chemistry

Experiment 3 Rainbow

Name: ______________________________________________

Questions – circle the best answer.

1. Which of the following is an expression of concentration?

a) 15 g b) 45 mL c) 0.33 g/mL d) 3.0 mL/g

2. Which of the following correctly describes a formula for concentration?

a) (g solute) x (mL solvent) b) (g solute) / (mL solvent) c) (mL solvent) /(g solute)

3. Which of your solutions is the most dense?

a) Red b) Yellow c) Blue d) Green

4. Which of your solutions is the least dense?

b) Red b) Yellow c) Blue d) Green

5. Calculate the concentration of the green solution in grams/milliliters (g/mL). Use 1 Tbs sugar = 15 g sugar and 1 Tbs water = 15 mL.

6. Once you have layered the solutions, stir them vigorously. Wait several minutes. The solution them reforms the layers of various colors.

a) True b) False

7. If you combined oil and water in the same vessel, they separate and form layers.

a) True b) False

8. If you combined oil and water in the same vessel, stirred them vigorously and waited several minutes, they will not separate into layers.

a) True b) False

9. Summarize and explain what you observed when you stirred your sugar solutions.

10. Explain what you observe when you stir the oil and water. Which liquid is the most dense?