Return all unused chemicals to their original containers true or false

no

Explanation:Unused chemicals are never returned to their original containers because you will be contaminating the chemical. Dispose of unused chemicals in the proper containers.

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.