Unit Calendar: Subject to Change

Transcription

1 SOL Objectives LS 1 A) Data are organized into tables showing repeated trials B) Variables are defined C) Metric units are used E) Sources of error are identified F) Dependent variables, independents variables, and constants are identified G) Variables are controlled to test hypotheses and trials are repeated J) An understanding of the nature of science is developed and reinforced Unit Calendar: Subject to Change

2 Notes Page 2 1. A student conducted an experiment on plant growth that required adding about one cupful of liquid fertilizer to several plants each week. In order to accurately measure the fertilizer given to each plant, the fertilizer volume should be measured in: A. Cubic meters B. Milliliters C. Cubic feet D. Kiloliters 2. The diagram shows a graduated cylinder containing water. From which position will the most accurate measure of the volume of the water be made? A. Position 1 B. Position 2 C. Position 3 D. 3. Some snapdragon seeds were studied in the experiment above. The seeds were placed in a dish lined with a moist paper towel. Which of these is the independent (manipulated) variable in this experiment? A. The type of seed B. The amount of water used C. The number of sprouts D. The temperature of each dish 4. A student wanted to test the hypothesis that adding antifreeze to water lowers the freezing point of water. The student found that pure water froze at 0 o C, while the water/antifreeze mixture froze at -20 o C. In order to confirm the results, the student should repeat the experiment using a. A container of a different size b. A different amount of antifreeze c. A different amount of water d. Exactly the same set-up as the first experiment 5. Suppose that in a certain area, mice are the main food source for wolves. Based on the graph, in which year would there be the least amount of competition among wolves for food? A B C D A. B. C. 6. An experiment determined that 20g of mass were gained by a mouse on a corn diet, 15 g by a mouse on a rice diet, and 18 g for the mouse on a grain diet. The corn-fed mouse started out at 95g, the rice-fed at 98g, and the grain -fed at 92g. Which of the following tables describes this data and any other data that can be directly computed from these numbers? D.

3 Notes Page 3 Hypothesis Variable Independent Variable Dependent Variable Constants Control Conclusion Length Mass Volume Temperature

4 A prediction If then Anything that changes The part of the experiment that I, the experimenter, can change The results or outcome of the experiment Anything that stays the same The part of the experiment that is used as comparison. What you have found out as a result of the experiment. Distance Amount of matter in an object Amount of space an object takes up Amount of heat in an object

5 Notes Page 4 The Mythbusters, Adam and Jamie, wanted to learn whether diet coke and mentos or diet coke and salt made a better explosion. They formed a : if dropping mentos in diet soda makes it explode, then dropping salt in diet soda would cause a small explosion. They decided to conduct an experiment. The were plain water and mentos and plain water with salt, because that would not react. They made sure to have the same of diet soda (350mL), and to let the reactions run for the same amount of time. The time and the amount of liquid are the in the experiment because they stay the same. They also made sure that the of the soda was the same, 25 degrees Celsius. The are things that change in the experiment. Jamie identified the item to be added (salt, mentos) as the. Adam decided that distance, or, traveled by the soda s fizz was the. They used the triple beam balance to take the of the mentos and salt to make sure they had 5 grams of each, then ran the experiment. Their was somewhat surprising since they found that table salt actually yielded a larger reaction than mentos!

6 Notes Page 5 Pick 3 objects in the room. Gather 2-3 pieces of quantitative data and 2-3 pieces of qualitative data about each item. Object Quantitative Data Qualitative Data

7 Notes Page 6 DATA and Measurement Notes

8 Notes Page 7 1. If I increase the temperature on the grill from 176 ºC (350ºF) to 250ºC (482ºF), then my chicken will cook 15 minutes faster. 2. If I freeze 45mL of water, then the volume will increase by at least 3mL. 3. If I add ice to my drink, then the temperature will decrease by at least 15 degrees. IV: DV: IV: DV: IV: DV: 1. Pick one of the following potential experiments. 2. Determine the independent variable, dependent variable, hypothesis, and constants (at least 3). Choice 1: The Effect of Science Quiz Scores on the Mood of a 7 th Grade Student Choice 2: The Effect of Player Injuries on a Football Team s Win-Loss Record Choice 3: The Effect of Hours of Practice on the Success of a Dancer Choice 4: The Effect of Tardiness on a Student s Grade My choice: IV: DV: Hypothesis: Three Constants:,, Do it yourself: I want to try: IV: DV: Hypothesis: Three Constants:,,

9 Experimental design Notes Notes Page 8 _ I change the IV! I measure the DV!

10 Notes Page 9 Graph the following data Food Number of Hairballs Friskies 16 Purina 15 Fancy Feast 25 Iams 12 Natural Organic 13 Science Diet Hairball Control 8 Puss In Boots on Science Diet Number of Hairballs Week 1 10 Week 2 9 Week 3 8 Week 4 7 Week 5 8 Week 6 7 Week 7 8

11 GRAPHING Notes Page 10 When graphing time,

12 Notes Page 11 List the 7 components of a good data table and give an example for each Set up a data table (DO NOT INCLUDE DATA) so that you would be ready to collect data for the following experiment. If I add 4g of salt to 500mL of water, it will boil faster than water with no salt added.

13 Dealing with data notes Notes Page 12

14 Notes Page 13 Goal #1: I will understand metric units and be able to select the appropriate metric measurement tool to gather quantitative or qualitative data , 3., , Goal #2: I will understand identify independent variables, dependent variables, constants, and sources of error in an experiment ,, Goal #4: I will organize data into tables showing repeated trials and means. 1.,,,, 2. Personal reflections: school Personal reflections: life