For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)?2Na(s)+Cl2(g)→2NaCl(s)H2 (g)+12O2(g)→H2O(g)Na(s)+12Cl2(g)→Na Cl(s)H2O2(g)→12O2(g)+H2O(g)2H2(g)+O 2(g)→2H2O(g)Na(s)+12Cl2(l)→NaCl(s)

When you perform this reaction, what could remain at the end of the reaction? check all that apply. excess reactant aqueous copper chloride excess reactant aluminum oxygen product solid copper carbon dioxide product aqueous aluminum chloride water

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.