Enthalpy definitions quiz wordsearch (OCR)

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

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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