Topic 7 Rates Of Reaction And Energy Changes Flashcards
What happens when the particles collide in a reaction?
Reactant particles must collide with each other and the collisions must have enough energy
What is meant by activation energy?
The activation energy of a reaction is the minimum energy needed by reactant particles for a reaction to happen.
What is the effect on the rate of reaction with temperature?
The rate of reaction increases
Particles gain energy
Frequency of collisions increases
What is the effect on rate of reaction with concentration and pressure?
Rate of reaction increases
More particles in the same volume
Frequency of collisions increases
What is the effect on rate of reaction with surface area to volume ratio?
Rate of reaction increases
More particles of reactant are available
Frequency of collisions increases
What is the equation for the mean rate in a volume of oxygen time graph?
Mean rate = volume/time
What is a exothermic reaction?
Heat energy is given out
The reaction mixture or surrounding increases in temperature
What is an endothermic reaction?
Heat energy is taken in
The reaction mixture and surrounding decreases in temperature
Is neutralisation reaction exothermic, endothermic or both?
It is both
Is a displacement reaction exothermic,endothermic or both?
It is only exothermic
Is a precipitation reaction endothermic,exothermic or both?
It is both
Is a dissolving reaction endothermic,exothermic or both?
It is both
What happens to bonds in a endothermic reaction?
Breaking bonds energy is needed
What happens to bond in a exothermic reaction?
Making bonds energy is released
