Answer:
how many it is you should give only one question
I think it might be A. Supergiants.
Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element, including its size and its electronic properties. Major periodic trends include: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character. Periodic trends, arising from the arrangement of the periodic table, provide chemists with an invaluable tool to quickly predict an element's properties. These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements.
Combustion
Explanation:
This reaction is called a combustion reaction. It is very peculiar to reactions involving hydrocarbons.
In such reactants, oxygen gas is used as a reactant. It combines with fuel usually the hydrocarbon to produce heat and light energy.
For the combustion of most hydrocarbons, water and carbon dioxides are usually the product.
2CH₂ + 3O₂ → 2CO₂ + 2 H₂O
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Combustion brainly.com/question/11089002
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True, Petroleum is used to make synthetic plastics and numerous petrochemical.
