Text: Combustion reaction: Burning a candle
Outline at least 3 factors that affect the rate of this reaction.
1. Oxygen concentration: The rate of the combustion reaction is directly proportional to the concentration of oxygen present. Higher oxygen concentrations will result in a faster reaction rate.
2. Temperature: Increasing the temperature of the surroundings will increase the rate of the combustion reaction. This is because higher temperatures provide more energy for the reactant molecules, leading to more frequent and energetic collisions.
3. Surface area: The rate of the combustion reaction is also influenced by the surface area of the candle. A larger surface area allows for more reactant molecules to come into contact with oxygen, resulting in a faster reaction rate.
Outline a method to determine the rate and order of this reaction.
To determine the rate and order of the combustion reaction, the following method can be used:
1. Measure the mass of the candle before and after burning it for a specific period of time.
2. Calculate the mass difference between the initial and final measurements. This will give the mass of the candle that has been consumed during the reaction.
3. Divide the mass consumed by the time taken to burn the candle. This will give the rate of the combustion reaction.
4. Repeat the experiment with different initial masses of the candle and record the corresponding rates.
5. Plot a graph of the rate of the reaction against the initial mass of the candle.
6. Analyze the graph to determine the order of the reaction. If the graph shows a linear relationship between the rate and the initial mass, the reaction is likely to be first order. If the graph shows a curved relationship, the reaction may be second or higher order.