The topic is The Effect of Temperature on the Rate of Dissolving. In this experiment‚ the scientist will research how the temperature of water will affect the rate of dissolving of different chemical solutes. The independent variable in this experiment are the different types of solutes used and the different temperatures the solvent will be adjusted to‚ and the dependent variable is the amount of weight of the solvent after the solute has dissolved in it. The constants are the same cups used to
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WHAT INFLUENCES ONLINE CLASSES HIGH ATTRITION RATE by Lora Hines Bachelor of Science in Business Education December 1984 College of Education A Research Paper Submitted in Partial Fulfillment of the Requirements for the Master of Science in Education Degree Department of Workforce Education and Development In the Graduate School Southern Illinois University – Carbondale December 1‚ 2011 TABLE OF CONTENTS Chapter Page
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Description To investigate the effect on caffeine on heart rate of water fleas and to understand the risk of high level consumption of caffeine to the health of the human circulatory system and nervous system. Preview Diagram 1: Chemical structure of caffeine Image source: http://ismaastricht.wikispaces.com/file/list The images above show the chemical structure of caffeine which has a chemical formula of C8H10N4O2. Caffeine was named by the International Union of Pure and Applied Chemistry
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6.05 Rate and Collision Theory Does surface area affect dissolving of Alka-Seltzer tablets? Materials: 1. solo cups 2. Alka-Seltzer tablets 3. Timer 4. Measuring Cup 5. Thermometer Procedures: 1. I placed out two of my solo cups on the counter 2. Then I put 1 cup of room temperature water into each cup. 3. Then put one Alka-Seltzer Tablet in one cup and time it until it dissolves completely. 4. In the second cup I put in a crushed up Alka- Seltzer tablet and timed it until it
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do you jungle your sports‚ your social life‚ school‚ social media‚ your homework………………. and a baby. These are the issues teenage parents are facing. Not only is this hurting younger kids but also detrimental to the schools as well. School dropout rates are higher than before. Almost 3 out of 10 teen American girls will get pregnant at least once before they hit age 20‚ that’s nearly 750‚000 teen pregnancies every year. Parenthood is the leading reason that teen girls drop out of school. 8 out of
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sediment can then be determined. As the original concentration of glucose us known the rate of uptake can be determined. HYPOTHESIS: “High concentrations of glucose will cause a higher rate of uptake in yeast cells” PREDICTION: As the glucose concentration increases‚ the rate of uptake by the yeast cells will also increase. However‚ at a certain point‚ all of the yeast’s active sites will be occupied‚ so the rate of uptake will even out. This point is known as Vmax. PLAN: To test this hypothesis
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Investigation of the rate of photosynthesis of pondweed. Research question: How does the concentration of sodium bicarbonate relate to the amount of oxygen produced by Elodea (Canadian pond weed) in the process of photosynthesis? Hypothesis: If there is an increase in concentration of sodium bicarbonate the amount of oxygen produced will increase because the sodium bicarbonate concentration will increase the carbon dioxide levels. Independent variable- Concentrations of sodium bicarbonate (8%
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Introductory Activity Heart Rate (pulse) Have the students find their heart pulse on the carotid artery of the neck. Use the index and middle finger to measure the pulse. Count the number of beats for 6 seconds and add a zero to the end of that number. This number represents the heart beats per minute. The heart pulse is located on either side of the wind pipe‚ next to the voice box. Allow the students to practice measuring their pulse to determine their resting heart rate. Explain that they need to
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Chemistry Coursework Rates of Reaction Investigation Introduction In this investigation I am going to be investigating the reaction between marble chips and hydrochloric acid‚ and to see what differences in the rate of this reaction arise when different concentrations of acid are used. Below is the word equation for this reaction: Calcium Carbonate + Hydrochloric Acid = Calcium Chloride + Carbon Dioxide + Water Below is the fully balanced chemical equation for this reaction. CaCo3
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well as the H2O2 solution Dependent Variable: Rate of reaction (cm3/second) The gas syringe (± 0.5) is used to measure the amount of oxygen produced from the catalase reaction. A rubber stopper is used to ensure that there is a closed system and no O2 escapes Controlled Variables: Substrate ( H2O2 ) Concentration and Quantity The same pipette will be used to measure
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