Chapter 6

Question 1

Enthalpy change in endothermic reaction

Answer 1

negative, heat is taken from surrounding

Question 2

Enthalpy change in exothermic reaction

Answer 2

positive, heat escapes to surroundings

Question 3

how to measure enthalpy change

Answer 3

calorimetry

Question 4

q=m.c.ΔT

Answer 4

q= heat gained or lost in joules
m- mass of liquid
c- specific heat capacity (8.14)
ΔT- change in temp

Question 5

STANDARD enthalpy change

Answer 5

when ONE mole of a compound is formed from elements after STANDARD conditions.

Question 6

Hess’s law

Answer 6

used to calculate enthalpy change for reactions that cant be directly found from the experiment

Question 7

Bond breaking is
Bond making is

Answer 7

endothermic
exothermic

Question 8

enthalpy of formation

Answer 8

energy changed when one mole of a compound is formed from elements in their standard states

Question 9

enthalpy of combustion

Answer 9

change in heat when one mole of a substance combusts completely in oxygen