Scientific process

This variable in an experiment is the one being deliberately changed by the scientist. 

• dependent variable
• independent variable
• data
• control group

A student wants to test the effects of type of exercise on heart rate.  What is the dependent variable?

• heart rate
• type of exercise
• amount of exercise
• time of day exercise occurs

What step does every scientific experiment begin with?

• hypothesis
• question/problem
• procedures
• conclusion

What is an observation for this picture?

• The man is scared
• The man is going to get eaten
• There is a man in a kayak
• The man is paddling fast

Shannon is wondering why her skin is red and itchy after taking her bubble bath. Which stage of the scientific method is she in?

• Question or Problem

• Forming a Hypothesis

• Drawing a Conclusion

• Analyzing Data

How many variables should be tested at a time in an experiment?

• Three

• Zero

• Two

• One

Gina wants to test which brand of popcorn pops the most kernels. She picked a store brand, Orville Redenbacher, and PopSecret. All three bags started with the same number of kernels. She popped each for 3 minutes in the same microwave, and then counted the number of kernels left over. What is her independent variable?

• Number of kernels left over

• Brand of popcorn

• Number of kernels before popping

• Length of time cooking

Tags

NGSS.MS-ETS1-3

In the popcorn experiment above, what is one of the controlled variables (constants)?

• time in the microwave

• brand of popcorn

• number of kernels popped

• all of the above are constants

What is a hypothesis?

• an explanation about what you observed

• using your 5 senses to gather data

• the thing changed on purpose in the experiment

• an educated guess about what will happen in the experiment.

What variable comes after the word then in the hypothesis?

• independent variable

• dependent variable