In English
7. Name the elements found in nature in diatomatic form.
8. What is the difference between double and triple single link?
        
             
        
        
        
Color change bubbles and i think dissolving
        
                    
             
        
        
        
invisable
you probably dont want to put that...
 
        
             
        
        
        
Answer:
–500KJ
Explanation:
Data obtained from the question include the following:
Heat of reactant (Hr) = 800KJ
Heat of product (Hp) = 300KJ 
Enthalphy change (ΔH) =..?
The enthalphy change is simply defined as the difference between the heat of product and the heat of reactant i.e 
Enthalphy change = Heat of product – Heat of reactant
ΔH = Hp – Hr 
With the above formula, we can easily calculate the enthalphy change as follow 
ΔH = Hp – Hr
ΔH = 300 – 800
ΔH = –500KJ.
Therefore, the overall energy change for the reaction between hydrogen and oxygen shown in the diagram above is –500KJ
 
        
             
        
        
        
Answer:
The answer to this question has been described in details on the screenshots attached to this question.
Thanks. Hope it helps