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Chemistry

Chemistry. Carbon Dioxide in the Atmosphere. CO 2 is emitted in the atmosphere in many ways Naturally  carbon cycle, volcanic outgassing , Human activities  burning fossil fuels CO 2 needed for sustaining life on Earth

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Chemistry

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  1. Chemistry

  2. Carbon Dioxide in the Atmosphere • CO2 is emitted in the atmosphere in many ways • Naturally  carbon cycle, volcanic outgassing, • Human activities burning fossil fuels • CO2 needed for • sustaining life on Earth • controlling the Earth's climate by trapping heat in the atmosphere • essential to photosynthesis in plants and other photoautotrophs • a prominent greenhouse gas

  3. Each year, CO2 Emission Increases… http://en.wikipedia.org/wiki/File:Global_Carbon_Emissions.svg

  4. Rates & Increases • Annual fluctuation of about 3–9 ppmv which roughly follows the Northern Hemisphere's growing season • 2009 average global CO2 concentration≈ 0.0387% 387 parts per million by volume (ppmv) • Resultcarbon dioxide has gradually accumulated in the atmosphere & its concentration is 39% above pre-industrial levels (2009)

  5. Greenhouse Gas Remediation Projects • ObjectiveRemove greenhouse gases from the atmosphere, and thus tackle the root cause of global warming • Offer comprehensive solution • Will take many years • Overlap with carbon capture/ CO2removal and carbon sequestation projects

  6. Techniques include… • Ocean nourishment • Eg. Iron fertilisation of the oceans • Creating biochar (anaerobic charcoal) and burying it to create terra preta • Bio-energy with carbon capture and storage • Carbon air capture to remove carbon dioxide from ambient air

  7. Carbon Dioxide Removal • The removal of CO2 from ambient air by carbon dioxide scrubbing • Regarded as greenhouse gas remediation, which is a branch of geoengineering • Proposed methods include: • Planting artificial trees • Build “scrubbing towers” ≈ filter towers • Quicklime process  calcium oxide

  8. Advantage & Disadvantages • Advantage • removes the need for CO2 piping to transport the gas to underground storage sites • allows the use of renewable energy and optimal storage sites • Disadvantage • Can’t capture at large, point source emitters (eg. power plants), as it is likely to be more efficient and cheaper to capture and store carbon dioxide from more concentrated streams

  9. Carbon Dioxide Scrubbing Lab Objective: To see if the carbon dioxide produced by the marble and hydrochloric acid solution will be absorbed by the potassium hydroxide solution by observing the change in pH level using the universal indicator.

  10. Materials • Marble • Spoon • Test tube • U-tube • 2 test tube corks with tube connected (that fits the test tube and the U-tube) • 2 test tube clamps • 2 graduated cylinders • 50mL potassium hydroxide solution • 10 drops universal indicator • 10mL hydrochloric acid

  11. Procedure • Pour a ½ spoon full of marble into a test tube and hold it on a clamp. • In a U-tube, pour in 50mL of the potassium hydroxide solution • Add 10 drops of universal indicator into #2 and make sure the indicator gets mixed in thoroughly and hold the U-tube on another clamp. • Take note of the colour if the potassium hydroxide solution and its pH level. • Plug the one of the corks that are connected by a tube with one opening of the U-tube. • Pour 10mL of hydrochloric acid into the test tube with the marble and quickly plug the other connected cork in this test tube. • Make close observations of the reactions that are made and the changes in colour of the potassium hydroxide solution.

  12. Carbon Dioxide Scrubbing Lab Video **Speed is fast-forwarded (150%)

  13. Results After mixing: Colour= yellow pH level≈ 6 (neutral) In the beginning: Colour= blue pH level≈ 12 (alkali/basic) http://teamstudent.com/2010/08/15/a-first-hand-investigation-to-prepare-and-test-a-natural-indicator/

  14. Discussion for Chemistry Lab Chemical Equation: BASIC NEUTRAL WEAK ACID

  15. Reflection • Positive • We contacted each other quite often and exchanged a lot of ideas especially in the beginning • Each and every one of us did our individual work that we had to complete • Negative • After the work day, the communication stopped for a while as we were working on our individual parts • We didn’t reflect back on the sources that we used

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