Identify the variables and research questions.

Eddie put one two-inch steel nail into each of six test tubes. He added water to three of the test tubes and vinegar to the other three. In each test tube, he completely covered the nail with the same volume of liquid. Eddie checked the nails for rust at the same time every day. He recorded how many days it took each nail to become completely covered in rust. Then, he compared the number of days it took nails to rust in water to the number of days it took nails to rust in vinegar.
Please identify the IVs and DVs in this experiment, and form a research question for this investigation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Kristen poured four ounces of water into each of six glasses. Kristen dissolved one tablespoon of salt in each of three glasses, and did not add salt to the other three. Then, Kristen placed an egg in one glass and observed if the egg floated. She removed the egg and dried it. She repeated the process with the other five glasses, recording each time if the egg floated. Kristen repeated this test with two more eggs and counted the number of times the eggs floated in freshwater compared to salty water.

Please identify the IVs and DVs in this experiment, and form a research question for this investigation.

Tags

NGSS.MS-LS2-1

Alice planted 25 tomato seeds one-half inch below the soil surface in each of six pots. Alice added an equal amount of fertilizer to three of the six pots. She placed the pots in a plant growth chamber where all the seeds experienced the same temperature, amount of light, and humidity level. After two weeks, Alice counted the number of seedlings that grew in each pot. She compared the number of seedlings in the pots with fertilizer to the number of seedlings in the pots without fertilizer.

Please identify the IVs and DVs in this experiment, and form a research question for this investigation.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Chandler placed a ping pong ball in a catapult, pulled the catapult's arm back to a 45° angle, and launched the ball. Then, Chandler launched another ping pong ball, this time pulling the catapult's arm back to a 30° angle. With each launch, his friend Zane measured the distance between the catapult and the place where the ball hit the ground. Chandler and Zane repeated the launches with ping pong balls in four more identical catapults. They compared the distances the balls travelled when launched from a 45° angle to the distances the balls travelled when launched from a 30° angle.

Please identify the IVs and DVs in this experiment, and form a research question for this investigation.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Turner set up five pairs of platform bird feeders around his yard. He filled one feeder in each pair with sunflower seeds and the other feeder with flax seeds. For one week, Turner watched cardinals visiting the feeders during the same hour each morning. During his observations, Turner counted the number of visits by cardinals to feeders with sunflower seeds and the number of visits by cardinals to feeders with flax seeds.

Please identify the IVs and DVs in this experiment, and form a research question for this investigation.

Tags

NGSS.MS-LS2-1

Wayne set up six tanks with equal volumes of 20°C water. Three of the tanks contained water with a high salt content of 30 parts per thousand and three contained water with no salt. Wayne added an equal amount of green algae to each tank. He allowed the algae to grow in the tanks for two weeks. Then, he measured the amount of algae in each tank.

Please identify the IVs and DVs in this experiment, and form a research question for this investigation.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4