When Greta adds sugar to a cup of warm water, the sugar dissolves. She wonders whether the sugar is still there since she cannot see it anymore. She thinks the sugar must still be there because the water tastes sweet.

Sam is not sure if the sugar is still there. The sugar taste is still there, but he believes the sugar may be gone since he cannot see it.

They talk about how they can decide whether the sugar is still there.

Part A – Which tests do you think will help them determine whether the sugar is still there? Select all that apply.

A glass of saltwater is sitting on a table. Which of the following best describes the matter in this saltwater?

A teacher wants to make a model to show her students that gas is a type of matter.

Which of the following would best show this to the students?

Pria found a container of an unknown substance in her refrigerator. She created the following table of her observations and measurements of this substance.

Which of the following questions was Pria likely asking in this investigation of an unknown substance? Choose the best response based only on the data in the table above.

A cook has containers with several white powders in them. She cannot tell the powders apart by looking at them. Which of the following would help her determine the properties of each powder?

Mary fills four small containers to the top with different substances. She weighs them and makes a table to compare the results. The substances are small rocks, paper, feathers, and a small pencil.

Which substance could be the small rocks?

Maxine poured two different substances together in a glass beaker. Below are her observations both before and after she mixed these substances:

Maxine makes a claim that a new substance formed as a result of mixing these two substances. What evidence from the data best supports this argument?

A hot-air balloon pilot controls the balloon by adding or releasing hot air as the balloon flies high in the sky.

Which of the following best describes why hot air is used to make the balloon rise?

LaToya is making hot chocolate. She pours the hot chocolate powder into a glass of milk, mixes it, and then heats it up in the microwave. LaToya claims that since she can no longer see the powder after it has been mixed, it must no longer be there.

Which of the following would not support LaToya’s claim, and instead, show that the powder is still in the mixture?

Yong pours 1 cup of liquid water into an ice tray and then puts it in the freezer to make ice.

Which of the following statements about the liquid water and the ice is accurate?

Carlos tests four rocks. All of the rocks are gray. He wonders whether they are made of the same material.

He does the following tests on each of the rocks to find out whether the rocks are made of the same or different materials.

He examines the surface with a magnifying glass. He drags the rock across a piece of glass. If the rock is harder than glass, the rock will scratch the glass. If the rock is not harder than glass, nothing will happen to the glass. He puts a drop of vinegar on the rock. For some materials, the vinegar will cause bubbles to form. For other materials, nothing will happen.

The data from his tests are in the table.

Carlos believes that Rocks 1 and 4 are made of the same material. What data supports his conclusion? Select all that apply.

Deshawn has a glass of water. After he adds a few drops of black dye to it, he can see black swirls in the water. After a while, all of the water is grey.

If you could zoom in to see what the water and dye are made of, which set of models best shows how the water turned grey?

Julie and Michael have two white materials made up of crystals. They need to figure out whether they are the same or different.

What observations would be useful for determining whether they are the same material? Choose all that apply.