rate of reactions Flashcards
what is the relationship between rate and time?
they are inversely proportional; the faster the rate the shorter the time
what does collision theory state?
a reaction can only happen if particles collide,the particles need to collide with enough energy to react
what are some factors that speed up a reaction?
temperature concentration of solutions pressure of gases surface area using a catalyst
how can the rate of reaction be measured?
how much reactant is used
measuring how much product is formed and how long it takes
what is a catalyst’s purpose?
to lower the activation energy, resulting in more collisions because it lowers the activation energy so that a greater proportion of particles have enough energy to react.
how do catalyst’s act quickly?
because they have a large surface area, therefore meaning they speed up reactions very fast.
how does concentration of a solution speed up a reaction?
when you increase the concentration, more molecules and ions interact to form new compounds therefore means, faster reaction rate by all the new formed compounds
how does surface area speed up the reaction rate?
increasing surface area, exposes more of the surface, this means the more frequent collisions in the same time. by increasing the surface area to a solid means more collisions happen faster.
how does temperature speed up a reaction?
when increasing the temperature in a reaction, means the particles and molecules move around faster and collide more frequently due to higher than average kinetic energy.
