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chemical & physical

QuestionAnswer
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 Property 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 Amount of matter in an object STAYS the same!!
Weight mass+gravity=weight
Density Density is how tightly packed the atoms in an object are.
Boiling Point The boiling point is the point at which a substance changes from a liquid to a gas.
Melting Point The melting point is the point at which a substance changes from a solid to a liquid.
Solubility Solubility is the measure in which an object dissolves into another object.
Electrical Conductivity Electrical conductivity is the measure material's ability to allow the transport of an electric charge
Chemical Property A chemical property is a trait or behavior of a substance that gives it the ability or inability to undergo a chemical change.
Combustibility and Flammability Combustibility and flammability both mean the ability a substance has to burn.
Combustion Combustion is a chemical reaction that produces heat and light.
Toxicity Toxicity is the ability or ignition point of a substance to cause poisonous effects to living things.
Physical Change A physical change is 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 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. The change is not reversible.
reactivity How easily 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.
Created by: idelma
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