Answer:
The answers are options 1, 2, 3, and 5.
Explanation:
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When an experiment is carried out and less product is obtained, it may be because:
There are impurities in the substances.
The reaction might not go to completion.
The amount of one of the reactants might be measured incorrectly.
The expected amount might be based on measurements with error.
We conclude that the answers are options 1, 2, 3, and 5.