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Chapter 6: Problem 21

Why is it a good idea to rinse your thermos bottle with hot water before filling it with hot coffee?

Short Answer

Expert verified
Rinsing a thermos bottle with hot water before filling it with hot coffee is a good idea because it preheats the walls of the bottle, making them closer to the temperature of the coffee. This reduces the initial heat transfer between the coffee and the inner layer of the bottle, minimizing heat loss and ensuring the coffee stays hot for a longer period.

Step by step solution

01

Understanding the Properties of a Thermos Bottle

A thermos bottle is designed to minimize heat transfer between the contents and the external environment. Its walls consist of two layers separated by a vacuum, which reduces heat transfer through conduction and convection. The inner surface of the bottle is reflective, which minimizes heat transfer through radiation.
02

Understanding Heat Transfer in the Thermos Bottle

When you pour hot coffee into a thermos bottle, the heat transfer process between the coffee and the walls of the bottle begins. The coffee starts transferring heat to the inner layer of the thermos bottle via conduction. As the walls of the bottle get warmer, the coffee loses heat and cools down. The purpose of the vacuum layer and reflective surface is to minimize this heat loss and keep the coffee hot for a longer time.
03

The Purpose of Rinsing the Thermos Bottle with Hot Water

Rinsing the thermos bottle with hot water before filling it with coffee preheats the walls of the bottle, making them nearer to the temperature of the hot coffee you are going to pour. This reduces the initial heat transfer between the coffee and the inner layer of the bottle, meaning that less heat will be lost in the process and the coffee will stay hot for a longer period.
04

Applying the Concept to Real-Life Scenario

To better understand the significance of preheating the thermos bottle, think of it like this: if you poured hot coffee into a cold bottle, the coffee would immediately lose a significant amount of heat, as it would need to heat up the bottle's walls first. By preheating the bottle with hot water, you bring it closer to the desired temperature and limit the initial heat loss, preserving the temperature of the coffee for a longer duration.

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Most popular questions from this chapter

Which of the following substances have an enthalpy of formation equal to zero? a. \(\mathrm{Cl}_{2}(g)\) b. \(\mathrm{H}_{2}(g)\) c. \(\mathrm{N}_{2}(l)\) d. \(\mathrm{Cl}(g)\)

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is \(40 . \mathrm{cm}^{3}\). If the combustion of this mixture releases 950. J of energy, to what volume will the gases expand against a constant pressure of 650 . torr if all the energy of combustion is converted into work to push back the piston?

A piston performs work of \(210 . \mathrm{L} \cdot \mathrm{atm}\) on the surroundings, while the cylinder in which it is placed expands from \(10 . \mathrm{L}\) to \(25 \mathrm{~L}\). At the same time, \(45 \mathrm{~J}\) of heat is transferred from the surroundings to the system. Against what pressure was the piston working?

On Easter Sunday, April 3,1983, nitric acid spilled from a tank car near downtown Denver, Colorado. The spill was neutralized with sodium carbonate: \(2 \mathrm{HNO}_{3}(a q)+\mathrm{Na}_{2} \mathrm{CO}_{3}(s) \longrightarrow 2 \mathrm{NaNO}_{3}(a q)+\mathrm{H}_{2} \mathrm{O}(l)+\mathrm{CO}_{2}(g)\) a. Calculate \(\Delta H^{\circ}\) for this reaction. Approximately \(2.0 \times\) \(10^{4}\) gal nitric acid was spilled. Assume that the acid was an aqueous solution containing \(70.0 \% \mathrm{HNO}_{3}\) by mass with a density of \(1.42 \mathrm{~g} / \mathrm{cm}^{3} .\) What mass of sodium carbonate was required for complete neutralization of the spill, and what quantity of heat was evolved? ( \(\Delta H_{\mathrm{f}}^{\circ}\) for \(\left.\mathrm{NaNO}_{3}(a q)=-467 \mathrm{~kJ} / \mathrm{mol}\right)\) b. According to The Denver Post for April 4,1983 , authorities feared that dangerous air pollution might occur during the neutralization. Considering the magnitude of \(\Delta H^{\circ}\), what was their major concern?

Given the following data $$ \begin{aligned} 2 \mathrm{O}_{3}(g) & \longrightarrow 3 \mathrm{O}_{2}(g) & \Delta H &=-427 \mathrm{~kJ} \\ \mathrm{O}_{2}(g) & \longrightarrow 2 \mathrm{O}(g) & \Delta H &=495 \mathrm{~kJ} \\ \mathrm{NO}(g)+\mathrm{O}_{3}(g) & \longrightarrow \mathrm{NO}_{2}(g)+\mathrm{O}_{2}(g) & \Delta H=-199 \mathrm{~kJ} \end{aligned} $$ calculate \(\Delta H\) for the reaction $$ \mathrm{NO}(g)+\mathrm{O}(g) \longrightarrow \mathrm{NO}_{2}(g) $$
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