A hypothesis about what might happen in the lab might be 'oxygen will react with hydrogen to form water molecules'.
What is a hypothesis?
A hypothesis is a given explanation of a particular scientific question emerged by observing the real world.
Hypotheses are explanations that must be tested (either confirmed or rejected) by using the scientific method.
In conclusion, a hypothesis about what might happen in the lab might be 'oxygen will react with hydrogen to form water molecules'.
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