Mixing Materials: What Dissolves in Water?

Mia stirs a spoonful of sugar into a cup of water. After a little while, she cannot see the sugar anymore. Did the sugar dissolve? Explain your answer.

Liam adds sand to a cup of water and stirs. The sand sinks to the bottom. Did the sand dissolve? Explain your answer.

Circle the materials that usually dissolve in water: salt, pepper, sugar, small rocks.

A student mixes salt into water and tastes one tiny drop with permission from the teacher. The water tastes salty. What does this show about the salt?

Look at this observation: Cocoa powder made the water brown, but some powder floated on top and some sank. Did all of the cocoa powder dissolve? Explain.

Nora wants to test whether baking soda dissolves in water. What should she do after adding baking soda to the cup?

Two cups have the same amount of water. Cup A has warm water, and Cup B has cold water. Sugar is added to both cups. In which cup might the sugar dissolve faster?

A student says, "The salt disappeared, so it is gone forever." Is the student correct? Explain.

Which observation is stronger evidence that a material dissolved: it changed the water color evenly, or it stayed in clumps at the bottom? Explain.

Jada tests three materials in water. Salt disappears, rice sinks, and sugar disappears. Which materials dissolved?

Draw or describe what you might see after stirring gravel in water. Would the gravel dissolve?

Why is it important to use the same amount of water when comparing how different materials dissolve?

A student mixes blue drink powder into water. After stirring, the whole cup of water is blue with no powder at the bottom. What can the student conclude?

Choose the best science word to complete the sentence: When a solid mixes evenly into water and seems to disappear, it ____. Word choices: freezes, dissolves, floats.

Plan a simple test to find out whether flour dissolves in water. Name one thing you would do and one thing you would observe.