Which process is always exothermic?
Because the molecules of water vapor touching the cold glass will lose their heat, slow down, and become liquid droplets. Therefore, condensation is exothermic, because heat must be removed from the gaseous molecules in order for them to condense. 3.
Which statement best describes the way a catalyst works?
Which statement best describes the way a catalyst works? It increases the value of ΔH.
What are three ways to increase the rate of a reaction?
There are 4 methods by which you can increase the rate of a reaction:
- Increase the concentration of a reactant.
- Increase the temperature of the reactants.
- Increase the surface area of a reactant.
- Add a catalyst to the reaction.
What are 5 ways to increase the rate of reaction?
Rates of Reaction
- There are 5 ways to increase the rate of a reaction. The rate of a chemical reaction may be increased by.
- 1) Increasing the temperature.
- 2) Increasing the concentration (in solution).
- 3) Increasing the pressure (in gases).
- 4) Increasing the surface area of a solid.
- 5) Using a catalyst.
How do you know if its a fast or slow step?
In a reaction with a slow initial step, the rate law will simply be determined by the stoichiometry of the reactants. In a rate law with a fast initial step, no intermediates can appear in the overall rate law.
Which is the best definition of rate determining step?
Which is the best definition of rate-determining step? the elementary step that limits how fast the overall reaction proceeds. Consider the following proposed mechanism to prepare SO3.
How many steps are in the mechanism?
The mechanism shows that the reaction takes place in two steps and describes exactly how those steps happen in terms of bonds being broken or made. It also shows that the steps have different rates of reaction – one slow and one fast.
How do you calculate overall rate of reaction?
Key Takeaways
- Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt.
- The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.