Enthalpy definitions quiz wordsearch (OCR)

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

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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