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Physical & Chemical Changes Make-up Quiz

Multiple Choice

Identify the choice that best completes the statement or answers the question.

____ 1. The diagram below models a change that occurs in matter.

[pic]

Based on what you know about changes in matter, explain why the diagram shows a physical change rather than a chemical change.

|A. |The particles get smaller. |

|B. |The volume of the matter decreases. |

|C. |The composition of the matter stays the same. |

|D. |The particles change into particles of different substances. |

____ 2. Marco tears a piece of notebook paper into smaller pieces, as shown below.

[pic]

Tearing paper into pieces is an example of what kind of change?

|A. |a change in mass |

|B. |a physical change |

|C. |a chemical change |

|D. |a change in energy |

____ 3. There are several differences between chemical and physical changes. Which process is an example of a chemical change?

|A. |steam rising from a boiling pot of soup |

|B. |a metal railing rusting in damp weather |

|C. |alcohol evaporating from a cotton swab |

|D. |a piece of wood shrinking as it dries out |

____ 4. Trini adds 10 g of baking soda to 100 g of vinegar. The mixture begins to bubble. When the bubbling stops, Trini finds the mass of the resulting mixture. She determines its mass is 105 g. Why has the mass changed?

|A. |A gas has formed and left the mixture. |

|B. |Vinegar evaporated during the experiment. |

|C. |Mixtures always are less massive than their parts. |

|D. |Mass was destroyed when vinegar reacted with baking soda. |

____ 5. Which process is an example of a physical change?

|A. |burning |

|B. |rusting |

|C. |flattening |

|D. |decomposing |

____ 6. Which types of changes observe the law of conservation of mass?

|A. |only changes of state |

|B. |only physical changes |

|C. |only chemical changes |

|D. |physical changes and chemical changes |

____ 7. Chemical changes result in new substances, but physical changes do not. Which process is an example of a chemical change?

|A. |baking a cake |

|B. |chopping a tree |

|C. |heating a cup of tea |

|D. |drying clothes in the dryer |

____ 8. Which process is an example of a physical change?

|A. |Water turns to steam when boiled over a Bunsen burner. |

|B. |Carbon combines with oxygen to form carbon dioxide gas. |

|C. |Water breaks down into hydrogen and oxygen gases over time. |

|D. |Limestone breaks down into lime and carbon dioxide when heated. |

____ 9. Which observation is a sign of a chemical change?

|A. |A rotting potato gives off a bad smell. |

|B. |A melting block of ice leaves a large puddle. |

|C. |A cloud changes shape when blown by wind. |

|D. |A plaster statue breaks when it falls onto the floor. |

____ 10. In the laboratory, Austin is given a mixture of iron filings, sand, and salt. To separate the mixture, Austin uses a magnet, boiling water, and a filter. Which statement is true about the process Austin uses to separate this mixture?

|A. |Austin uses only physical changes to separate the mixture’s components. |

|B. |Austin uses only chemical changes to separate the mixture’s components. |

|C. |Austin uses both physical and chemical changes to separate the mixture’s components. |

|D. |Austin uses neither physical nor chemical changes to separate the mixture’s components. |

Short Answer

1. What are three signs that a chemical change has taken place?

2. How does temperature affect chemical changes?

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