Which of the following is an example of observational scientific investigation? A. mixing two reactants together in a small beaker. B. noting the color of a solution when heated. C. placing test tubes

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asked Jan 1, 2018 230k views

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Which of the following is an example of observational scientific investigation?

A. mixing two reactants together in a small beaker.
B. noting the color of a solution when heated.
C. placing test tubes in an ice bath for 15 minutes.
D. drying solid produced by placing it in an oven.