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Sodium Sulphate removes water
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Why do molecules absorb infrared of specific frequencies?
They need a specific frequency to make them vibrate
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Production of Ozone Equation
3O2 -----> 2O3
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Which element is the more reactive in an ionic equation?
the one that becomes an ion
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cm3 to dm3
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N=CV units of N
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Chlorine uses
making PVC and treating water
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Why do permanent dipoles occur when referring to shape?
when the charges aren't symmetrical on either side
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What must you include in hydrogen bonding?
The lone pairs in the bond and making sure there is a line of three
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Large molecules don't dissolve because
-there is only one hydrogen bond per molecule -it would disrupt the stronger water bonds -rest of the molecule can't form hydrogen bonds
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Why reflux?
-avoids loss of volatile vapours -it contains flammable vapours
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Hydrogen bonds requirements
-OH bonds -polarised H
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Why distillation?
-to capture certian compounds -some compound do have lower boiling points -weaker molecular bonds -less hydrogen bonds
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Differentiating compounds from the same homologous series
Fingerprint region
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Current of a light shone on a battery
I = P ÷ area exposed
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Why is one pulse sent at a time when measuring distance?
-no interference -no overlap -the time of one pulse can be measured
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Finding the EMF on a graph
Look at when the current is zero because then there will be no energy loss
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Ionisation enthalpy over a period
increases because of an increase in core charge
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Ionisation enthalpy down a group
decreases down a group because of an increase in distance
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If the intensity of an incident light is increased, the current will increase and the EMF is independent of the light intensity, how I'll this look on a graph?
The line will begin higher and then end in the same place
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In order for the electrons to be released
The energy of the photons need to be large enough to be bigger than the work function of the material
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Dynamic Equilibrium
Both forward and backwards reactions are progressing. The concentration of each chemical stays the same
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Electron rule in 3 and 4 shell
2 electrons go to 4s before 3d
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a particle with an unpaired electron
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Production of a chlorine atom
CH3Cl -----> CH3 + Cl
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Activation Energy
the minimum combined energy on collison of particles that will lead to a reaction
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What happens if you increase the temperature in a reaction?
-rate of reaction increases -molecules gain more energy and move faster -more collisions with energy greater than the activation enthalpy -more successful collisions
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Minimum frequency of radiation equation
energy / plancks constant
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Why arent free radicals created in the lower troposphere?
UV does not have a high enough frequency at this point
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Sound waves in a vacuum
they do not transfer through a vacuum
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Sound waves longitudinal or transverse?
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Frequency unit in equations
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When the angle of incidence is equal to the critical
the angle of refraction is 90 degrees
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When the angle of incidence is creater than critical
all the light undergoes reflection
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Why does sound decrease in pitch when it moves away?
because the distance travelled by the wavefront increases
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180 degress in radians
pi radians
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90 degrees in radians
2pi radians (one wavelength)
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Current in a circuit
shared out and not used up over components
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When you rotate a polaroid why does the light get darker?
-reflected light is polarised -polarised light vibrates -polarised only allows vibrations to pass through -when planes are parallel the puddle appears lighter
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WHta are electrons known as in unit 2?
charge carriers
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Components in series
-the current is the sam,e all the way around -the resistance is proportionally shared between components -voltage decreases over the circuit
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Higher resistance in a component on voltage
voltage increases
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Higher resistance in a component on current
current decreases
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2d and d
1/r^2 and r
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doesnt move when heated
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moves when heated
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involved in the reaction
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Single bonds and rotation
free rotation around the CC bond
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When phenylethene reacts with bromine colour change
brown to colourless
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Reagent for for dehydration
-high temp -under reflux -conc H2SO4
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Other cards in this set

Card 2


Why do molecules absorb infrared of specific frequencies?


They need a specific frequency to make them vibrate

Card 3


Production of Ozone Equation


Preview of the front of card 3

Card 4


Which element is the more reactive in an ionic equation?


Preview of the front of card 4

Card 5


cm3 to dm3


Preview of the front of card 5
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