OCR 21st century C1,2,3

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

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)