You get a can of soda from the vending machine and your “friend” maliciously shakes it when you’re not looking. You open the can
of soda and it fizzes all over your desk, making you regret you had brought it to lab in the first place. Is this a chemical change or a physical change? Explain your answer.
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.
Example: Melting of ice
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Corrosion of iron
It is given that the soda can fizzes when it is opened, which means the gas which has been dissolved in soda under high pressures now comes out of the soda due to low pressure. Thus as there is no chemical reaction involved here, this is a physical change.
The information that the coefficients of a balanced equation give about the reactants are to tell how many moles of reactants are needed and how many moles of product can be produced.
