Can anyone help me out on these questions? Determine whather cach process is mdo

Question

Can anyone help me out on these questions?

Determine whather cach process is mdothermic or esobermic. Explin brfy b) Water vapor condenses ino deelets (c) jA beloon slrisks wen it h pcad in a freezer [d) iA solde (rNaC ineretes ia tertperuue when it is heated by a Busen butet. . Calpate he ceergy reqpired for a 25.0 g piece of kad to be heated from 40'C to 95'c C,-0 0308 calgC) 3. The specific heal of capper teal is 0.3KS Jg.cc. Mas of a pre-1962 perny is 3.1 grams roquirad to heal a penny from rootn teasperssure (200 Cjo l00rC? How much heat B

Explanation / Answer

Endothermic reaction/processes are those in which heat is given out.

Exothermic reaction/processes are those in which heat is absorbed

1 (a) Combustion is a process in which any substances reacts with oxygen in air and gives out heat, therefore combustion of propane is also a exothermic process.

(b) The process of conversion of water vapour into water is known as condensation and condensation is a exothermic process. Water vapours comes into contact with cooler molecules in atmosphere and loose their energy and condenses.

(c) This process is also exothermic because the gas molecules in balloon loses their kinetic energy due to low temperature.

(d) This process is endothermic in nature, NaCl solution gains energy from the bunsen burner and therefore its temperature increases.

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