At a certain temperature, the equilibrium constant at a certain temperature is 3.60. At this temperature, calculate the number of moles of NO 2 ( g ) that must be added to 2.53 mol SO 2 ( g ) in order to form 1.10 mol SO 3 ( g ) at equilibrium.

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

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

the answer would be b i believe

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.