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Chemistry Definitions
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109
Chemistry
10th Grade
10/21/2012

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Term
What does WHIMIS stand for ?
Definition
Workplace Hazardous Materials Information System
Term
Workplace Hazardous Materials Information System (WHIMIS)
Definition
System of easy-to-see warning symbols on hazardous materials, designed to help protect people who use hazardous materials at work.
Term
What does MSDS stand for ?
Definition
Material Safety Data Sheets.
Term
Material Safety Data Sheets (MSDS) -
Definition
Information sheet on a hazardous product used in workplaces, including schools; identifies the chemical and physical hazards associated with the product.
Term
Physical Properties
Definition
Properties that describe the physical appearance and composition of a substance.
Term
Chemical Properties
Definition
Properties that describe the reactivity of a substance.
Term
Pure Substances
Definition
Substances in which all the particles are identical.
Term
Element
Definition
Pure substance that cannot be broken down into other substances; substances made up of only one atom.
Term
Compound
Definition
Chemical combination of two or more elements in a specific ratio.
Term
Mixture
Definition
Combination of pure substances.
Term
Mechanical Mixture
Definition
Mixture in which the different substances are visible.
Term
Heterogeneous Mixture
Definition
Mixture in which the different substances are visible.
Term
Homogeneous Mixture
Definition
Mixture in which the different substances are not visible.
Term
Suspension
Definition
Mechanical mixture in which the components are in different states.
Term
Colloid
Definition
Mechanical mixture in which the suspended substance cannot be easily separated from the other substances in the mixture.
Term
Solution
Definition
Mixture in which the separate components are not visible.
Term
Chemical Reaction
Definition
Process that occurs when a substance or substances react to form a different substance or substances.
Term
Physical Change
Definition
Change to a substance in which the composition of a substance stays the same.
Term
Chemical Change
Definition
Change to a substance that always results in the formation of a different substance or substances.
Term
Salting
Definition
Method of drying food to preserve it; salt draws water out of the food.
Term
Fermentation
Definition
Biochemical preservation technique involving bacteria.
Term
Atom
Definition
Smallest part of an element that still has the properties of the element.
Term
Law of Conservation of Mass
Definition
Total mass of the reactants in a chemical reaction equals the total mass of the products.
Term
Electron
Definition
Negatively charged particle in the atom that occupies energy levels around the nucleus.
Term
Nucleus (In Atoms)
Definition
Positively charged centre of the atom made up of protons and neutrons.
Term
Nucleon
Definition
Subatomic particles in the nucleus of the atom; protons and neutrons.
Term
Proton
Definition
Positively charged particle in the nucleus of an atom.
Term
Neutron
Definition
Neutral particle in the nucleus of an atom.
Term
Metal
Definition
Shiny, malleable, ductile element.
Term
Ductile
Definition
Description of a substance that can be drawn or stretched into long wires.
Term
Inert
Definition
Unreactive with all but the most corrosive of acids.
Term
Non-Metal
Definition
One of the 17 elements with varying properties that are completely different from metals.
Term
Molecule
Definition
Group of non-metallic atoms bound together by covalent bonds; can be made up of atoms of the same element or atoms of different elements.
Term
Metalloid
Definition
Element with properties intermediate between metals and non-metals.
Term
Period
Definition
Horizontal line or row in the periodic table; numbered 1-7.
Term
Group
Definition
Vertical column of elements in the periodic table; numbered from 1-18; also called family.
Term
Family
Definition
Vertical column of elements in the periodic table; numbered from 1-18; also called group.
Term
Alkali Metals
Definition
Soft, shiny, silvery elements, very reactive with water; group 1 in the periodic table.
Term
Alkaline-Earth Metals
Definition
Shiny, silvery metals, not as soft as the alkali metals; group 2 in the periodic table.
Term
Noble Gases
Definition
Extremely unreactive non-metals; group 18 in the periodic table.
Term
Halogens
Definition
Non-metals in group 17 in the periodic table; fluorine, chlorine, bromine, and iodine.
Term
Salts
Definition
Compound produced in a neutralization reaction between an acid and a base.
Term
Atom
Definition
Smallest part of an element that still has the properties of the element.
Term
Energy Level
Definition
Region of space near an atom's nucleus that may be empty or may contain electrons; electrons in energy levels nearest the nucleus have the lowest energy.
Term
Atomic Number
Definition
Number of protons in an atom; can be used to specify an element.
Term
Isotopes
Definition
Atoms of the same element containing different numbers of neutrons.
Term
Mass Number
Definition
Integer equal to the toal number of protons and neutrons in the nucleus of an atom.
Term
Atomic Molar Mass
Definition
Average molar mass of an element's atoms, including those of all the element's different isotopes.
Term
Ionization
Definition
Process of an atom gaining or losing electrons.
Term
Ion
Definition
Electrically charged atom or group of atoms.
Term
Cations
Definition
Positively charged ion.
Term
Anions
Definition
Negatively charged ion.
Term
Valence Electrons
Definition
Electron in the outermost energy level of an atom.
Term
Valence
Definition
Tendency of an atom to gain or lose electrons.
Term
Valence Number
Definition
Number of electrons an element can gain or lose to combine with other elements.
Term
Atomic Number
Definition
Number of protons in an atom; can be used to specify an element.
Term
Isotopes
Definition
Atoms of the same element containing different numbers of neutrons.
Term
Mass Number
Definition
Integer equal to the toal number of protons and neutrons in the nucleus of an atom.
Term
Atomic Molar Mass
Definition
Average molar mass of an element's atoms, including those of all the element's different isotopes.
