Map Sapling Learning Which of the following statements are true? AH for an endot

Question

Map Sapling Learning Which of the following statements are true? AH for an endothermic reaction is positive for an exothermic reaction is positive When energy is transferred as heatfromthe system tothe surroundings, AHis negative. when energy is transferred as heat from the surroundings tothe system, His negative. O The evaporation of water is an exothermic process. A combustion reaction is exothermic. Previous Give up s view Souton Check Answer eNext Ext about us l careers partners privacy policy terms of use contact us help

Explanation / Answer

1) true;
the endothermic process describes a process or reaction in which the system absorbs energy from its surroundings.
SO, the enthalpy change has a positive value; H > 0

2)false;
An exothermic reaction is a chemical or physical reaction that releases heat.
So, the enthalpy change has a negative value:    H < 0

3) true;
When energy is transferred as heat from the system to the surroundings, H < 0 (exothermic reaction)

4) false;
when energy is transferred as heat from the surroundings to the system, H > 0 (endothermic)

5)false.
Evaporation is endothermic because water molecules must absorb heat from the surroundings to increase their kinetic energy.

6) true.

A combustion reaction is exothermic. This is true because in combustion reaction heat released, so it is exothermic.

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