Which equation correctly relates the heat of reaction to the standard heats of formation?
∆h° = ∆hf ° (products) + ∆hf ° (reactants)
∆h° + ∆hf ° (products) = ∆hf ° (reactants)
∆h° = ∆hf ° (products) – ∆hf ° (reactants)
∆h° – ∆hf ° (reactants) = ∆hf ° (products)

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

Which diagram represents the phase tha occurs after a solid melts?

Which description best characterization the motion of particles in a solid