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12 Cards in this Set
- Front
- Back
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What are the 7 diatomic species that exist by themselves? |
Elemental hydrogen, nitrogen, oxygen, fluorine, chlorine,bromine, and iodine |
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What three things do we need for a productive chemical reaction? |
1 – A collision, in 2 – The proper orientation, with 3 – Sufficient energy. |
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What is energy of activation used for? |
It is the certain amount of energy needed to break the bonds between atoms of the reactants |
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What happens if acollision occurs without sufficient activation energy? |
No reaction will occur |
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What happens if a process has a very small energy of activation? |
It is very easy to activate that process, so it will occur quickly and easily |
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What happens if a process has a very large energy of activation? |
It will occur slowly and maybe not at all |
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What is an example of something that has low activation energy? |
Burning gasoline |
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What is an example of something that has high activation energy? |
A diamond could decompose into graphite or charcoal, but the activation energy is so high that this never happens under normal circumstances |
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Define heat of reaction |
The total difference in heat energy that is released or absorbed in a process. (after bonds are formed, there may be energy left over, or the products may require more overall energy to form new bonds) |
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When a process absorbs energy... |
The heat of reaction is positive and it is endothermic |
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When a process releases energy... |
The heat of reaction is negative and it is exothermic |
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When any substance melts or evaporates, it must be _____________ |
Absorbing energy |
