Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals as well as medications, so the importance of chemistry is that it's the study of everything.
List of Chemicals used in daily life
| S:No | Common name of the Chemical | Molecular Formula and IUPAC name |
|---|
| 3 | Detergent | Sodium sulphate, sodium hydroxide and phosphatecompounds |
| 4 | Toothpaste | Calciuym carbonate, sodium flouride |
| 5 | Salt | NaCl; Sodium Chloride |
| 6 | Vinegar | C2H4O2 acetic acid, ethanoic acid |
Everything you can breathe, see, ingest or touch is made up of chemicals. All matter, including us, is made of chemicals. Chemistry is the study of the composition, structure, properties and reactions of matter. This includes the whole Earth – all matter in it and on it is made of chemicals.
Chemicals can be toxic because they can harm us when they enter or contact the body. Exposure to a toxic substance such as gasoline can affect your health.
Chemicals can move through air, soil, and water. The different ways a person can come into contact with hazardous chemicals are called exposure pathways. There are three basic exposure pathways: inhalation, ingestion, and skin contact. Inhalation is breathing or inhaling into the lungs.
Chemicals ensure that we have heat and power; that we can buy goods and clothing; and that we have continual access to telecommunication, media and music wherever we are.
Chemists investigate the properties of matter at the level of atoms and molecules. They measure proportions and reaction rates in order to understand unfamiliar substances and how they behave, or to create new compounds for use in a variety of practical applications.
In the context of relationships, chemistry is a simple "emotion" that two people get when they share a special connection. It is the impulse making one think "I need to see this [other] person again" - that feeling of "we click".
Unit: Some basic concepts of chemistry
- Importance of chemistry.
- Uncertainty in measurement.
- Law of chemical combination.
- Atomic and molecular masses.
- Mole concept, molar mass, & percentage composition.
- Stoichiometry.
- Reactions in solution.
However, by performing experiments and recording the results, alchemists set the stage for modern chemistry. The distinction began to emerge when a clear differentiation was made between chemistry and alchemy by Robert Boyle in his work The Sceptical Chymist (1661).
Traditionally, chemistry has been broken into five main subdisciplines: Organic, Analytical, Physical, Inorganic and Biochemistry.
A chemist (from Greek chēm(ía) alchemy; replacing chymist from Medieval Latin alchimista) is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully measure substance proportions, chemical reaction rates, and other chemical properties.
AP®?/College ChemistryAn introductory college-level chemistry course that explores topics such as atoms, compounds, and ions; chemical reactions and stoichiometry; ideal gases; chemical equilibrium; acids and bases; kinetics; thermodynamics; redox reactions and electrochemistry; and a whole lot more!
Physical chemistry, Branch of chemistry concerned with interactions and transformations of materials. Subdisciplines of physical chemistry include electrochemistry, photochemistry (see photochemical reaction), surface chemistry, and catalysis.
Chemistry can help us to understand, monitor, protect and improve the environment around us. Chemists are developing tools and techniques to make sure that we can see and measure air and water pollution. They have helped to build the evidence that shows how our climate has changed over time.
Chemistry is the study of matter, its composition and the changes it undergoes.
Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.
Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Products are the species formed from chemical reactions. During a chemical reaction reactants are transformed into products after passing through a high energy transition state.
