Big Idea

Why was it important for the group to publish their procedures and conclusions from their investigation? 

• So other farmers are able to decide which crop to plant.

• So other scientists are able to replicate the investigation.

• So other farmers are able to grow crops in their own section.

• So other scientists are able to record the amount of watering that occurred.

Which statement is a scientific observation of the picture from Chapter 2?

• The boot weighs a lot. 

• The boot is colored white.

• The boot print is not smooth.

• The temperature of the boot is very cold.

A teacher writes the following note on a student’s experimental design: “You did not identify a control group for your experiment.” Why is it important for a scientist to identify a control group for their experiment?

• A control group is required to keep every variable the same.

• A control group is required because it is the variable you are testing.

• A control group is required to follow all the steps of the scientific method.

• A control group is required to compare what you are testing to what normally occurs.

How are activities 1, 2, and 3 the same?

• They all require making observations.

• They all involve the force of magnetism. 

• They all follow the exact steps of the scientific method.

• They all have questions answered using control groups.

Tags

NGSS.MS-PS2-2

Ellie conducts an investigation to determine if size or weight affect how fast objects fall. Her experiment includes repeatedly dropping a basketball and a golf ball at the same time. After many trials, she determines that both balls land at the exact same time. Why would Ellie’s experiment be valid?

• It includes her opinion.

• It is based on evidence.

• It uses objects that move.

• It proves her predictions are correct.

Tags

NGSS.MS-PS2-2

Joe is performing an investigation using several earthworms. He places a rectangular box under a bright lamp and covers one-half of the box so that it is shaded. He then puts the earthworms into the box on the side that is still brightly lit. Later, Joe notices that all of the earthworms have crawled over to the shaded side of the box. Based on his investigation, which of the following is an observation and NOT a personal opinion?

• Earthworms are afraid of light.

• Earthworms like staying together.

• Earthworms move away from light.

• Earthworms like living in the ground.

Tags

NGSS.MS-LS2-4

Arjun placed a salt cube in a cup of water. He wonders whether stirring the water will make the salt cube dissolve faster or slower. If Arjun stirs his cup of water, what effect does it have on the rate at which the salt cube dissolves?

• The rate that the salt cube dissolves will speed up.

• The rate that the salt cube dissolves will slow down.

• The rate that the salt cube dissolves will remain the same.

• The rate that the salt cube dissolves will slow down and then stop.

Susan blew up a balloon until it was completely full and as big as a soccer ball. Which of the following correctly describes the air inside the balloon?

• The air is a gas that cannot be contained by any means.

• The air is a gas that always forms a round shape when compressed.

• The air is a gas that expands to evenly fill the space inside the balloon.

• The air is a gas that will flow evenly and steadily from inside the balloon if punctured.

George's science teacher has a mixture of table salt and iron filings. Which of the following would be the best way to separate the salt and the iron filings?

• Use a magnet to pull the iron filings from the salt.

• Add food coloring to the mixture to make the salt change color.

• Pour them into a beaker of water and see if the iron filings float

• Heat up the mixture to see if the salt or the iron filings will burn away.

A ________________ is something that you change in an experiment. A factor that can be changed or controlled in order to test a hypothesis in a scientific experiment.

• variable

• prediction

• inference

• experiments