Reaction Rates (Enzymes) Flashcards
What is a catalyst?
A substance which increases the rate of a reaction without being chemically changed or used up in the reaction.
How do catalysts affect reaction products?
Using a catalyst won’t change the products of the reaction.
What is the role of a catalyst in terms of activation energy?
Catalysts work by decreasing the activation energy needed for a reaction to occur.
What do catalysts provide to lower activation energy?
An alternative reaction pathway that has a lower activation energy.
Why are catalysts important in industrial reactions?
They increase reaction rate and reduce energy costs.
What is a key characteristic of catalysts regarding their quantity?
You only need a tiny bit to catalyse large amounts of reactants.
True or False: Catalysts can be used interchangeably for any reaction.
False.
What type of profile shows the energy levels of reactants and products in a reaction?
Reaction profiles.
What are enzymes?
Biological catalysts that catalyse the chemical reactions in living cells.
Name three types of reactions catalysed by enzymes.
- Respiration
- Photosynthesis
- Protein synthesis
What reaction do enzymes from yeast cells catalyse in the fermentation process?
The conversion of sugars (such as glucose) into ethanol and carbon dioxide.
Fill in the blank: Enzymes are ______ catalysts.
[biological]
What is the effect of a catalyst on the reaction profile?
The activation energy for the catalysed reaction is much lower than the uncatalysed reaction.
