At a certain temperature, kc equals 1.4 × 102 for the reaction: 2 co(g) + o2(g) ⇌ 2 co2(g). if a 3.50-l flask contains 0.400 mol of co2 and 0.100 mol of o2 at equilibrium, how many moles of co are also present in the flask? a) 0.700 mol b) 0.200 mol c) 0.107 mol d) 0.0114 mol

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

the pseudoscience are like beliefs, theories, or like practices that are considered scientific