Planning - the theory and your experiment design! For example, with the word and symbol equation, short description about the reaction, and so on. This sets the scene.
These reactions only happen if the reacting molecules collide properly. The rate of reaction is the speed of a reaction. When the solution is made more concentrated, there are a greater number of molecules in the same space. This increases the likelihood of reactants colliding properly and so increases the rate of the chemical reaction.
Aim My aim is to investigate how changing the concentration of reactants can change the rate of reaction between hydrochloric acid and sodium thiosulphate.
I will be timing and watching: Hypothesis My prediction is that the reaction between sodium thiosulphate and acid will be fastest when the acid is at its highest concentration. This is because there will be more acid molecules in the same amount of solution, therefore more effective collisions with the sodium thiosulphate, and the rate will be higher.
This is because when there are more molecules in the solution, there are more molecules to collide so this will speed up the reaction, and therefore it is more likely they will collide with each other.
This causes a quicker reaction. Background Research Chemical reactions are to do with changing the materials that form the base of your experiment. This is the reaction I will be considering: Sodium thiosulphate is a colourless, crystal like compound and is used for dyes and is also a salt.
Hydrochloric acid is colourless, poisonous and highly acidic. It is often used as a chemical intermediate and in petroleum production, food processing, pickling, and metal cleaning.
It can also be found in the stomach. These chemicals are perfect for my investigation because they are both clear and colourless. This is good because I will instantly be able to see any change in the solution.
The state symbol for sulphur dioxide is aq not g because it is dissolved in water as its original state would be too toxic and corrosive for me to use safely. I am investigating the different factors which may speed up chemical reactions.
This can be done by: Rates of reaction vary depending on which chemicals are being used and the activation energy required. Reactions that occur slowly have a low rate of reaction.
Reactions that happen quickly have a high rate of reaction. For example, rusting is a slow reaction; it has a low rate of reaction.
Burning and explosions are very fast reactions: Activation energy Activation energy is the energy required to break the bonds of the reactants, so that new bonds can form to make the products. An input of heat energy is required to start some reactions. This energy gives the reactant particles enough energy to collide with enough force to break apart the bonds so that new products can be made from atoms.
The enthalpy change is the amount of heat absorbed or released when a chemical reaction occurs at a constant pressure. I decided that it would be best for me to use a bold marker pen to make the mark more visible under the conical flask.
This ensures that the solution is completely opaque when I stop the timer. The conical flask and all other equipment must be clean as any impurities may contaminate my experiment. Also, it has a narrow top and so it is safer. Using white paper helped the marking to stand out.
I used this to gauge when to stop the reaction — when the black x was obscured by the white sulphur precipitate, the timer was stopped. I tied my hair back, tucked in my tie and pushed all stools and bags under the desk where there is no risk of anyone tripping. I had to make sure that my classmates were safe as well as myself.
I made sure that I had everything before I started. This makes sure that my experiment runs smoothly.Reaction rate is a measure of how quickly the reacta A grade GCSE chemistry coursework – Rates of reaction A grade GCSE chemistry coursework, Rates of reaction, The rate of reaction can be found by measuring the time for I am going to draw a graph analyse by Calculating Rates of Reaction: Formula, Graphs amp; Examples The reaction rate is Marble Chip attheheels.com up the equipment as diagram shows.
The measuring cylinder must be filled with water and then inverted into the tubMeasure the quantity of hydrochloric acid and marble chips to the decided amount. Add water to the /5(2).
Investigating the Rate of Reaction Between Marble Chips and Acid Essay example - Investigating the Rate of Reaction Between Marble Chips and Acid Introduction This is a test to demonstrate the reaction rate between marble chips (CaCO) and hydrochloric acid (HCl).
The rate of a chemical reaction depends on the frequency of the collisions between the atoms or ions of the reactants. In this investigation the rate at which aluminum replaces hydrogen from a solution of hydrochloric acid will be observed. Below is an essay on "Enzyme Rate of Reaction" from Anti Essays, your source for research papers, essays, and term paper examples.
Catalase is an enzyme which is found in most living organisms. It catalyses the decomposition of Hydrogen Peroxide into water and oxygen. Magnesium and Dilute Hydrochloric Acid Practical Aim: To investigate the reaction between magnesium and dilute hydrochloric acid.
Prediction: The more concentrated the acid is, the faster the magnesium ribbon will dissolve. This is because the rate of reaction depends on how frequently the molecules of the reacting substances collide.