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2 years ago

Which sample is most likely to undergo the smallest change in temperature upon the absorption of 100 kJkJ of heat

Chemistry

1 answer:

lapo4ka [179]2 years ago

4 0

Answer:

Corresponde a la sesi�n de GA 4.5 UN PEQUE�O AUMENTO

La dilataci�n se define como el aumento de las dimensiones de un cuerpo cuando �ste absorbe calor. A excepci�n del agua, que se contrae cuando su temperatura aumenta de 0 hasta 4 �C. Cuando un cuerpo absorbe calor, sus mol�culas adquieren mayor energ�a cin�tica y ocupa mayor espacio; en consecuencia, el cuerpo aumenta sus dimensiones, el espacio que se da entre las mol�culas es conocido como coeficiente de dilataci�n y para cada material es diferente.

De los estados de la materia el s�lido es el que se dilata menos en comparaci�n con los fluidos, de los cuales el gas se dilata notablemente.

La dilataci�n se considera, de manera general, de tres tipos: lineal, superficial y c�bica.

Dilataci�n lineal

Este tipo de dilataci�n se presenta en cuerpos cuya dimensi�n principal es su longitud y es indispensable considerarla en cables, v�as de ferrocarril o varillas; se calcula por medio de un instrumento llamado pir�metro de cuadrante.

Graphics

Cuando dos varillas de diferente material son calentadas de 25 �C a 68 �C se observa que las dos aumentan su tama�o, pero no en la misma proporci�n. El incremento de tama�o de cada varilla, cuando su temperatura se eleva un grado celsius, se conoce como coeficiente de dilataci�n y se define como el aumento que experimenta un cuerpo por cada grado cent�grado que su temperatura aumente.

La dilataci�n lineal que experimenta un cuerpo cuando se calienta depende b�sicamente de tres factores, que son:

a) longitud inicial Graphics

b) incremento de temperatura Graphics

c) coeficiente de dilataci�n Graphics

La relaci�n matem�tica de estos tres factores establece la igualdad:

Graphics

Ejemplo:

�En cu�nto aumentar� su longitud un alambre de cobre cuya longitud inicial es de 100 m, si la temperatura var�a de -15 �C a 32 �C? El coeficiente de dilataci�n del cobre es de Graphics

Explanation:

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