Name _____________________________ Date _______________ Period_____________ ISN Page _______
Unit 2 Assessment Review
**I will be able to explain that matter has properties that are determined by the structure and arrangement
of its atoms.
1. Classify each of the following statements below into the appropriate category:
- Has the most amount of energy
- Particles are far apart and move
- Attraction between particles is very strong
randomly
- Has the least amount of energy
- Have no definite shape, but take on the
- Has more energy than solids and less
shape of their container.
energy than gases
- Particles are close together and vibrate in
- Particles are close together and move
place.
randomly
- Attraction between particles is moderate
- Have a definite shape and volume
- Have no definite shape or volume (can be
- Attraction between particles is very weak
compressed)
Gas
Liquid
Solid
2. On the right, you’ll see the particle arrangement of a
substance. On the line below the picture, identify it as
a solid, liquid, or gas. If I add heat to the substance,
what will happen? Draw the particle arrangement in
the empty box.
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3. Dry ice is used in fire extinguishers. The dry ice is stored in the cylinder in a solid form. When sprayed on a fire,
it quickly changes into the gas known as carbon dioxide (CO2). What is this change in state called?
__________________________
4. The diagram shows a change of state in water. What phase
change does the X represent? _______________________
5. When the temperature of a liquid is increased a little, what happens to its particles?
A. The particles start vibrating more
B. The particles move so close together that the liquid becomes a gas
C. The particles stop vibrating
D. The particles lose mass
Explain your reasoning:
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**I will be able to apply an equation to determine the density of an object based on its mass
and volume.
For each of the below questions, make sure you show your work and put units on your final
answer.
6. The volume of a solution was measured in a graduated cylinder (shown to the right). If the mass of
the solution is measured to be 90 grams, what is the density of the solution?
7. The density of aluminum is 2.7 g/mL. If the mass of a piece of aluminum is 244 grams, what is the volume of the
aluminum?
8. Why does ice float on top of liquid water?
A. Ice has a lower density than water
B. Ice has a higher density than water
C. Ice is a solid
D. Ice is colder than water
Explain your reasoning for your answer choice.
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#9- Multiple Answers could be correct. Choose the correct answer(s) and justify your reasoning.
9. Why is density considered a useful property for identifying
matter?
A. Different substances have the same densities
B. Density is a property that is unique to each substance
C. Density predicts whether objects will change state
D. Density varies at different temperature
E. Density can determine how pure a substance is
F. Density identifies the weight of a substance
Explain your reasoning for your answer choice.
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Explain your reasoning for your answer choice.
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________Be sure to color and label each of the
11. Below are densities of various liquids. Layer the liquids in the column.
10. Why doesn’t an ice cube float in air?
A. Water is less dense than air
B. Air is more dense than ice
C. An ice cube is more dense than air
D. Air has more pressure
substances.
Substance
Sea water
Glycerin
Cooking oil
Water
Ethanol
Sulfuric acid
Gasoline
Density (g/cm3)
1.02
1.26
0.92
1.00
0.79
1.83
0.66
**I will be able to interpret the results of an investigation to determine whether a physical or chemical
change has occurred.
12. Ms. Schooley was conducting an experiment to determine what type of environment produces rust. She
decided to set up three different environments and place an iron nail in each environment. She closely monitored
the experiment and wrote down the time that rust began to appear on the nail. Below are her results:
Salt water
Bottled water
Tap water
Filtered water
Rusts in 36 hours
Rusts in 76 hours
Rusts in 74 hours
Rusts in 85 hours
A. Is rusting a physical or chemical change? Why or why not?
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B. Identify the independent variable
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C. Identify the dependent variable
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D. Identify 3 variables that should be controlled in this experiment
a. _________________ b. _____________________ c. ___________________
13. The evil scientist, Ms. Asbill, challenges her students by telling them that they must blow up a balloon using
only science! Ms. Asbill cackles into the sky and tells her students that there is only one rule for this challenge:
students are not allowed to blow up the balloon themselves. Students are given a random list of supplies to use to
design their experiment. Sam, Kendall, and Jarod decide to combine yeast, sugar, and water into an Erlenmeyer
flask. They quickly secure the balloon on top of the flask and sure enough- the balloon inflates!!
Is the result classified as a physical or chemical change? Explain.
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14. Mrs. Stamper has gone berserk! When Ameilia, Elijah, and Caitlan arrive to class, they see the frenzied, crazyeyed Mrs. Stamper smash her reading glasses while running to her stack of ungraded papers. She grabs the
ungraded papers and shreds them with her mighty fists! Then, she jumps on a chair and breaks the back of the
chair off! She even crushed an empty can of coke on her forehead! Ameilia, Elijah, and Caitlan run to their teacher
and exclaim, “Mrs. Stamper! Mrs. Stamper! What’s gotten into you? Are you okay?” Mrs. Stamper giggles and
growls, “I need chocolate!” Alex suddenly appears in the classroom and throws Milky Ways and Twix at Mrs.
Stamper. She consumes the candy immediately, but it’s not enough! The ravenous Mrs. Stamper is now
demanding brownies from the CDC. The concerned students run to the CDC and ask at Mrs. Youngquist to make
more brownies to appease Mrs. Stamper! Luckily, a fresh batch is out of the oven. The students take the brownies
back to Mrs. Stamper. After eating a brownie, Mrs. Stamper returns to her normal self.
Identify the physical and chemical changes in the story above. (Hint: At least 3 physical changes and 2 chemical
changes)
Physical Changes
Chemical Changes