Pls help Asap this is on a timed quiz. А reaction is a process in which some substances change to other substances as chemical bonds break and reform.

A. Physical
B. Statistical
C. Chemical
D. Physiological ​

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Me pl give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

What is the increase in density of a medium due to wave travel?