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11 Cards in this Set
- Front
- Back
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A covalent bond is a (?) That forms when (?) Is (?). |
Strong bond. A pair of electrons. is shared between two atoms. |
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Simple molecular substances are made up of molecules containing.... |
A few atoms joined by covalent bonds. |
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Examples of covalent bonds |
Hydrogen Water Methane Hydrogen chloride Oxygen Carbon dioxide |
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Substances containing covalent bonds usually have.... |
Simple molecular structures |
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The atoms within the molecules are held together by |
Very strong covalent bonds. By contrast, the forces of attention between these molecules are very weak |
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To melt or boil a simple molecular compound, you only need to break these... |
Feeble intermolecular forces, and not the covalent bonds. So the melting and boiling point are very low. |
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Most molecular substances are... |
Gases or liquids at room temperature |
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As molecules get bigger, the strength of the intermolecular forces... |
Increases, so more energy is needed to break them. And the melting and boiling point increase |
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Polymers are made of.... |
Covalently bonded carbon chains |
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Famous example of a polymer... |
Poly(ethene) |
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How are polymers formed? |
When lot's of small molecules called monomers join together |
