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Phys Science Sem 1

9th grade semester review

TermDefinition
Volume Amount of space an object occupies
Area L x W
Scientific notation ex: 6.43 x 10 ( exponent)
Graph a visual display of information
Elements Substances made of only one kind of atom
Molecules Atoms held together by covalent bonds
Compounds 2 or more elements chemically combined
Mixture 2 or more elements not chemically combined
Atoms Most basic form of matter
Atomic number Number of protons in an atom
Isotope Same element but different number of neutrons in atom
Phase change Changing between solid-liquid-gas
Evaporation liquid to gas
Condensation gas to liquid as air cools onto object (like a cold glass on a hot day)
Freezing Point point at which a liquid changes to a solid
Boiling point point at which a liquid becomes a gas
chemical formula the elements in a compound are described this way
Subscript Little number after the abbreviation of the element name
Atomic bonds Electrons are shared or transferred
Covalent bonds Electrons are shared
Ionic bonds Electrons are transferred
Characteristics The properties of an element or compound that don't change based on amount. Boiling point, etc.
Density mass/volume
Law of Conservation of mass Mass can't be changed or destroyed
Synthesis simpler reactants form a more complex product
decomposition complex reactants broken down into simpler product
combustion reaction always includes oxygen and a molecule of carbon/hydrogen
exothermic reaction Light or heat energy is given off
Endothermic Reaction reaction in which energy is absorbed
Solute the solid that is dissolved in water
solvent the liquid that dissolves the solid
Solution the solute and solvent together
Saturated solution A solution with the maximum amount of solute at the temp
Solubility Amount of solids that can be dissolved in a solution. This increases with rise in temp.
Concentration The amount of solute in the solution
Precipitate A solid that settles at the bottom of a solution when cooled.
Acid pH of less than 7, donates protons
Bases accepts protons, pH of more than 7
Fractional distillation uses boiling point to separate mixtures
Filtration procedure used to separate insoluble solids
Paper Chromatography procedure used to separate mixtures based on different solubilities
Created by: cesdawson