Rates of reaction
What is RATE?
How fast a chemical reaction happens is a very important consideration.
If paint dries too quickly it will become impossible to apply.
If the fuel in a rocket burns too slowly - the rocket will not get off the ground
Task 1. Consider the word RATE.
- When we look at applying for a job we will normally want to know about the rate of pay.
- When we save or borrow money we will want to know about the interest rate which applies.
- When looking at using chemical reactions we will want to know about the rate of reaction.
Try to write a definition of each of the three rates mentioned above. What quantity is involved in all three?
Compare the rate of reaction in each experiment.
What can you say about the relationship between rate and concentration ?
Rates in the lab
The video shows a classic reaction being performed.
Task 2. Watch the first video closely.
The two solutions used are sodium thiosulfate and dilute hydrochloric acid
- Try to work out and write down what elements are present in the two solutions. Look up the names if necessary.
- the cloudy suspension is actually fine particles of one of these elements. Which element do you think it is?
- What single measurement could you make with this reaction which would give you an idea of the rate of the reaction?
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