Rate Of Reaction Flashcards
What four things effect the rate of reaction
Temperature
Concentration / pressure in gases
Catalyst
Surface area of solids
What is the equation for rate of reaction
Rate of reaction= amount of product used or product formed / time
What three ways of measuring rate of reaction are there
Precipitation
Change in mass
Volume of gas
How do you measure the volume of gas given off
Use a gas syringe
Describe the experiment of the reaction of hydrochloric acid and marble chips
Measure the gas volume with a gas syringe at regular intervals.
The repeat the same but crunch the marble down more
Why does a higher temperature increase the amount of collisions
The particles move much quicker so collide more often
Why does a higher concentration increase the amount of collisions
If the concentration is greater then more particles of reactants are around so collisions are more likely. If pressure is increased then this has the same effect as the particles are close together
Why does a larger surface area increase the rate of reaction
The reactants have more area to react on so the collisions will be more frequent
Faster collisions increase the…
Rate of reaction
Define a catalyst
A catalyst is a substance which speeds up a reaction without being changed or used up
Why do catalysts make it cheaper in industry
Speed of Reaction increased means more production
Reaction could occur at lower temperatures so less money on heating (therefore also more sustainable)
What are the disadvantages of catalysts In industry
Expensive in first place
Catalyste can be poisoned by impurities
Exothermic reactions…
Releases energy
Give some examples of exothermic reactions
Combustion
Oxidation
Neutralisation
In endothermic reactions….
Energy is absorbed
