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Guess the Substance

Instructions: Use the clues to find the name of substance. You may use a periodic table if needed.

1.
Guess the gas:
Clue 1: I contain the elements carbon and oxygen.
Clue 2: I am used in fizzy drinks and fire extinguishers.
Clue 3: I have the chemical formula $CO_2$ and am needed by plants for photosynthesis.

I am the gas:
2.
Guess the metal:
Clue 1: I am an unreactive metal and was first discovered around 5000 BC.
Clue 2: I am very expensive.
Clue 3: I am used to make jewelry and have the chemical symbol Au.

I am the metal:
3.
Guess the gas:
Clue 1: I am a colorless gas that is lighter than air.
Clue 2: I am very unreactive and am used in balloons.
Clue 3: I can make your voice go very high pitched.

I am the gas:
4.
Guess the liquid:
Clue 1: I contain the elements hydrogen and oxygen.
Clue 2: I freeze at zero degrees Celsius and boil at 100 degrees Celsius.
Clue 3: You need to drink me to survive.

I am the liquid:
5.
Guess the metal:
Clue 1: I am a gray metal that doesn't rust.
Clue 2: I am strong, light and one of the most commonly found metals in Earth's crust.
Clue 3: I am used to make airplanes, drink cans and cooking foil and have the chemical symbol Al.

I am the metal:
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