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Unit 01 24-25

Elements and Compounds

TermDefinition
Atom the smallest particle of an element
Chemical formula represents the type and number of atoms present in a particular substance
Chemical symbol one or two letters representing a chemical element
Compound composed of two or more different elements that are chemically combined
Element a pure substance composed of the same type of atom throughout
Molecule – refers to the simplest unit of a chemical compound that can exist; formed when two or more atoms combine chemically
Mixtures mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup.
Particle a minute (very small) portion of matter.
Periodic Table of Elements organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic number.
Pure substance a single kind of matter that cannot be separated into other kinds of matter by any physical means.
Ratio the quantitative relation between two amounts showing the number of times one value contains or is contained within the other.
Solution a liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent).
Subscript a small-sized number on the bottom right of the symbol. It refers to the number of atoms of the element.
Coefficient The numbers placed in front of formulas to balance equations that multiply all the atoms in a formula.
Created by: LMS 7 Sci
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