Match the characteristics with the states of matter.
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a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:
in the experiment, a catalyst is added to concentrated hydrogen peroxide.
the hydrogen peroxide decomposes rapidly, according to the equation
2h₂o₂(ℓ) ⟶ 2h₂o(ℓ) + o₂(g)
new substances are formed, and old ones disappear, so this is a chemical reaction.
the reaction also releases a large amount of heat.
the rapidly-expanding oxygen gas caries with it droplets of water and hydrogen peroxide (and probably some steam, as well).
the visual effect is like a genie escaping from its bottle.