Physical & Chemical Changes.

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Physical and Chemical Changes

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Presentation transcript:

Physical & Chemical Changes

Matter changes around us all the time. Fast - Ice Melts Slow - Rusting

Click on the picture above. BrainPop: Property Changes Click on the picture above.

A change that affects only the physical properties of a substance. Physical Change A change that affects only the physical properties of a substance. Physical Properties are things like Size, Shape, & State of Matter

Physical Changes Start and end with same substance. Change in shape, size, phase (states). Can be observed without changing the composition of the substance.

Examples of Physical Changes Breaking a glass. Getting a haircut. Karate chopping a wood board. Adding chocolate syrup to ice cream. Squeezing a wet sponge.

Key Action Words Change shape and size: tear, break, compress, squeeze, grind, chop, grate, split, combine. Change state: melt, freeze, boil, cool, condense, warm, evaporate.

Click on the picture above. BrainPop: Matter Changing States Click on the picture above.

Changes the chemical composition of a substance. Chemical Change Changes the chemical composition of a substance. Evidence of Chemical Changes A new substance forms from a chemical reaction

Chemical Changes Unexpected color change Unexpected odor change Unexpected temperature change (breaking bonds) Unexpected gas formation (bubbles)

Examples of Chemical Changes Hydrogen peroxide bubbling on a wound. Using a Thermacare heat pack on your lower back. Activating a glow stick.

Chemical Changes Key Actions Words Reacts, burns, produces, forms, creates, yields.

Rearrangement of atoms in reactants to form products. Chemical Reaction Rearrangement of atoms in reactants to form products. Reactants Products Methane + Oxygen Carbon dioxide + water Methane bubbles

Energy in Reactions 1. Exothermic Reactions - energy is released, detected by a rise in temperature. 2. Endothermic Reactions - absorb energy, detected by a decrease in temperature.

Are these Physical or Chemical? Let's Practice! Are these Physical or Chemical? Cutting an apple. Burning a match. Mixing Kool-aid and water. Dissolving Alka-Seltzer in water and producing CO2 bubbles.