A shopping mall wanted to determine whether the more expensive “Tough Stuff" floor wax was better than the cheaper “Steel Seal” floor wax at protecting its floor tiles against
scratches. One liter of each grade of floor wax was applied to each of the 5 ¢st sections of the
main hall of the mall. The test sections were all the same size and were covered with the
same kind of tiles. Five other test sections received no wax. After 3 weeks, the number of
scratches in each of the test sections was counted. what is the experimental variable?
Hi

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

it is the minimum amount of material needed to sustain a fission reaction.

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining.   at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.