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Chemical & Physical

QuestionAnswer
Physical Property 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, and conductivity
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 a object
Weight is mass times gravity
Density how tightly packed the atoms in an object are.
Boiling Point Is the point at which a substance changes from a liquid to a gas
Melting Point Is 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 Is the measure of a material's ability to allow the transport of an electric charge.
Chemical Property Is a trait or behavior of a substance that gives it the ability or inability to undergo a chemical change. A chemical property can only be observed when the substance is going through a chemical change or reaction.
Combustibility and Flammability Both mean the ability a substance has to burn
Combustion Is a chemical reaction that produces heat and light.
Toxicity Is the ability or strength of a substance to cause poisonous effects to living things.
Reactivity How easily an atom has a chemical reaction with another element
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 The form, size, shape, or color of an object can change without affecting what makes up the substance
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.
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, Color, Odor, Conductivity, Ductile, Boiling Point, Melting Point, Luster, Size, Luminescence, Metal, Metalloid, Phase, Density, Hardness, Solubility, Magnetism, Ability to Dissolve, Specific Gravity,
Examples of Chemical Properties Oxidation, Flammability, Toxicity, Combustibility, Reactivity, Radioactivity
Created by: Rilynn