rate of reaction test
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2 pieces of measuring apparatus to find the rate of production of gas
gas syringe stopwatch
3 conclusions about the rate of reaction between magnesium and dilute hydrochloric acid
• rate of reaction is fastest between 0 and 10 secs • rate of reaction decreases between 0 and 60 secs • all of the acid has reacted by 60 secs
correct statements
more bubbles were produced in the first 10 secs magnesium was used up more quickly
change to apparatus to improve accuracy
using a polystyrene cup instead of a glass beaker to minimise energy transfer to the surroundings
control variable to use
concentration of hydrochloric acid
uncertainty
+- 0.2
possible error other than anomalous point
poor stirring so not all element had dissolved
yield if temperature is higher than 250C
decreases because the backwards reaction is endothermic so the equilibrium would move to the left in order to oppose the increase in temp
how does a catalyst increase the rate of reaction
provides alternate route which has a lower activation energy so, less energy is needed for the reaction to take place.
why does a higher pressure give a greater yield of methanol and increased rate of reaction
less moles on right side of the equation so, increasing the pressure moves the equilibrium to the right in order to decrease the pressure increased pressure means there are more molecules in a given volume so more frequent successful collisions.