PH (potential of hydrogen) is a numeric scale that is used to show the acidity or basicity of an aqueous solution. It tells how acidic or alkaline a substance is . The pH values ranges from 0 to 14, such that acidic solutions have values between 1 to 6.9 with most acidic having a pH value of 1 and those that are basic have values from 7.1 to 14, with most acidic having a value of 14. Acidic compounds contain replaceable hydrogen ions while basic compounds contain hrdroxyl ions. In this case, a coke has a pH of 3.5 (acidic) which means that it has an excess of hydrogen ions (H+) and would be called an acid.
        
                    
             
        
        
        
Answer:
metals can be magnetic.
Explanation:
certain types of metals are magnetic.
 
        
             
        
        
        
Represent the gravity of granite is 2.7
        
                    
             
        
        
        
Burning, cooking
Explanation:
Chemical changes that happens in school are: 
 Cooking of meals
  Burning of wastes
  Chemical reactions in laboratories
Rusting of iron used in construction
- A chemical change is a change that produces new kinds of substances. 
- These changes are usually accompanied by energy and mass changes. 
- Most of such changes are not reversible. 
Chemical changes are driven by change in chemical properties of matter. 
In a school, iron components might begin to rust. This is a chemical change. 
learn more: 
Chemical change brainly.com/question/9388643
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