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Matter: Physical and Chemical Changes Part 2

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Physical Change Physical changes occur when matter changes its property but not its chemical nature. Physical changes could include a change in: texture, shape, size, color, odor, volume, mass, weight, and density.

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Physical Change Remember! properties remain the same reversible can be used to separate mixtures

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Physical Change

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Chemical Change Chemical changes are changes matter undergoes when it becomes new or different matter. To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, and presence of heat.

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C. Chemical Change Remember! properties change irreversible Signs: color change, formation of a gas/solid, release of light/heat

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Chemical Change A chemical change occurs when fireworks are used. Fireworks are made of metals such as magnesium and copper. These change chemically as they light up the sky.

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Density Density describes how much mass is in a given volume of a material.

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Density Solids, liquids and gases are matter, so they all have density.

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Determining Density To find the density of a material, you need to know the mass and volume of a solid sample of the material. 1. Mass is measured with a balance or scale. 2. Use the displacement method or calculate the volume.

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Density Problems

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What is my Density? Mass 1. 500g 2.300g 3.25g Volume 50ml 15ml 5cm3 Complete the following questions on a separate sheet of paper as a part of your homework assignment.

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Quiz Yourself Go through the following slides to quiz your knowledge of physical and chemical changes. Remember there is a quiz tomorrow!

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Is it a chemical or physical change? Sugar dissolving in tea Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!

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Is it a chemical or physical change? Logs burning Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!

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Is it a chemical or physical change? Breaking water up by separating it into hydrogen and oxygen Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!

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Is it a chemical or physical change? Cutting paper Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!

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Is it a chemical or physical change? Crushing an aspirin Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!

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Is it a chemical or physical change? Metal rusting Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!

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Is it a chemical or physical change? Lighter fluid burining Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!

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Is it a chemical or physical change? An egg rotting Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!

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Is it a chemical or physical change? An egg breaking Chemical Change Physical Change

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OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

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Correct!