Based on Charles's law, which of the following statements is true for an ideal gas at a constant pressure and mole amount? The number of collisions is independent of volume.
The number of collisions decreases with increase in volume.
Volume is directly proportional to absolute temperature.
Volume is inversely proportional to absolute temperature.

Volume is directly proportional to absolute temperature.

Explanation:

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

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