Lesson 3 Flashcards
Exothermic reaction
A chemical reaction that releases thermal energy
Endothermic reaction
Chemical reactions that absorb thermal energy
Activation energy
The minimum amount of energy needed to start a chemical reaction
Catalyst
Substance that increases reaction rate by lowering the activation energy of a reaction
enzyme
A catalyst that speeds up chemical reactions in living cells
Inhibitor
A substance that slows or even stops a chemical reaction
What happens when bonds between Adams break
They absorb energy from their surroundings
What happened when new bonds form
They release energy to the surroundings
What are two factors about particle collisions that affect rate
How often the particles collide and how fast they collide
What are four factors that affect rate of reaction
Surface area temperature concentration and pressure
If you increase or it increases the reaction rate besides what kind of factor
Everything if you speed it up it goes faster for service area which it go slower
How does a catalyst increase reaction rate?
By increasing the contact between particles
What happens in exothermic reaction
Thermal energy is released we can get hotter and the reactants are products plus thermal energy
What do both exothermic and reactions do?
Both use activation energy to start the reaction
What happens in a endothermic reaction
Thermal energy is absorbed making it colder and the products are reactants and thermal energy
What’s the difference between inhibitors and catalysts
Catalysts speed up the reaction by lowering the activation energy. But inhibitors are substances that slow down or even stop reactions.
What happens to atoms during a chemical reaction?
They are rearranged. NOT DESTROYED!!!!!!
What happens to the total mass in. Chemical reaction?
It stays the same
What are the factors that affect reaction rate?
Surface area
Temperature
Concentration
Pressure
How to surface area affect rate of reaction
Bigger the service area the fast of the reaction
How does temperature affect rate of reaction?
The greater the temperature the higher the speed of particles particles collide were often and with more force
How does concentration affect the reaction rate
The higher concentration particles are closer together causing more collisions
How does the pressure affect the reaction rate
The pressure the closer together the particles are which means more collisions
What is the purpose of activation energy
To start reactions
Why do chemical reactions involve a change in energy?
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