomatoes grown in greenhouses in California or tomatoes grown in Mexico and transported to the US. Use the information below to calculate the carbon footprint of 1kg of tomatoes from California and from Mexico to work out which would have the lowest carbon footprint. (Tip: 1 ton = 1000 kg) a) Californian tomatoes (3) Electricity required to heat greenhouse to grow 1 ton of tomatoes = 16,000 kWh Emission factor for electricity generated using natural gas = 0.15 kgCO2eq / kWh Distance from farm to store and back = 20 miles One diesel truck can carry 1 ton of tomatoes Emission factor of diesel truck = 0.08 kg CO2eq per mile Emissions for 1kg of California tomatoes = __________________________________ b) Mexican tomatoes (3) Tomatoes are grown outside but groundwater must be used for irrigation. Diesel engines are used to power groundwater pumps for irrigation and they produce 160 kgCO2eq for every 1 ton of tomatoes grown. Distance from farm to store and back = 2400 miles One diesel truck can carry 1 ton of tomatoes Emission factor of diesel truck = 0.08 kg CO2eq per mile Emissions for 1kg of Mexican tomatoes = __________________________________
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
- Carbon footprint calculations
It is the middle of winter and I have the option of buying tomatoes grown in greenhouses in California or tomatoes grown in Mexico and transported to the US. Use the information below to calculate the carbon footprint of 1kg of tomatoes from California and from Mexico to work out which would have the lowest carbon footprint. (Tip: 1 ton = 1000 kg)
- a) Californian tomatoes (3)
Electricity required to heat greenhouse to grow 1 ton of tomatoes = 16,000 kWh
Emission factor for electricity generated using natural gas = 0.15 kgCO2eq / kWh
Distance from farm to store and back = 20 miles
One diesel truck can carry 1 ton of tomatoes
Emission factor of diesel truck = 0.08 kg CO2eq per mile
Emissions for 1kg of California tomatoes = __________________________________
- b) Mexican tomatoes (3)
Tomatoes are grown outside but groundwater must be used for irrigation.
Diesel engines are used to power groundwater pumps for irrigation and they produce 160 kgCO2eq for every 1 ton of tomatoes grown.
Distance from farm to store and back = 2400 miles
One diesel truck can carry 1 ton of tomatoes
Emission factor of diesel truck = 0.08 kg CO2eq per mile
Emissions for 1kg of Mexican tomatoes = __________________________________
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