Question

Label the following processes as exothermic or endothermic: a) ice melting: H20 --> H2O water freezing: H,0 -->H,0 b)_ When CaCl, dissolves in water, the temperature of the water rises. d) When NH NO, dissolves in water, the temperature of the water decreases.

Answer 1

Here is the Solution:

Endothermic : is the entering to by a substance. greater than zero. a substance or gained That means heat (AH) is Torso Exothermic : is the heat exiting a substance or heat loss by the substance. That means (OH) heat is less than zero. AH2O @ Ile melting : H₂O B) H₂O (2) Endothermic Because the solid ice gained heat - and becomes liquid. AHO, 6. Water freezing : H2O2 a H₂O (8) Exothermic Because the liquid water loses heat and becomes solid. SHKO. . When cacla dissolves in water, the temperature of the water rises. Endothermic. The process is endothermic because water gained heat. DHZO .. & when NHA NO3 dissolves in water, the temperature of the water decreases - Exothermic. The process is exothermic because, water loses heat. DHKO.

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