An experiment is performed in which a crystalline substance is added to a beaker filled with room temperature water. The following observations are made: I. The crystals dissolve

II. A precipitate is formed.

III. The bottom of the beaker feels warm to the touch.

IV. Bubbles begin forming within the water.

All of the observations are evidence of a chemical change EXCEPT -

Group of answer choices

I.

II.

III.

IV.

elements make up everything, and they combine to make compounds.

the answer is c

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.