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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
cereal and milk
B
jello
C
water
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 at the same speed as before.
B
Its particles will move faster than before.
C
Its particles will move slower than before.
D
All of these answers are correct.
3) Why did the color dyes separate from the food coloring mixture?
A
The water molecules caused the dye molecules to change color.
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 were attracted to the dye molecules and separated them as the water rose up the paper.
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 molecules stretch and get bigger.
B
The water made the different color dye molecules move different lengths up the paper so they spread out.
C
The water changed the ink from a substance into a mixture.
D
The water made the food coloring change colors from black to red, orange, green, and blue.
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, they have different properties.
B
Yes, since they both are mixtures.
C
No, milk is made of atoms and orange juice is made of molecules.
D
Yes, since they are both liquid.
8) When two or more atoms are joined together, it is called a:
A
none of these
B
molecule
C
atom
D
comboatom
9) You have a bag of sugar and a box of salt. Are these two substances made from the same molecules?
A
Yes, since they are both solids.
B
No, they have different properties so they must be made of different molecules.
C
Yes, since they are both white.
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 C says that the water made some of the dye color molecules move farther up the paper than other dye colors.
B
Student D says that the water changed the food coloring from a substance into a mixture.
C
Student B says that the water made the food coloring molecules strech out and get bigger.
D
Student A says that the water made it change from colors from black to orange, pink, and blue.
*select an answer for all questions
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