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Variables

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Variables

1. 1. Review<br />Warmup. <br />What is a variable?<br />What is made during photosynthesis?<br />Where is there more oxygen, a lot of photosynthesis or a little. <br />
2. 2. A variable is any factor of an experiment that can be changed. <br />What Kind of plant<br />Water<br />Bags<br />Light<br />Amount of Co2<br />Variable<br />
3. 3. Three types of variables<br />Control- What stays the same<br />Manipulated_What you change before the experiment. <br />Responding_The variable that is observed or measured. <br />
4. 4. What batter is the best? <br />Put them in flashlights<br />Turn on the flashlights<br />Record how long each <br />Flashlight stays on. <br />Battery experiment<br />
5. 5. Battery Experiment<br />Manipulated Variable<br />Batteries<br />Responding Variable (dependent variable)<br />Length light stays on. <br />Control variable<br />Same flashlight<br />Same time started<br />Same temperature<br />
6. 6. Experiment 2<br />What kind of coffee cup keeps coffee warmest. <br />Look for<br />Manipulated variable<br />Control variables<br />Responding variable<br />
7. 7. experiment<br />
8. 8. Manipulated Variables<br />What was the manipulated variable?<br />These are the variables you set up. What is different in the experiment<br />
9. 9. Responding variables<br />What was the responding variable. <br />The responding variable is what you observe. <br />We observed the change in<br />Temperature<br />
10. 10. Control variable<br />What parts of the experiment were kept the same. <br />Always use the same measuring<br /> devices. <br />Same thermometer<br />Same amount of water<br />Same beginning temperature. <br />
11. 11. Amount of variables<br />How many manipulated variables can we have?<br />How come we can only have one?<br />What happens if we had different batteries AND different flashlights, AND different temperatures they were tested in?<br />Do we know which battery is truly better?<br />Could have better flashlight<br />Temperatures can make batteries last longer. <br />YOU CAN ONLY HAVE ONE MANIPULATED VARIABLE AT A TIME. <br />This is so you know what exactly is causing the dependent variable. <br />
12. 12. Elodea experiment. <br />
13. 13. You will do three experiments.<br />For each experiment give:<br />    Hypothesis: What do you expect will give you the most photosynthesis?<br />    Manipulated Variable: Which Variable are you testing<br />    Control Variable: What variables are you keeping the <br /> same?<br />    Responding Variable: Bubbles<br /> <br />Data table, <br />Do 4 tests with 4 different variables and record your data. <br />Conclusion<br />How does this variable affect photosynthesis?, <br />
14. 14. Elodea experiment. <br />
15. 15. Predictions? Hypothesis<br />What color will work best?<br />PlainRed Green Blue, <br />What will happen when we increase CO2<br />What will happen when we increase the light level?<br />
16. 16. Our Lab<br />You will record Data Table. <br />Change only one variable at a time. You then know this effect on the photosynthesis. <br />You will do 4 runs for each variable. <br />Test the effect of Light Level<br />Test the effect of light color<br />Test the effect of carbon dioxide<br />
17. 17. Results<br />Chart your data. <br />List the level of all the variables and the result<br />
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