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7th Grade Chemistry
Strand 1
| Term | Definition |
|---|---|
| agitation | the act or an instance of agitating something; a moving back and forth or with an irregular, rapid, or violent action such as rapid shaking or stirring |
| aqueous solution | solution that occurs when a solid, liquid, or gaseous substance (solute) is evenly distributed within water (solvent) |
| chemical change | one substance is transformed into one or more new products via a chemical reaction |
| concentration | the amount of solute dissolved in a given volume of solvent |
| dilution | the process of decreasing the concentration of a solute in a solution |
| physical change | a change in appearance only and does not impact the identity of a substance |
| rate of dissolution | a measure of how fast a solute dissolves into a solvent to form a solution |
| solubility | the maximum amount of solute that can dissolve in a solvent |
| solute | the part of a solution in the smaller quantity, often the solid or gas dissolved into a liquid |
| solution | a substance in which a solid, liquid, or gaseous substance is evenly distributed (or dissolved) within a liquid or sometimes a gas or solid |
| solvent | the (often liquid) portion of a solution that is in the greater proportion into which the solvent is evenly distributed |
| corrosive | materials that can attack and destroy, by chemical action, living tissue, organic compounds and metal |
| dissolve | when a solid substance mixes into a liquid and seems to vanish, creating a solution |
| heterogeneous mixture | a material which consists of multiple different substances that are not evenly distributed; each sample of the mixture may have different proportions of the individual components |
| homogeneous mixture | a material which consists of multiple different substances that are evenly distributed; each sample of the mixture will have the same proportion of the individual components |
| surface area | the number of square units necessary to cover the surface of a three-dimensional object without gaps or overlaps |
| temperature | the measure of the average kinetic energy of the particles within a substance; a measure of heat energy; measured in degrees Celcius |
| atom | the smallest particle of matter that has distinct physical and chemical properties; |
| chemical formula | the unique combination of chemical symbols and subscripts that describe which and how many of each element are bonded together in a compound |
| chemical symbol | a notation of one or two letters representing a chemical element |
| compound | a pure substance that is made up of two or more different elements in a specific ratio |
| element | a pure substance that is made up of one type of atom |
| molecule | a group of atoms that are chemically bonded to each other |
| coefficient | a number placed in front of a chemical formula to show how many molecules or moles |
| ratio | the fixed proportion of elements—measured by the number of atoms or by mass—that combine to form a compound |
| subscript | a small number written slightly below and to the right of a chemical symbol that indicates how many atoms of that element are present |
| density | a physical property that measures how tightly packed the particles of a substance are compared to the volume of the substance; the relationship between mass and volume |
| kinetic energy | the energy caused by the motion of objects or particles within a system |
| pure substance | material that is made of a single element or compound; every particle of a substance is the same type of atom or molecule |
Created by:
SGwartney