Rates Of Reaction Flashcards
What is the enthalpy change of an exothermic reaction?
Negative
What is the enthalpy change of an endothermic reaction?
Positive
What is activation energy?
The minimum kinetic energy required for a successful collision to occur between particles.
What is the relative rate formula?
Relative Rate = 1 ÷ time
What is needed for a successful collision?
Particles must collide with sufficient energy.
Pariticles must collide with correct geometry.
How would increasing the concentration impact the rate of reaction?
It would increase as there would be more particles in a particular space, leading to more collisions and therefore a greater number of successful collisions.
How would decreasing Pariticles size impact the rate of reaction?
It would increase the rate of reaction as the larger the surface area, the more of a solid is exposed to the other reactant which results in more collisions.
What is temperature?
Temperature is a measure of the average kinetic energy of particles.
How would increasing temperature impact the rate of reaction?
It would increase, as a higher temperature would cause particles to move faster with greater kinetic energy. This means that there are more collisions and also a greater number of collisions will occur with sufficient energy.
What is an activated complex?
A highly unstable arrangement of atoms in which the bonds in the reactants are being broken at the same time as the bonds in the products are forming.
What is the enthalpy change?
The difference in potential energy between reactants and products.
What is an exothermic reaction?
An exothermic reaction releases heat.
What is an endothermic reaction?
An endothermic reaction takes in heat energy
Why is the enthalpy change for exothermic reactions negative?
They release some of their potential energy.
Why is the enthalpy change of an endothermic reaction always positive?
Heat energy is absorbed.
