fuels and heat (experiment) calculate the heat of reaction of HCI with NaOH

Question 1

define heat of reaction

Answer 1

heat change when the number of moles of reactants in balanced equation react

Question 2

suggest a possible material for the reaction vessel to avoid heat loss to surroundings

Answer 2

polystyrene

Question 3

state three ways of ensuring the rise in temperature was measured as accurately as possible

Answer 3

• accurate thermometer
• add quickly
• mix

Question 4

state one advantage of using a burette instead of graduated cylinder for measuring the base and adding it to the reaction vessel

Answer 4

more accurate

Question 5

state one disadvantage of using a burette instead of graduated cylinder for measuring the base and adding it to the reaction vessel

Answer 5

slow addition (so heat is able to escape)

Question 6

identify the hazard associated with the use of these solutions

Answer 6

• corrosive
• burns skin
• damaging eyes

Question 7

draw the warning symbol that should have been used to label both solutions

Answer 7

see diagrams in rev book of harmful and corrosive symbols

Question 8

draw the warning symbol that should have been used to label both solutions

Answer 8

see diagrams in rev book of harmful and corrosive symbols

Question 9

write the balanced equation associated with this experiment

Answer 9

HCI + NaOH = NaCI + H2O

Question 10

what experimental problem would have been encountered if 0.1 M NaOH and 0.1 HCI solutions had been used instead of 1.0 M solutions

Answer 10

> would have been

• very small temperature rise
• small heat change
• greater percentage error

Question 11

something to note

Answer 11

-if you are given a total heat capacity for the apparatus this = mc

Question 11

something to note

Answer 11

-if you are given a total heat capacity for the apparatus this = mc