During an experiment water was heated in a container covered with a glass lid. The following observations were recorded.

Chemistry

1 answer:

Papessa [141]2 years ago

8 0

Based on the observation, the type of change which took place in this scenario is a physical change.

<h3>What is a Physical change?</h3>

This is the process in which several reactions don't alter the chemical composition of substance.There may be however changes in its form or phase such as the conversion of water to vapor which moves from the liquid phase to the gas phase.

In the experiment, we observed the formation of bubbles which means boiling of the water droplets took place hence the presence of vapor as a result of the elastic collision of the molecules which resulted in its formation.

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The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is -5,074 kJ/mol. This value is the Delta. Hrxn f

Inessa [10]

Combustion can be defined as the reaction of a compound with oxygen. The enthalpy of combustion of octane is $\Delta H_{\rm rxn}$ for $\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$ .

<h3>What is the enthalpy of reaction?</h3>

The enthalpy of reaction is the amount of heat energy absorbed or lost by the molecules in the chemical reaction.

The enthalpy of combustion is the amount of heat energy released by the compound in the reaction with oxygen.

The reaction in which heat is liberated with the reaction of a compound with oxygen has an enthalpy of combustion, equivalent to the enthalpy of reaction.

The combustion of octane can be given as:

$\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$

Thus, the reaction has combustion energy equivalent to the enthalpy of the reaction is $\rm C_8H_{18}\;+\;25\;O_2\;\rightarrow 8\;CO_2\;+\;9\;H_2O$ . Thus, option B is correct.

Learn more about enthalpy of reaction, here:

brainly.com/question/1657608

6 0

2 years ago

I NEED HELP ASAPPPPPPPPPPPPPPPP

RoseWind [281]

Answer:

i wold think it is C

Explanation:

8 0

2 years ago

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