Concentration and Reaction Rates - Science Theater 10. Surface Area Effect on Rate of Reaction. Rates of Reaction - Catalyst. Temperature and Reaction Rate. GCSE Chemistry Rates of Reaction Revision - Changing the Rate of a Reaction. There are 4 methods by which you can increase the rate of a reaction: 1. Increase the concentration of a reactant. 2. Increase the temperature of the reactants. 3. Increase the surface area of a reactant. 4. Before, we discover the reasons for the above causing an increase in rate, we must first look at what is needed to cause a reaction to occur! If we take the reaction between magnesium and hydrochloric acid, in order for them to react together: 1. 2. The rate of a reaction depends on how many successful collisions there are in a given unit of time.
The Effect of Concentration If the concentration of acid (a reactant) is increased, the reaction proceeds at a quicker rate. In dilute acid there are less acid particles. In concentrated acid there are more acid particles, therefore there is a greater chance of an acid particle hitting a magnesium particle. Remember: the more successful collisions there are the faster the reaction. The graph below shows results from two experiments. GCSE Chemistry Rates of Reaction Revision - The Rate of a Chemical Reaction. Rate is a measure of how fast or slow something is. In chemistry, we speak of a rate of reaction, this tells us how fast or slow a reaction is. Why do chemists want to know the rate of a reaction? If you are making a product, it is important to know how long the reaction takes to complete, before the product is produced.
Rate is a measure of a change that happens over a single unit time. That unit time is most often a second, a minute, or an hour. Reaction between zinc and dilute hydrochloric acid What we observe over time is that gradually the zinc disappears and bubbles of gas appear. To summarise, during this reaction zinc chloride and hydrogen gas are been formed at the same time as zinc and hydrochloric acid react.
Using the reaction between zinc and hydrochloric acid as an example, the following are methods by which you could measure the rate of that reaction. 1. 2. 3. 4. When choosing which method to measure rate always choose the most straightforward. Methods Used for Measuring Rate 1. GCSE Bitesize: Measuring rates. Rader's CHEM4KIDS.COM.