Required Practicals P2

Question 1

What effects RoR

Answer 1

• temp
• catalyst
• SA
• concentration/ pressure

Question 2

Ways to measure RoR

Answer 2

Rate a product is formed or rate reactant is used up

Question 3

What does the RoR gas practical investigate

Answer 3

• how the conc of hydrochloric acid affects rate of reaction w magnesijm

Question 4

What is the equation for the cross experiment

Answer 4

Sodium thiosulfate solution + hydrochloric acid = sulfur

Question 5

Steps for the cross experiment

Answer 5

• 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

Question 6

Gas RoR experiment explained

Answer 6

• 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

Question 7

Ways to establish the water is pure

Answer 7

• 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

Question 8

How to purify water w distilation

Answer 8

• 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