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Matter and Energy

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each of two or more different physical forms in which an element can exist. Graphite, charcoal, and diamond are all allotropes of carbon.



the basic unit of a chemical element.synonyms:grain,iota,jot,whit,mite,scrap,shred,ounce,scintilla,trace,smidgen,modicum"there wasn't an atom of truth in the allegations"

  • atoms as a source of nuclear energy.noun: the atom"the power of the atom"
  • an extremely small amount of a thing or quality."I shall not have one atom of strength left"synonyms:grain, iota, jot, whit, mite, scrap, shred, ounce, scintilla, trace, smidgen, modicum"there wasn't an atom of truth in the allegations"

boiling point

the temperature at which a liquid boils and turns to vapor.

  • the point at which anger or excitement breaks out into violent expression."emotions had reached boiling point and could spill over into violence"


  1. relating to chemistry or the interactions of substances as studied in chemistry."the chemical composition of the atmosphere"


  1. 1.a compound or substance that has been purified or prepared, especially artificially."never mix disinfectant with other chemicals"

chemical change

a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.


chemical property

chemical property. noun. 1. ... a property or characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed: Combustibility is an important chemical property to consider when choosing building materials.


chemical reactions

a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.



  1. a thing that is composed of two or more separate elements; a mixture."the air smelled like a compound of diesel and gasoline fumes"synonyms:amalgam,amalgamation,combination,composite,blend,mixture,mix,fusion,synthesis;alloy"a compound of two elements"


  1. 1.made up or consisting of several parts or elements, in particular.

verb kəmˈpound,ˈkämˌpound/

  1. 1.make up (a composite whole); constitute."a dialect compounded of Spanish and Dutch"
  2. 2.make (something bad) worse; intensify the negative aspects of."I compounded the problem by trying to make wrong things right"synonyms:aggravate, exacerbate, worsen, add to, augment, intensify, heighten, increase, magnify; complicate"his illness compounds their problems"

conservation of matter

he principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed. Expand. Also called law of conservation of mass,conservation of matter



  1. (of a reaction or process) accompanied by or requiring the absorption of heat.
  2. 2.ZOOLOGY(of an animal) dependent on or capable of the internal generation of heat.


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  1. a part or aspect of something abstract, especially one that is essential or characteristic."the death had all the elements of a great tabloid story"synonyms:component,constituent,part,section,portion,piece,segment,bit;More
  2. 2.each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e., the number of protons in the nuclei of its atoms.

freezing point

  1. the temperature at which a liquid turns into a solid when cooled.


diverse in character or content."a large and heterogeneous collection"synonyms:diverse, varied, varying, variegated, miscellaneous, assorted, mixed, sundry, disparate, multifarious, different, differing, motley; More

  • CHEMISTRYof or denoting a process involving substances in different phases (solid, liquid, or gaseous).
  • MATHEMATICSincommensurable through being of different kinds, degrees, or dimensions.


of the same kind; alike."timbermen prefer to deal with homogeneous woods"synonyms:uniform,identical,unvaried,consistent,indistinguishable,homologous,homogenized;More

  • consisting of parts all of the same kind."culturally speaking the farmers constitute an extremely homogeneous group"synonyms:uniform, identical, unvaried, consistent, indistinguishable, homologous, homogenized;More
  • MATHEMATICScontaining terms all of the same degree.


  1. a coherent, typically large body of matter with no definite shape."a mass of curly hair"synonyms:pile, heap; More
  2. 2.the majority of."the great mass of the population had little interest in the project"synonyms:majority,greater part/number,best/better part,major part,bulk,main body,lion's share;most"the mass of our students are licensed drivers"


  1. 1.relating to, done by, or affecting large numbers of people or things."the movie has mass appeal"synonyms:widespread, general, wholesale, universal, large-scale, extensive, pandemic"mass hysteria"


  1. 1.assemble or cause to assemble into a mass or as one body."both countries began massing troops in the region"synonyms:assemble, marshal, gather together, muster, round up, mobilize, rally"they began massing troops in the region"


  1. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy."the structure and properties of matter"
  2. affair or situation under consideration; a topic."a great deal of work was done on this matter"synonyms:affair,business,proceeding,situation,circumstance,event,happening,occurrence,incident,episode,experience;More


  1. of importance; have significance."it doesn't matter what the guests wear"synonyms:importance, consequence, significance, note, import, weight; More
  2. 2.USrare(of a wound) secrete or discharge pus.

melting point

the temperature at which a given solid will melt.



a substance made by mixing other substances together."form the mixture into a manageable dough"synonyms:blend,mix,brew,combination,concoction;More

  • the process of mixing or being mixed.
  • a combination of different qualities, things, or emotions in which the component elements are individually distinct."she thumped the pillow with a mixture of anger and frustration"synonyms:assortment, miscellany, medley, mélange, blend, variety, mixed bag, grab bag, mix, diversity, collection, selection, potpourri, mishmash, ragbag, patchwork, bricolage, farrago, gallimaufry, salmagundi, hodgepodge, hash"a strange mixture of people"


a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.


physical property

A physical property is any property that is measurable, whose value describes a state of a physical system. The changes in the physical properties of a system can be used to describe its transformations or evolutions between its momentary states.Physical properties are often referred to as observables.



  1. an article or substance that is manufactured or refined for sale."marketing products and services"
  2. 2.MATHEMATICSa quantity obtained by multiplying quantities together, or from an analogous algebraic operation.


a substance that takes part in and undergoes change during a reaction.



  1. a book forming part of a work or series.
  2. 2.the amount of space that a substance or object occupies, or that is enclosed within a container, especially when great."the sewer could not cope with the volume of rainwater"synonyms:capacity, cubic measure, size, magnitude, mass, bulk, extent; More


  1. a body's relative mass or the quantity of matter contained by it, giving rise to a downward force; the heaviness of a person or thing."he was at least 175 pounds in weight"synonyms:heaviness,mass,load,burden,pressure,force;More
  2. 2.a heavy object, especially one being lifted or carried.


  1. 1.hold (something) down by placing a heavy object on top of it."a mug half filled with coffee weighted down a stack of papers"
  2. 2.attach importance or value to."speaking, reading, and writing should be weighted equally in the assessment"

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the quality or state of being correct or precise."we have confidence in the accuracy of the statistics"synonyms:correctness,precision,preciseness,exactness,exactitude;More

  • technicalthe degree to which the result of a measurement, calculation, or specification conforms to the correct value or a standard.plural noun: accuracies"the accuracy of radiocarbon dating"synonyms:correctness, precision, preciseness, exactness, exactitude; More


the quality, condition, or fact of being exact and accurate."the deal was planned and executed with military precision"synonyms:exactness,exactitude,accuracy,correctness,preciseness;More

  • marked by or adapted for accuracy and exactness.modifier noun: precision"a precision instrument"
  • technicalrefinement in a measurement, calculation, or specification, especially as represented by the number of digits given.plural noun: precisions"this has brought an unprecedented degree of precision to the business of dating rocks"

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