Do Now

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Do Now - PowerPoint PPT Presentation

Do Now. Justify why we use fossil fuels in power plants, even if they are bad for the environment. Why Not Battery Power?. Introduction. We hear a lot about the negative aspects of fossil fuels in the news

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PowerPoint Slideshow about 'Do Now' - barid

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Presentation Transcript
Do Now
• Justify why we use fossil fuels in power plants, even if they are bad for the environment.

Why Not Battery Power?

Introduction
• We hear a lot about the negative aspects of fossil fuels in the news
• Being so progressive and environmentally-minded, we are going to design a house which runs completely on batteries
• Unfortunately, high-voltage batteries can be expensive, so you need to try to keep the cost as low as possible
• We have a 7 devices in our house that we need to power, and each device has a minimum voltage that it needs to run at (on the next slide)
• You also have a list of half-reactions in front of you, along with their reduction potentials, and cost per unit
• Your goal is to come up with the most cost-efficient combination of batteries to power all of the devices in your house
List of Devices and Minimum Required Voltages
• 1) Pick two half-reactions
• 2) Determine the number of batteries required
• 3) Calculate the cost for each of the half-cells
• 4) Calculate the total battery’s cost
• 5) Multiply by the number of batteries required (if necessary)
• Alarm clock: 0.6V
• Microwave: 2V
• TV: 24V
• Xbox 360: 7V
• Water heater: 3V
• Laptop computer: 12V
Environmental Impact of Heavy Metal Mining
• Heavy metals tend to gather in clusters underground
• If you dig to reach heavy metals that you want, you can also disturb metals you don’t (e.g., arsenic, mercury)
• If those metals end up reaching groundwater, it can have far-reaching environmental impacts
• Copper mine near Vancouver, British Columbia, Canada
Other Environmental Impacts of Heavy Metal Mining
• Cost and danger of digging tunnels through the ground can be extremely high
• Other methods besides tunneling:
• Strip mining (deforestation)
• Mountaintop removal mining
• Fracking (hydraulic fracturing)
Battery Recycling
• Even if we were able to get all of these batteries, what do we do with them after we are done?
• Could just dump them in the trash – basically free
• Where would chemicals in the landfill end up going?
• Recycling the can be very expensive (in the chemistry classroom as well)