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Chemistry Unit Vocabulary Words
Terms in this set (49)
Anything that has mass and takes up space.
Physical Properties of Matter
A characteristic of a pure substance that can be observed without changing it into another substance.
-State of Matter
-Boiling point and Melting point
he amount of mass (stuff) inside of a given volume (space). Density = Mass/Volume
The amount of space that an object occupies.
The measurement of the amount of matter in an object.
The temperature at which a liquid boils and becomes vapor.
The temperature at which a solid becomes a liquid.
States of Matter
Solid, Liquid, and Gas
Molecules close together
Speed of molecules: Slow
Molecules not a closely packed together as solids.
Speed of Molecules: Medium
Molecules far apart
Speed of molecules: Fast
the liquid in which a solute is dissolved to form a solution.
chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent
A substance that is dissolved in another substance (a solvent), forming a solution
changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.
Chemical Properties of Matter
A characteristic of a pure substance that describes its ability to change into different substances.
any change that results in the formation of new chemical substances. At the molecular level, the variety of circumstances (conditions that include temperature, pressure, presence of catalysts) in which it reacts, in combination with the: Variety of substances with which it reacts. chemical change involves making or breaking of bonds between atoms. These changes are chemical: iron rusting (iron oxide forms) gasoline burning (water vapor and carbon dioxide form)
the variety of circumstances (conditions that include temperature, pressure, presence of catalysts) in which it reacts, in combination with the: Variety of substances with which it reacts.
is a numeric scale used to specify the acidity or basicity of an aqueous solution.
The breaking down or destruction of a material, especially a metal, through chemical reactions.
combine or become combined chemically with oxygen.
characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants.
any change that results in the formation of new chemical substance
lasting attraction between atoms that enables the formation of chemical compounds
cause (a substance) to be deposited in solid form from a solution.
eaction with the absorption of heat
reaction with the release of heat.
one single atom (pure substance)
two or more different atoms chemically bonded together. (pure substance)
contains two or more substances (elements, lattices, molecules, compounds), that are not chemically bonded together
a combination of two or more pure substances in which the original substances retain their chemical properties
A mixture which has uniform composition and properties throughout
chemical substance is a material that has constant composition (is homogeneous) and has consistent properties throughout the sample. (compounds and elements)
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound
arrange thing in classes or categories according to shared qualities or characteristics.
The smallest piece of matter. The "building blocks of matter".
Periodic Table of Elements
a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
An atom that does not have a charge.
The center of an atom.
The positively charged particles in the nucleus of an atom.
The neutral (no charge) particles in the nucleus of an atom.
The negatively charged particles that orbit around the nucleus.
(also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table, but the f-block columns (between groups 2 and 3) are not numbered.
A period is one of the horizontal rows in the periodic table, all of whose elements have the same number of electron shells
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g., iron, gold, silver, copper, and aluminum, and alloys such as brass and steel).
an element or substance that is not a metal.
an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors.