Questions tagged [temperature]

A measure of the average kinetic energy of the particles in a sample of matter; may be expressed either in kelvin (symbol K) or in degree Celsius (symbol °C).

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Does pressure affect homolysis?

I would like to know what is better for homolytic fissisng and why. A) high temperature and high pressure B) high temperature and low pressure I think that B is the solutiot, because before the ...
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Does pressure x volume = kinetic energy?

Sorry don't know if this is more for physics or here, essentially I had a question on the root mean square velocity of gas particles equation and didn't know what it was so tried to work something ...
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Why ice gets stuck on our hands but cold wood doesn't? [closed]

Is that caused by sweat? Kinda confused.
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Quasi Static Process and Reversibility of Engines

So I understand that In a quasi static process, the temperature of the system is changed ever so slightly and slowly until it reaches its final temperature,so that at each stage of temperature change, ...
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Do external actions affect critical temperature?

Critical temperature $T_\mathrm{c}$ is the temperature when properties of both gas and liquid converge to the same values and the difference between the phases disappear: $$T_\mathrm{c} = \frac{8a}{...
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pKw, pKb, pKa and NEN6411

I am trying to understand how to account for pH-temperature relations during industrial pH measurements. Do I have it right?: The impact temperature has on the pKa of strong acids are in practical ...
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Finding Gibbs energy at different temperatures just given Gibbs energy at one temperature

How would it be found the Gibbs energy at a certain temperature, if they just give you another Gibbs energy at a temperature? For example: Given $\Delta G = -230 Kcal/mol$ at $773K$ for the reaction $...
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Temperature effects on pKa and pKw

I am an industrial electrician apprentice who needs to learn more about pH-measurements and how the temperature effects the measurement itself (I am in charge of all the pH measurements on the ...
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688 views

What would oxygen or nitrogen snow look like?

I was watching a video of what would happen if the earth got kicked out of the solar system and at one point it was mentioned that oxygen and nitrogen snow would form. So would such snow be any ...
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Will there be a temp change in free expansion [closed]

I did a little thought experiment, where I place an infinitely long beaker filled with some gas, which has a moveable piston at the open part. So if I place this beaker in vaccume, there will ...
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3answers
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What is the difference between fire and warm body? [closed]

A burning body has flames (Candle flame)whereas a hot or warm body (warm utensil or body being hot but doesn’t burn )is just very hot. Keeping hand near a burning body makes you feel hot but not ...
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How to resolve Amine Blush problems of a Epoxy curing Agent without having to change the temperature and moisture of the air?

The formation of Carbamate as a result of the reaction between amine groups of curing agents and H2O/ CO2 leaves the surface of the cured epoxy with some blurry lines and dots. the typical solutions ...
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What is the fundamental difference between temperature and energy? [duplicate]

We know that temperature is proportional to the average kinetic energy of a system. We also know that temperature is not the same as energy because the temperature is intensive while the temperature ...
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The formation of ice crystals on/in frozen food that has been defrosted and then frozen again

I made a mistake. I put my ice cream in the refrigerator instead of the freezer and left it there for a night. I realized my folly the next day. I put it in the freezer. When I took it out, I noticed ...
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Why are some liquids hotter than room temperature gases if liquid and solid molecules move more slowly than gases? [closed]

We learned in school that state change is a matter of molecules moving faster and faster. And we learned "heat em up, speed em up, spread em out". Why then can some liquids have higher ...
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pH scale at various temperatures

I am an electrician apprentice in charge of a large number of pH-sensors/transmitters at a power plant and chemical plant. I do all the pH-instrumentation related maintenance, calibration, adjustments ...
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1answer
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Why does activation energy depend on temperature? [duplicate]

To me it makes sense that the activation energy $E_\mathrm a$, as given by the Arrhenius equation, doesn't depend on the temperature as the needed energy (potential energy) to start a reaction has ...
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How would one determine the temperature needed such that hydrogen peroxide will start to decompose? [closed]

Hydrogen peroxide decomposes at room temperature and so I was wondering what temperature is sufficient for this decomposition to occur. Can someone explain how we can determine this? (theoretically or ...
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Brittleness of Ice?

I am curious as that I know that various materials can be subjected to fragility from ductile-brittle transition via temperature, where an item is more likely to fracture of shatter such as increase ...
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Thermochemistry: On Units of Enthalpy Change and Implicit Given of Initial Temperature of Calorimeter

I would like to ask two separate questions. But first, so that we are on the same page, the experiment used a constant-pressure calorimeter, and it is a neutralization reaction of 1M of HCl and 1M of ...
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Formulations for wax thermostatic element for effect in alternative temperature range

Wax thermostatic elements are used automobile cooling systems and anti-scald mixing valves to control flow rates or to adjust mixing of flow inputs. These devices operate on the principle of thermal ...
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Does fractionation use enough heat to destroy nutrients in Coconut Oils when seperating the MCT oils?

We have recently been giving MCT (medium-chain triglyceride) oil to our dogs in place of Coconut Oil as from what I understand the majority of the benefits of Coconut Oil comes from the MCT's ...
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How or Why does diesel/kerosene have a much higher 'flash point' but lower auto/self-ignition point than gasoline/petrol?

This is a very common question, but I have yet to find a good theoretical answer to both questions (diesel has higher flash point BUT lower spontaneous ignition temp.)
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Why Does Activation Energy not change with Temperature change

As The Graph Shows; $E_a$ (Activation Energy) = Energy Of transition State(Threshold Energy) $-$ Energy of Reactants. So let This be the graph at Temperature $T_1$, Now say We Increase The Temperature ...
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How can we say that Helium (He) is liquid at “absolute zero”?

According to Wikipedia, Helium can never be solidified at $\pu{1 atm}$ ($\pu{101325 Pa}$) pressure, not even at absolute zero. A minimum of $\pu{25 atm}$ pressure is required to make Helium solid. But ...
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Internal energy for Phase Transitions

Can we justify that "For sublimation of a solid at 1 atm $\Delta U>0$ at low temperature and $\Delta U<0$ at high temperature?" I read several answers and came to know that $U=f(T)$ ...
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Misconception of gas laws [closed]

I face a misconception with gas laws: Boyle’s law, Charles’ law, and Gay-Lussac’s law. This is because each law of these assumes the constancy of one of the three following variables (the pressure, ...
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73 views

How does the polarizability of an apolar compound influence properties such as its boiling temperature? [closed]

I have understood that the more polar is a compound, the higher is its boiling temperature. But I would like to know what is the justification for this answer. I am new to chemistry so I would ...
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35 views

How to accelerate the evaporation of water at temperature below 5 °C? [closed]

How can we make the water to evaporate at low temperature? Does addition of high evaporating solvents help or decrease in the hydrogen bonding by addition of solute will help? Is there any other ...
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Temperature required for E1 elimination reaction

I wanted to ask what's the temperature required for carrying out elimination reactions? Wherever I read about elimination reactions, they just mention that elimination reactions occur at high ...
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112 views

How does pH depend on temperature, when taking into account volume expansion?

Since autodissociation of water is endothermic, increasing the temperature will drive the following equilibrium to the right, which has the effect of increasing $[\ce{H+}]$: $$\ce{H2O <=> H+ + ...
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Does motor oil get more viscous when heated & what is the meaning of the SAE motor oil code?

The motor oil in my 2004 Pontiac Vibe is 5W-30. My (incorrect) understanding of this SAE nomenclature is that 5W means "Viscosity index of 5 in the winter" (or when really cold - like $\pu{-30 ^\...
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Stability of Peroxynitric Acid in cold temperature

I have a question about the stability of Peroxynitric Acid i.e. $\ce{HO2NO2}$ at cold temperature. I know that it becomes stable when temperature decreases, but what is the specific reason for it? I ...
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How can temperature be constant during a reaction? [closed]

So I was reading my textbook about the topic thermodynamics. Here the second paragraph States that the above equation describes the combustion of liquid ethanol at constant temperature and pressure. ...
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Non-conducting substance with a glass transition temperature around 400 to 600 °C?

