“So that’s what stuff is.” That’s an important thought to have cross your mind at least a few times throughout your life. Don’t underestimate young children’s ability to grasp many basic chemistry concepts, either; the earlier you start, the less intimidated they’ll be by one of the most straightforward school subjects there is: science.
Basic Chemistry Knowledge Checklist
Chemistry: The science of what stuff is made of
Chemical: Any kind of matter with constant properties that can’t be broken into its component elements without breaking its chemical bonds
Atom: Tiny part of matter. It has a nucleus with protons and neutrons inside it and electrons moving around it. These parts are held together by electrical charges. Positive parts (protons) attract negative parts (electrons) and neutrons have no charge. Most of each atom, though, is empty space. Quarks are what make up protons and neutrons. A sheet of paper is probably one million atoms thick.
Matter: All stuff, visible and invisible
Parts of an atom (subatomic particles): Protons, neutrons and electrons
Three states of matter: Solid, liquid and gas. You can’t compress liquids or solids, but you can compress a gas. (You can flatten a solid, but the mass remains the same). This is because there is space between the particles in gas, and because there’s no bonding/attraction between the particles in gases. Note, though, that there are limits as to how much you can compress a gas. Do it enough and you turn it into a liquid (like liquid nitrogen).
Solid: State of matter with definite shape and volume
Liquid: State of matter with definite volume, varying shape
Gas: State of matter with no definite shape or volume
Molecule: Group of atoms that stick (bond) together and aren’t easily broken (until there is a chemical change). Fundamental particles. When molecules are messed with, the matter they make up might change state.
Element: A substance that contains only one kind of atom. (If the atoms are bonded in a different way, though, the element is an isotope.)
Particle: A bit of something that is still the original thing and not something else
Compound: A material that contains two or more elements that are chemically bonded together. The atoms of the elements can’t be separated by physical means and the end product has different properties from the original elements. Example: Cake.
Periodic Table of the Elements: A visual arrangement of the elements organized by their atomic number.
Atomic number: The number of protons (and also the number of electrons) in the atom, which indicates its substance
Mass number: The total number of protons and neutrons
Mixture: Ingredients mixed together but not chemically bonded. Can be separated again. Example: Air. Another example: The ingredients in a cake that are mixed together before being heated and formed into a cake.
Chemical bonding: The joining of atoms to create molecules. Atoms share electrons to form molecules. They do this to fill their outer shell and thus become more stable.
Chemical reaction: When the atoms in substance(s) rearrange to form new substances. Example: Baking a cake. Heat and electricity are often used to break the bonds.
Isotope: A different form of the same atom, with different number of neutrons. It has different physical properties but chemically it is the same.
Chemical symbol: The letters that represent the atoms of a particular element
Chemical formula: CO2, H2O, etc.
Ion: An unstable atom or molecule whose net charge is either less than or greater than zero
Enzymes: Catalysts that speed up chemical reactions in living things
Covalent bond: A chemical bond formed when atoms share electrons. Each atom still has its proper total number, but some of its electrons are attracted to the other atoms and stick there. Most non-metal elements are formed with covalent bonds.
Double bond: A chemical bond formed when atoms share two electrons each with each other
Ionic bond: A chemical bond formed when an atom gains or loses electrons
Metallic bond: A chemical bond between metals where free electrons travel between them
Electrolysis: Separating individual elements in a compound by passing an electric current through it when it is molten or in a solution
Salt: Any metal and non-metal bonded together. Salts have a crystal structure. There are many different kinds, not just table salt.
Organic compounds: Compounds that include carbon. All living things contain organic compounds, and many can be made artificially. They are used to create fabrics, medicines, plastics, paints, cosmetics and more.
Alcohol: Organic compounds that contain carbon, oxygen and hydrogen
Fermentation: A chemical reaction that produces alcoholic drinks. It is caused by fungi, which produce enzymes.
Semiconductor: A semi-metal element
Main metals (all those used in manufacturing): aluminum, brass, bronze, calcium, chromium, copper, cupronickel, gold, iron, lead, magnesium, mercury, platinum, plutonium, potassium, silver, sodium
Main alloys: Solder, steel, tin, titanium, tungsten, uranium, vanadium, zinc
Crude oil: The raw material from which fuels like oil, fuel, gas are obtained. It is a fossil fuel that is often found in rock reservoirs under the seabed.
Plastic: An easily-molded synthetic polymers made from the organic compounds found in crude oil.
Polymer: A substance made of many small molecules joined together to make long chains. Some are synthetic (nylon), while others are natural (hair, rubber, wool, silk, etc.).
Carbon monoxide: A poisonous gas formed when fuels burn in a place with limited air (oxygen), such as an engine.
Oxygen: The element that helps plants and animals release energy from food. In the human body it is one of the most important things the blood sends the cell. As blood flows over body cells, oxygen and other nutrients are “let in” and waste products are deposited into the blood. It is the third most abundant element in the universe.
Hydrogen: An element that can form compounds with most other elements. Water is formed when hydrogen is burned in air. It is the most abundant element in the universe. (Helium is the second.)
Carbon: The element that occurs in all known organic life. It is the fourth most abundant element in the universe and is found in more compounds than any other element.
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