Which of the following correctly identifies steps used in the fractional distillation of petroleum? A. The mixture is cooled, condenses, then heated and boils.
B. The mixture is heated, condenses, then cooled and boils.
C. The mixture is heated, boils, then cooled and condenses.
D. The mixture is cooled, boils, then heated and condenses.

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

i have no clue hope you find the answer

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

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