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21 Cards in this Set
- Front
- Back
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Factors that affect rate? |
Concentration/Pressure temperature catalyst |
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What happens when you increase [ ] ? |
more frequent collisions and increases rate of reaction as there are more moles. |
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Does doubling reactants increase rate of reaction? |
not necessarily as collision with enough energy to overcome EA will perform a chemical reaction. |
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What is Ea? |
minimum amount of energy require to start a chemical reaction. |
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When temperature increases .... |
peak flattens and curve broadens as there is greater spread of molecular energy. larger fraction of molecules overcome Ea, more frequency of collision and effective collison. |
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Condition of Kinetic theory |
neglible volume of gas exerts no pressure obeys equation pv= mrt |
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limitation of ideality |
high pressure and low temperature |
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Liquid |
definite volume as IMF keeps particles together. takes shape of container |
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Solid |
strong IMF forces and has high density where it cannot be compressed easily. |
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Freezing |
kinetic energy loss and IMF stronger so particles arrange in fixed positions. |
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Name the crystalline solids |
giant ionic solid, simple molecular,hydrogen bonded solid, metallic solid, giant covalent solid. |
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Giant ionic solid |
lattice particles ions held by strong ionic bonds face centred cubic structure high mp and bp soluble in water good elec and therm conductor |
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why do giant covalent solids have high mp and do not conduct electricity? |
many covalent bonds to break and they do not have mobile ions or electrons. have VDW between layers |
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Simple molecular solid |
intra bonding is covalent while inter is VDW low melting point |
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Diff between Graphite and Diamond
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Graphite has one free C electron to move between layers and held by week VDW forces so they slide over each other. |
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Giant molecular solid |
used as crucibles, glass and crockery |
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ceramic |
resistant to heat mostly giant covalent or ionic high mp not affected by solvent or eelctrical insulators |
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Haber Process |
low temperature favors exo therm reaction (higher yield). (450) high pressure favor side with less moles.(250) IRON CATALYST |
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equations of making ammonia |
nh3 +hno3 = nh4no3 2nh3 + h2s04 = (nh4)2so4 |
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weak acid |
partially dissociates and the more equilibrium lies to the left. |
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Relative molecular mass |
Average mass of an atom of an element relative to 1/12 mass of c12 |
