HELP PLEASE Which statement best describes a physical change?

A. Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.

B. Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.

C. Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.

D. Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.

A

Explanation:

I think A would be the answer however I am not absolutely sure.

Maybe C) or B)

Its Confusing bro, Im sorry!

just try or wait for other Answers!!

but still i think its C)

anyway, Goodluck!

the correct answer is: d. the saltine and pretzel are made of flour, yeast, and baking soda, and salt. the pecan contains no flour but it does contain fats. the pecan is a nut that can be consumed as a healthy snack. first of all, pecans are a source of fat (monounsaturated fat), but they provide less fat than some other nuts. pecans are a rich source of dietary fiber, manganese magnesium, phosphorus, thiamin, vitamin e…

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.