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Hess's law states that the total enthalpy change for a chemical reaction is the sum of the enthalpy changes for individual steps, regardless of the pathway taken. To measure the enthalpy of a desired reaction, one can combine known enthalpy changes from related reactions, manipulating them as necessary (e.g., reversing reactions or adjusting coefficients) to match the desired reaction. By applying Hess's law, the overall enthalpy change for the target reaction can be calculated using the enthalpy values of these referenced reactions. This approach is particularly useful when direct measurement of the enthalpy change is challenging or impossible.
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How are hesss and wegneners theory relate?
Hess's and Wegener's theories are interconnected in their exploration of continental movement and plate tectonics. Alfred Wegener proposed the theory of continental drift, suggesting that continents were once joined and have since moved apart. Harry Hess later contributed to this understanding with his theory of seafloor spreading, which explained how new oceanic crust forms at mid-ocean ridges and pushes continents apart. Together, their ideas laid the foundation for the modern understanding of plate tectonics.
Which was not included in the support for Harry Hesss hypothesis of sea-floor spreading?
One key piece of evidence not included in support of Harry Hess's hypothesis of sea-floor spreading was the discovery of paleomagnetic data. While Hess's theory focused on the creation of new oceanic crust at mid-ocean ridges and the recycling of crust at subduction zones, the paleomagnetic records provided insights into the historical movement of continents and the magnetic orientation of rocks, which later supported the theory of plate tectonics. Other evidence, such as the age of oceanic crust and the distribution of fossils, played a more direct role in supporting his hypothesis.
