Category: physical chemistry

Warming ice, melting ice, and cooling water

Tutoring chemistry, heat flow between hot and cold substances might be studied. The tutor mentions a reflection about water and ice. Today, while thawing chicken breasts in water, I wondered how much water would be needed to supply the necessary

Physical chemistry: vapor pressure: why a car may be harder to start in the winter

The tutor implicates the Clausius-Clapeyron equation to explain why combustion is more difficult at lower temperatures. To burn, a fuel must evaporate.1 In colder temperatures, fuel has less tendency to evaporate. For two specific temperatures (T1 and T2), the Clausius-Clapeyron

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Chemistry: Amonton’s Law

The tutor introduces an interesting law from chemistry. Amonton’s Law states that the pressure of a gas is directly related to its absolute temperature: P=kT, where k is some constant. Amonton’s Law needs the conditions of constant moles of gas

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Chemistry, thermodynamics: temperature increase caused by compression, continued

The tutor looks more specifically into the effect of compression on gas temperature. In my January 20 post I began about thermodynamics and the effect of compressing a gas. Today, I’ll give more specific coverage. The temperature rise a gas

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Chemistry: diffuse vs effuse

The tutor offers definitions of diffuse and effuse, two related terms from chemistry. To diffuse is to spread out, while to effuse is to escape. A gas will diffuse through the atmosphere, while it will effuse through a hole in

Physical chemistry: efficiency of internal combustion engine in hot vs cold weather

The tutor examines the idea that internal combustion engines are more efficient in cold weather. An upper limit for efficiency of an internal combustion engine is eff = (Tcombust – Tsurrounding)/Tcombust where Tcombust is the temp of the combustion cylinder

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Chemistry: what is a state function?

The tutor defines the term state function. A state function is one that is independent of path. Another way of explaining it: for a state function, if you end up where you started, nothing has changed. An example of a

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