Chapter 5 - How Much, How Fast & How Far?
Unlock The Secrets of Reactivity 2.2.1
Table of content
What's Up With Reaction Speed? π’ vs π
- Chemical reactions: Some are super quick, like explosions (think of fireworks!), and others are ultra-slow, like making fossil fuels (imagine waiting a few million years for your car's fuel!).
- “Fast” and “Slow”? Too vague for science! So, let’s get precise.
Rate of Reaction: The Formula π
- It's like measuring how fast you run, but for chemicals!
- Rate of Reaction (ν) = Change in concentration (Δc) / Time taken (Δt)
- Fancy term: This is the average rate. Like your average speed during a jog.
- Units? Usually: moldm−3 s−1. But there are others like mmoldm−3min−1.
Gotcha: Reaction Rate Isn't Negative π«
It's always positive! Just like you can't run at a -5 km/hr speed. We use the absolute value (that vertical line thing - |Δc|) to ensure this.
Real-World Example π
If species X's concentration drops from 0.50 to 0.20 in 25 seconds, it's like dropping 30 cents in 25 seconds. The rate? 0.012 moldm−3 s−1.
Not All Participants Are Equal! π€Ή
- In a reaction, if molecules are not reacting in a 1:1 ratio, their individual reaction rates vary.
- Fun fact: We can adjust for this! Just divide by their stoichiometric coefficients.
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Chapter 5 - How Much, How Fast & How Far?
Unlock The Secrets of Reactivity 2.2.1
Table of content
What's Up With Reaction Speed? π’ vs π
- Chemical reactions: Some are super quick, like explosions (think of fireworks!), and others are ultra-slow, like making fossil fuels (imagine waiting a few million years for your car's fuel!).
- “Fast” and “Slow”? Too vague for science! So, let’s get precise.
Rate of Reaction: The Formula π
- It's like measuring how fast you run, but for chemicals!
- Rate of Reaction (ν) = Change in concentration (Δc) / Time taken (Δt)
- Fancy term: This is the average rate. Like your average speed during a jog.
- Units? Usually: moldm−3 s−1. But there are others like mmoldm−3min−1.
Gotcha: Reaction Rate Isn't Negative π«
It's always positive! Just like you can't run at a -5 km/hr speed. We use the absolute value (that vertical line thing - |Δc|) to ensure this.
Real-World Example π
If species X's concentration drops from 0.50 to 0.20 in 25 seconds, it's like dropping 30 cents in 25 seconds. The rate? 0.012 moldm−3 s−1.
Not All Participants Are Equal! π€Ή
- In a reaction, if molecules are not reacting in a 1:1 ratio, their individual reaction rates vary.
- Fun fact: We can adjust for this! Just divide by their stoichiometric coefficients.
Unlock the Full Content!
Dive deeper and gain exclusive access to premium files of Chemistry SL. Subscribe now and get closer to that 45 π
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