Types of fossil fuels include:

hydrogen
oil
carbon dioxide
wind
coal
natural gas
ammonia

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a polar bond is formed when electrons are shared unevenly between atoms

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

i'm wiling to try and you : )