Chemical Reactions

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Chemical reaction

the process by which the atoms of one or more substances are rearranged to form different substances.

What can tell us a chemical reaction has occurred? (Think about chemical changes)​

Review


  • What is an ionic compound?​​​

  • What is a covalent compound?

Ionic or covalent? Draw it.

​Remember: Ionic = Metal + nonmetal, covalent = non-metal + nonmetal

  • CaCl2​

  • CO2​

  • Mg3S2​

  • CF4​

  • NaCl​

  • KCl​

  • H2O

Naming Compounds - If they are ionic..


  • Cation (metal) keeps the element’s name.​

  • Anion (non-metal) ends in -ide.​

  • Example:​

  • NaCl is Sodium chloride

  • CaO is Calcium oxide


What do you think KF would be called?​

Naming compounds - If they are covalent


  • Use prefixes​

  • Element found to the right on the periodic table is named second and ends in –ide.​

  • Example:​

  • N2O4 is Dinitrogen tetroxide​

  • H2O is Dihydrogen monoxide​

  • What would be the name of CF4 ?

Chemical equations!


  • What is the chemical symbol of oxygen?​

  • What is the chemical formula for water?​

  • So what do you think would make up a chemical equation?

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Chemical Symbols

Form

Chemical Formulas

which form

Chemical Equations

What makes up a chemical equation?

Reactants

Products

Coefficients

Subscript

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How to Balance Equations

The Law of Conservation of Matter

States that matter is neither created nor destroyed during a chemical reaction even though it may change from one form to another.​

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  • Because matter is neither created nor destroyed there must be an equal number of atoms of each element in the products as in the reactants.​

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Types of chemical reactions​

  1. Synthesis reaction​

  2. Decomposition reaction​

  3. Single replacement reaction​

  4. Double replacement reaction​

  5. Combustion​

Synthesis reaction

When two or more substances combine to form a single substance


A + B ------> AB

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Decomposition reaction


  • When a single compound breaks down into simpler compounds.​

  • AB ---> A + B​

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Single replacement reaction​

When an element replaces another element in a compound
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Double replacement reaction​


  • When the cations of two compounds switch places.​

  • AB + CD ------> CB + AD

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Combustion reaction​

  • When substances in a reaction combine with oxygen to produces carbon dioxide and water.​

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