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Modeling Matter CJ Practice
Test Description: A review of modeling matter
Instructions: Answer all questions to get your test result.
1) Which of the following is a pure substance (not a mixture)?
A
water
B
cereal and milk
C
jello
D
soda
2) A solid chocolate bar is heated so it melts. How will the speed of its particles change?
A
Its particles will move slower than before.
B
All of these answers are correct.
C
Its particles will move at the same speed as before.
D
Its particles will move faster than before.
3) Why did the color dyes separate from the food coloring mixture?
A
The water molecules were attracted to the dye molecules and separated them as the water rose up the paper.
B
The food coloring did not separate.
C
The water molecules changed the dye molecules from a pure substance into a mixture.
D
The water molecules caused the dye molecules to change color.
4) What caused the four objects to separate in the FAN chromatography experiment?
A
none of these
B
wind (moving air)
C
water (rose up the paper)
D
water and wind
5) What ingredient is Good Food Production worried is in their food coloring?
A
red dye # 75
B
blue dye # 15
C
yellow dye # 44
D
orange dye # 3
6) Which of the following explains what happened to the food coloring during the chromatography experiment?
A
The water made the food coloring change colors from black to red, orange, green, and blue.
B
The water changed the ink from a substance into a mixture.
C
The water made the food coloring molecules stretch and get bigger.
D
The water made the different color dye molecules move different lengths up the paper so they spread out.
7) A student has a glass of milk and a glass of orange juice. Are these two liquids made from the same molecules?
A
No, milk is made of atoms and orange juice is made of molecules.
B
No, they have different properties.
C
Yes, since they are both liquid.
D
Yes, since they both are mixtures.
8) When two or more atoms are joined together, it is called a:
A
atom
B
none of these
C
molecule
D
comboatom
9) You have a bag of sugar and a box of salt. Are these two substances made from the same molecules?
A
No, they have different properties so they must be made of different molecules.
B
Yes, since they are both white.
C
Yes, since they are both solids.
D
No, sugar is made of atoms and salt is made of molecules.
10) Four students are talking about the chromatography experiment in science class. Which student is correct?
A
Student A says that the water made it change from colors from black to orange, pink, and blue.
B
Student C says that the water made some of the dye color molecules move farther up the paper than other dye colors.
C
Student B says that the water made the food coloring molecules strech out and get bigger.
D
Student D says that the water changed the food coloring from a substance into a mixture.
*select an answer for all questions
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