A spontaneous reaction is one that favors the creation of products under the reaction's current conditions.
What is spontaneous reaction?
A spontaneous reaction is exergonic and has a negative delta G. The system's enthalpy, or total energy, must decrease and its entropy, or disorder, must rise for a chemical reaction to occur with a net release of free energy (- delta G). The energy needed for cellular function comes from spontaneous reactions.
What is importance of spontaneous reactions in the metabolism of a cell?
- Chemical reactions take place in steps to produce and break down complex molecules as part of cellular activities.
- While some of these chemical processes take energy to complete, others happen spontaneously and release energy.
- Cells must continuously produce additional energy to replace the energy spent by the numerous energy-intensive chemical reactions that take place all the time, just as living beings must continuously consume food to replenish their energy stores.
- The term "cell metabolism" refers to all of the chemical processes that occur within of cells, including those that use or produce energy.
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The rock cycle is a cycle that rocks go through which involves melting, cooling, pressure, erosion, and other stages. Starting with a volcanic eruption, the lava turns into igneous rock, that can be melted into magma again, or can be crushed and pressed into other rocks beneath the crust to form metamorphic rock, or can be broken down by erosion and other factors. For the sake of it, let's say the rock got broken down, it turns into sediment that collects in areas and get layered and pressed, and layered, and pressed some more into a sedimentary rock. That rock can be broken down again, or melted, or pressed with heat and pressure. But let's say it went under the crust with other rocks, mixed with heat, pressure, and other types of rock to become metamorphic rock. Now let's say that metamorphic rock found it's way to a volcano, got melted, and erupted, and cooled to get back to a igneous rock. And the cycle never ends.
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