Mofu Lin Ms. Conte 15/3/12 IB Chemistry Soda can calorimeter(Energy content of food) Lab report Introduction We‚ human needs energy to live and for movements. Thus‚ we eat and combust food to release its heat energy in our bodies. In this experiment‚ we will determine how much heat energy released when we eat snack foods such as popcorn or potato chips. This lab includes three burning tests of different foods with different energy contents. Calorimetry is the science associated with determining the
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For all 3 weeks‚ the calorimeter oval bucket (#13) was filled up with roughly 2.000 kg of DI water. The temperature of the water was roughly around room temperature (depending how long it was sitting in the room). The bucket was then placed in the calorimeter in a certain way. At the bottom of the bucket‚ there were 3 “dents” which were aligned with the dents at the bottom of the calorimeter jacket (#14). The oxygen combustion bomb (#15) was then opened and
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Which Substance Melts Ice the Fastest? (Salt‚ Sugar‚ or Pepper) Acknowledgments Question Which substance melts ice the fastest (Salt‚ Sugar‚ or Pepper)? Background Information Water can be found as a liquid‚ solid‚ or gas. Water is made up of tiny particles which are hard to see in solids. A solid is matter that has a shape and usually takes up space. Its particles are closely packed together. The particles have some energy. They move back and forth‚ but they do not change places
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Wood frog-protects its organs by freezing solid. Ice wine-frozen grapes-the shrunken nature of the grapes is due to water loss-the less water in grapes‚ the fewer ice crystals there are to damage the delicate membranes of the fruit. Sugar is a natural antifreeze- this is probably why people developed diabetes during ice age (younger dryas) and people nowadays are more frequently diagnosed with diabetes from November to Freburary‚ when it is colder. Natural selection survival rule-LOSE THE FINGER
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washer fluid should be an anti ice and fog mixture. Use your washer fluid on a regular basis; using your wipers and ice scrap on a dirty windshield can result in scratches and can even chip your windshield‚ which is why it is so important to keep your windshield clean during the winter months. Use Your Ice Scraper To Remove Ice Do not use your credit card‚ a metal spatula or a kitchen knife to remove ice from your windshield. These tools are not designed to remove ice and keep your windshield safe
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Earth was covered by ice and snow from pole to pole for long periods of time in the past. The average temperature on the surface was about -50° and at the equator it was about -20°‚ which is roughly the temperature of Antarctica today. This is because the solar radiation from the Sun is reflected back into space due to the icy surface of the Earth. The oceans play a major role on the temperature fluctuation associated with day and night and because the oceans have a layer of ice over them‚ the temperature
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change in average global temperature. The main cause of global warming is thought to be the ’greenhouse effect’ that is mainly caused by us humans. With an increase in temperature glaciers worldwide are melting faster than the time taken for new ice layers to form‚ sea water is getting hotter and expanding causing sea levels to rise‚ rivers overflow due to melting glaciers causing floods‚ forest fires are on the rise‚ and innumerable undesired effects are taking place due to global warming.
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Lab 15: Chemical and Physical Properties Introduction Pre-lab Questions 1. Determine if the following scenarios represent a chemical or physical property. a. Dry ice (CO2) sublimes (changes from a solid to gas) at -78 ⁰C at standard atmospheric pressure. Physical b. Iron metal rusts in moist conditions. Chemical c. Hydrogen peroxide decomposes in the presences of light or heat. Chemical d. Silver metal does not react with hydrochloric acid (HCl). Chemical e. Copper is a
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that is common with most matter just before solidification. Once the water temperature has dropped to 0° C‚ the rows of molecules connect at the ends to form an open-ended hexagon. Because of the empty spaces into the middle of these hexagons‚ the ice takes up more space than the same amount of liquid water. The net result is approximately 9% more volume. The disadvantages of this peculiar property are many. For example‚ if a container holding water is made of something rigid‚ like metal or glass
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Wisconsin Glaciation Effects on Minnesota A glacier is a large piece of ice on land‚ normally formed over time. A glacier forms when snow falls and compresses together to form the large mass of ice over time. The glaciers can move because of gravity‚ and the smoothness of the glacier. Glaciers were present in Minnesota thousands of years ago‚ and as they retreated they left behind large amounts of glacier meltwater and various landforms still present today.Glaciers are both constructive and
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