energetics
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suggest one reason why enthalpy of combustion would be the same as the one calculated
same reaction/equation
suggest one reason why standard enthalpy of combustion of hydrogen to differ slightly
slight difference in bond enthalpy values
The student considered using a glass beaker on a tripod and gauze instead of the clamped copper calorimeter. Suggest two disadvantages of using a glass beaker on a tripod and gauze.
disadvantage 1 - glass is a poorer conductor than copper disadvantage 2 - tripod + gauze reduces heat transfer - tripod/gauze fixed height above flame
Suggest two reasons why the value of enthalpy of combustion from this experiment is less exothermic than a data book value.
reason 1 - incomplete combustion reason 2 - heat loss to surroundings
Suggest one addition to this apparatus that would improve the accuracy of the enthalpy value obtained
add lid
the enthalpy change for this reaction is quite small. by reference to number and types of bonds broken, explain how this was predicted
• same number of bonds broken and made • similar types of bonds broken and made