He used that name because if you lit hydrogen on fire it would catch. therefore, it was dangerous to be around. think of it as a kind of warning. :) hope that helps.
Answer:
it's answer 2
Explanation:
magnets can only move metal
Answer:
B. wave 1 has a larger wavelength than wave 2
1. A) Colloids only
2. C) M<span>olecules of the dispersion medium colliding with dispered phase particles
Hope this helps!</span>
