Investigating Rate of Reaction by Change in Mass
Chemistry: Cambridge International GCSE Supplement, topic 6.2.3
Investigating Rate of Reaction by Change in Mass
Rate of reaction measures how quickly chemicals react, indicated by mass changes. Track mass loss (gas escaping) over time using a balance and sealed flask.
What is rate of reaction?
- Rate of reaction shows how fast chemicals turn into new substances.
- Chemicals lose or gain mass when reacting.
- Measuring mass change helps find how quickly a reaction happens.
,w_800.jpg)
Using change in mass to investigate rate
- Use a balance to record mass at timed intervals.
- Reactants or products lose mass as gas leaves container.
- Faster mass change means a faster reaction rate.
Equipment for change in mass - method
- Use a conical flask, balance, and stopper with a delivery tube.
- Place the flask on the balance before starting.
- Record mass before and after the reaction at regular times.
- This helps track how the mass changes quickly or slowly.
Safety and accuracy tips
- Keep the flask sealed to prevent gas escape except through the tube.
- Use a balance that measures to at least 0.01g for accuracy.
- Perform repeated trials to get reliable results.
- Record time precisely using a stopwatch.
Test yourself on Investigating Rate of Reaction by Change in Mass
What does the rate of reaction primarily measure?
What indicates a faster reaction rate when using the change in mass method?