Use the special form of Hess’s law and given ∆H°f of the reactants and products to calculate the heat for the reaction(∆H°rxn) of methane with oxygen :  CH4 (g)  +  2O2(g)   →  CO2(g) +2H2O(l) ∆H°f, methane(g) = -74.60 kJ/mol ∆H°f, water(l) = -285.8 kJ/mol ∆H°f, carbon dioxide(g) = -393.5 kJ/mol

A 25.00 mL sample of the sulfuric acid solution was titrated with 45.42 mL of a 0.9598 M solution of sodium hydroxide, NaOH. What is the molar concentration of the sulfuric acid, H2SO4? H2SO4(aq) + 2 NaOH(aq)   →  Na2SO4(aq) + 2 H2O(l)

How many protons, electrons, and neutrons (respectively) are in an atom of iodine-131?     

The following is an example of a physical change:

The following intermolecular forces exist between the particles in the aqueous solution of NaCl

Which substance in the liquid state has only dispersion forces and hydrogen bonding?

In which of the following substances the molecules will not have hydrogen bonding as their strongest intermolecular interaction? (Hint check the shape and polarity of the molecules)

The following can be used to measure the heat of combustion for an unknown sample?

If 0.500  mol of hydrogen gas completely reacted with 0.5000 mol of bromine gas at constant pressure, releasing 46.25 kJ of heat, which of the following thermochemical equations is correct?

If 0.500  mol of hydrogen gas completely reacted with 0.5000 mol of bromine gas at constant pressure, releasing 46.25 kJ of heat, which of the following thermochemical equations is correct?