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Questions in chemistry

[Terjawab] What is the meaning of the heat of combustion of ethanol?

[Terjawab] What happens to magnesium when it is oxidized to magnesium oxide (MgO)? A. It gains oxygen. B. It loses two protons. C. Its oxidation state decreases. D. Its oxidation state remains the same.

[Terjawab] Which organ systems benefit from the functions of the digestive system?

[Terjawab] What are the reactants in this chemical reaction? Ammonium nitrate reacts with sodium hydroxide to form gaseous ammonia, water, and sodium nitrate. A. $NH_3+H_2 O+NaNO_3$ B. $NH _4 NO _3+ NaNO _3$ C. $NH_4 NO_3+NaOH$ D. $NaOH+NH_3$

[Terjawab] What is phosphorescence? A. A material that absorbs lots of light B. A material that we C. A material that

[Terjawab] How many moles of copper (II) sulphate are present in the 100cm3 solution?

[Terjawab] What is the noble gas electron configuration for calcium, Ca? A. [Ar] 4s^2 3d^5 B. [Ar] 4s^2 3d^{10} C. [Ar] 4s^2 D. [Ar] 4s^2 3d^{10} 4p^3

[Terjawab] How did Moseley establish a more accurate periodic table? A. by arranging the elements according to atomic mass instead of atomic number B. by arranging the elements according to atomic number instead of atomic mass C. by arranging the elements into horizontal periods D. by arranging the elements into vertical groups

[Terjawab] What are the reactants in this chemical reaction? Silicon dioxide plus hydrofluoric acid produces silicon tetrafluoride and water. A. [tex]$SiO _2+ HF$[/tex] B. [tex]$SiF _4+ SiO _2$[/tex] C. [tex]$HF + H _2 O$[/tex] D. [tex]$SiF _4+ H _2 O$[/tex]

[Terjawab] Fill in the name and empirical formula of each ionic compound that could be formed from the ions. | Some ionic compounds | | --- | --- | --- | --- | | cation | anion | empirical formula | name of compound | | [tex]Cr ^{2+}[/tex] | [tex]SO _4^{2-}[/tex] | | | | [tex]Mg ^{2+}[/tex] | [tex]C _2 H _3 O _2^{-}[/tex] | | | | [tex]Na ^{+}[/tex] | [tex]IO _2^{-}[/tex] | | |