Answer:
draw the carbon chain is containing 6 carbon then attach the aldehyde group with edge carbon in chain then put the put double bond at 3 no. carbon
 
        
             
        
        
        
this shows that magnesium is higher in the reactivity series than lead. 
I don't think there can be an ionic equation written because both components are in solid form and neither is in an aqeuos state.
 
        
             
        
        
        
 A molecule is usually reserved to represent the smallest particle of a compound.    
        
             
        
        
        
To produce glucose from carbon dioxide, 6 moles of carbon dioxide are required per mole of glucose.
Mass of carbon dioxide required:
6 x 44.01
= 264.06 grams