The processes in nature are accompanied by changes in the properties of the participating substances. Processes that change only the physical properties of the participating substance or substances are called physical. There is no transformation of a substance into another during the physical processes. The change of water temperature may change its physical condition, but it will still remain water. There are processes in nature when some substances are transformed into others, thus changing their chemical properties.

• Definition
• Expressing of chemical processes by equations
• Mechanism of chemical processes

• Theory
• Virtual experiments
• Problems and tests

• Burning of methane - click here to see the movie
• Acylation of toluene - click here to see the movie

Theory

http://www.chemistry.ohio-state.edu/betha/nealChemBal/index.html
Explanations for the meaning of chemical equations and different examples of balancing of chemical equations.

http://chemmac1.usc.edu/java/balance/balance.html
Examples for stoichiometry of chemical reactions.

http://www.chemtutor.com/react.htm#bal
The site contains detailed explanations for the chemical and physical changes, many examples for different reactions and balancing of chemical equations.For instance, balancing of ionic equations with polyatomic ions, combustion equations and synthesis reactions.

http://www.chemistry.co.nz/chemequa.htm
The site contains definitions of oxidation and reduction, oxidation number and valency, tables of common ions and examples.

http://www.lcusd.net/lchs/mewoldsen/MoleExamples.htm
Examples for estimation of molar mass, number of moles of atoms and molecules. Examples for balancing of chemical equations.

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Virtual experiments

http://www.chem.uiuc.edu/clcwebsite/demos.html
Th? site contains demonstrations of combustion of methanol, electrolysis of water, igniting a hydrogen filled balloon and other processes.

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Problems and tests

http://www.chem.vt.edu/RVGS/ACT/notes/Types_of_Equations.html Rules for writing equations with many examples.

http://lrc-srvr.mps.ohio-state.edu/under/chemed/qbank/quiz/bank3.htm Quizzes and tutorials.

http://www.chemtutor.com/syn BALANCING EQUATIONS for all types of reactions. Examples.

http://web.jjay.cuny.edu/~acarpi/NSC/6-react.htm Chemical equation; exercises.

http://scidiv.bcc.ctc.edu/wv/6/0006-000-self_test.html Self tests on balancing equations.

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