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science90
i need to know these things
| Question | Answer |
|---|---|
| chemical formula | a chemical formula uses these chemical symbols to represent the atoms of the elements and their rates in a chemical compouns |
| subscript | a subscript is a number written to the right of a chemical symbol and slightly below |
| Ionic Bond | the force of attraction between positive and negative ions |
| covalent bond | a pair of shared electrons between two atoms is called a covalent bonds - elements that are hear each other - weaker than ionic bonds, can be broken easily |
| polar covalent bonds | a covalent bond in which the electron are shared unequally |
| molecule | a group of atoms held together by covalent bonds |
| metallic bonds | the equal sharing allows the electrons to move easily among the atoms. |
| What are 3 forms of carbon? | diamond, graphite, fullerene |
| Why does a mixture of sodium and chloride and water conduct electricity but a sodium chloride crystal does not? | sodium chloride is an ionic bond so it needs water to conduct electricity, water has minerals but sodium chloride doesn't have minerals so it needs water to conduct electricity. |
| What are most substances? | compounds |
| When does an atom become a positive ion? | loses an electron to another atom. Will give up or take along with its charge. Lewis dot structure. Use periodic table. Atoms with 4 valence cango either way |
| Metallic bonds make many metals | good conductors of electricity |
| oxidation nuimber | amounbt of electrons in an atom |
Created by:
sweetie13
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