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Chemistr Definitions

All the definitions from grade 9 chemistry

TermDefinition
Matter anything that has mass and takes up space
pure substance matter that contains only one kind of particle
mixture matter that contains more than one kind of particle
element a pure substance that cannot be broken down into simpler parts by chemical methods
compound a pure substance made of two or more different elements that are chemically combined
physical property a characteristic of a substance that can be observed and measured without changing the identity of the substance
viscosity the measure of a substance's ability to flow
melting point the temperature at which a solid turns into a liquid
boiling point the temperature at which a liquid turns into a gas
solubility a measure of the ability of a substance to dissolve in another substance
density the ratio of the mass of a substance the volume it occupies
chemical property the ability of a substance to change (react) and form a new substance
combustibility the ability of a substance to burn in air
stability the ability of a substance to remain uncharged
toxicity the ability of a substance to cause harmful effects in plants and animals
atom the smallest particle of an element that retains the identity of the element.
electron a negatively charged particle within the atom
subatomic particle a particle that is smaller than the atom
nucleus in chemistry, the positively charged centre of an atom.
proton a positively charged particle that is part of every atomic nucleus
neutron an uncharged particle that is part of almost every atomic nucleus
atomic number the number of protons in the nucleus of an atom
mass number the sum of the number of protons and the number of neutrons in the nucleus of an atom
isotope one of two or more forms of an element that have the same number of protons but a different number of neutrons
atomic mass the average mass of the naturally occurring isotopes of an element
periodic table a system for organizing the elements into columns and rows, so that elements with similar properties are in the same column
metal typically, an element that is hard, shiny, malleable, and ductile, and is a good conductor of heat and electricity.
non-metal typically, and element that is not shiny, malleable or ductile and is a poor conductor of heat and electricity
metalloid an element that shares some properties with metals and some properties with non-metals
period a horizontal row of elements in the periodic table
group a vertical column of elements in the periodic table
valence electron an electron in the outermost occupied energy level of an atom.
ion a positively or negatively charged atom or molecule
chemical bond a chemical link between two atoms, which holds the atoms together
ionic bond a chemical bond that forms between oppositely charged ions
ionic compound a compound made of oppositely charged ions
molecular compound a compound formed when atoms of two or more different elements share electrons
covalent bond a chemical bond in which one or more pairs of electrons are shared by two atoms
molecule the smallest discrete particle of a pure substance, which has one or more shared pairs of electrons
Created by: caitlynkummer