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  • Stage 1

    Answer 4 questions correctly in a row.

This passage describes a chemical reaction. Read the passage. Then, follow the instructions below.
Hydrogen peroxide, a household disinfectant, breaks down into water and oxygen gas over time. Light speeds up this process, so hydrogen peroxide is typically stored in a dark-colored bottle. The bottle's dark coloring blocks light and makes the hydrogen peroxide last longer.
Complete the sentence.
In this chemical reaction, 
oxygen
 is a 
reactant

.
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