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GREYUIT [131]
3 years ago
15

Evaluate the Statement: "There is no such thing as 'cold'just the absence of heat", is it true? Why or why not?

Chemistry
1 answer:
allochka39001 [22]3 years ago
3 0
Due to thermodynamics, heat has higher energy particles and colder temperatures have lower energy particles. Heat is always transferred to lower temperatures. Energy can transfer as heat, not cold. For example, when you put ice cubes in room temperature water, the water transfers energy as heat to the ice cubes, making the cubes warmer. The two temperatures come into equilibrium. And if the water is cold, there is an absence of heat.
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answer

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4 0
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Read 2 more answers
At a certain temperature, Kc = 0.0500 and ∆H = +39.0 kJ for the reaction below, 2 MgCl2(s) + O2(g) → 2MgO(s) + Cl2(g) Calculate
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Explanation:

Since, it is shown that the reaction has been reversed. Therefore, value of K_{c} will become \frac{1}{K_{c}}.

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Also, the number of moles of each reactant has been halved. So, K_{c''} for the reaction MgO(s) + \frac{1}{2}Cl2(g) → MgCl_{2}(s) + \frac{1}{2} O2(g) will also get halved.

Therefore,     K_{c''}  = K_{c'} = (20)^{0.5}

                               = 4.47

As the value of \Delta H is given as +39.0 kJ. So, it means that the reaction is endothermic in nature. So, energy of reactants will be more than the products. Hence, according to Le Chatelier's principle reaction will move in the forward direction.

As a result, K_{c} will also increase with increase in temperature.

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hen the number of neutrons is known and the atomic number of an element is known, it becomes easier to determine the approximate mass number by adding the two.

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