Which of the following statements is not accurate? a. at constant temperature, halving the number of gas particles in a given space will cut the pressure in half. b. at constant volume and mass, increasing the temperature will cause gas particles to move faster and create more collisions. c. at constant temperature, increasing the number of gas particles in a given space will decrease the number of collisions on the walls of the container. d. at constant temperature, doubling the number of gas particles in a given space will double the pressure.

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

dynamic equilibrium is the answer.