How does the potential-energy diagram for a reaction indicate whether the reaction is endothermic or exothermic? an endothermic reaction has reactants that are lower in energy than products because energy is absorbed to form the products. an endothermic reaction has reactants that are higher in energy than products because energy is released to form the products. an exothermic reaction has reactants that are lower in energy than products because energy is released to form the products. an exothermic reaction has reactants that are higher in energy than products because energy is absorbed to form the products.

The right answer is A.

An endothermic reaction is a transformation that absorbs energy. Indeed, it needs this energy input to break the bonds that exist in the reagents (which are stronger than in the products).

An exothermic reaction is a transformation that releases energy. Indeed, the bonds that exist in the reagents are weaker than those present in the products. Thus, a surplus of energy is released.

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]

a and c are the answeres