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A piece of cobalt metal is added to each of the following ionic solutions. Which will result in a spontaneous single displacement reaction?

You wish to make 500.0 mL of a 0.125 M solution of CaCl2. What volume (in mL) of the more concentrated 4.50 M solution of CaCl2 is required to make this solution?

Given the following data:              Ca (s)  +  CO2 (g)  +  O2 (g) →   CaCO3 (s)         ΔH =   −812.8 kJ                                 2 Ca (s)  +  O2 (g)    →   2 CaO (s)          ΔH =  −1269.8 kJ     Calculate ΔHrxn  for the reaction:      CaO (s)    +  CO2 (g)   →   CaCO3 (s)

You wish to make 500.0 mL of a 0.125 M solution of CaCl2. What volume (in mL) of the more concentrated 1.50 M solution of CaCl2 is required to make this solution?

Consider the following reaction :   2 S (s)  +  3 O2 (g)  →  2 SO3 (g)           ΔHrxn° = −790 kJ What is the enthalpy change (in kJ) associated with the reaction of 2.55 g of S?

Which of the following statements concerning oxidation numbers is true?

Consider the reaction below:    Mg(s) + 2 HCl (aq) → MgCl₂ (s) + H₂ (g)   In this reaction,                    is oxidized and                     is reduced.

You wish to make 500.0 mL of a 0.125 M solution of CaCl2. What volume (in mL) of the more concentrated 3.50 M solution of CaCl2 is required to make this solution?

Which of the following processess has a negative ΔH (exothermic)?

Given the following data:                      2 C (s)  +  O2 (g)  →  2 CO (g)                 ΔH =   −221.0 kJ      2 C (s)  +  O2 (g)  +  4 H2 (g)   →   2 CH3OH (g)     ΔH =  −402.4 kJ     Calculate ΔHrxn  for the reaction:      CO (g)    +  2 H2 (g)   →    CH3OH (g)