pure substances

Pure Substances A sample of matter that has definite chemical

and physical properties.

Wednesday, January 9, 13

Pure Substances A sample of matter that has definite chemical

and physical properties.

Elements pure substance that cannot be separated into

simpler substance by physical or chemical means.

Elements pure substance that cannot be separated into

simpler substance by physical or chemical means.

Compounds

Pure substance composed of two or more different elements joined by chemical bonds.

Made of elements in a specific ratio that is always the same Has a chemical formula Can only be separated by chemical means, not physically

Compounds

Pure substance composed of two or more different elements joined by chemical bonds.

Made of elements in a specific ratio that is always the same Has a chemical formula Can only be separated by chemical means, not physically

Mixtures

A combination of two or more pure substances that are not chemically combined.

substances held together by physical forces, not chemical

No chemical change takes place Each item retains its properties in the mixture They can be separated physically

Chem4kids.com

Mixtures

A combination of two or more pure substances that are not chemically combined.

substances held together by physical forces, not chemical

No chemical change takes place Each item retains its properties in the mixture They can be separated physically

Chem4kids.com

Mixtures vs. Compounds

http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml

Can you identify the following?You will be shown a series of photos. Tell if

each photo represents an item composed of an element, compound, or mixture.

Review: An element contains just one type of atom. A compound contains two or more different

atoms joined together. A mixture contains two or more different

substances that are only physically joined together, not chemically. A mixture can contain both elements and

compounds. Wednesday, January 9, 13

Element, Compound, or Mixture?Rocks

Element, Compound, or Mixture?

Copper

Jelly Beans

Table Sugar

Diamond

Tea

Salt

Neon Gas

Salad

Pure Water

Aluminum

Lemonade

Silver

Sand

Heterogeneous Mixtures

Type of matter consisting of at least two parts physically combined• Visible parts (phases)• Varying composition• Impure • Physically separable

keynote:/Users/TaraTurner/Library/Mobile%20Documents/com~apple~Keynote/Documents/Classification%2Bself%2B.key-tef?id=BGSlide-16

Heterogeneous Mixture Examples

Dirt Heterogeneous mixtures have more than one visible phase

Concrete Car

http://images.google.com/imgres?imgurl=http://www.racecarpartsdepot.com/images/T-Bird-chute2.jpg&imgrefurl=http://www.racecarpartsdepot.com/&h=387&w=500&sz=190&tbnid=35d3NTc7PicJ:&tbnh=98&tbnw=127&hl=en&start=18&prev=/images%3Fq%3Dcar%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8

http://propro.ru/go/Wshop/textures/images/concrete.jpg

Homogeneous Mixtures

Matter that is uniform throughoutReferred to as a Solution• 1 visible part (uniform

distribution)• Constant composition

throughout• Even distribution of

particles

http://images.google.com/imgres?imgurl=http://antoine.frostburg.edu/chem/senese/101/matter/images/homogeneous.gif&imgrefurl=http://antoine.frostburg.edu/chem/senese/101/matter/index.shtml&h=62&w=98&sz=3&tbnid=m58d8RO2nLkJ:&tbnh=48&tbnw=77&hl=en&start=48&prev=/images%3Fq%3Dhomogeneous%2Bmixture%26start%3D40%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8%26sa%3DN

http://images.google.com/imgres?imgurl=http://img.tfd.com/dict/113/753857-solution.jpg&imgrefurl=http://www.thefreedictionary.com/solution&h=128&w=125&sz=10&tbnid=re8O7F2_G-sJ:&tbnh=85&tbnw=83&hl=en&start=49&prev=/images%3Fq%3Dhomogeneous%2Bmixture%26start%3D40%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8%26sa%3DN

http://images.google.com/imgres?imgurl=http://www.yorktown.k12.in.us/yhs/teachers/clucas/3forchemistryteachers_files/Solution-Precipitate.jpg&imgrefurl=http://www.yorktown.k12.in.us/yhs/teachers/clucas/3forchemistryteachers.htm&h=354&w=353&sz=33&tbnid=FZE-KSi3P6IJ:&tbnh=117&tbnw=116&hl=en&start=8&prev=/images%3Fq%3Dsolution%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8

Solution (Homogeneous Mixture) Examples

Salt water Brass (A solution of metals=alloy)

Glass Solutions appear to be one part, but are actually just mixed very well

http://images.google.com/imgres?imgurl=http://www.wehug.com/Brass-sitting-kuan-yin-on-hand-47501b.jpg&imgrefurl=http://www.wehug.com/kuan-yin-quan-yin.html&h=474&w=421&sz=34&tbnid=ySYuanabbrwJ:&tbnh=126&tbnw=111&hl=en&start=6&prev=/images%3Fq%3Dbrass%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8

http://images.google.com/imgres?imgurl=http://science.nasa.gov/headlines/y2003/images/zeroglass/10501531.jpg&imgrefurl=http://science.nasa.gov/headlines/y2003/14apr_zeroglass.htm&h=432&w=640&sz=29&tbnid=oKKxQ9M2c8YJ:&tbnh=91&tbnw=135&hl=en&start=3&prev=/images%3Fq%3Dglass%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8

http://images.google.com/imgres?imgurl=http://thinks.com/jigsaw/buildings/glass.jpg&imgrefurl=http://thinks.com/cgi-bin/jigsaw.pl%3Fpuzz%3D/buildings/glass&h=313&w=400&sz=16&tbnid=ocJzpzfyOY8J:&tbnh=93&tbnw=120&hl=en&start=47&prev=/images%3Fq%3Dglass%26start%3D40%26svnum%3D10%26hl%3Den%26lr%3D%26ie%3DUTF-8%26sa%3DN

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