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Physical & Chemical

What is a Physical Property a characteristic of matter that can be observed and measured without changing the identity or chemical makeup of the substance.
Color the color of a substance, found by observing it
Odor the smell a substance produces
Size can be measured without altering the chemical makeup of the substance
Hardness the measure of how difficult or easy it is to scratch a substance
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; never changes
Density how tightly packed the atoms in an object are.
What is a Boiling Point the point at which a substance changes from a liquid to a gas
What is a 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
What is a 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
What is a 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.
What is 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.
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: Matthew Bryant