Hi!
During a chemical reaction, some of the basic signs that a chemical reaction is occurring is a color change and heat / light also burning . You can clearly see these changes happening 
But changes in volume is a physical property, not a chemical. 
I hope this helps!
        
                    
             
        
        
        
B... These microbes are the foundation for life in hydrothermal vent ecosystems. Instead of using light energy to turn carbon dioxide into sugar like plants do, they harvest chemical energy from the minerals and chemical compounds that spew from the vents—a process known as chemosynthesis . (I got this off the web hope it helps)
        
             
        
        
        
Answer:
Lysosomes I believe are the parts of a cell that gets rid of waste.
 
        
             
        
        
        
Answer:
Explanation:
An aqueous solution is a solution in which the solvent is water. It is mostly shown in chemical equations by appending to the relevant chemical formula.