Question 7
Can mechanical waves travel from the Sun to Earth? Explain your answer.
•No because the distance is too far.
•Yes because mechanical waves can travel through anything.
•No because mechanical waves must have a medium to travel through.
•Yes because light waves are mechanical waves.

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answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.