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physical & chemical

Chemical and Physical changes and properties

TermDefinition
physical property a characteristic of matter that can be observed and measured without changing the identity or chemical makeup of the substance.
color We can easily observe the color of a substance by looking at it.
odor Many substances have a noticeable odor.
size Many substances have a noticeable odor.
hardness Hardness is the measure of how difficult or easy it is to scratch a substance.
luster Luster describes how light is reflected off the surface of an object. (How shiny is the object?)
mass The amount of matter that is in an object
weight weight is mass x gravity
density how tightly packed the atoms in an object are.
boiling point the point at which a substance changes from a liquid to a gas.
melting point the point at which a substance changes from a solid to a liquid.
solubility the measure in which an object dissolves into another object.
electrical conductivity the measure of a material’s ability to allow the transport of an electric charge.
chemical property a trait or behavior of a substance that gives it the ability or inability to undergo a chemical change
combustibility and flammability the ability a substance has to burn.
combustion a chemical reaction that produces heat and light.
toxicity the ability or strength of a substance to cause poisonous effects to living things.
physical change a change that happens without changing the chemical composition of a substance.
chemical change A chemical change occurs when a substance undergoes a change that creates a new substance with different chemical and physical properties than the original substance.
reactivity how easy an atom has a chemical reaction with another element
What causes the odor when milk sours? When milk begins to ferment (break down), it smells bad because of the bacteria that is being formed. Chemicals with a sour odor are released by this bacteria.
What causes the bubbles in a chemical reaction? Some chemical reactions occur and cause a gas to form. The bubbles are the evidence of the gas fumes escaping.
What is a precipitate? It is an insoluble (can’t dissolve) solid that is formed when two liquids combine.
examples of physical properties malleable, metal, nonmetal, metaloid, mass, density, phase, color, specific gravity, ductile, magnetism, conductivity, ability to dissolve, solubility, luster, hardness, size, boiling point, odor, luminescence, melting point,
examples of chemical properties oxidation, flammability, toxicity, combustibility, reactivity, radioactivity.
examples of physical changes examples of dissolving, cutting, changing phases.
examples of chemical changes formation of a compound, examples of reacting, examples of oxidation, examples of toxicity.
Created by: Bryson Harris