6 A reaction between a solution of sodium carbonate is mixed with a solution of
calcium nitrate to cause a precipitation reaction. If 338.9 mL of 0.799 mol/L sodium
carbonate is added to 677.4 mL of 1.159 mol/L calcium nitrate, what is the mass (in
g) of precipitate that forms? Provide your answer to two decimals.

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 cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.