# CHEMISTRY AND GAS PROPERTIES

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

### Clues

• Th is gas is lighter than air and puts out a flame, divers often use this gas (6)
• This is a brown gas and is poisonous. It causes acid rain (8, 7)
• This is the gas in gas taps, it burns with a blue flame (7)
• This is the gas we breathe, it puts flames out and turns limewater a milky colour (6, 7)
• This is the gas we need to stay alive, it relights a burning splint, and it is needed for burning (6)
• This makes up 78% of the air, a glowing splint will go out and the gas is very unreactive (8)
• Used in lightbulbs and doesn't react at all (5)