Of the following, the heat of formation,  ΔH°f, is zero for              .  

Consider the reaction of iron (III) oxide with carbon to form iron metal and carbon dioxide gas: 2 Fe2O3 (s) + 3 C (c) →  4 Fe (s) +  3 CO2 (g)            

Based on the activity series, which of the following solutions would result in a spontaneous single displacement reaction with lead metal?

Consider the reaction where hydrogen gas reacts with bromine gas to form hydrogen bromide gas: H2 (g) + Br2 (g) →  2 HBr (g)      

What is the oxidation number for the chlorine atom in the compound, potassium perchlorate, KClO4?

46 mL of water is added to 204 mL of 7.0 M AgNO3 What is the concentration, in M, of the resulting solution? Hint:  Vwater = V2 (final volume) – V1 (initial volume)

Consider the reaction below: CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g) The element                   is undergoing oxidation and                     is the oxidizing agent.

Copper (II) hydroxide is formed in the following reaction: CuSO4 (aq) + 2 NaOH(aq) →  Cu(OH)₂ (s) +  Na2SO4 (aq)  How much copper(II) hydroxide precipitate (in g) is formed when 25.0 mL of 0.612 M NaOH reacts with an excess of CuSO4?   Hint: Molar mass for Cu(OH)2 is 97.57 g/mol

Based on the activity series, which of the following solutions would result in a spontaneous single displacement reaction with zinc metal?

What is the concentration (in M) of iodide ions when 0.200 moles of FeI3 is dissolved in 950 mL of water?