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Flashcards in Reaction Rates Deck (10)
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1

Rate of reaction

Measures how fast a reactant is being used up or how fast a product is being formed
Defined as a change in conc of reactant/ product in given time

2

How does the concentration of product increase over time

R of r, fastest, high concentration of reactants forming product
Slows down as reactants are used up, conc goes down
R of r=0 reactant used up conc stops changing, parallel to x

3

Factors that affect r of r

Conc/ pressure (gas)
Temp
Catalyst
SA of solid reactants

4

Collision theory

2 particles must collide for a reaction to occur

5

Criteria for effective collisions

Correct orientation
Sufficient energy to overcome activation energy barrier of reaction

6

Concentration and rates of reaction

Increase conc, increase no if particles in same volume
Particles closer together, collide more frequently
More effective collisions, increase r of r

7

Pressure and r of r

Increase pressure, same no of particles in smaller volume
Particles closer together, collide more frequently
More effective collisions, r of r increases

8

Following progress of reaction

Monitoring removal of reactant, decrease in conc
Following formation of product, increase in conc

9

Reactions that produce gas

Monitor volume of gas produced at regular time intervals, gas collection
Monitoring loss of mass of reactants with balance
Find rate of reaction with tangents

10

Reactions that lose mass

Monitor mass change at regular time intervals
Place cotton wool to avoid acid spitting and allow gas to leave