SSC MTS EXAM

SSC

CHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is NOT an example of a chemical reaction?
A
Wood Burning
B
A cake baking in an oven
C
Melting Ice Cream
D
Mixing Vinegar and Baking Soda
Explanation: 

Detailed explanation-1: -The correct answer is Freezing of water. Freezing is a phase transition where a liquid turns into a solid when its temperature is lowered below its freezing point. Freezing of water is not a chemical change as ice when melt changes back to water showing the physical change.

Detailed explanation-2: -The ice pulls the heat away from the ice cream to melt which allows the ice cream to freeze. This is an example of an exothermic reaction . An exothermic reaction is a chemical reaction that releases light or heat, otherwise known as energy .

Detailed explanation-3: -Yes, the melting of ice cream is a physical change because here only change in physical state is taking place that is from solid to liquid and if we want again a solid ice cream we can freeze it.

There is 1 question to complete.