Mol/mass calculations
what is avogadro's constant
there are 6.02x1023 atoms in a mol
how to separate different subtances dissolved in a liquid
chromatography
what does a catalyst do to the rate of reaction
increase it
what is the quadratic formula
(-b +- sqr(b2-4ac))/2a
how to find the circumference of a circle
diameter x pi
2 x pi x radius
mass of 5 mols of CHOOH
C=12 H=1 O=16
230g
what is the measurement calculated from chromatography
Rf / retention factor
what are the units for rate of reaction
g/s or cm3/s
what is the hypotenuse of a right angled triangle with a base of 12cm and a height of 5cm
13cm
what is the base of a right angled triangle with a hypotenuse of 10cm and a height of 5cm (1dp)
what is the mass of one molecule of methane
C=12 H=1
2.66x10-23
what is the stationary and mobile phase in chromatorgraphy?
mobile = usually a solvent or mixture of solvents
stationary = does not move eg the paper
what are the three ways rate of reaction can be measured/seen
dissapearing cross
loss of mass
gas produced
how to find the volume of a sphere
4/3 x pi x r3
what is the length of the circumference of a circle with a radius of 7cm with an angle of 54 degrees (1dp)
6.6cm
112g of methane reacted with 448g of oxygen , 252g of water was produced, what mass of carbon dioxide was produced?
308g of carbon dioxide
what is the word for 'a mixture that is always made with the same proportions of the same substances'
formulation
what does a reaction have to be for the energy of a reaction calculated to be accurate
a closed system
the probability Laura will be late on monday is 0.65
the probability of Laura not being late on tuesday is 0.47
what is the probability of Laura being late on either monday or tuesday?
0.465
what is the difference between the area of two circles with a radius 9cm and 7cm with both circles having the angle of 72 degrees to 1dp
81/5 pi
49/5 pi
20.1cm2
in a reaction iron oxide reacts with carbon to produce carbon dioxide and iron. calculate the mass of iron produced from 500g of iron oxide (unbalanced)
Fe2O3+ C --> CO2 +Fe
Fe=56 O=16 C=12
2Fe2O3+ 3C --> 3CO2 +4Fe
350g
what can be identified using silver nitrate
barium , chloride , iodine (ions for the points)
what can affect rate of reaction
temperature
catalyst
pressure
surface area
concentration of reactant
find the surface area and volume of a cuboid of dimensions (50 x 24.5 x 10
vol=12250
Sa=3940
name every circle theorem (x7)
a tangent meets a radius at 90 degrees
alternate segment theorem
angles in the same segment are equal
angle at the center is half at the circumference
tangents from the same point are equal
opposite angles in a cyclic quadrilateral are equal
angle in a semicircle is 90 degrees