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Questions in chemistry

[Done] How do you find the oxidation number of an element?

[Done] The scientist found that 2 grams of hydrogen reacted completely with 16 grams of oxygen. What was the total mass of the water produced?

[Done] Methane is a gas that helps trap the sun's energy within the Earth's atmosphere and is known as a: A. Greenhouse gas B. Ozone gas C. Unnatural gas D. Gas produced by plants

[Done] Which solution has the largest concentration of ions?

[Done] What element is a white, shiny, metallic solid, reacts slightly to air, and has a density of 1.55?

[Done] What parts of the atom are exchanged in chemical reactions?

[Done] Which condition of ocean water varies with the location and seasons?

[Done] Why is the surface of sodium only shiny when it is freshly cut?

[Done] What is the hybridization of Carbon in [tex]CTe_2[/tex], Selenium in [tex]SeF_3^+[/tex], and Sulfur in [tex]HSO_3^-[/tex]? Hint: Consider the number of electron pairs around the central atom to determine the hybridization.

[Done] What body systems work together to provide cells with the nutrients needed for cellular respiration?