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chemistry01
Term | Definition |
---|---|
matter | Physical substance in general |
elements | a substance consisting of atoms which all have the same number of protons |
compounds | a substance formed when two or more chemical elements are chemically bonded together |
mixtures | A substance made by mixing other substances together |
atoms | The basic unit of a chemical element |
protons | A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge |
neutrons | A subatomic particle of about the same mass as a proton but without an electric charge |
electrons | A stable subatomic particle with a charge of negative electricity, found in all atoms |
nucleus | The positively charged central core of an atom |
atomic mass | The mass of an atom expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom |
periodic table | A table of the chemical elements arranged in order of atomic number |
physical properties | any property used to characterize matter and energy and their interactions |
chemical properties | a property used to characterize materials in reactions that change their identity |
malleability | the property of being physically malleable; the property of something that can be worked or hammered or shaped without breaking. |
ductility | the malleability of something that can be drawn into threads or wires or hammered into thin sheets |
density | Mass per unit volume |
solubility | the quantity of a particular substance that can dissolve in a particular solvent |
chemical formulas | a representation of a substance using symbols for its constituent elements |
homogeneous mixture | A substance that is uniform in composition is a definition |
heterogeneous mixture | a mixture is a material system made up by two or more different substance which are (mixed) together but are not combined |
metals | A solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity. |
nonmetals | not containing or resembling or characteristic of a metal |
metalloids | An element whose properties are intermediate between those of metals and solid nonmetals |
group | A vertical column in the Periodic Table |
period | the term period refers to a horizontal row of the periodic table |
chemical reaction | A process that involves rearrangement of the molecular or ionic structure of a substance |
physical change | a change from one state to another without a change in chemical composition. |
chemical change | any process determined by the atomic and molecular composition and structure of the substances involved |
reactants | A substance that takes part in and undergoes change during a reaction. |
products | A product is a substance that is formed as the result of a chemical reaction. |
law of conservation of matter | a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system |
subscripts | subscripts in chemistry are used in writing formulas. In H2O, the 2 is the subscript. The subscript indicates the number of the preceding element. |
coefficient | a number placed in front of a term in a chemical equation to indicate how many molecules (or atoms) take part in the reaction. |
compound | A thing that is composed of two or more separate elements; a mixture |
solute | The minor component in a solution, dissolved in the solvent. |
solutions | a homogeneous mixture of two or more substances. A solution may exist in any phase. |
substances | all compounds are substances but not all substances are compounds since pure elements are also chemical substances. Chemical compounds may exist as solid, liquid or gas. |