10 Examples of Physical Changes BoilingFreezingDissolvingBreakingMaking a mixture - 2 or more types of matter (substances) mixed togetherCan be separated physicallyAll phase changes are physical changes!
11 Henry takes a cup of water and places it in the freezer Henry takes a cup of water and places it in the freezer. The liquid water changes to ice. Henry thinks this change is not a physical change, because the water changed into ice. Do you agree or disagree? Why?
12 What is a property?Property: a characteristic of a substance that can be observed12
13 Two kinds of properties: Physical PropertiesandChemical Properties
14 Physical PropertyA characteristic of a substance that can be observed without changing the substance into another substance
15 Chemical PropertyDescribes matter based on its ability to change into new matter that has different properties
16 The ability of a substance to burn FlammabilityThe ability of a substance to burnWood has the chemical property of flammability. When wood is burned, ash and smoke are created.
17 ReactivityThe ability of two or more substances to combine and form one or more new substances
18 Iron has the chemical property of reactivity with oxygen Iron has the chemical property of reactivity with oxygen. When iron reacts with oxygen, it rusts.
38 PhysicalThe composition stays the same.Substance is not changed, just size or shapeChange can be undone.Color changes (careful!)Changing StateDissolvingBending, Crushing, Mixing, Cutting, etc.ChemicalThe composition changes.Change CANNOT be undone.Color changes (careful!)Production of gas (bubbles)Production/Change in odorChange in temperatureProduction of precipitate
54 Evaporating the water separates the ingredients. Physical ChangeAfter mixing the lemonade powder and water, lemonade powder and water are still present.Evaporating the water separates the ingredients.
68 Physical ChangeSeparating the rocks from the sand can be done by physical means.The identities of the rocks and sand do not change.
69 Exit Slip Define and give an example of a physical property. Define and give an example of a physical change.Define and give an example of a chemical property.Define and give an example of a chemical change.