Which process below has the correct sign for ΔHº and correct classification (endothermic or exothermic)?

If the following reactions are separately reacted in a chamber, which one will increase the temperature of the chamber?

(i) 6 CO₂ (g) + 6 H₂O (l) → C₆H₁₂O₆ (s) + 6 O₂ (g)

(ii) HCO₃^- (aq) + H⁺ (aq) → H₂O (aq) + CO₂(aq)

(iii) H₂O (l) + HCl (aq) → H₃O⁺ (aq) + Cl^- (aq)

(iv) C₆H₁₂O₆ (s) + 6 O₂ (g) → 6 CO₂ (g) + 6 H₂O (l)

Identify the sign of enthalpy change for each process below. 

a. Formation of morning dew on plants

b. Burning wood

c. Formation of dry ice fog

Consider the following reaction:
H₂(g) → H(g) + H(g)

Would you expect the magnitude of ΔH to increase, decrease, or stay the same if H₂(l) were consumed instead of H₂(g)?

Identify the exothermic reaction(s).

a) AgCl (s) → Ag⁺ (aq) + Cl^– (aq); ΔH = 127 kJ/mol

b) 2 Mg (s) + O₂ (g) → 2 MgO (s); ΔH = –1203 kJ/mol

c) Na₂SO₄ • 10 H₂O (s) → Na₂SO₄ (aq) + 10 H₂O (l); ΔH = 74 kJ/mol

d) 2 Al (s)+ Fe₂O₃(s) ⟶ 2 Fe (s) + Al₂O₃ (s); ΔH = −852 kJ/mol

e) 2 Fe₂O₃ (s) + 3 C (s) → 4 Fe (s) + 3 CO₂ (g); ΔH = 468 kJ/mol

f) CaO (s) + H₂O (l) → Ca(OH)₂ (s); ΔH = −65.2 kJ/mol

2.50 g of solid silver nitrate was dissolved in 150 g of water in a coffee-cup calorimeter. 

AgNO₃(s) → Ag⁺(aq) + NO₃⁻(aq)

Is the process exothermic or endothermic if the temperature drops from 29.3 to 28.2 °C?