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Chemical & Physical

Chemical and Physical

QuestionAnswer
Physical Property A characteristic of matter that can be observed and measured without changing the identity or chemical makeup of the substance.(color, odor, size, hardness, luster, phase of matter, mass, density, boiling point, melting point, solubility, & combustibility
Color We can easily observe the color of a substance by looking at it
Odor Many substances have a noticeable odor
Size The size of a substance can be measured without altering the chemical makeup of the substance
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 in an object(stays the same)
Weight The affect of gravity on the mass
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 Is 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 electrical charge
Chemical Property A trait or behavior of a substance that gives it the ability or inability to undergo a chemical change.(Examples: Reactivity, Combustibility(flammability), and toxicity)
Combustibility and Flammability Both mean 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. No new substance is formed. The change is usually (but not always) reversible
Chemical Change Occurs when a substance undergoes a change that creates a new substance with different chemical and physical properties than the original substance. The change is not reversible
Reactivity How easily an atom has a chemical reaction with another element. This is based on Valence shells.
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 Odor, boiling point, melting point, hardness, size, luminescence, luster, solubility, conductivity, ability to dissolve, magnetism, color, ductile, malleable, specific gravity, phase, density, mass, and metal, metalloid, or nonmetal
Examples of Chemical Properties Oxidation, flammability, combustibility, toxicity, reactivity, and radioactivity
Examples of Physical Changes Example of dissolving, cutting, and changing phases
Examples of Chemical Changes Formation of a compound, example of toxicity, example of reacting, and example of oxidation