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9 Chemistry

key terms

TermDefinition
Matter Anything that has mass and occupies space
Physical property A property that can be observed in a substance such as color or state
Chemical property The way a substance reacts with other substances
Physical change A change of the physical property of a substance so no new substance is made
Chemical change When a new substance is made by altering one or more substance
Atom The smallest particle of an element that holds the identity of that substance
Pure substance Something that has only one kind of particle
Element A pure substance that can not be broken down further through chemical methods
Molecule A group of two or more substances held togeather thorugh a chemical bond
Compound A pure substance made up of two or more elements
Qualitative physical properties A property that can be described not measured like odor
Quantitative physical properties A property of a substance that can be measured such as height
Density A mass to volume ratio of a substance
Malleability The ability of a substance to be hammered into thin sheets
Solubility The ability for a solute to mix with a solvent
Viscosity The ease at which particles in a substance slide past one another
Melting point The temperature at which a substance turns liquid
Boiling point The temperature at which a substance turns gas
State Whether a substance is solid, liquid, or gas
Lustre The amount of shine a substance has
Clarity How transparent a substance is
Ductility The ability to be stretched into a wire
Conductivity The ability of a substance to transmit heat,sound or electricity
Brittleness The ability of an object to break apart or shatter
Hardness The resistance of a substance to being scratched
Particle Theory of Matter A theory that explains how matter behaves
Energy Shells/ Orbitals The orbit in which electrons circle the nucleus
Noble gases The last group on the periodic table the have 8 valance electrons.
Alkali metals The first group on the periodic table they have one valance electron
Alkaline earth metals The second group of the periodic table they have 2 valance electrons
Metals Are good conductors and malleable to the left of the staircase
Non-metals Good insulators located to the right of the staircase
Metalloids Substances that have characteristics of metals and nonmetals in the staircase of the periodic table
Halogens The 7th group in the periodic table they have 7 valance elcetrons
Periods of the periodic table Horizontal rows in the periodic table have the same number of energy levels
Groups of the periodic table Vertical rows in the periodic table have the same number of valance electrons
Electron A negatively charged particle within a substance
Proton A positively charged substance that is a part of every atomic nucleus
Neutron An uncharged particle within the nucleus that is a part of almost every particle
Nucleus The center part of an atom where the protons and neutrons are
Valence electrons The number of electrons on the outer most orbital
Atomic number The number of protons in an element
Mass number the total number of neutrons added to the total number of protons
Ion A atom that's number of electrons has been has been changed so it's now positively or negatively charged
Anion A negativity charge ion
Cation A positively charged ion
Created by: amomi