- Homer notices that his shower is covered in a strange green slime. His friend Barney tells him that coconut juice will get rid of the green slime. Homer sprays half of the shower with coconut juice and he sprays the other half with water. What is the control set-up in this experiment?
Your answer:
coconut juice
appearance of green slime
side of shower sprayed with water
side of shower sprayed with coconut juice
- Problem: How many drops of water can a 5cm x 5cm square of Bounty and Brawny absorb until paper towel is saturated? When you completed this experiment, you counted the number of drops that could fit onto the square until the water overflowed. What is the dependent variable in this experiment?
Your answer:
same technique used
same size paper towel (5cm x 5cm)
paper towel brands
number of drops until saturated
- A student wanted to study the effect of temperature on algal growth in a local stream. Which items are most useful for gathering data in this experiment?
Your answer:
microscopes and written descriptions of weather patterns
pH strips and written observations of stream water
research on the Internet and videotapes of water samples
test tubes, thermometers, and graphs of results
- Problem: Do cars using Exxon gasoline get better gas mileage than cars using other gasoline? What is the independent variable in this case?
Your answer:
same distance traveled
type of gas
same car model used
gas mileage
- Problem: Does using Gold Medal Flour in a recipe allow the cake to bake 20% faster? What should be a constant if a student was to complete this experiment?
Your answer:
trial without Gold medal flour
brand of flour
cakes were baked at the same temperature
time cake took to bake