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| Heat of Reaction (lowest energy possible) |
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| Why do metallic bonds conduct electricity? |
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Definition
| They are surrounded by a "sea" of mobile electrons. |
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| How can you tell if it is a strong or weak bond? |
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| How much energy it takes to seperate the atoms, so if it has a high or low melting point. |
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| What is the __ - __ - __ for a body-centered cube? |
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| What is the __ - __ - __ for a face centered cube? |
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| What is the __ - __ - __ for a hexagonel close packed thing? |
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| Define a substitutional alloy. |
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| When replacement metals in an alloy are approximately the same size, they will replace eachother in the metallic crystal, the alloys formed are called this. |
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| When replacement alloys are different sizes, and the smaller ones fit into the spaces in the alrger ones, what is it called? |
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| What is an example of a substitutional alloy? |
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| What is an example of an interstitial alloy? |
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| What are 4 advantages of alloys? |
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Definition
1) harder/higher melting point
2) more malleable
3) more durable
4) less chemically reactive |
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| For an electron to be transfered, what does the difference in electronegativity have to at least be? |
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| KNOW HOW TO DRAW STRUCTURE OF COMPOUNDS..... |
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| What does the ratio have to be for a compound to be reactive? |
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| Write the formula for ammonium perchlorate.(polyatomic ion, use reference tables) |
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| NH4ClO4 (both 4s are subscripts) |
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| Do ionic compounds conduct electricity? Why? |
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Definition
| No, b/c they don't have electrons floating around. |
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| When will electrons be shared? |
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Definition
| When the electronegativity is similar. |
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| Define non-polar covalent bonds. |
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Definition
| Electrons are shared EQUALLY. |
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| What is the best way to have a non-polar covalent bond? |
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Definition
BE THE SAME ELEMENT!!!
(same electronegativity) |
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| What is a way, besides same electronegativity, to have a non-polar covalent bond? |
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Definition
| If it is structurally balanced, despite a polar-covalent bond, it will be non-polar. |
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| A bond = how many electrons? |
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| Define polar-covalent bond. |
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| electrons are shared UNEQUALLY. |
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| The bigger the difference in electronegativity = more or less polar? |
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