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svetoff [14.1K]

3 years ago

14

When a chemical reaction takes in energy it might feel cold hot boiling electric

1 answer:

padilas [110]3 years ago

7 0

Answer: hot

Explanation:

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and the system will be cold and surroundings will be hot.

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and the system will be hot and surroundings will be cold.

As heat is absorbed, the reaction is endothermic and the system will feel hot.

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How much heat is required to change 100 g of ice (H2O) at 253 K to vapor (steam) at 393 K?

soldier1979 [14.2K]

<u>Answer:</u> The heat required will be 58.604 kJ.

<u>Explanation: </u>

To calculate the amount of heat required, we use the formula:

$Q= m\times c\times \Delta T$

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c = heat capacity of water = 4.186 J/g ° C

Putting values in above equation, we get:

$\Delta T={\text{Change in temperature}}=(393-253)K=140K=140^oC$

$Q=100g\times 4.186J/g^oC\times 140^oC$

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