Reaction Kinetics: Heterogenous vs Homogenous - 65 Characters

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Reactions in heterogeneous systems typically occur at different rates compared to homogeneous reactions due to factors such as surface area and the state of reactants. Heterogeneous reactions involve reactants in different phases, where surface area plays a crucial role in reaction speed, while homogeneous reactions occur in a single phase, allowing for more uniform interaction. The discussion highlights that temperature, concentration, and the nature of reactants and catalysts influence both types of reactions, but only surface area significantly affects heterogeneous reactions. When evaluating reaction rates, the states of matter (aqueous, gas, liquid, solid) are important, as they can indicate the potential speed of reactions. For example, reactions involving aqueous ions may proceed faster than those involving solids. The question regarding which reaction is slowest at room temperature prompts consideration of these factors, particularly in the context of Hess's law, which relates to the energy changes in chemical reactions.
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would reactions happen faster in heterogenous rxns or in homogenous? also, i was wondering if i am correct in assuming that heterogenous & homogenous reactions affect: temp, concentration, nature of reactants and catalysts? only surface area affects heterogenous.

for this question, would u look at the states: aq>g>l>s ? or whether it is heterogenous/homogenous?
1. Which of the following reactions is the slowest at room temperature?



A. Zn(s) + S(s) → ZnS(s)

B. Ba2+(aq) + SO42-(aq) → BaSO4(s)

C. NH3(g) + HCl(g) → NH4Cl(g)

D. 2 Ag+(aq) + CO32-(aq) → Ag2CO3(s)
 
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try to be a bit more clear when asking questions
also, i was wondering if i am correct in assuming that heterogenous & homogenous reactions affect: temp, concentration, nature of reactants and catalysts? only surface area affects heterogenous.
what on Earth are you trying to say?

Think about how reactions would proceed in light of hess' law. How would reaction A) occur, what type of reaction is it?
 

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