Heat is transmitted to the surroundings as follows: molecules collide with the glass, and the glass molecules then transmit that energy to the outside.
Heat energy is lost when molecules collide in a chemical reaction.
According to this question, a reaction is occuring in a test tube. The reaction involves a collision of molecules that results in the loss of heat energy.
This energy is transmitted to the surroundings as follows when molecules collide with the glass, and the glass molecules then transmit that energy to the outside.
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