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