Enthalpy definitions quiz wordsearch (OCR)

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B A V E R A G E B O N D E N T H A L P Y G
O Y F X I U Q V L J I E S T E X H G H N Q
U E M R W E O Y S D Y P A T P S C E A H P
R T F V G W V G I D V P H V U T L M O M J
E A B D I G C R S O A Y J W S A B K J O I
S T J O B O W E E Q K Q H R J N E L Q U R
P S Q I H F C N H T G X A D I D H B P J F
I D Y E B J E E T L M B C I X A L B F C C
R R M W I K N N N C W O Q D T R O J T W M
A A C E C C T O Y I L N P F I D M M X O P
T D W I C I H I S M G D A B H C S P M Q D
I N B X P M A T O R T E Q N G O Q W L O B
O A F N T R L A T E D N L J R N P S X F V
N T H D V E P V O H A T O T U D K Q D B I
V S A C B H Y I H T F H T F C I V N P O I
C K X N P T C T P O D A E S C T L H Q X L
J M Q B T O Y C H D Q L B Q K I B H M E M
F K U N V X C A F N R P T N F O J P J Q P
C J C H A E L M V E Q Y T G O N Q L W P Q
U I B Q R O E F H L D Q O V M S N M T U C
V V F H F G D I Q J I O R N V O G Q N H L

Clues

  • An example of an endothermic reaction. (think of plants). (14)
  • An example of an exothermic reaction. (think of animals). (11)
  • What are: a pressure of 100 kPa, a stated temperature 298 K or (25 degrees celsius) and a concentration of 1.0 mol per dm cubed classed as ? (8, 10)
  • What is a diagram showing alternate routes between reactants and products which allows the indirect determintation of an enthalpy change from other known enthalpy changes using Hess' law. (8, 5)
  • What is the average enthalpy change that takes place when breaking by homolytic fission 1 mol of a given bond in the molecule of a given species. (7, 4, 8)
  • What is the enthalpy change that takes place when breaking by homolytic fission 1 mol of a given bond in the molecules of a gaseous species. (4, 8)
  • What is the minimum energy required to start a reaction by the breaking of bonds. (10, 6)
  • What is the name of a reaction whereby the enthalpy of the products is larger than the enthalpy of the reactants ? (this causes heat to be taken in from its surroundings). (11)
  • What is the name of a reaction whereby the enthalpy of the products is smaller than the enthalpy of the reactants ? (this causes heat to be lost to its surroundings). (10)
  • What is the physical state of a substance under the standard conditions of 100 kPa (1 atmosphere) and 298 K (25 degrees celsius). (8, 5)

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