lucarelli ROR/errors

how does concentration affect ROR?

increasing concentration of an aqueous reagent in a given volume increases ROR

more reactant particles in a given volume

=more frequent collisions

=more frequent successful collisions (colliding with enough energy to overcome activation energy and at the correct orientation)

=increase ROR

why will methane gas burn more quickly if under higher pressure

higher pressure means the molecules are pushed closer together, decreasing the distance between the molecules

decreasing the distance between the molecules increases the frequency of colisions between them

resulting in more frequent successful collisions (elaborate)

hence ROR increases

how does raising temperature of reagents increase ROR?

higher temperature = reactant particles have higher average kinetic energy

= increased proportion of collisions with energy that is equal to OR greater than Ea

= increased proportion of successful collisions

hence ROR increase

how does state of subdivision (surface area to volume ratio) affect ROR?

increasing surface area:V ratio exposes a greater amount of reacting particles to collision =increased freq of collisions =increased freq of successful collisions = ROR increase Signup and view all the answers

state alteration that could increase reaction rate between solid copper oxide and sulfuric acid

increase concentration of sulfuric acid use a more finely powdered solid copper oxide (higher surface area to volume ratio) increase temperature of reaction mixture use suitable catalyst Signup and view all the answers

testing reaction CaCO3(s) + 2HCl(aq) -> CaCl2(aq) + H2O(l) + CO2(g)

if a cotton wool plug is not used some solution may be lost due to its vigorous fizzing. How would the loss of solution cause an error in the determination for the mass of CO2(g) produced? Would this be a systematic or random error and how would it affect the calculated rate of reaction for each experiment? Explain.

If spattering occured then the mass loss of the flask and its contents would be due to the loss of CO2 and solution the assumption that mass loss = mass loss of CO2 would be incorrect the true mass of CO2 formed would be less than total mass lost thus, mass of CO2 produced appears higher than it actually was and the resulting rate would also appear higher than it actually was consistent errors like this are systematic errors Signup and view all the answers

the procedure the student used involved allowing the reaction mixture to lose 0.2g in mass, equivalent to an STP volume of CO2 of ~ 200mL, before she started timing for the 0.3g weight loss. Suggest a reason why it was important to do this. Remember carbon dioxide gas is much denser than air.

CO2 is denser than air so as it forms it will fill the flask from the solution level upwards thus initially it will be the air in the flask that is expelled rather than CO2 Signup and view all the answers

for reaction Zn(s) + 2HCl(aq) -> ZnCl2(aq) + H2(g), what are three ways to measure rate of reaction

volume of hydrogen gas formed (mL) / time taken (s) mass of Zn used (grams) / time taken (s) Signup and view all the answers

lucarelli ROR/errors

Questions and Answers

how does concentration affect ROR?

why will methane gas burn more quickly if under higher pressure

how does raising temperature of reagents increase ROR?

how does state of subdivision (surface area to volume ratio) affect ROR?

state alteration that could increase reaction rate between solid copper oxide and sulfuric acid

the procedure the student used involved allowing the reaction mixture to lose 0.2g in mass, equivalent to an STP volume of CO2 of ~ 200mL, before she started timing for the 0.3g weight loss. Suggest a reason why it was important to do this. Remember carbon dioxide gas is much denser than air.

for reaction Zn(s) + 2HCl(aq) -> ZnCl2(aq) + H2(g), what are three ways to measure rate of reaction

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