Show:
Lab Safety
Variables
Experimental Design
Variables and Experimental Design
Bonus Inquiry
100
What should you never do with the chemicals in the science lab?
Sniff, taste, or touch
100
what is the independent variable?
the factor the experimenter changes
100
What are constants?
all the other factors that need to be kept the same
100
What is the dependent variable?
the factor being measured--the results
100
Why do scientists use data tables and graphs?
organize data and find trends so that they can draw conclusions
200
What do you do if a chemical splashes in your eyes?
Go quickly to the eyewash station and rinse for 15 minutes
200
Stephanie and Carol wanted to grow tall, healthy carnations. They decided to use Root-fast fertilizer in different amounts to discover the ideal amount to grow the tallest carnations. What is the dependent variable?
the height of the plants (carnations)
200
Stephanie and Carol wanted to grow tall, healthy carnations. They decided to use Root-fast fertilizer in different amounts to discover the ideal amount to grow the tallest carnations.What is testable question?
How does the amount of fertilizer affect the height of plants?
200
Stephanie and Carol wanted to grow tall, healthy carnations. They decided to use Root-fast fertilizer in different amounts to discover the ideal amount to grow the tallest carnations. What is the independent variable?
the amount of fertilizer
200
What the correct format for the hypothesis for an experiment?
If the IV changes, then a change in the DV.
300
What do you do if you spill or break something?
tell the teacher
300
You have been assigned to design an experiment to determine the effect of light on the growth of tomato plants. What is the dependent variable?
Plant growth
300
A student conducted an experiment to determine if listening to different types of music would affect pulse rate. She thought that pulse rate would change with different types of music. What is the hypothesis?
If a person listens to classical music, then the pulse rate will go down.
300
A company that manufactures a popular multivitamin wanted to determine whether their multivitamin had any side effects. What are the IV and DV?
IV--multivitamin use DV-- side effects
300
How does eating cheese affect getting smarter? For this testable question, what would be the hypothesis? (remember it has to be testable!)
If a person eats cheese daily, then their IQ will go up.
400
What do you need to do with glassware?
check it for chips or cracks
400
Why should other variables be held constant?
So we know that the only thing affecting the results is the IV.
400
Why does conducting multiple trials help reach a more reliable conclusion?
Multiple trials show the data is repeatable and accurate.
400
Mrs. Green recently planted a garden. She wants to know if she planted flowers that attract bees. She thinks the bees like roses best based on her previous experiences. Write a hypothesis.
If the bees are most attracted to roses, then more bees will go to the roses.
400
You have been assigned to design an experiment to determine the effect of light on the growth of tomato plants. What is the testable question? What are the IV and DV? and Name one constant.
How does the amount of light affect the growth of tomato plants? IV=amount of light DV=height of tomato plant amount of water
500
What does everyone need to class on lab days?
shoes without open toes
500
An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and Group B was given caffeine-free soda. One hour after drinking the soda, pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda. What constants have been identified here?
same ages same amount of soda
500
An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and Group B was given caffeine-free soda. One hour after drinking the soda, pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda. What is the independent variable for this experiment?
amount of caffeine in soda
500
An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and Group B was given caffeine-free soda. One hour after drinking the soda, pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda. What is the hypothesis for this experiment?
If people drink caffeinated soda, then their pulse rate will increase.
500
An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and Group B was given caffeine-free soda. One hour after drinking the soda, pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda. What is the dependent variable for this experiment?
the pulse rates of the individuals