# Questions tagged [heat]

For questions about heat - a form of transfer of energy from one body to another or from one body to its surroundings. Also see these tags: [thermodynamics], [enthalpy], [energy], [temperature].

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### Is there water coloring that will maintain color at 80°C?

I'm building a keg cleaner for my employer. The cleaner has a caustic tank that uses PBW, and a sanitizer tank. The current build is plagued with caustic contamination, so I would like to see ...
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1 vote
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### Theoretical justification for the definition of standard enthalpy of reaction

I've been reading the book Chemistry: Core Concepts by Allan Blackman, Daniel Southam, Gwendolyn Lawrie, Natalie Williamson, Christopher Thompson and Adam Bridgeman. They give the following definition ...
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### Calculating the heat of reaction between sulfuric acid and sodium hydroxide

For my lab report I have to calculate the theoretical heat of reaction $\Delta H_{\text{rxn}}$ between sulfuric acid $\ce{H2SO4}$ and sodium hydroxide $\ce{NaOH}$ using their heat of formations. The ...
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### Two different approaches for calculating enthalpy change for methane + HCl

I know that $\Delta{H}=H_{products}-H_{reactants}$ and also we can use $\Delta{H}=\Sigma{H}_{bonds broken}-\Sigma{H}_{bonds formed}$. Take the example of methane + HCl. If you calculate the total ...
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### Why are internal energy and work mentioned in a question about exothermic or endothermic systems? [closed]

This is a question from my chemistry homework. Note the explanation below. A 100.0-g bar of gold is heated from 25°C to 50°C during which it absorbs 322 J of heat. The volume of the gold bar remains ...
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### Weird jumps in DSC measurements between scans

I have multiple DSC measurements with multiple up- and down-scans and some of the time, seemingly at random, the inflection points will show massive jumps in the heat flow. I have no idea where they ...
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### Heating a Single Water Molecule [closed]

From my understanding, phase changes break/form bonds between molecules of the same substance. Assuming this is in a vessel at 1atm of inert gas, if I have one molecule of water with no bonds to other ...
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### Chemistry Thermodynamics and Sign Convention [closed]

Can anyone pls explain me the sign conventions that we use in chemistry thermodynamics for heat and work...also kindly explain how to identify what will happen to heat in positive or negative work and ...
1 vote
68 views

### How can the heat equation be used to model temperature vs time in a solubility experiment?

Background: I am doing experiments trying to map the practical solubility of a certain chemical species called an "activator" solution. This solution is essentially a sequential mixture of ...
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### Intuitive explanation for enthalpy of hydration

In my chemistry course, we were discussing types of enthalpy and the enthalpy of hydration came up. My instructor defined this as heat associated with adding water to an anhydrous salt. However, I ...
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1 vote
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### How does carbon dioxide in the atmosphere keep heat trapped?

In the classic description of how greenhouses gases are increasing the temperature of Earth's surface, shorter wavelengths of light like visible and ultraviolet (UV) penetrate the atmosphere, hit the ...
106 views

### Is there any transparent see material that can endure temperatures of 2000 °C?

I was wondering if there is a transparent material that can endure temperatures up to 2000 °C without deforming or degrading. This material doesn't have to be glass, it can be plastic or a weirdly ...
4k views

### How do you calculate the heat capacity ratio for a multi-compound gas?

Let's say I have a heat capacity ratio of 1.4 N2 and a heat capacity ratio of 1.2 for O2 (just random placeholder values no significance), and I wanted to calculate the heat capacity ratio of their ...
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### How would one calculate the Heat Capacity Ratio for a multiple compound Gas?

So I'm attempting to calculate the heat capacity ratio (known also as adiabatic index) of a gas with several concentrations of different compounds such as N2, H2O, CO2, CH4 etc. And while I have an ...
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620 views

### Is there a heat-based alternative to photosynthesis?

I can imagine one main disadvantage of a process using sunlight to metabolize sugars would be that wherever there is little/no sun (nighttime), plants don't grow. Heat is more abundant than sunlight ...
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### What does it mean when we say an atom has infinite energy levels/shells? [closed]

My chemistry teacher told that an atom has infinite energy shells according to Bohr model , where electron reside according to its angular momentum and energy. But in lower classes/ grades I have ...