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Flashcards in ENERGETICS Deck (20):
1

DEFINE ENTHALPY CHANGE

ENERGY CHANGE IN A REACTION AT CONSTANT PRESSURE

2

DEFINE STANDARD ENTHALPY CHANGE

ENTHALPY CHANGE UNDER STANDARD CONDTIONS (1 ATM, 298 K) WITH ANY SOLOUTION (1 mol dm^-3)

3

DEIFNE STANDARD ENTHALPY OF FORMATION

ENTHALPY CHNAGE WHEN 1 MOLE OF A SUBSTANCE IS FORMED UNDER STANDARD CONDITIONS

4

DEFINE STANDARD ENTHALPY OF COMBUSTION

ENTHALPY CHNAGE WHEN 1 MOLE OF A SUBSTANCE UNDERGOES COMPLETE COMBUSTION

5

EXOTHERMIC REACTION

ENERGY RELEASED INTO SURROUNDINGS, ΔH = -VE

6

ENDOTHERMIC REACTION

ENERGY TAKEN IN FROM SURROUNDINGS, ΔH = +VE

7

HESS's LAW

OVERALL ENTHALPY CHANGE DEPENDS SOLELY ON THE STARTING AND FINISHING SUBSTANCES, NOT THE ROUTE TAKEN

8

BOND BREAKING

ENDOTHERMIC, ΔH = +VE

9

BOND FORMATION

EXOTHERMIC, ΔH = -VE

10

BREAKING > FORMING

ENDOTHERMIC, ΔH = +VE

11

FORMING > BREAKING

EXOTHERMIC, ΔH = -VE

12

DEFINE AVERAGE BOND ENTHALPIES

AVERAGE ENTHALPY CHANGE FOR BREAKING 1 MOLE OF A PARTICULAR BOND IN A RANGE OF COMPUNDS IN THE GAS PHASE

13

DEFINE BOND DISSOCIATION ENERGY

ENERGY CHANGE REQUIRED TO BREAK A BOND (DEPENDS ON THE ATOMS THAT FORM THE BOND)

14

DEFINE SPECIFIC HEAT CAPACITY

ENERGY REQUIRED TO RAISE THE TEMP OF 1G OF A SUBSTANCE BY 1°C (WATER: 4.18 J G^-1 K^-1)

15

ΔHf, WHAT GOES AT BOTTOM? ARROW DIRECTION?

ELEMENTS, UP

16

ΔHc, WHAT GOES AT BOTTOM? ARROW DIRECTION?

OXIDES, DOWN

17

BOND ENTHALPIES, WHAT GOES AT BOTTOM? ARROW DIRECTION?

GASEOUS ATOMS, LEFT=DOWN RIGHT=UP

18

Q=mCΔT

m = MASS OF WATER HEATED
C = SHC OF WATER
ΔT = TEMP. CHANGE

19

Q TO PER MOLE

Q/MOLES OF SUBSTANCE

20

BOMB CALORIMETER

V. EXPENSIVE, BUT V. ACCURATE