Term
Ionization
Definition
Process of an atom gaining or losing electrons.
Term
Ion
Definition
Electrically charged atom or group of atoms.
Term
Cations
Definition
Positively charged ion.
Term
Anions
Definition
Negatively charged ion.
Term
Valence Electrons
Definition
Electron in the outermost energy level of an atom.
Term
Valence
Definition
Tendency of an atom to gain or lose electrons.
Term
Valence Number
Definition
Number of electrons an element can gain or lose to combine with other elements.
Term
Octet Rule
Definition
Atoms bond in such a way as to have eight electrons in the valence energy level; also called the rule of eight.
Term
Another name for Octet Rule.
Definition
Another name for Rule of Eight.
Term
Crystal Lattice
Definition
Organized array of ions.
Term
Formula Unit
Definition
Smallest amount of an ionic compound with the composition shown by the chemical formula; number of positive and negative ions in the smallest whole-number ratio that results in a neutral unit in the crystal lattice of a compound.
Term
Ionic Bond
Definition
Type of bond formed when electrons transfer between metals and non-metals.
Term
Multivalent Element
Definition
Element with more than one stable ion.
Term
Polyatomic Ion
Definition
Charged particle made up of several non-matallic atoms joined together.
Term
Covalent Bond
Definition
Bond formed when non-metallic atoms share electrons; atoms in a molecule are bound together by covalent bonds.
Term
Molecule
Definition
Group of non-metallic atoms bound together by covalent bonds; can be made up of atoms of the same element or atoms of different elements.
Term
Molecular Element
Definition
Element that forms molecules made up of only of its own atoms.
Term
Diatomic Molecule
Definition
Molecule composed of two atoms of the same element.
Term
Polar
Definition
Description of an object that has a positive electric charge at one end and a negative charge at the other; water molecules are slightly _____.
Term
Electrolyte
Definition
Solution that conducts electricity; ionic compounds are excellent electrolytes.
Term
Precipitate
Definition
Solid with a low solubility that forms a solution.
Term
Precipitation (In Solutions)
Definition
Process of forming a solid from a solution.
Term
Acid
Definition
Substance that produces hydrogen ions (H+) when disolved in water; compound that dissolves in water to form a solution with a pH lower than 7 (at 25˚C).
Term
Base
Definition
Substance that produces hydroxide ions (OH-) in water; compound that dissolves in water to form a solution with a pH greater than 7 (at 25˚C).
Term
pH
Definition
Measure of the number of hydrogen ions in a solution; indicates how acidic or basic a substance is.
Term
Buffer
Definition
Substance that keeps the pH of a solution nearly constant despite the addition of a small amount of acid or base.
Term
Universal Indicator
Definition
Mixture of several indicators that change colour as the acidity of a solution changes.
Term
Neutral
Definition
Description of a substance that is neither acidic nor basic; solution with a pH of 7 (at 25˚C)
Term
Neutralization
Definition
Process in which acids and bases react with each other so that the H+ ion and OH- ion combine to make a single water molecule; both acidic and basic properties disappear.
Term
Addiction
Definition
Physical dependance on a drug.
Term
Reactant
Definition
Substance that reacts in a chemical reaction to form another substance or substances.
Term
Product
Definition
New substance produced in a chemical reaction.
Term
Exothermic Reactions
Definition
Chemical reaction that releases energy, usually in the form of heat, light or electricity.
Term
Combustion
Definition
Exothermic chemical reaction that occurs when oxygen reacts quickly with a substance to form a new substance or substances.
Term
Endothermic Reaction
Definition
Chemical reaction that absorbs energy.
Term
Law of Conservation of Mass
Definition
Total mass of the reactants in a chemical reaction equals the total mass of the products.
Term
Chemical Equation
Definition
Record of a chemical reaction using chemical symbols and formulas; shorthand way of showing the results of a chemical reaction.
Term
Formula Equation
Definition
Chemical equation that uses the chemical formulas of reactants and products in a chemical equation to represent a chemical reaction.
Term
Skeleton Equation
Definition
Formula equation showing the identify of each substance involved in a chemical reaction; does not show the correct proportions of the reactants and the products.
Term
Formation Reaction
Definition
Chemical reaction in which two elements combine to form a compound; also known as a synthesis reaction.
Term
Synthesis Reaction
Definition
Chemical reaction in which two elements combine to form a compound; also known as a formation reaction.
Term
Skeleton Equation
Definition
Formula equation showing the identify of each substance involved in a chemical reaction; does not show the correct proportions of the reactants and the products.
Term
Decomposition Reaction
Definition
Chemical reactions in which a compound breaks apart into its elements.
Term
Hydrocarbon
Definition
Compound that contains hydrogen and carbon; common hydrocarbons include the main components of gasoline (a mixture of many liquid hydrocarbons) and many plastics.
Term
Single Replacement Reactions
Definition
Chemical reaction in which a reactive element reacts with an ionic compound.
Term
Double Replacement Reactions
Definition
Chemical reaction between two ionic compounds in solution that often results in the formation of at least one precipitate.
Term
Mole
Definition
Quantity that chemists use to measure elements and compounds; symbol: mol; Avogadro's number is the number of particles in a mole.
Term
Avogadro's Number
Definition
Number of atoms in 1 mol; approximately 6.02 X 10^23; symbol: N^^A.
Term
Molar Mass
Definition
Mass od one mole of a substance.
Term
Atomic Molar Mass
Definition
Average molar mass of an element's atoms, including those of all the element's different isotopes.
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