When an object with an electric charge of -9.0uC is 4.0 cm from an object with an electric charge of 5uC , the force between them has a strength of 252.8 N . Calculate the strength of the force between the two objects if they are 12cm apart.

Round your answer to significant digits.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

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