When vinegar is mixed with bicarbonate of soda, gas is produced. After five minutes, another product can be observed. What is this additional product and how does it provide evidence of a chemical reaction?
1 )
More gas, showing that the reaction continues over time
A solid residue, showing that new substances with different properties have formed
3 )
A color change, showing that energy has been released
4 )
A temperature increase, showing that the reaction is exothermic
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