Answer:
Explanation:
Driving a car (burning gas is a chemical change) and almost all the plastics we use are made by chemical reactions of different components. 
 
        
             
        
        
        
Answer:
4.90 M
Explanation:
In case of titration , the following formula can be used -
M₁V₁ = M₂V₂
where ,
M₁ = concentration of acid ,
V₁ = volume of acid ,
M₂ = concentration of base,
V₂ = volume of base .
from , the question ,
M₁ = ? M
V₁ = 125.0 mL
M₂ = 4.56 M 
V₂ = 134.1 mL 
Using the above formula , the molarity of acid , can be calculated as ,
M₁V₁ = M₂V₂  
Substituting the respective values ,  
M₁ *  125.0 mL = 4.56 M *  134.1 mL 
M₁ = 4.90 M
  
        
             
        
        
        
Scientific Notation Is Basically The Shorthand For Writing Numbers. Scientists Use It When They Want To Write Numbers That Are Very Big Or Very Small.