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kolbaska11 [484]
4 years ago
15

Explain how you can tell when a change is a chemical change.

Chemistry
1 answer:
elena-14-01-66 [18.8K]4 years ago
3 0
When the object has something added to it 
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What are the standard temperature and pressure conditions enthalpy is usually measured under?
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The standard temperature and pressure conditions enthalpy is usually measured under are 1kPa and 273K (option A).

<h3>What is enthalpy?</h3>

Enthalpy in thermodynamics is a measure of the heat content of a chemical or physical system.

Enthalpy is the sum of the internal energy and pressure times volume It can be calculated using the following formula:

H = E + P V

Where;

H = Enthalpy

E = internal energy

P = pressure

V = volume

However, the enthalpy of a substance is usually measured under standard temperature and pressure.

  • The standard temperature is 273 Kelvin or K
  • The standard pressure is 1kPa

Learn more about enthalpy at: brainly.com/question/13996238

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inessss [21]
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