Problem Description:
The image shows a worksheet titled "Soluble Materials." The task involves identifying which materials are soluble in water and which are not. The materials listed are:
-
Rice
-
Salt
-
Sand
The student is asked to categorize these materials into two jars labeled:
1.
MY LUCKY JAR (for materials that dissolve in water)
2.
Snowflake Materials (for materials that do not dissolve in water)
Additionally, there are notes provided on the right side of the page:
- There are many materials around us that are soluble in water.
- Some materials can dissolve in water.
- Some materials cannot dissolve in water.
Solution Explanation:
#### Step 1: Understand Solubility
-
Solubility refers to the ability of a substance to dissolve in a solvent (in this case, water). When a material dissolves in water, it forms a homogeneous mixture where the particles of the material are evenly distributed throughout the water.
#### Step 2: Analyze Each Material
We will evaluate each material based on whether it dissolves in water:
1.
Rice:
- Rice does not dissolve in water. When rice is added to water, it absorbs water and swells, but it does not break down into smaller particles that mix uniformly with the water.
-
Conclusion: Rice is
not soluble in water.
2.
Salt:
- Salt (sodium chloride, NaCl) dissolves completely in water. When salt is added to water, it breaks down into sodium ions (Na⁺) and chloride ions (Cl⁻), which disperse evenly throughout the water, forming a clear solution.
-
Conclusion: Salt is
soluble in water.
3.
Sand:
- Sand is made up of small particles of minerals like quartz or other silicates. These particles do not dissolve in water; they remain as solid particles and settle at the bottom of the container.
-
Conclusion: Sand is
not soluble in water.
#### Step 3: Categorize the Materials
Based on the analysis:
-
Soluble in water (MY LUCKY JAR): Salt
-
Not soluble in water (Snowflake Materials): Rice, Sand
#### Final Answer:
-
MY LUCKY JAR: Salt
-
Snowflake Materials: Rice, Sand
Boxed Final Answer:
$$
\boxed{\text{MY LUCKY JAR: Salt; Snowflake Materials: Rice, Sand}}
$$
Parent Tip: Review the logic above to help your child master the concept of soluble or insoluble worksheet.
