Physical and Chemical Changes Physical Properties Any property

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Physical and Chemical Changes

Physical and Chemical Changes

Physical Properties Any property of a substance that can be observed or measured without

Physical Properties Any property of a substance that can be observed or measured without changing the chemical identity of the substance is a physical property.

Physical Change Occurs when 1 or more physical properties are affected Ex. Shape and

Physical Change Occurs when 1 or more physical properties are affected Ex. Shape and size of a substance can be altered during a physical change. Ex. wool from sheep. . . wool cleaned and separated. . . is still wool from sheep Chemical identity of wool has stayed the same.

Chemical Changes of Matter Ex. Wooden log. . . fire burns it. . .

Chemical Changes of Matter Ex. Wooden log. . . fire burns it. . . black powdery ash. . . No longer wooden log A chemical change occurs when a substance changes into an entirely new substance with different properties. !!!! CHEMICAL PROPERTIES ARE NOT CHEMICAL CHANGES!!! Chemical properties of a substance describes which chemical changes can or cannot happen to that substance.

Chemical Change Cont’d. Chemical changes change the chemical makeup like the arrangement of particles

Chemical Change Cont’d. Chemical changes change the chemical makeup like the arrangement of particles and chemical bonds. It is influenced by temperature. The hotter it is, the quicker the chemical reaction occurs.

Signs of a Chemical Change Gas, odor, precipitate-solid formed in liquid, changes in color,

Signs of a Chemical Change Gas, odor, precipitate-solid formed in liquid, changes in color, and changes in energy If you see two or more of these signs, you are most likely observing a chemical reaction.

Law of Conservation of Mass In ordinary chemical and physical changes, mass is not

Law of Conservation of Mass In ordinary chemical and physical changes, mass is not created nor destroyed. It is only transformed into a new substance. Ex. https: //www. youtube. com/watch? v=RHOC 44 LU 8 Nw

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