Enthalpy definitions quiz wordsearch (OCR)

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

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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