Required Practicals P2 Flashcards
1
Q
What effects RoR
A
- temp
- catalyst
- SA
- concentration/ pressure
2
Q
Ways to measure RoR
A
Rate a product is formed or rate reactant is used up
3
Q
What does the RoR gas practical investigate
A
- how the conc of hydrochloric acid affects rate of reaction w magnesijm
4
Q
What is the equation for the cross experiment
A
Sodium thiosulfate solution + hydrochloric acid = sulfur
5
Q
Steps for the cross experiment
A
- put 10cm of sodium thiosulphate into a flash
- put flask over a black cross
- add 10cm of hydrochloric acid and mix
- start stopwatch and look down into flask
- stop clock when csnt see cross
- redo w dif concentrations of sodium thiosulphate solution
- repeat again and calculate mean
6
Q
Gas RoR experiment explained
A
- put 50cm of hydrochloric acid into flask
- attack to bung and delivery tube
- add to a container and a cycliser over the tube
- add a strip of magnesium and start stopwatch
- measure vol of gas produced in the cylinder every ten seconds
- repeat w dif concentrations of acid
7
Q
Ways to establish the water is pure
A
- put water on universal indicator and should turn green
- weigh a basin w/of water, evaporated water in it, and then weight again- if any mass gained there is dissolved solids
- purify w distillation
8
Q
How to purify water w distilation
A
- comical flask on tripod has a tube connected to a tube which is in a beaker of ice
- heat flask so water goes into ice bath tube
