OCR 21st century C1,2,3

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

Clues

  • Brine (salt water) contains Sodium Chloride, what process can we use to remove the chlorine? (12)
  • Crude oils contains chain of carbon and hydrogen, what are these chains called? (12)
  • In which gas would fuel burn better - pure oxygen or air? (4, 6)
  • What do we mostly use crude oil for? (4)
  • What element makes coal? (6)
  • When oxygen combines with another element, what is it known as? (9)
  • When oxygen is removed from a compound, what is this known as? (9)

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