• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

investigate the effects of temperature on the reaction between sodium thiosulphate and hydrochloric acid.

Extracts from this document...


Science Coursework: Rates of Reaction Skill section P Aim: To investigate the effects of temperature on the reaction between sodium thiosulphate and hydrochloric acid. Scientific Knowledge: Reaction: When atoms or groups of atoms re-arrange resulting in the change of molecular structure in substances, is only possible when the particles collide with the other reactants with enough energy to form the transition state and change it into other products. Without such circumstances reaction will not be possible. This is collision theory. The factors that affect the rate of reaction are: - Temperature - Pressure - Size of surface area in which reaction will take place - The concentration of reactants The reaction will take effect faster if any of these are increased. That is all because of collision theory. Reactants also need to have sufficient energy, activation energy, to react. If increasing temperature, the reactants will vibrate more making it more likely for them to collide and collide harder as they have more energy, meaning that they will have the activation energy to make reaction more likely. If pressure is high then there is more chance for the reactants to collide as they will be closer to each other. If surface area is increased then more reactants can collide with each other as there is more space for collision. ...read more.


Also, we had required no help to set up the equipment during the experiment. Safety Procedures: As I have explained in my plan, there were some important safety issues I had to take into account. When recording my results, I had to keep my paper as far away as possible from the solution, so incase the solution was tipped over, the results weren't lost. Also, to avoid the solution harming any part of my body, I made sure I was protected by wearing goggles, gloves and an apron. Fair test: During the experiment, we followed our plan carefully to ensure a fair test. We used a stopwatch so we could precisely calculate how long it took for the reactants to react. Also, there was more than 1 person responsible for confirming when the cross has disappeared; this is to ensure that there's always a back up incase someone gets distracted. Explaining the results: As you can see below, there is a table showing the results of my experiment. I did 6 separate tests and got 3 different times for each temperature. To find out the overall average time for each temperature, we added all 3 results for each temperature and then divide by 3. Then, you convert this to 3 significant figures to be as accurate as possible. ...read more.


Variables that we controlled in the plan: I have kept all the factors affecting the rate of reactions the same, except for temperature as it is the effect of temperature that I wanted to investigate. I kept the concentration of reactants the same by only using 40cm� of sodium thiosulphate and 10cm� of hydrochloric acid. I controlled surface area through using liquids as reactants. Lastly, I controlled the concentration by keeping the molar at 1. I think that I successfully managed to control the variables in this experiment. The variables were controlled so that my results of the experiment were fair and accurate, so that we can build a firmer conclusion on the rates of reaction. Conclusion: My prediction was correct. I predicted that the higher the temperature the faster the reaction, which also means, the lower the temperature the longer the reaction (they are indirectly proportional). If I were to do this experiment again I would use an ICT light sensor that can track the reaction much more accurately than human eyes. I would also use a room which has a constant temperature which is also the same temperature as the experiment, a 1�C room for a 1�C test so that the heat isn't affected by the room temperature. Lastly, I would use better measuring devices such as burettes to measure liquids in the experiment. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Patterns of Behaviour essays

  1. Marked by a teacher

    Chemistry Coursework - How the concentration effects the rate of reaction between sodium thiosulphate ...

    almost identical as the graphs look almost identical except for on both of the graphs there are two points that do not quite fit maybe due to experimental error but are relatively close and have no real affect on the graphs.

  2. The effects of temperature on the rate of reaction ofsodium thiosulphate with hydrochloric acid.

    The higher the activation energy the slower the rate of reaction and the level of the activation energy depends on the reaction. Energy profile for exothermic reaction Energy profile for endothermic reaction An increase in temperature decreases the amount of time it takes for the reactants to reach the activation

  1. To investigate the effect of varying the masses of white sugar and yeast and ...

    During the fermentation process, most of the starches used are the ones damaged during the milling process. Because the particles are damaged, they can easily absorb water during the dough making process. This water contact triggers the enzymatic activity. A non-damaged particle of starch will only retain water at its periphery and not inside the particle itself.

  2. Free essay

    Close Your Eyes

    Once I was in the car I slammed the door shut unravelled my headphones, turned on my iPod and started to play McFly. There my favourite band and wherever I go, their music travels with me. As I listened to the intro of "I'll be ok" I laid my head back, closed my eyes and listened to the lyrics.

  1. Science Coursework

    only 40.0cm3 Sodium Thiosulphate to be used and 10.0cm3 water to be used. But only 5.0m hydrochloric acid is to be used. 8.once the sodium Thiosulphate,. and water has been put in the flask and adds 5.0cm3 of hydrochloric acid.

  2. Investigating the effects of temperature on the rate of clotting milk and Rennet

    For the main experiment the ratio of milk to rennet was decided upon as 8:2, therefore in each test tube there would be 8cm3 of milk, and 2cm3 of Rennet. This is a much simpler ratio which is easy to remember and saves any confusion whilst measuring out the quantities.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work