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| 1 | |
Ionic compounds are |
| | A) | crystalline solids at room temperature and have low melting points |
| | B) | liquids, gases, or solids at room temperature and have high melting points |
| | C) | crystalline solids at room temperature and have high melting points |
| | D) | crystalline solids at room temperature and do not usually conduct electricity when dissolved in water |
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| 2 | |
Which of the following best describes a molecular compound? |
| | A) | Low melting point, low solubility, and no electrical conductivity as a liquid |
| | B) | Crystalline solid at room temperature, high melting point, and no electrical conductivity as a liquid |
| | C) | Liquid at room temperature, high melting point, low solubility |
| | D) | Solid at room temperature, low high solubility, high melting point |
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| 3 | |
Which of the following is true? |
| | A) | Most ionic compounds have low solubility in water. |
| | B) | Most ionic compounds have high solubility in water. |
| | C) | Most molecular compounds have high solubility in water. |
| | D) | Most molecular compounds conduct electricity when dissolved in water. |
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| 4 | |
An unknown compound dissolves in water, conducts electricity when dissolved in water, and has a melting point of 810°C, and is a clear, white crystalline solid. It is a(n) |
| | A) | ionic compound |
| | B) | organic compound |
| | C) | molecular compound |
| | D) | molecular solid |
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| 5 | |
Molecular compounds are composed of |
| | A) | both metals and nonmetals |
| | B) | metals only |
| | C) | Group IA and Group IIA elements |
| | D) | nonmetals only |
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| 6 | |
Which of the following best describes the elements chlorine and sodium? |
| | A) | Chlorine has seven valence electrons and sodium has two valence electrons. |
| | B) | Chlorine is a Group VIIA element and sodium has one valence electron. |
| | C) | Chlorine has 7 valence electrons and sodium is a Group IIA element. |
| | D) | Chlorine has 17 valence electrons and sodium has one valence electron. |
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| 7 | |
Which statement is most correct? |
| | A) | Group VIIA elements all have seven electrons and include neon. |
| | B) | Group VIIA elements have all seven valence electrons and include oxygen and sulfur. |
| | C) | Group VIIA elements have all seven valence electrons and include fluorine and chlorine. |
| | D) | Group VIIA elements all have seven electron pairs in their valence shell. |
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| 8 | |
Which statement is true? |
| | A) | Elements in the same period have the same number of valence electrons. |
| | B) | Elements in the same group have the same number of valence electrons. |
| | C) | Nitrogen and chlorine both have seven valence electrons. |
| | D) | Electron pairs are always involved in bonding, while unpaired electrons are often not involved in bonding. |
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