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matrenka [14]
3 years ago
10

The flamability (burns) is a physical change ?

Chemistry
2 answers:
kaheart [24]3 years ago
7 0
Nah not much of a physical change
NikAS [45]3 years ago
5 0

Flammability is a chemical change because when you burn something, it no longer has the same properties.

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Why are the optimum conditions for the Haber process a temperature of 450°C and pressure of 200 atmospheres?
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Answer:

See explanation.

Explanation:

Hello,

Haber process is defined as the widely acknowledged productive process of ammonia by the reaction:

N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)

Which is carried out in gaseous phase. Thus, by means of the Le Chatelier's principle, it is possible to know that its standard enthalpy of reaction is -45.90 kJ/mol (NIST webbook) for which it is an exothermic chemical reaction, for that reason less ammonia will be produced at high temperature, nonetheless, the temperature should not be too low since the reaction rate significantly decrease, therefore, the optimum found temperature is 450 °C.

Moreover, since there are more moles (3+1=4) at the reactants and less moles at the products (2), increasing the pressure of the reaction increases the yield of ammonia, nonetheless, higher pressures involve the purchasing of more expensive equipment to withstand the high-pressures, for that reason, the best found pressure has been set as 200 atm.

Best regards.

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