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.

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.

D

Explanation:

The internal rate of return is :

The internal rate of return is defined as the net present value of an investment project is zero.

In other words, it is the return rate of any project over its useful life.

A mechanism or method to determine the rate of return of an investment.

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