Am looking for a substance to seel two pieces of ceramic that will have molten plastics flowing between at 300+ °C however silver solder circuit traces inside the device prevent me from going much ...
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Will increasing temperature have an effect to the pH of honey to be able to carry out an acid-base titration? [closed]

After doing some research on how to decrease the viscosity of honey to undergo acid-base titration with NaOH, one of the ways was by increasing the temperature of honey but the problem is that the pH ...
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Adiabatic flame temperature of hydrogen peroxide calculation

I will first demonstrate my cursory method for evaluating the adiabatic flame temperature of H2O2 at atmospheric pressure. $$\ce{H2O2 -> H2O + 0.5O2}$$ At $\pu{1200 K}$, \begin{align} h_\ce{...
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Reaction rate and temperature [duplicate]

I recall being told that for a given reaction, every 10 degree rise in temperature the reaction rate approximately doubles. Is this true?
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118 views

What happens with the boiling point of a liquid in a vacuum [closed]

This may be a silly question, but when I was reading my chemistry textbook, there was this following statement: "A liquid boils when its vapor pressure equals the external pressure acting on the ...
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Is this example considered liquifying a gas under pressure?

In my work place, we have a drum that has propene inside at a pressure of around 2,5 bar and at a temperature of around -15ºc and the boil-off of that drum is aspirate by a compressor and is ...
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What exactly is temperature?

I've read at many places that temperature is the average kinetic energy of particles present in an object. I just don't intuitively get how kinetic energy is connected with temperature. And how is ...
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Understanding the use of Le Chatelier's principle in the industrial production of ammonia

I understand why the reaction $$\ce{N2 + 3 H2 -> 2 NH3} \qquad \Delta H = \pu{-92.2 kJ mol-1}$$ isn't carried out in the lowest possible temperature (even though it seems that it should be as it ...
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Endothermic reaction absorbs heat from environment

I read on my school book about chemistry the reaction: $$\ce{H2O + NH4Cl}$$ with $T(\ce{H2O}) = \pu{25 °C}.$ The temperature of the final solution is $\pu{20 °C}$. I know that it is an endothermic ...
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Does ice increase the humidity of its surroundings? [closed]

Does ice increase the humidity of its surroundings? I'm trying to use the BME280 for an Arduino project regarding locating ice, but I don't know whether the atmosphere is more humid around ice. I'm ...
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Are there reactions operated at high temperature at industrial level? [closed]

Temperature is an important parameter when you deal with a chemical reaction, first of all $\Delta G$ and $\Delta G^\circ$ depend on temperature, and as a consequence the spontaneity of a reaction ...
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What is the triple point pressure for Gallium?

I have seen various discussions about the triple point of Gallium determined to a very precise value, so precise that it is used as a reference for NIST scales and measurements. However, these ...
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Will heavy gases sink in a closed refrigerator?

Let's assume there is no air movement in the refrigerator. Is this enough for sinking of nitrogen? If not in what (low) temperatures we will start to see evident distinction between the composition of ...
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What happens to air at 1000 degrees Celsius [closed]

I was looking at the graphs for the density of air at different temperatures (link below) and I was wondering if air would not react with itself at high temperatures? I read that oxygen and nitrogen ...
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Preparation of Barium Hexaaluminate using co-precipitation reaction mechanism

I am preparing Barium Hexaaluminate (BHA) using $\ce{Ba(NO3)2, Al(NO3)3}$, and $\ce{(NH4)2CO3}$. For $\pu{1 mol}$ of each $\ce{Ba(NO3)2}$ and $\ce{Al(NO3)4}$, I am using $\pu{1.5 mol}$ of $\ce{(NH4)...
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Why is so different the temperatures of a compressed gas compared to a liquid/gas mixture of the same fluid and they are both at the same pressure?

Why does $\ce{C3H6}$ gas when compressed (in a centrifugal compressor) comes out with a pressure of $\pu{16 bar}$ and $\pu{90 °C},$ and when it is a mixture of $\ce{C3H6}$ liquid/gas stored inside of ...

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