Answer:
The correct answer is oxygen.
Explanation:
Hope this helped Mark BRAINLEST!!
 
        
                    
             
        
        
        
Answer:
The change of the wick to carbon from the burning is a chemical change
 
        
             
        
        
        
Answer:
Either (1.) Fossils or (2) Radiometric dating.
Explanation:
Fossils are an obvious answer to this, but radiometric dating is the method most scientists use to find the age of rocks. Radioactive isotopes break down predictably, so the farther along this process is, the older the rock is.
 
        
             
        
        
        
Answer:
159.808 g/mol
Explanation:
Br itself is 79.904 g/mol. So multiply it by two.