To Dissolve or Not to Dissolve?
To dissolve or not to dissolve introduces Grade 5 students to solubility — the property that determines whether a substance mixes completely into a liquid or remains visible. Sugar is soluble in water: it breaks into invisible particles and seems to disappear. Sand is insoluble: it stays visible and doesn't mix. Understanding this distinction from Amplify Science (California) Grade 5, Chapter 2, helps students classify materials and begins to explain why some salad dressings appear clear while others have visible sediment settling at the bottom.
Key Concepts
When you stir a solid into a liquid, two things can happen. It might seem to disappear, or it might stay visible.
If a solid breaks down and mixes completely into the liquid, we say it is soluble . Sugar is soluble in water. If the solid stays visible and doesn't mix, it is insoluble . Sand is insoluble in water. This property of solubility helps us classify different materials.
Common Questions
What does 'soluble' mean?
A substance is soluble if it breaks apart and mixes completely into a liquid, appearing to disappear. Sugar in water is an example — the sugar dissolves and cannot be seen.
What does 'insoluble' mean?
An insoluble substance does not dissolve in a liquid. It remains visible and separate. Sand in water is insoluble — the sand particles stay visible and settle at the bottom.
What is solubility?
Solubility is the property of a substance that describes its ability to dissolve in a given liquid. It is a physical property used to classify and separate materials.
How can you tell if something is soluble or insoluble?
Add it to the liquid and stir. If it disappears completely and the liquid remains clear (or uniformly colored), it is soluble. If particles remain visible, it is insoluble.
Does solubility depend on the liquid?
Yes. A substance may be soluble in one liquid but insoluble in another. For example, some substances dissolve in oil but not in water. Solubility is always specific to a particular liquid.
What grade and chapter covers solubility?
Grade 5, Chapter 2 of Amplify Science (California): Why do some salad dressings have sediments, and others do not?