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hope this helps. Cutting a gold bar in two pieces and then putting the pieces next to each other: It is a physical change but it is not reversible as original state is not achieved again. b) burning a match and then relighting it: This is a chemical change as new substances are formed.
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It's important to follow the steps outlined in the scientific method carefully
so that the results would be due to the specific variables tested and not due to something else. Not only that but this also allows other researchers to follow the steps and carry out the same experiments.
Researchers can prevent mistakes and errors in their experiments by
carefully selecting variables, following the steps outlined in the procedure and carefully and accurately measuring quantitative data
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