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16 Cards in this Set
- Front
- Back
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What is the difference between a physical change and a chemical change?
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In a phyical change the size or shape changes. In a chemical change elements are rearanged to make a new substance.
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How can you tell that a chemical change has occurred?
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fire/buring
color change without dye new gas creaded heat released heat aborbed |
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What is conservation of mass?
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Must be the same amount of each element in the reactions as in the products.
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What does conservation of mass mean it turms of the elements involved in the chemical reaction?
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Elements must remain the same, but they can rearrange, and split to form new componds. The number of elements remains the same as the reactions and products.
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Ion
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When an atom loses or gains elections
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Ionic bonding
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when atoms are transphered in order to make a full valence
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Octet rule
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when an atom has full valence
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Oxidation number
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Overall change of an element once it becoms an ion
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Polyatomic ion
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a charged ion composed of 2 or more atoms bonded`
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Valence
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8 elections on the outer most ring of an element
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What is the relationship between valence and oxidation number?
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Oxidation number is the overall change after it becomes an ion and the valence is when it has 8 electrons on the outer most ring.
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Is an atom with 7 valence elections likely to lose or gain elections?
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Gain, because it only needs one election to have full valence.
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What is the oxidation number for an atom with 2 valence elections? Why?
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+2 it will lose, because it only needs to lose 2 electons to be full valence
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Why do atoms form ionic bonds? (2 reasons)
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1) to transpher elections to reach full valence
2) to become stable, the + ion attracts with the - ion |
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What is a reactant?
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origional substance (before reaction)
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What is a product?
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Created durring reaction (end substance)
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