Edexcel Chemistry GCSE paper 2 - my answers Watch

Dayo03
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This is what I got - not saying its right - feel free to disagree or add more

6.92 for lithium empirical formula

2.25 for mass on MgO

4 + (for the charge)

1x10^-7 for 100 nm

hydrobromic acid - when HBR dissolves in water

the table one was about halogen displacement reactions - iodine is less reactive so gets displaced

6 marker on collision theory :
Concentration: If there is more of a substance in a system, there is a greater chance that molecules will collide and speed up the rate of the reaction. If there is less of something, there will be fewer collisions and the reaction will probably happen at a slower speed.
Increasing the surface area of a solid reactant exposes more of its particles to attack. This results in an increased chance of collisions between reactant particles, so there are more collisions in any given time and the rate of reaction increases.

Nanoparticles do not leave a white mark on the skin - good for sunscreen
however, there hasn't been much research so we don't know long term effects

unsaturated means double bond so can still react with other elements as bond breaks up

in bromine water ethene turns it colourless , poly ethene no as it doesn't have a double bond

kerosene - used for aircraft

kerosene compared to diesel oil - easy ignition, less viscous, low boiling point etc

the one about the Molecular formula for CH2 was C6H12

Test for chlorine - blue litmus paper turns red then bleaches white

1.5 x 10^21 for the avogadros contant question

In the production of ethanol - can't be 80 degrees or yeast gets denatured

To get the mass of the alcohol needed to change the temp of water: light spirit burner and wait for of water to change by 20 degrees then reweigh the spirit burner and calculate the change in mass

82.7 for carbon in butene

lithium is less reactive than potassium because it has less shells so it would be harder to lose the electron as there is a stronger force of attraction between the nucleus and the outer electron

butane and pentane are neighbours because they differ by a CH2 unit

CO2 levels change due to burning fossil fuels (not always the same amount of co2 released)
deforestation and afforestation (dk if this is right tho)

electron configuration for NaCl after reaction was:
Na - 2.8
Cl 2.8.8

for exothermic - energy used to form bonds > energy used to break bonds - overall negative energy change

colour and state of astatine - black and solid

I can't remember the hydrocarbon (think it was Ethane or ethene ) - it produced CO2 and H20 - then had to balance it
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Dayo03
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hehe_x
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more or less what I got
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hehe_x
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what grade u aiming for?
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Dayo03
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(Original post by hehe_x)
what grade u aiming for?
an 8, wbu ?
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hehe_x
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a 9, but paper 1 didn't go that well
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