How does concentration affect the rate of reaction iGCSE?
Increasing the concentration of a solution increases the collision rate. This is because there will be more reactant particles per unit volume, causing more frequent collisions so there are more successful collisions per second, increasing the rate of reaction.
Why does rate of reaction decrease over time iGCSE?
The rate of reaction slows down as the reactants get used up. Eventually no more product (in our example gas) is formed and the reaction has finished.
How does a catalyst increase the rate of a reaction Igcse?
A catalyst is a substance which increases the rate of a chemical reaction without being used up itself. It can be used over and over again. A catalyst lowers the activation energy – the amount of energy needed for a successful collision. There are more collisions, and so a faster reaction.
What factors affect the rate of reaction?
The rate of a chemical reaction is influenced by many different factors, including reactant concentration, surface area, temperature, and catalysts.
What factors affect reaction rate?
What are five major factors that affect reaction rate?
We can identify five factors that affect the rates of chemical reactions: the chemical nature of the reacting substances, the state of subdivision (one large lump versus many small particles) of the reactants, the temperature of the reactants, the concentration of the reactants, and the presence of a catalyst.
What five factors can affect the rate of a reaction?
What is a rate of reaction in chemistry?
Rate of reaction. The rate of a reaction is a measure of how quickly a reactant is used up, or a product is formed.
What factors increase the reaction rate?
In general, increasing the concentration of a reactant in solution, increasing the surface area of a solid reactant, and increasing the temperature of the reaction system will all increase the rate of a reaction. A reaction can also be sped up by adding a catalyst to the reaction mixture.
How does temperature affect rate of reaction Igcse?
Temperature: Increasing the temperature of reactants will give the particles more kinetic energy, so the frequency of collisions between particles will increase and so there is more reaction occurring- the rate of reaction increases.
What causes decrease in rate of reaction?
When you increase the pressure, the molecules have less space in which they can move. That greater density of molecules increases the number of collisions. When you decrease the pressure, molecules don’t hit each other as often and the rate of reaction decreases.
What factors affect the rate of reaction GCSE?
Factors affecting the rate of reaction Temperature The higher the temperature, the quicker the rate of reaction. Concentration The higher the concentration, the quicker the rate of reaction. Surface area The larger the surface area of a reactant solid, the quicker the rate of reaction.
How do you calculate rate of reaction in chemistry?
Chemical Reactions / 7.1 Change & Rate of Reaction / 7.1.2 Rate (Speed) of Reaction It is calculated by how much reactant is used per unit time OR how much product is produced per unit time
Why does the rate of reaction increase at higher temperatures?
At higher temperatures the particles have more kinetic energy so they move faster and with more energy The collisions are therefore more energetic, and there are then a greater number of particles with sufficient energy to react, so the rate of reaction increases
How does volume affect the rate of chemical reaction?
This is because there will be more reactant particles per unit volume, causing more frequent collisions so there are more successful collisions per second, increasing the rate of reaction A single 2 cm length cube has a surface area of 2 x 2 x 6 = 24cm2. Cutting it into 8 x 1cm cubes means it now has a surface area of 1 x 1 x 6 x 8 = 48cm2
How does surface area affect the rate of reaction?
This is because there will be more reactant particles per unit volume, causing more frequent collisions so there are more successful collisions per second, increasing the rate of reaction A single 2 cm length cube has a surface area of 2 x 2 x 6 = 24cm2.