Which of the following is evidence that a chemical change is occurring?

a. Cherry drink mix is added to water and the resulting
solution is red.

b. A white powder is added to cool tap water in a beaker
and the beaker gets hot.

c. Water is added to coffee until the solution becomes
clear.

d. Water is added to sand and the sand looks darker

c. water is added to coffe until the solution becomes clear

c

Explanation:

Water is added to coffee until the solution becomes

clear.

have a great day because if you dont you and i will be sad

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.