Rate Of Reaction Flashcards
What is the product not in excess called?
Limiting factor
What apparatus is used to measure the mass of a gas in a rate of reaction test?
Cotton ball
Flask
Mass scale
Why do you use a cotton ball to measure the mass of a gas in a RoR test?
A cotton ball is used so that some of the mixture in the flask does not spit out
Name five factors that influence the Rate of Reaction?
Temperature
Concentration
Pressure
Catalysts
Surface Area
Fill in the Gaps.
Particle collision Theory: Reactions can only occur when two particle ______ . NOT ALL COLLISION RESULT IN A REACTION. For collision to result in a reaction the collision must have sufficient ______ . Collisions which result in a reaction are called __________.
Collide
Energy
Successful
State the Effect of Surface area.
More finely divided solid reactant = larger surface area. That means by increasing the surface area more of the particles are being exposed to the reactants. Meaning more collisions per second, meaning more successful collision per second. Causing a higher rate of reaction.
What concept must you always include in a collision theory answer?
Time - collisions per second or frequency of collision.
What is the effect of concentration?
Higher concentration = more particle in a certain area. Particles closer together. Collisions happen more frequently. Probability of successful collision per unit time increases.
Define activation energy?
Activation energy is the minimum amount of energy which must be possessed by colliding particles before a collision can result in a reaction.
Effect of temperature on rate of reaction?
Higher temperature, leads to higher rate of reaction. This is mainly because, as temperature increases the molecules have more kinetic energy. Particles move faster. Collide more frequently. More particles have energy greater of equal to activation energy. Greater proportion of the collision are successful. Therefore there are more successful collisions in a certain time.
How is RoR calculated?
Volume of Gas produced/ time period.
What is a catalyst?
A catalyst is a substance that increases the rate of reaction but is chemically unchanged at the end of the reaction.
Name a catalyst.
Manganese dioxide
Effect of catalyst on rate of reaction?
Speeds up a reaction by providing an alternative pathway of lower activation energy. More particles have energy greater than or equal to activation energy. allows a greater proportion of collision to be successful. More successful collision per time unit.
