Properties and Changes
Matter can be described and identified by physical and chemical properties. Physical _________chemicalspropertiessubstancestextures have to do with appearance. You can observe many physical properties with your senses and by measuring the length, _________widthdensityheightproperty, height, mass and density of a substance. _________ChemicalMatterDescribedPhysical properties include color, shape, smell, texture, taste and size. The state of matter (whether it's a solid, _________watermoleculeliquidatom, or gas) and the _________timetemperaturedesigncylinder at which the substance boils, melts or freezes are also physical properties. Magnetic properties are physical properties as well.
_________ChemicalPhysicalSubstanceGaseous properties, on the other hand, have more to do with the atomic or molecular composition of matter. Chemical properties deal with how substances react with other _________propertiesphysicalsdegreessubstances such as water, air or fire.
A physical change has occurred when a substance changes color, size, shape, temperature or state. A _________temperaturephysicalchemicalcolor change has occurred when a substance has changed into something new or _________similardifferentfamiliarorigional so that the original substance is gone. Digestion and combustion are examples of chemical changes. A chemical change takes place in a _________batterybulbchangeswitch to produce electricity when you turn on a flashlight.
Chemical changes are sometimes represented by a chemical formula:
2H2 + O2 = 2H2O
This formula states that two hydrogen gas molecules react with one oxygen gas molecule to produce two molecules of water.
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