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Transcript of Pure Substance
A substance that cannot be separated by physical means.
A substance that cannot be broken down by chemicals.
A chemical substance consisting of two or more different chemical elements.
Examples - Water, gold, and diamonds.
There are millions of different pure substances.
Some people call pure substances the building blocks of matter.
Examples - Copper, iron, and gold.
There are 117 elements.
All elements are shown on a chart called the Periodic Table of Elements.
Examples - Water and Salt
Compounds can be decomposed into elements or simpler compounds.
The components of a compound are chemically combined.
Two or more substances that are combined without chemicals.
Examples - Trail mix and chex mix.
Mixtures can be separated again.
The two kinds of mixtures are homogeneous and heterogeneous.
- Trail Mix
A mixture that cannot be seperated.
Examples - Kool- aid and milk
- Robby Gilbertson 1B
All homogeneous mixtures are evenly blended.
You can't pick out the things in homogeneous mixtures.
A mixture that can be separated.
Examples - Trail mix and chex mix
The substances stay the same when they are mixed together.
You can pick out the things in a heterogeneous mixture.
- Trail Mix
A property used to characterize physical objects.
Examples - Color and density
Not all physical properties are applicable to all objects.
Some physical properties are complex, while others are obvious.
Examples - Melting and sublimation
A change in the state of matter.
Phase change is also known as a phase transition.
There are 6 different phase changes.
Density is how much matter is in a substance.
Examples - The density of water is 1. The density of ice is below 1.
Examples - Crushing a can or glass breaking.
A physical change is a change in size, shape, or state of matter.
A new substance is not created during a physical change.
Physical changes occur when substances are mixed, but don't chemically react.
- Glass breaking
A chemical property is a characteristic of a substance that determines what type of chemical change can undergo.
Examples - Combustibility and flammability.
Chemical properties cannot be determined by touching or viewing a sample.
Chemical properties may be used to classify compounds.
The tendency of a substance to undergo chemical reaction.
Examples - Fireworks and baking soda with vinegar.
The least reactive element is helium.
The least reactive metal is platinum.
The process by which a certain substance becomes a different substance.
Examples - Cooking a egg or rust on a iron pan.
Produces a new substance.
Chemical changes cannot be reversed.
- Rust on a pan
If the density is below 1, then it floats in water.
You can calculate density by mass divided by volume.
- Ice floating in water.