Physical and Chemical Changes

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Presentation transcript:

Physical and Chemical Changes

Matter has properties Two basic types of properties that we can associate with matter. Physical properties Chemical properties

Matter Matter is everywhere. Matter is anything that takes up space and has mass. Matter is constantly experiencing both chemical and physical changes.

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

Examples of Physical Changes Boiling Freezing Dissolving Breaking Making a mixture 2 or more types of matter (substances) mixed together Not in specific amounts Can be separated physically

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.

Evidence of a Chemical Change Evidence of a chemical reaction Formation of gas Formation of precipitate Change in color Change in energy Endothermic Absorbs heat energy (gets cold) Exothermic Releases heat energy (gets hot)

Chemical Changes The composition of the substance changes. The substances present at the beginning of the change are not present at the end; new substances are formed. The change cannot be “undone.”

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

Physical Change Correct!

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

Chemical Change Correct!

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

Chemical Change Correct!

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

Physical Change Correct!

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

Physical Change Correct!

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

Chemical Change Correct!

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

Chemical Change Correct!

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

Chemical Change Correct!

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

Physical Change Correct!

Writing Activity Write a paragraph about the difference between a chemical and physical change. Give examples of each.