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Chemical/Physical
Question | Answer |
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Physical property | A characteristic of matter that can be observed and measured without changing the identity or chemical makeup of the substance |
Examples of physical properties | Color, odor, size, hardness, luster, phase of matter, mass, density, boiling point, melting point, solubility, conductivity |
Color | Physical property; can be observed by looking at it |
Odor | Physical property; many substances have a noticeable odor |
Size | Physical property; can be measured without altering the chemical makeup of the substance |
Hardness | Physical property; the measure of how difficult or easy it is to scratch a substance |
Luster | Physical property; describes how light is reflected off of the surface of an object (How shiny is it?) |
Mass | Physical property; measures the amount of matter in an object |
Weight | Physical property; measures the force of gravity on an object |
Density | Physical property; how tightly packed the atoms in an object are; mass divided by volume |
Boiling Point | Physical property; the point at which a substance changes from a liquid to a gas |
Melting Point | Physical property; the point at which a substance changes from a solid to a liquid |
Solubility | Physical property; the measure in which an object dissolves into another object |
Electrical Conductivity | Physical property; 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; can only be observed when the substance is going through a chemical change or reaction |
Examples of Chemical Properties | reactivity, combustibility (flammability), and toxicity |
Reactivity | Chemical property; how easily an atom has a chemical reaction with another element |
Combustibility and flammability | Chemical property; the ability a substance has to burn |
Combustion | Chemical property; a chemical reaction that produces heat and light |
Toxicity | Chemical property; the ability and strength of a substance to cause poisonous effects to living things |
Physical Change | Change that happens without changing the chemical composition of a substance; no new substance is formed; 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; not reversible |