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What is fractional distillation and how does it work.
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The rate of reaction between marble chips and hydrochloric acid can be increased by: a) increasing the concentration of the hydrochloric acid, b) increasing the temperature of the hydrochloric acid. Explain why in terms of the reacting particle model.(6)
How can we calculate product yield using reactants and reaction stoichiometry?
The equation for the reaction of carbon and nickel dioxide is: NiO + C ----> CO + Ni Calculate the percentage atom economy of this reaction to produce nickel to 3 significant figures.
In one experiment, the temperature of 50 g of water increased from 22.0 °C to 38.4 °C. The mass of alcohol burned was 0.8 g. Calculate the heat energy (Q) in joules, released by burning 0.8 g of the alcohol.
In the equation 2Na + 2H2O ---> 2NaOH + H2, is Na oxidised or reduced and why?
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