Classification of Matter: Mixtures, Elements, and Compounds, Summaries of Earth science

Download Classification of Matter: Mixtures, Elements, and Compounds and more Summaries Earth science in PDF only on Docsity!

A Matter of FactA Matter of Fact

Mixtures, Elements and Mixtures, Elements and

Compounds Compounds

Mixtures, elements,Mixtures, elements,

compounds compounds



Scientists like to classify things.Scientists like to classify things.



One way that scientists classifyOne way that scientists classify

matter is by its composition. matter is by its composition.



Ultimately, all matter can beUltimately, all matter can be

classified as mixtures, elements and classified as mixtures, elements and

compounds. compounds.

Why isn’t matter classifiedWhy isn’t matter classified according to its physical according to its physical characteristics, such as color? characteristics, such as color?  Scientists wouldn’t find it very useful toScientists wouldn’t find it very useful to group gold, sunflowers, and the sun group gold, sunflowers, and the sun together. together.



Scientists ask themselves theseScientists ask themselves these

questions? questions?

 Is the matter uniform throughout?Is the matter uniform throughout?  Can it be separated by physical means?Can it be separated by physical means?  Can it be separated by chemical means?Can it be separated by chemical means?

Is it uniform throughout?Is it uniform throughout?



If the answer is no, the matter is aIf the answer is no, the matter is a

heterogeneous mixture. heterogeneous mixture.

 Considered the “least mixed.”Considered the “least mixed.”  Does not appear to be the sameDoes not appear to be the same throughout. throughout.  Particles are large enough to be seenParticles are large enough to be seen and to be separated from the mixture. and to be separated from the mixture.

Granite is a heterogeneous mixture.

Can it be separated byCan it be separated by

physical means? physical means?



If the answer is yes, the matter is aIf the answer is yes, the matter is a

homogeneous mixture or solution. homogeneous mixture or solution.

Homogeneous MixturesHomogeneous Mixtures



A mixture that appears to be theA mixture that appears to be the

same throughout. same throughout.



It is “well mixed.”It is “well mixed.”



The particles that make up theThe particles that make up the

mixture are very small and not easily mixture are very small and not easily

recognizable. recognizable.

ColloidsColloids

 In a colloid theIn a colloid the particles are mixed particles are mixed together but not together but not dissolved. dissolved.  The particles areThe particles are relatively large and relatively large and are kept are kept permanently permanently suspended. suspended. (^2040600) 80100 1st Qtr 2nd Q tr 3r d Qtr 4th Qtr East West Nor th

ColloidsColloids

 A colloid will notA colloid will not separate upon separate upon standing. standing.  The particles areThe particles are constantly colliding, constantly colliding, and this allows a and this allows a colloid to scatter colloid to scatter light – thus colloids light – thus colloids often seem cloudy. often seem cloudy.

SolutionsSolutions

 A solution is a type of homogeneousA solution is a type of homogeneous mixture formed when one substance mixture formed when one substance dissolves in another. dissolves in another.  It is the best mixed of all mixtures.It is the best mixed of all mixtures.  A solution always has a substance that isA solution always has a substance that is dissolved and a substance that does the dissolved and a substance that does the dissolving. dissolving.  The substance that is dissolved is theThe substance that is dissolved is the solute and the substance that does the solute and the substance that does the dissolving is the solvent. dissolving is the solvent.