An aqueous solution of blue copper(ii) ions can react with chloride ions to form a yellow copper compound. the ionic equation for this reaction is: cu² + 4ci- ⇌ [cucl]²- the forward reaction is endothermic. what two things can you say about the enthalpy change for the reverse reaction?

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

What does the symbol (–hfus) indicate in a phase change?