Maximum Score:  8 Points

Question 1- Procedure for Identifying Liquids	3 points total
Point Criteria:

• Allow 3 points for a valid, logical procedure that includes the finding and comparing the masses of the two liquids. (The mass, volume, and density of the bottle is irrelevant to the student's responses for this activity.)
• Acceptable responses include:
  • Mass Method
    • Find the mass of the yellow liquid (1 point)
    • Find the mass of the blue liquid (1 point)
    • Compare to find which would have the greater density (1 point)
      or
    • Mass the yellow and the blue (2 points)
    • The heavier will be more dense (1 point)
  • Density Method
    • Find the mass of both liquids (1 point)
    • Assign a volume to both liquids (1 point)
    • Compare densities (1 point)

Question 2- Results of Experiment	2 points total
Point Criteria:

• Allow 1 point for correct blue liquid data based upon the student's plan.
• Allow 1 point for correct yellow liquid data based upon the student's plan.
  • Mass Method
    • Qualitative mass comparison using a double pan balance is acceptable.
    • Quantitative mass must be within +/- 1.0 grams
  • Density Method
    • Density must be within +/-0.5 g/ml

Question 3- Identification of Liquids	1 points total
Point Criteria:

• Allow 1 point for correctly identifying both liquids
  • Blue liquid = X
  • Yellow liquid = Z
  (Accept any student response based on his/her data)

Question 5- Density/Mass Relationship	2 points total
Point Criteria:

• Allow 2 points for a generalized statement abut the density/mass relationship.
  • If two substances (solutions) have equal volumes, the one with the greater mass will have the greater density.
  • The mass of the yellow was greater than the blue. Since the volumes were the same, the yellow is more dense.
• Allow 1 point if the student does not address a constant volume.
  • The liquid with the greater mass has a greater density.

Highest possible score - 8 point

Circle the student's score for each question. Add the points for each question and write the total score at the bottom of the scoring form.

	Total Score ____________________
	Total possible score - 8 points

Circle the student's score for each question. Add the points for each question and write the total score at the bottom of the scoring form.

	Total Score ____________________
	Total possible score - 8 points