During a chemical change, substances react in characteristic ways to form new substances with different physical and chemical properties. Examples of
chemical changes include burning of wood, cooking of an egg, rusting of
iron, and souring of mik.
Examples of Chemical Changes
You may have noticed another chemical change. Over time, some pennies
change color from copper to green. This color change happens because of a
chemical change. The copper metal that makes up a penny combines with

possibly, yes.

explanation:

the amount of sugar you take in is dangerously high, risk of heart disease, high risk of diabetes, and etc.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

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.

d

explanation: