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Papessa [141]
4 years ago
8

Select the correct answer. A student places a sample of white sodium bicarbonate powder in a test tube and heats it. The student

observes that the sodium bicarbonate undergoes a chemical change. After the change, what must be true about the substance in the test tube? A. It is not white. B. It is a liquid. C. It is an element. D. It is not sodium bicarbonate.
Chemistry
1 answer:
inessss [21]4 years ago
8 0

Answer is: D. It is not sodium bicarbonate.

Balanced chemical reaction of heating sodium bicarbonate:                    2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O.

This is chemical change (chemical reaction), because new substances are formed (sodium carbonate, carbon(IV) oxide and water), the atoms are rearranged, so there is no sodium bicarbonate (NaHCO₃) in the test tube.

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Answer:

The correct answer is control group.

Explanation:

A group used in a study or in an experiment, which does not get treatment by the scientists and is used as a foundation to determine the functions of the other tested subjects is known as the control group. The control group is only found in an experimental investigation.  

The group in an experiment, which gets the variable being examined is known as an experimental group. The comparison of an experimental group is done with a control group in order to find the answers in an experiment.  

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