Why is the c-h bond length and strength different for ethyne, ethene and ethane?

The energy associated with a chemical bond formation determines the bond strength and its proportion/degree determines its bond length.

Explanation:

When the bond energy is higher, the 'stronger' we say the bond is between the two atoms become, and the distance between its atoms (bond length) is smaller.

answer; i believe that the correct answer is (a) potassium(k)

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