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This substance is in the gas state at room temperature and is made of hydrogen atoms only.

Watch the video, and try to answer these questions:

What is the flame?
Why can we see the flame?

Notes: see Teachers’ Guide

Practical notes: see Teachers’ Guide
teachers’ guide v1
teachers’ guide hs5

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v1: flames:hydrogen
v2: flames:methane
v3: more flames
v4: candle wax
v5: combustion
v6: decomposition

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