Chemical substance
A chemical substance is any material with a known chemical composition.[1] For example, water has the same properties and the same ratio of hydrogen to oxygen whether it came from a river or was made in a laboratory. Typical chemical substances found in the home include water, salt and bleach. Generally, substances exist as a solid, a liquid, or a gas, and may change between these phases of matter when there are changes in temperature or pressure.
Gallery
- Silizium pulver.jpg
Gray silicon powder, an element. All the other ones are chemical compounds.
- Salt Crystals.JPG
White sodium chloride
- Manganese(II) chloride tetrahydrate.jpg
Pink hydrated (with water) manganese (II) chloride
- Manganese(II)-carbonate-sample.jpg
Brown manganese (II) carbonate
- CopperIIoxide.jpg
Black copper (II) oxide
- Cobalt(II)-chloride-hexahydrate-sample.jpg
Red hydrated (with water) cobalt (II) chloride
- Kaliumdichromat.JPG
Orange potassium dichromate
- Chroman sodný.JPG
Yellow sodium chromate
- Copper(II) chloride dihydrate.jpg
Green hydrated (with water) copper (II) chloride
- Copper sulfate.jpg
Blue hydrated (with water) copper(II) sulfate
- Chromium(III)-chloride-purple-anhydrous.jpg
Purple anhydrous (without water) chromium (III) chloride
Chemical Substance Media
Steam and liquid water are two different forms of the same pure chemical substance, water.
- SN1 general reaction.svg
Picture of a formed molecule
- Nile red 01.jpg
Colors of a single chemical (Nile red) in different solvents, under visible and UV light, showing how the chemical interacts dynamically with its solvent environment
- Schwefel 01.jpg
Native sulfur crystals. Sulfur occurs naturally as elemental sulfur, in sulfide and sulfate minerals and in hydrogen sulfide.
- Potassium-ferricyanide-sample.jpg
Potassium ferricyanide is a compound of potassium, iron, carbon and nitrogen; although it contains cyanide anions, it does not release them and is nontoxic.
- Chemical compounds.jpg
Chemicals in graduated cylinders and beaker
- Ethanol-2D-skeletal.svg
Ethanol chemical structure
References
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- ↑ Hill, J. W.; Petrucci, R. H.; McCreary, T. W.; Perry, S. S. General Chemistry, 4th ed., p5, Pearson Prentice Hall, Upper Saddle River, New Jersey, 2005.
