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Jun 30, 2019 · Very simple chemical processes were performed even during ancient history, at 1000 BC, much before any basic chemistry concepts or laws were actually established. Extraction of metals from ore or getting compounds out of natural sources such as plants, are examples of chemistry that was first performed thousands of years ago and are still a thing today.
Oct 27, 2024 · The definition of the term substance is an example of how chemistry has a specific definition for a word that is used in everyday language with a different, vaguer definition. Here, we will use the term substance with its strict chemical definition. Chemistry recognizes two different types of substances: elements and compounds.
Feb 20, 2022 · 4.4: Chemical Equations and Stoichiometry A chemical equation expresses the net change in composition associated with a chemical reaction by showing the number of moles of reactants and products. But because each component has its own molar mass, equations also implicitly define the way in which the masses of products and reactants are related.
Jul 15, 2024 · It's possible to learn the basic concepts of chemistry online. Chemistry concepts should be studied in a logical order because concepts build upon each other. Jumping into the middle of the science can lead to confusion. While it's fine to learn chemistry principles online, be aware that the lab component is an important part of the science.
- Anne Marie Helmenstine, Ph.D.
Jun 18, 2024 · These can be broken down into their constituent atoms. In chemical reactions the atoms of the reactants interact to form new substances. The reacting species are called reactants, and those produced are products. Reactant and products can be either elements or compounds. Compounds are held together by chemical bonds. 1A.6: Physical Properties
Feb 18, 2022 · Chemistry is a physical science that focuses on the study of substances (chemical elements and compounds), their properties, behaviours, structures and applications. While ancient civilisations had some inkling about the differences between elements and compounds, the real science of chemistry began as a product of the Age of Enlightenment.
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In chemistry these problems may seen less extreme than in biology, or physics, where most of the key concepts are blighted by having labels which are also used in more vague everyday senses, but we may still find students using words like ’natural’, ‘synthetic’, ‘metal’ ’pure’ and ’substance’ in ways which do not match the technical meanings.
