Data were collected for trial 1 to determine the molar mass of a nonvolatile solid solute when dissolved in cyclohexane.

mass of cyclohexane 10.14g
mass of added solute .255g
kf value for cyclohexane 20.0
freezing point change δtf(°c) 3.04

what is;
mass of cyclohexane in solution (kg)
moles of solute, total (mol)
mass of solute in solution, total (g)
molar mass of solute (g/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 density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.