Chemistry Report: Experiment On Rates Of Reaction

3605 words - 14 pages

Rates of Reaction
CaCO3 + 2HCl → CaCl2 + H2O + CO2
In this report I will be suggesting my predictions on what the rates of reaction will be and what the actual rates of reaction are. I will do this by collecting data from experiments and I will show this by putting data into a table.
The main aim of my experiment is to find the rate of reaction over time taken and the rate of reaction when the concentration of hydrochloric acid increases or decreases. I will try to make my experiment as accurate as I can. I will carry out three trials to make my test fair. I will also use the correct equipment for accurate results.
Also, I will be using three different variables to use in my report; The Independent Variable, Dependant Variable and the Control Variable.

The independent variable will be the amount of water and Hydrochloric Acid I use because that is what changes through the experiment.

The dependant variable will be about measuring the time it takes for the marble powder to react with different concentrations of HCl.

The control variable will be the amount of marble powder I use in each mixture and this will be the same amount in every experiment because this is what will have to be the same all the way through my experiment to get my results how I want and to measure the rates of reaction correctly.

Changes in the Rate of Reaction

Below is a list of variables that could affect the rates of reaction:

• Temperature – when the temperature is increased, the rate of reaction is quicker. This is because the particles have more energy to move around and to collide with each other. Therefore, I think the more collisions between particles there are, the faster the rate of reaction is.

• Concentration – by adding more acid than water in a concentration it will make the reaction quicker because there is more acid than water to react with the marble powder. If you add more water, then the reaction will take longer because there is less acid to react with the marble powder.

• Surface Area – if we increase the surface area, we increase the rate. Surface area is the measure of how much surface is exposed. So, marble chips have a smaller surface area than the marble powder. This means that the rate of the marble powder will be quicker than the marble chips.

Here are a few reasons why changing the variable may have an effect:

• Temperature – as explained above; if you were to change the temperature, it will change the rate as well. This is because the heat provides energy to the acid and water particles, which will mean that they react with the marble powder (calcium carbonate) more.

• Concentration – whenever you change the concentration there is always going to be a change in the rate of reaction. For example, when you change the concentration of acid, it is more likely to react quicker because there are more acid particles in the same mixture. So, there is a greater chance of acid particles colliding with each other on the...

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