Content Benchmark P.8.A.3
Students know methods for separating mixtures based on the properties of the
components. E/S
1st Item Specification: Understand the terms solvent, solute, and solution.
Depth Of Knowledge Level 1
1. When salt dissolves in water, the water is the
A. solute.
B. solvent.
C. solubility.
D. solution.
2. If the solute particles in a solution are large enough to be seen and to be filtered,
the mixture is a (an)
A. colloid.
B. true solution.
C. electrolyte.
D. suspension.
3. In a mixture of salt dissolved in water, the solute is
A. the salt.
B. the water.
C. separated by filtering.
D. the precipitate.
Depth Of Knowledge Level 2
4. All of the following processes will increase the rate of dissolving a solid in a
liquid EXCEPT for
A. powdering the solid.
B. cooling the solution.
C. heating the solution
D. stirring the solution
5. Which of the following describes the carbon dioxide component of a carbonated
beverage?
A. Solvent
B. Precipitate
C. Solution
D. Solute
2nd Item Specification: Identify properties of matter including: magnetism, density,
conductivity, solubility.
Depth Of Knowledge Level 1
6. A solution that conducts an electric current is called a(an)
A. non-electrolyte.
B. saturated.
C. electrolyte.
D. unsaturated.
7. Which of the following would conduct electricity?
A. Wood
B. Salt water
C. Distilled water
D. Sulfur
8. The density of an object is the ratio of
A. mass to inertia.
B. mass to volume
C. volume to inertia.
D. volume to mass.
9. A force of attraction or repulsion due to the arrangement of electrons in atoms
results in a physical characteristic defined as
A. solubility.
B. conductivity.
C. magnetism.
D. density.
Depth Of Knowledge Level 2
10. Use the drawing below to answer the next question.
(From: http://nationsreportcard.gov/science_2005/s0116.asp)
A student put some sand, clay, and water into a bottle and shook the bottle. Then
she put the bottle down. After two hours, the bottle looked like the drawing
above. What can the student conclude based on what she sees in the bottle?
A. The water layer is denser than the layers of clay and sand.
B. The layer of clay is denser than the layers of sand and the water.
C. The layer of sand is denser than the water layer and the layer of clay.
D. The water layer, layer of clay, and layer of sand are all the same density.
11. The tables below list four liquids with four different densities. Use this table to
answer the question below.
Liquid
Density
1
1.0 g/mL
2
0.8 g/mL
3
0.6 g/mL
4
1.2 g/mL
If the liquids were carefully placed in a container, in what order would the liquids
form layers from TOP to BOTTOM?
A. 3, 2, 1, 4
B. 4, 1, 2, 3
C. 1, 2, 3, 4
D. 4, 3, 2, 1
3rd Item Specification: Identify properties of matter that can be used to separate
mixtures (e.g., filtering, chromatography, settling, chemical reaction, and
evaporation).
Depth Of Knowledge Level 1
12. Which of the following is NOT a mixture?
A. Air
B. Blood
C. Orange juice
D. Salt
13. Water would be helpful in separating a mixture of
A. sand and salt.
B. iron and sulfur.
C. iron and sand.
D. sand and sulfur.
14. Use the drawing below to answer the next question.
(From: http://nationsreportcard.gov/science_2005/s0116.asp)
Filtration using the equipment shown above can be used to separate which
materials?
A. A mixture of mud and water
B. A solution of salt and water
C. A mixture of alcohol and water
D. A mixture of sand and sawdust
15. Which of the following would be helpful in separating a mixture of iron and
sulfur?
A. A magnet
B. A Bunsen burner
C. Filter paper and a funnel
D. Water
Depth of Knowledge Level 2
16. What happens when salt water is boiled?
A. The salt becomes a new compound and evaporates with the water.
B. The water evaporates and the salt remains in the beaker.
C. Both the salt and the water evaporate and leave the beaker.
D. The salt will evaporate from the water and disperse into the environment.
17. A student is asked to design a method to separate a mixture of sand, table salt, and
water. Identify the appropriate procedure to be used.
A. filtration then distillation
B. distillation only
C. distillation the filtration
D. filtration only
Constructed Responses P.8.A.3
1. Kitchens can be disinfected by using many household substances such as distilled
water, salt water, and vinegar water. Maria has one glass of water, one glass of salt
water, and one glass of vinegar water which all look exactly alike.
A. Describe a procedure that Maria could do, without tasting any of the glasses, to find
out which glass contains the vinegar water. Justify your procedure by describing the
characteristic of this solution that is different from the others.
B. Describe a procedure Maria could do, without tasting any of the glasses, to find out
which glass contains the salt water. Include the method and the expected results.
Justify your procedure by describing the characteristic of the salt water that is
different from the water.
2. The drawing below shows a large cylinder. Use the drawing to answer the following
question.
(From: http://www.doe.mass.edu/mcas/images/db/04s08q37.gif)
At a science museum, a demonstration is performed using this cylinder, a small rubber
ball, and three liquids. These liquids are pancake syrup, vegetable oil, and water. Pancake
syrup with a density of 1.8 g/mL, vegetable oil with a density of 0.8 g/mL, and water
with a density of 1.0 g/mL are poured into the cylinder.
A. Draw the cylinder as shown. Draw and label the arrangement of these three liquids
within the cylinder. Justify the reasons for your arrangement of the liquids.
B. The small rubber ball, with a density of 0.9 g/mL, is dropped into the cylinder you
have drawn. Describe and draw where the ball will stop, and justify your answer.
Content Benchmark P.8.A.3
Students know methods for separating mixtures based on the properties of the
components. E/S
Answers to Sample Test Questions
1. B, DOK level 1
2. D, DOK level 1
3. A, DOK level 1
4. B, DOK level 2
5. D, DOK level 2
6. C, DOK level 1
7. B, DOK level 1
8. B, DOK level 1
9. C, DOK level 1
10. C, DOK level 2
11. A, DOK level2
12. D, DOK level 1
13. A, DOK level 1
14. A, DOK level 1
15. A, DOK level 1
16. B, DOK level 2
17. C, DOK level 2
Constructed Response 3-point Answers and Score Rubrics:
Constructed Response #1
Response addresses all parts of the question clearly and correctly.
Student response indicates an understanding of how to distinguish
vinegar water by the characteristic of smell. Student response
3 points
indicates an understanding of how to distinguish water from salt water
by describing both a correct method of determining the difference and
a result.
2 points
Response addresses all parts of the question and includes only minor
errors.
1 point
Response does not address all parts of the question.
0 points
Response is totally incorrect or no response provided.
Constructed Response #2
Response addresses all parts of the question clearly and correctly.
Response demonstrates the student's thorough understanding of the
concept of density and the response includes the following major
points. In the drawing, students should show that the liquids will
arrange themselves based on their densities with the pancake syrup
3 points
(most dense) on the bottom, then water, then vegetable oil on top. The
drawing should show the rubber ball and the student should explain
that the rubber ball will drop until it reaches the water. The density of
water is 1.00 g/mL and the density of the rubber ball is 0.9 g/mL.
Because the density of the rubber ball is less than the density of water,
it will float on top of the water, but will sink beneath the vegetable oil.
2 points
Response addresses all parts of the question and includes only minor
errors.
1 point
Response does not address all parts of the question.
0 points
Response is totally incorrect or no response provided.
(From:
http://www.doe.mass.edu/mcas/student/2004/question.asp?GradeID=8&SubjectCode=sci
&QuestionTypeName=&QuestionID=2457)