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What do you think when you hear the word chemistry? Well, in everyday life, chemistry is often identified with something that is scary or terrible. For example, it is identified with the use of dangerous substances, poisoning or killing, and must be avoided. But, do you know that chemistry is actually very close and useful in life?

Well, there are many events that are very related to chemistry. For example, the events of iron ore, the processing of oil, the smelting of gold, and the oxygen that we inhale during the breathing process are also very related to chemistry.

In addition, there are many useful things that are obtained from the application of chemical science. For example soap, detergent, powder, paint, fuel such as LPG, batteries, hand sanitizer, etc. Then, what is actually meant by chemical science? Well, chemical science is a science that learns about the arrangement of matter,

material structure, material nature, material and energy changes that include the changes. Well, let's discuss one by one. The first is the arrangement of matter. In chemistry, we will learn the arrangement of matter that comprises the components of the arrangement of matter and the comparison of each component.

In this matter, matter can be a single and mixed substance. Single substances are substances that only consist of one type of matter, where we can divide this single substance into elements and substances. The element is a chemical substance that cannot be divided into a simpler substance.

There are two types of elements in chemistry, namely metal elements, for example iron, gold, and copper, then non-metal elements, for example oxygen, hydrogen, and nitrogen. There is also a substance that is a single substance that is formed from the combination of several elements.

For example, water is a single substance that is formed from a combination of two hydrogen elements and one oxygen element, where the chemical formula is H2O. Another example is sodium chloride salt, which is formed from a combination of one sodium element and one chlorine element, with the chemical formula being NaCl.

The next mixture is a combination of two or more substances. In chemistry, the mixture is divided into three, namely the homogeneous mixture, the heterogeneous mixture, and the colloid. The homogeneous mixture is a mixture of two or more substances that can be perfectly mixed, so that we can no longer differentiate which substance is one and the other.

For example, the mixture of water and sugar that forms a sugar solution. Well, before mixing, we can clearly differentiate water and sugar because water is liquid and sugar is solid. However, when mixed, sugar will be perfectly mixed with water. Another example is the mixture of water and syrup as well as water and salt.

Next, the heterogeneous mixture is a mixture of two or more substances that are not completely mixed, so after mixing, we can still differentiate each substance in a rough way. For example, the mixture between water and sand, as well as the mixture between water and oil. Well, for these two mixtures, we can still differentiate the water and the sand,

as well as water and oil Although water and oil both form liquid, but both are still not perfectly mixed There is also for colloid, which is a mixture that is almost homogeneous but microscopically appears to be heterogeneous The examples are coconut milk and milk Next we continue to the structure of matter

In chemistry, we will learn the structure of matter that forms the structure of particles or how elements can bind to form a substance. For example, water that contains the chemical H2O. In chemistry, we will learn that H2O is made up of two hydrogen and one oxygen through a chemical bond called the covalent bond.

Different from sodium chloride salt which is formed through ionic bonds Then in chemistry we also learn the nature of matter Where the nature of matter is divided into two, namely the physical nature and the chemical nature Well, the physical nature is the nature of a matter that can cause physical changes

For example, color, point of boiling, point of melting, the hardness of a material and the electric current. So in chemistry, later we will learn why metal can conduct electric current, while wood cannot conduct electric current. Well, there is also the nature of chemistry, which is the nature of a material that can cause chemical changes.

For example, the reactivity of a material, the strength of an oxidizer, and the strength of a reducer of a material. So, in chemistry, we will later learn why iron can rust and how to avoid its rust.

Next in chemistry we also learn about matter changes where matter changes are divided into two, namely physical changes and chemical changes. For physical changes, they are the changes in matter that are not included in the formation of new substances. For example, the evaporation of water, where in this process there is a change in the water from liquid to gas.

The second example is the process of composting. In this process, there is a change in the substance from gas to liquid. The next example is the process of making a table out of wood. In this process, woodworkers change wood from trees to tables. This is one example of a physical change.

Another example is the process of grinding coffee. In this process, coffee was initially dense and after grinding it became smaller, i.e. it became a paste. The next chemical change is a change in matter accompanied by the formation of new substances.

For example, paper burning In this process, new substances that we can observe in the form of ash and gases produced or smoke that we can see Another example is the process of ironing, food poisoning, and food fermentation Next in chemistry we will also learn about energy such as heat energy or heat energy

For example, we will learn that in the process of burning paper, there is a release of heat from the system towards the environment Another example is the process of boiling water. To boil, water must absorb heat energy from the environment, so we have to light a stove as an energy source that will be absorbed by water

So there are many things that we will learn through chemistry which of course is very closely related to life As mentioned earlier, chemistry plays a very important role in everyday life In the field of agriculture, chemistry is used to make fertilizer and pesticides

In the field of pharmacy, chemical science is used to synthesize drugs and vaccines In the field of medicine, chemical science has the role for example for analysis For example when analyzing blood samples or analyzing urine samples from patients Next in the field of agriculture, chemical science can be used to develop the hormone that nourishes livestock

the processing of livestock intestines into fertilizer and the process of producing livestock feed. Next in the field of geology, we can use chemistry to determine the elements that arrange a mineral, for example those found in rocks. Well, the discovery of elements found in a mineral can be used more continuously to make or synthesize beneficial substances in life.

Then in the industry, chemistry also plays a role, for example, it can be used for making machines that require metal with certain characteristics, painting, cement, concrete, etc.

In addition, chemistry can also be used in the field of beauty For example, the principles of chemistry are used in the process of making powder, soap, nail polish, and cleaning