Which reaction is exothermic?

CH4 + 2O2 - - >CO2 + 2H2O + 891 kJ

NH4NO3 + H2O + 25 kJ - - > NH4 + (aq) + NO3 - (aq)

2H2O + 286 kJ - - > 2H2 + O2

N2 + O2 + 181 kJ-->2NO

Sand is converted to pure silicon in a three step process. The third step isSiCl4 (g) + 2Mg (s) ? 2MgCl2 (s) + Si (s) ? H = - 625.6 kJWhat is the enthalpy change when 12.5 mol of silicon tetrachloride is converted to elemental silicon? A 12.

One characteristic of a stable ecosystem is

Borax (na2b4o7·10h2o; fw = 381.372 g/mol; density = 1.73 g/ml), a primary standard, was used to standardize a solution of hno3. titration of 0.2619 g of borax required 21.61 ml. what is the molarity of the hno3

What is the balanced chemical equations for fe + o2 → iron (౹౹) oxide?

Equilateral triangle What's the answer

What are the subscripts for the molecular formula of C2H3

What does the dashes line represent? A. Medium B. Boundary C. Normal D. Incident Ray

Only a small amount of cerium oxide nanoparticles is needed because the nanoparticles ... 1) are elements 2) are very reactive 3) have a high surface area to volume ration

Describe the solubility of water compared to ethanol?

When the free-energy change (AG) of a reaction is negative, the reaction is said to be: Endergonic Non spontaneous Spontaneous Endothermic