Answer: 1. Mass and type of solution
2. Type of material
3. Temperature
 
        
                    
             
        
        
        
To remove magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon.
        
             
        
        
        
Answer:
d) They're studying something for which they cant do an experiment 
Explanation:
 
        
                    
             
        
        
        
Answer:
Boiling is 212* Freezing is 32*
Explanation:
It simple facts