Science - 2019-20
3.3 - Matter
The student will investigate and understand how materials interact with water. Key ideas include
a) solids and liquids mix with water in different ways; and
- plan and conduct an investigation to identify liquid materials that will mix with water. Bloom's Level: Apply
- classify liquids by their ability to mix with water. Bloom's Level: Analyze
- plan and conduct an investigation to determine solids that will dissolve in water. Bloom's Level: Apply
- classify solids based on their ability to dissolve in water. Bloom's Level: Analyze
- plan and conduct an investigation to determine the effect of temperature of water on the dissolving of a solid. Bloom's Level: Apply
Many substances interact in water; when substances dissolve in water a solution is formed. The dissolved substance is still present even though it cannot be seen.
UNDERSTANDING THE STANDARD
- Water dissolves more substances than any other liquid.
- Some liquids will mix with water, while others will not.
- Dissolving is when a substance is distributed evenly throughout another substance.
- The substance being dissolved breaks down into smaller pieces that cannot be seen.
- Some solids will dissolve in water while others will not.
- Substances dissolve faster in hot water than cold water because hot water has more energy than cold water.
- When water is heated, the molecules gain energy and, thus, move faster.
- As they move faster, they come into contact with the sugar more often, causing it to dissolve faster. Students do not need to know the terms solute, solvent, atoms, molecules or particles.
· What does dissolve mean?
· What solids dissolve in water?
· Which liquids mix with water?
How does heat affect dissolving?
In order to meet this standard, it is expected that students will
- describe and apply the term dissolve.
- predict and describe how various materials (vinegar, milk, baking soda, powdered drink mix, sugar, salt, sand, oil, soil, rocks) act when mixed with water.
- classify liquids and solids into those that will dissolve in water and those that will not. Use tables and/or charts to record and display the information.
- infer that some substances will dissolve more easily in hot water than in cold water by conducting investigations using water at different temperatures