writing and balancing chemical equations · 2015-03-09 · writing and balancing chemical equations...

Writing and Balancing Chemical Equations

9.2

Writing and Balancing Chemical Equations9.2Chemical equations are used to describe chemical reactions.

WORD EQUATION uses chemical names (words) to describe a reaction

E.g. Hydrogen + oxygen à water

FORMULA EQUATION – uses chemical formulas to describe a reaction

(called a skeleton equation if no coefficients added)

Writing and Balancing Chemical Equations9.2

To show that mass/atoms are conserved we must count all atoms

Coefficients give the number of molecules of each compound or element

Subscripts – give the number of atoms of each element.Total atoms shown:

coefficient

subscript

___ hydrogen, ___ oxygen

Writing and Balancing Chemical Equations9.2

When the number of atoms of each reactant element(s) are the same as the number of atoms of each product element(s), the equation is balanced.

H atoms __ O atoms à __ H atoms __ O atoms

2 H2O → 2 H2 + O2

Balance the following Chemical Reactions

__Sn + __O2 __SnO


__MgCl2 __Mg + __Cl2


__KNO3 __KNO2 + __O2

__Ca3(PO4)2 + __ H2SO4 → __ CaSO4 + __ Ca(H2PO4)2

1. Balance the following Chemical Reactions

__CH4 + __O2 __CO2 + __H2O

Attachments

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Jan 18 - 9:02 AM SMART Board or AirLiner Lesson Lesson Title: Balancing Equations Subject(s) Area: Chemistry / Physical Science State Standards and Indicators: 1. ▲ understands a chemical reaction occurs when one or more substances (reactants) react to form a different chemical substance(s) (products). There are different types of chemical reactions all of which demonstrate the Law of Conservation of Matter and Energy. 1a. Chemical reactions are written as balanced chemical equations. In ordinary chemical reactions, the number and kind of atoms must be conserved. b. Examples of chemical reactions are synthesis, decomposition, combustion, single and double replacement, acid/base, and oxidation/reduction. Activity Instructions: Review types of equations and balancing equations by using the hyperlinks on the first page of the notebook lesson. On subsequent pages identify the type of equation, balance the molecules by cloning the objects and then write a final balanced equation, also practice naming compounds by saying them out loud in class and then use the sound link on each molecule. On the last slide is a brain buster hyperlink to try and balance more equations. Grade Levels: 9-12 Created by : Beth McKee School Name: East HIgh School

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Feb 12-10:08 Notes Notes 4. Clone each of the following chemicals to create balanced equation. Then write the type of equation and balance the equation using formulas. Balancing Equations 2. Lets look at a tutorial before we practice our equations. 1. 3.

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Jun 27-12:31 PM Cl Cu Cl + Type of Equation: Balanced Equation: Cu Al Cl Cl Cl Al +

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Mar 9 - 2:13 PM H O H + O O H H Balanced Equation: Type of Equation:

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Jun 27-12:37 PM Balanced Equation: Type of Equation: + Pb I I + Pb O O N O O O N O I K K O O N O

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Mar 9 - 11:23 AM + N N H H N H H H Balanced Equation: Type of Equation:

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Mar 9 - 11:26 AM N H H H F F F + F F N N Balanced Equation: Type of Equation:

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Mar 9 - 1:25 PM + H Cl Cl Cl H H Balanced Equation: Type of Equation:

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Jun 27-12:37 PM Balanced Equation: Type of Equation: + + C O O H O H H H H H C C H O H O O

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Mar 9 - 11:14 AM H O H O O H H + O O Balanced Equation: Type of Equation:

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Jun 27-12:37 PM H O Ca H O + Balanced Equation: Type of Equation: + Ca Cl Cl H Cl H O H

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Jun 27-11:23 AM

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Jun 28-9:56 AM

SMART Notebook

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writing and balancing chemical equations · 2015-03-09 · writing and balancing chemical equations...

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