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Science Project!!!

Science Project!!!. Big Question. How does temperature affect the speed of a chemical reaction???. Hypothesis.

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Science Project!!!

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  1. Science Project!!!

  2. Big Question How does temperature affect the speed of a chemical reaction???

  3. Hypothesis All matter is made of tiny molecules. Molecules are groups of atoms that are chemically stuck together. A water molecule is made of two hydrogen atoms stuck to one oxygen atom. I think hot molecules will react faster than cold molecules because they have more energy

  4. References • http://en.wikipedia.org/wiki/Chemical_kinetics • http://www.purchon.com/chemistry/rates.htm • http://books.google.com/books?id=MCyU91APOP0C&pg=PA38&lpg=PA38&dq=speed+of+chemical+reactions+temperature&source=bl&ots=gHai2MrOD5&sig=vKBA-fS_REFtSvjYOajQqvsyRjg&hl=en&ei=4YulSoCcEuWd8Qb_yZztDw&sa=X&oi=book_result&ct=result&resnum=4#v=onepage&q=speed%20of%20chemical%20reactions%20temperature&f=false • http://books.google.com/books?id=791AAAAAIAAJ&pg=PA81&lpg=PA81&dq=speed+of+chemical+reactions+temperature&source=bl&ots=PfJYcB3h4H&sig=btehNx-2tC8li4czQqvR8HBQqRg&hl=en&ei=4YulSoCcEuWd8Qb_yZztDw&sa=X&oi=book_result&ct=result&resnum=7# • http://www.sciencebuddies.com/science-fair-projects/project_ideas/Chem_p027.shtml?fave=no&isb=c2lkOjEsaWE6Q2hlbSxwOjEscmlkOjMzMTc1NjE&from=TSW

  5. Experiment • Kettle • Ice water • Pyrex measuring cup • Digital thermometer • Stop watch • Alka-Seltzer pils

  6. Instructions • Pour 200mL of iced water into Pyrex cup • Measure the temperature of the water with the digital thermometer and record it. • Quickly drop Alka-Seltzer pill in the water and immediately and start the stop watch • Wait until the pill dissolves and stop the stop watch and record the time • Throw away water

  7. Instructions 6. Mix ice water and boiling water from kettle in the Pyrex cup so that the temperature of the mix is about 10 degrees Celsius warmer than before 7. Repeat steps 2-6 until you use only boiling water 8. Plot a graph of the temperature against the time it takes the pill to dissolve

  8. Experiment

  9. Analysis of Data

  10. Conclusion My experiment proved my hypothesis. The speed of the chemical reaction increased as the water got hotter. However at about 30 degrees the reaction stopped getting faster. This might be because there were so many bubbles that they kept the water away from the pill so it could not react.. If I would repeat the experiment I would try a different chemical reaction that did not give off gas.

  11. Questions??? Some other questions to explore are: does the reaction speed change with other liquids? How much gas is created by the reaction?

  12. THANKS FOR WATCHING!!!

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