SQUADS #4 CPW 9 th Grade Science Learning Intentions - Today, I am going to address these College Readiness Standards in Science: 1. Interpretation of Data 13-15 2. Interpretation of Data 24-27 3. Scientific Investigation 24-27 4. Scientific Investigation 20-23 5. Scientific Investigation 24-27 6. Interpretation of Data 16-19 7. Evaluation of Models, Inferences, and Experimental Results 20-23 Success Criteria I know I am successful when I can select data from a simple graph, understand the methods used in a simple experiment, determine the experimental conditions that would produce specified results, and find basic information in a brief body of text.
Quick Note! Today s questions are based on the printed passage you will receive shortly. After reading your passage individually or as a group, choose the best answer to each question. You may refer to the passages as often as necessary. You have 2 Minutes to read your passage!
9 th Grade Science #1. A solution of sugar in water is NOT supersaturated when 300 g of sugar and 100 g of water are mixed at a temperature of: A. 20 degrees Celsius. B. 40 degrees Celsius. C. 50 degrees Celsius. D. 70 degrees Celsius.
Correct Answer: D A supersaturated results when the amount of solute dissolved exceeds the solubility at a given temperature. At the temperatures listed in choices A, B, and C, the solutions are supersaturated. At 70 degrees Celsius, the solution is NOT supersaturated.
9 th Grade Science #2. In order for 250 g of sugar to completely dissolve in 100 g of water, the temperature of the solution would have to be at a minimum of: F. 15 degrees Celsius. G. 25 degrees Celsius. H. 45 degrees Celsius. J. 65 degrees Celsius.
Correct Answer: H Below 45 degrees Celsius (at 15 and 25 degrees), the sugar will not dissolve completely. At 65 degrees, the sugar will dissolve; however, 65 degrees is above the minimum temperature required to dissolve the sugar.
9 th Grade Science #3. At 100 degrees Celsius, the solubility of sugar in water would most likely be: A. less than 250 g of sugar in 100 g of water. B. between 250 g of sugar and 350 g of sugar in 100 g of water. C. between 350 g of sugar and 400 g of sugar in 100 g of water. D. more than 400 g of sugar in 100 g of water.
Correct Answer: D This question is asking you to make a prediction based on the given data. The solubility of sugar in water increases as the temperature increases. Choices A and B can be ruled out because they do not follow this trend. Choice C is incorrect because it does not follow the shape of the curve on the graph.
9 th Grade Science #4. In order to produce rock candy at 20 degrees Celsius from a solution of 300 g of sugar not completely dissolved in 100 g of water, the solution must be: F. first heated above 60 degrees Celsius, then slowly cooled to 20 degrees Celsius. G. slowly stirred at 20 degrees Celsius. H. slowly cooled to 0 degrees Celsius. J. slowly cooled below 0 degrees Celsius, then heated to 20 degrees Celsius and stirred.
Correct Answer: F The question could be answered by going back to the passage. Rock candy is made by first completely dissolving the excess sugar, at a high temperature, then slowly cooling to room temperature. Choices G, H, and J don t describe heating, followed by slow cooling.
9 th Grade Science #5. How much sugar must be added to a solution of 50 g of sugar in 100 g of water at 45 degrees Celsius in order for the solution to be supersaturated? A. more than 10 grams B. more than 20 grams C. more than 100 grams D. more than 200 grams
Correct Answer: D In order for a solution to be supersaturated, the amount of sugar has to exceed solubility. Therefore, a total of more than 250 g is necessary. If a solution already contains 50 g of sugar, more than 200 grams are required.
9 th Grade Science #6. Solubility is defined as: F. a supersaturated mixture. G. a mixture that is made by dissolving a solute in a solution. H. the amount of solute that can be dissolved in a solvent at a given temperature. J. the temperature that causes supersaturation.
Correct Answer: H According to the passage, solubility is defined as the amount of solute that can be dissolved in a solvent at a given temperature.
9 th Grade Science #7. What is the approximate difference in temperature for the solubility of 200 grams of sugar/100 grams of water and 250 grams of sugar/100 grams of water? A. 10 degrees Celsius B. 20 degrees Celsius C. 30 degrees Celsius D. 40 degrees Celsius
Correct Answer: B The solubility of 200 grams of sugar/100 grams of water is 200 degrees Celsius. The solubility of 250 grams of sugar/100 grams of water is 40 degrees Celsius. Therefore, the difference in temperature is 20 degrees Celsius.