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            | Topic: | Science | 
        
            | Number of pages / Number of words: | 5 / 1378 | 
                
    
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The chips are then added and the bung is quickly placed over the flask to create an airtight seal. The amount of carbon dioxide in the gas syringe is read off every 10 seconds until the reaction stops or the gas syringe runs out of capacity (100ml).
Risk Assessment
Goggles must be worn at all times to prevent acid going in eyes...
        
        
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2 repeats for each size of marble chip Gas syringe and digital stopwatch
Independant Variable
Size of marble chips Powder, small, medium and large chips prepared by teacher. 2g used each time. Size measured by third party. Weighed using digital scales.
Control Variables
Amount of acid 10ml each time Measuring Cylinder
Concentration of acid 1 molar acid Measured by third party...
        
        
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                                    Reaction rates of marble chips
                            
                    
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