Chapter 9 - Atoms_ Elements_ _ the Periodic Table

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					Chapter 9 - Atoms, Elements, & the Periodic Table

Modified True/False
Indicate whether the sentence or statement is true or false. If false, change the identified word or phrase to make the
sentence or statement true.

____    1. When a substance burns, matter is destroyed. _________________________
____    2. Elements on the far right of the periodic table are classified as nonmetals. _________________________
____    3. Substances are either elements or mixtures. _________________________
____    4. The closer an electron is to the nucleus, the lower its energy. _________________________
____    5. Matter always has mass. _________________________


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

____    6. Matter that has the same composition and properties throughout is called a(n) ____.
           a. substance                                    c. atom
           b. mixture                                      d. isotope
____    7. When two pure substances are combined so that each of the pure substances retains its own properties, the
           result is a(n) ____.
           a. compound                                     c. element
           b. mixture                                      d. isotope
____    8. How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca3(PO4)2?
           a. one                                          c. three
           b. two                                          d. four
____    9. When Rutherford performed his metal foil experiment, he was surprised that most of the alpha particles ____.
           a. were deflected by the foil                   c. were absorbed by the foil
           b. bounced back from the foil                   d. passed straight through the foil
____   10. Which of these statements about matter is NOT true?
           a. During chemical changes, matter is destroyed.
           b. Matter has mass and takes up space.
           c. Matter can be divided into pure substances and mixtures.
           d. Matter is made up of atoms.
____   11. The millions of compounds that exist are made from approximately ____ elements.
           a. 50                                           c. 115
           b. 75                                           d. 150
____   12. Most of the mass of an atom is found in its ____.
           a. nucleus                                      c. atomic number
           b. electron cloud                               d. mass number
____   13. Which of the following CANNOT be classified as matter?
           a. an odorless, colorless gas                   c. alpha particles
           b. the heat given off by a light bulb           d. an electron cloud
____   14. ____ has mass and takes up space.
           a. Thought                                      c. Air
           b. Light                                        d. Emotion
Matching

             Match each symbol or formula with the correct element or compound.
             a. O2                                         c. CO
             b. CO2                                        d. C
____   15.   carbon
____   16.   oxygen
____   17.   carbon monoxide
____   18.   carbon dioxide


Short Answer

       19. Use the periodic table to complete the data in Table 9-1.

                                          Properties of Selected Elements
                   Symbol                  Name               Atomic number       Average Atomic
                                                                                      Mass
                                          Fluorine
                      O
                                                                       15
                      S                                                               32.066
                                                     Table 9-1

				
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