1. Matter & Energy Chapter 2 Review
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2. Which of the following is NOT an example of a physical property?
Shape
Color
Mass
Rust

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5. The measure of the amount of matter an object contains within a given volume is called?
Density
Mass
Volume
Area

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8. Which item has a lower density?
A box of feathers
A box of pennies

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A box of feathers has a lower density than a box of pennies because the volume of feathers has a lower mass than an equal volume of pennies.
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11. Which of the following examples is a clear sign that a chemical change has occurred?
Change in size
Production of
an odor
It disappears
The weight
has changed

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Chemical changes may produce new smells. For example, rotting eggs produce the smell of sulfur.
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14. True or False: Changes of state are physical changes.

15. A liquid can change into a gas, and a gas can turn into a liquid.
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A solid can change into a liquid substance, and a liquid can turn into a solid substance.
A liquid can change into a gas, and a gas can turn into a liquid.
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17. The point at which a solid's particles vibrate fast enough to break away from each other and turn into a liquid is called?
Melting point
Freezing point
Evaporation
Sublimation

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The melting point of some solids is well-defined, such as those for ice and steel. These substances have orderly structures, so melting will start at a specific temperature. Other substances, such as chocolate and plastic, melt gradually over a wide range of temperatures.
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20. True or False: The melting point and freezing point of a substance is the same.

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Above the melting/freezing point, the substance is a liquid; below the melting/freezing point, the substance is a solid. At the melting/freezing point, the substance can be either solid or liquid.
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23. What is the process by which a liquid becomes a gas?
Condensation
Melting
Evaporation
Sublimation

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Particles in liquids move at different speeds. The fastest moving particles can escape from the surface of a liquid. Since warmer liquids have faster moving particles, evaporation occurs more quickly when a substance is warmer. For example, water evaporates more quickly on a warm day than a cool day.
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26. What is the process by which a solid turns directly into a gas?
Condensation
Melting
Evaporation
Sublimation

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Dry ice, which is frozen carbon dioxide, turns directly into carbon dioxide gas under normal conditions.
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29. What is the measure of how well a solid dissolves in a liquid?
Melting point
Density
Solubility
Chemical
Change

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For example, a spoonful of sugar dissolves in water very easily if you pour it in and stir it with the spoon. Much of a spoonful of dirt will settle to the bottom of a glass of water when you stop stirring.
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32. 11. 0 g of pure gold has a volume of 2. 00 cm³
11.0 g of pure gold has a volume of 2.00 cm³. What is the density of gold?
5.0 g/cm³
4.8 g/cm³
5.7 g/cm³
5.5 g/cm³

33. Density=Mass/Volume. 11.0 g divided by 2.00 cm³ is 5.5 g/cm³.
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Density=Mass/Volume g divided by 2.00 cm³ is 5.5 g/cm³.
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35. Which of these is a chemical change, not a physical change?
Breaking a ball of
clay into 2 pieces
An ice cube
melting
Baking a cake
Water boiling

36. Changing from one state to another is a physical change.
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Changing from one state to another is a physical change.
Burning, cooking, baking, and rusting are examples of chemical changes.
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38. An example of evaporation is when:
Ice cream in a freezer
slowly forms ice
crystals
Just-washed hands
are rubbed on a
towel
Grass wet with dew
slowly dries in the
morning sunshine
Eggs are hard-boiled

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41. The melting point of aluminum is 660°
The melting point of aluminum is 660°. Is aluminum a solid or a liquid at room temperature (23°)?
Solid
Liquid

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If aluminum’s melting point is 660°, then it will remain a solid until it reaches that temperature.
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44. A physical change in a substance:
Creates a different
substance but not
different physical properties
Creates a different
substance with
different physical properties
Does not change either
the substance or its
physical properties
Changes a physical
property but not the
substance itself

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47. As a solid heats up, its particles gain energy and vibrate
As a solid heats up, its particles gain energy and vibrate. When they vibrate enough, the particles move away from one another. That describes:
Condensation
Melting
Freezing
Boiling

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50. Congratulations! You know your matter and energy facts!