High School Statutory Authority: Students shall be awarded one credit for successful completion of this course. Chemistry or concurrent enrollment in Chemistry. This course is recommended for students in Grades 10, 11, or
Pressure of gaseous reactants or products If you are planning an investigation, I suggest that you investigate the effects of temperature or the effects of the concentration of the reactants because these will allow you to choose a suitable range of values for the controlled or independent variable.
The dependent variable will be the rate of the reaction. Keep all the other variables fixed. To make a prediction for your investigation you will have to ask yourself the question: What will happen to the rate of the reaction when I increase the temperature?
The answer to that question is your prediction. The next thing to do is to explain your prediction. You will have to answer the question: Why will the reaction go faster if I increase the temperature?
The answer to this question is your explanation, and to get the highest possible marks, you will have to provide a full scientific explanation.
Once you have written your hypothesis prediction with Design lab chemistry surface area you will decide how to do the experiments, i. How does temperature affect the rate of a chemical reaction? When two chemicals react, their molecules have to collide with each other with sufficient energy for the reaction to take place.
This is collision theory. The two molecules will only react if they have enough energy. By heating the mixture, you will raise the energy levels of the molecules involved in the reaction.
Increasing temperature means the molecules move faster. This is kinetic theory. How do catalysts affect the rate of a reaction? Catalysts speed up chemical reactions. Only very minute quantities of the catalyst are required to produce a dramatic change in the rate of the reaction.
This is really because the reaction proceeds by a different pathway when the catalyst is present. Adding extra catalyst will make absolutely no difference. There is a whole page on this site devoted to catalysts.
How does concentration affect the rate of a reaction? Increasing the concentration of the reactants will increase the frequency of collisions between the two reactants.
So this is collision theory again. You also need to discuss kinetic theory in an experiment where you vary the concentration. Although you keep the temperature constant, kinetic theory is relevant.
This is because the molecules in the reaction mixture have a range of energy levels. When collisions occur, they do not always result in a reaction.
If the two colliding molecules have sufficient energy they will react. If reaction is between a substance in solution and a solid, you just vary the concentration of the solution. The experiment is straightforward.
If the reaction is between two solutions, you have a slight problem. Do you vary the concentration of one of the reactants or vary the concentration of both? You might find that the rate of reaction is limited by the concentration of the weaker solution, and increasing the concentration of the other makes no difference.
What you need to do is fix the concentration of one of the reactants to excess. Now you can increase the concentration of the other solution to produce an increase in the rate of the reaction.
How does surface area affect a chemical reaction? If one of the reactants is a solid, the surface area of the solid will affect how fast the reaction goes. This is because the two types of molecule can only bump into each other at the liquid solid interface, i.The Nanoscale Physics Research Laboratory was established in - the first centre for nanoscience in the UK - and formally opened in the Physics East building in May by Professor Sir John Cadogan FRS.
This page describes and explains the effect of changing the surface area of a solid on the rate of a reaction it is involved in. This applies to reactions involving a solid and a gas, or a solid and a liquid.
View Lab Report - Chemistry Design lab from CHEMISTRY at Florida State University. I. Raw Data Total volume of gas produced from reaction of 6 molar HCl with Zinc Total Gas Total Gas Total.
Many factors can affect this rate, including temperature, surface area, and the concentration of the reactant. In this lab, the effect of the concentration of hydrochloric acid on the rate of . Thank you so much for this!!! I am learning this in Science class and I have to write a lab report on an experiment we conducted.
The experiment was about how temperature affected the reaction rate. The Purdue University Online Writing Lab serves writers from around the world and the Purdue University Writing Lab helps writers on Purdue's campus.