Choose the best answer.
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1 | |
Element can be distinguished unambiguously by their ________________. |
| | A) | hardnesses |
| | B) | colors |
| | C) | atomic numbers |
| | D) | electrical properties |
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2 | |
At room temperature and atmospheric pressure, most elements are __________________. |
| | A) | gases |
| | B) | liquids |
| | C) | metallic solids |
| | D) | nonmetallic solids |
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3 | |
The nonmetal whose chemical behavior is most like that of typical metals is ___________________. |
| | A) | hydrogen |
| | B) | helium |
| | C) | chlorine |
| | D) | carbon |
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4 | |
Compared with metals, nonmetals in general are _______________. |
| | A) | better conductors of heat |
| | B) | better conductors of electricity |
| | C) | more active chemically |
| | D) | less easily deformed (by bending, for instance) |
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5 | |
The place of an element in the periodic table is determined by its ____________________. |
| | A) | atomic number |
| | B) | atomic mass |
| | C) | density |
| | D) | chemical activity |
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6 | |
Each vertical column of the periodic table is determined by its _____________________. |
| | A) | atomic number |
| | B) | atomic mass |
| | C) | density |
| | D) | chemical activity |
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7 | |
From left to right, each period of the periodic table terminates in a(n) ___________________. |
| | A) | inert gas |
| | B) | active metal |
| | C) | weakly active nonmetal |
| | D) | highly active nonmetal |
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8 | |
Across any period of the periodic table ________________. |
| | A) | metallic activity decreases to the right |
| | B) | metallic activity increases to the right |
| | C) | metallic activity remains constant to the right |
| | D) | nonmetallic activity decreases to the right |
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9 | |
An alkali metal atom _________________. |
| | A) | has one electron in its outer shell |
| | B) | has two electrons in its outer shell |
| | C) | has a filled outer shell |
| | D) | lacks one electron of having a felled outer shell |
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10 | |
A halogen atom _____________. |
| | A) | has one electron in its outer shell |
| | B) | has two electron in its outer shell |
| | C) | has a felled outer shell |
| | D) | lacks one electron of having a felled out shell |
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11 | |
An inert gas atom ________________. |
| | A) | has one electron in its outer shell |
| | B) | has two electrons in its outer shell |
| | C) | has a filled outer shell |
| | D) | lacks one electron of having a felled outer shell |
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12 | |
An atom that loses its out electron or electrons readily is _________________. |
| | A) | an active metal |
| | B) | an active nonmetal |
| | C) | an inactive metal |
| | D) | an inactive nonmetal |
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13 | |
When they combine chemically with metal atoms, nonmetal atoms tend to __________________. |
| | A) | gain electrons to become negative ions |
| | B) | lose electrons to become positive ions |
| | C) | remain electrically neutral |
| | D) | any of the above, depending upon the circumstances |
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14 | |
When atoms join to form a molecule, _______________. |
| | A) | energy is absorbed |
| | B) | energy is given off |
| | C) | energy is neither absorbed nor give off |
| | D) | any of the above, depending on the circumstances |
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15 | |
In a covalent molecule, ________________. |
| | A) | at least one metal atom is always present |
| | B) | one or more electrons are transferred from one atom to another |
| | C) | adjacent atoms share one or more electrons |
| | D) | adjacent atoms share one or more pairs of electrons |
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16 | |
Sodium chloride crystals consist of ___________________. |
| | A) | NaCl molecules |
| | B) | Na and Cl atoms |
| | C) | Na+ and Cl- ions |
| | D) | Na- and Cl+ ions |
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17 | |
A compound whose name ends in -ate always contains ___________________. |
| | A) | hydrogen |
| | B) | oxygen |
| | C) | hydrogen and oxygen |
| | D) | carbon |
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18 | |
The number of oxygen atoms in a molecules of aluminum sulfate, Al2(SO4)3, is _________________. |
| | A) | 3 |
| | B) | 4 |
| | C) | 7 |
| | D) | 12 |
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19 | |
The nitrate ion has the formula NO3-. The formula of mercury (II) nitrate is ______________. |
| | A) | HgNO3 |
| | B) | Hg2NO3 |
| | C) | Hg(NO3)2 |
| | D) | Hg2(NO3)2 |
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20 | |
Which of the following chemical equations is balanced? |
| | A) | Fe2O3 + CO → Fe + 2CO2 |
| | B) | Na2SO2 + S → S2O3 + S |
| | C) | 3CuO + 2NH3 → 3Cu + 3H2O +N2 |
| | D) | 4Al + 3Fe3O4 → 4Al2O3 + 9Fe |
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