Understanding Reaction Rate
Reaction Rate: Understanding, Factors That Influence, And Formulas With Examples of Complete Problems
The concept of learning chemistry is a concept that is closely related to daily life. Chemistry describes life in such a way that it looks more detailed and diverse. This is what makes teachers apply the concept of chemistry to everyday life by presenting it in simple examples. In addition, an introduction to the concepts that are often used in the wider world, even simple habits that we often do without knowing it is a chemical concept.
One example is the concept of reaction rates in chemistry. In chemistry it is explained that the rate of reaction is the magnitude of change in the number of reactants and reaction results per unit of time. This change can be said to be a change in molar concentration (molarity) so that the rate of reaction can be said to be a change in the final concentration (reaction product) to the initial concentration (reagent) per unit time.
There are so many concepts of reaction rates that we find in everyday life. Therefore, this paper will explain in detail the benefits of reaction rates in everyday life.
Reaction Rate Formula Example Questions
Understanding Reaction Rate
The reaction rate is the rate of decrease in reactants (reagents) or the rate of increase in products (reaction products). This reaction rate also describes the speed of a chemical reaction, while the chemical reaction is the process of changing a substance (reagent) into a new substance called a product.
Some chemical reactions exist that take place quickly. Sodium added to the water will show a severe and very fast reaction, as will firecrackers and fireworks. Gasoline will burn faster than kerosene. However, there are also reactions that run slowly. The iron rusting process, for example, takes a very long time so the reaction rate is slow.
The slow and slow process of a chemical reaction that takes place is expressed by the rate of the reaction. In studying the reaction rate the concentration of each unit of time is expressed as molarity. What does molarity mean? Check out the following description.
Molarity as a Concentration Unit in the Reaction Rate
Molarity states the number of moles of substance in 1 L of solution, so that the molarity is denoted by M, and is formulated as follows.
M = n / V
Information :
n = number of moles in units of moles or mmol
V = volume in L or Ml units
Benefits of Reaction Rate
in everyday life
By studying the rate of reaction we can know that the reaction can take place influenced by several factors, for example surface area. If we know that the surface area affects the rate of reaction, surely we will reduce the surface area of a substance before processing it.
Some examples of the application of the Reaction Rate in daily life:
The mother at home or the merchant porridge slices the brown sugar first, which will be added to the bean porridge.
Rural residents split logs into several sections before being put into a furnace.
Gado-gado, lontong, and pecel sellers grind fried peanuts before mixing with other ingredients.
In making paper, the raw material for making paper is crushed first to make pulp. In order to expand the surface of the touch area so that the mixture becomes homogeneous and the reaction is perfect.
Raw materials which are often mined, are available in the form of coarse grains. To speed up further processing, the granules are crushed until smooth.
In making bread we can add yeast which serves as a catalyst to speed up the reaction rate.
Reaction Rate Factor
Factors that influence it include:
1. Concentration of reactants
The higher the reactant concentration, the more the number of reactant particles that collide, so the higher the frequency of collisions and the rate of increase. For example, in the iron corrosion reaction in air, the rate of iron corrosion reaction is higher in air with higher humidity (high H2O reactant concentration)
2. Temperature
Temperature also plays a role in influencing the reaction rate. If the temperature of a reaction that is continuously raised, it causes the particles to move more actively, so that collisions occur more frequently, causing the reaction rate to increase. Conversely, if the temperature is lowered, the particles will become less active, so the reaction rate will be smaller.
3. Pressure
Many reactions involve reagents in the form of gases. The speed of such reagents is also influenced by pressure. Adding pressure by decreasing the volume will increase the concentration, thereby increasing the rate of reaction.
4. The existence of a catalyst
A catalyst is a substance which accelerates the rate of chemical reactions at a certain temperature, without undergoing changes or being used by the reaction itself. A catalyst plays a role in a reaction but not as a reactant or product. The catalyst allows the reaction to take place more quickly or allows the reaction to be at a lower temperature due to the changes it triggers on the reactant. The catalyst provides a preferred pathway with lower activation energy. Catalyst reduced energy needed for reaction.
5. Touch Surface Area
Touch surface area has a very important role in the rate of reaction, because the greater the surface area of the touch area between particles, the collisions that occur more and more, thus causing the reaction rate to be faster.
Likewise, the smaller the surface area of the touch area, the smaller the collisions that occur between particles, so the reaction rate gets smaller. Characteristics of the pieces that are reacted also influence, namely the finer the pieces, the faster the time needed to react; while the coarser the pieces, the longer it takes to react.