Properties of Matter
Part 2: Mixtures and Solutions
Mass, Volume, and Dissolving
Students determine how dissolving affects the mass and volume of substances and solutions.
INQB Propose a hypothesis and give a reason for the hypothesis…
INQD Plan and conduct a scientific investigation that is appropriate for the question being asked…
PS2F Apply the concept of conservation of mass to correctly predict changes in mass…
- When the masses of the two parts of a solution are added together, the total will equal the mass of the solution. But when the volume of the two parts of a solution are added together, the total may be less than the volume of the solution.
- The mass of a substance does not change when a substance dissolves.
- Inquiry 14.1: It is a good idea to try this out ahead of time to make sure the procedure and materials you will use end up with a measurable decrease in volume when the liquids are combined. To save money, this lab can successfully be conducted using 25 mL of each liquid instead of 50 mL.
- Note for Lesson 15 - **Make sure the copper sulfate solutions from Lesson 12 are going to be ready to use in Lesson 15. You can always supplement student samples with a little extra copper sulfate solution of your own to make sure they all have crystals to use in Lesson 15.
- Inquiry 14.1: This requires very precise measurements. Following the Getting Started activity is recommended so students take the time to practice measuring volume using a pipette.
- Inquiry 14.1 / 14.2: Student pairs should report their data to the class as a way to collect multiple trials. Students will discover that results may vary because they are measuring with such precision.