> 
> Which of the following is a chemical change?
> 
> 
> A. Hydrolysis of a dipeptide.
> 
> 
> B. Stretching of a balloon.
> 
> 
> C. Freezing of water.
> 
> 
> D. Breaking a stick.
> 
> 
> 

I'm pretty sure that the answer is (A), but I'm not 100% positive.

I know that, for (C), you can freeze water, and then you can melt it back to liquid water.

For (D), you can break a stick, and the stick is still now two sticks.

For (B), however, I think that it is a physical change, but I'm not entirely certain.

Can someone please explain this for me?