Elements, Molecules, Compounds, & Mixtures

Molecule
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Terms in this set (27)
Molecule
A group of two or more atoms bonded together by forces called chemical bonds
Image: Molecule
Compound
A substance made up of atoms of two or more different elements join chemically
Image: Compound
chemical formula
a group of chemical symbols and numbers that show the number of atoms of each element in a molecule
Image: chemical formula
Subscript
A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.
Image: Subscript
Coefficient
A number in front of a chemical formula in an equation that indicates how many of that particular molecule or atom
Image: Coefficient
crystal
a substance in which the particles are arranged in an orderly, geometric, repeating pattern (ex: salt, sugar)
Image: crystal
Mixture
A combination of two or more substances that are combined physically but NOT chemically (can be separated)
Image: Mixture
heterogeneous mixture
A mixture that is not uniform in composition; components are not evenly distributed throughout the mixture (ex: Chex Mix)
Image: heterogeneous mixture
homogeneous mixture
a mixture that is uniform in composition; components are evenly distributed and not easily distinguished (ex: hot chocolate)
Image: homogeneous mixture
Solution
homogeneous mixture, usually a liquid, in which one substance is completely dissolved in another substance.
Image: Solution
Solutethe substance that is dissolvedsolventA liquid substance capable of dissolving other substancesSiftingTo pass dry ingredients through a mesh screen to separate or to combine ingredientsFiltrationA process that separates materials based on the size of their particles.EvaporationThe change of state from a liquid to a gasChemical PropertyA characteristic of a pure substance that describes its ability to change into different substancesstates of matterthe physical forms of matter, which include solid, liquid, and gasmelting pointthe temperature at which a substance changes from a solid to a liquidboiling pointthe temperature at which a substance changes from a liquid to a gaschemical changeA change that occurs when one or more substances change into entirely new substances with different properties.physical changea change of matter from one form to another without a change in chemical propertiesPercipitateA solid that forms from a solution during a chemical reaction.Densitythe degree of compactness of a substance; mass per unit volume (mass/volume)Solubilitythe ability of one substance to dissolve in another at a given temperature and pressureproductA substance produced in a chemical reactionReactanta substance that takes part in and undergoes change during a reactionLaw of Conservation of MassMatter is not created nor destroyed in any chemical or physical change

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