Balancing Chemical Reactions

Slides:

Advertisements

Similar presentations

Atomic Theory Atoms are building blocks of elements

Advertisements

Chemical Reactions Chapter 11

The Rearranging of Atoms

Conservation of Mass and Reactions. Objective 4 TEK 8 The student knows tat changes in matter affect everyday life. (C ) The student is expected to investigate.

Unit 8 – Chemical Equations and Reactions Notes p.1-2 These ones are in order!

Chemical Formulas & Equations. Molecule A combination of two or more atoms bonded together.

Balancing Act. Atoms are not created or destroyed during a chemical reaction. Na F Mg Li O.

Chemistry Notes: Chemical Reactions Chemistry

Writing And Balancing Equations Chemistry Dr. May.

Chemical Equations Putting chemical changes into words.

Balancing equations: 1 st …review what we already know.

Balancing Chemical Equations. Parts of a Chemical Equation.

Balancing Chemical Equations Chapter 7. What is Balancing? Making sure there are equal numbers of each type of atom on each side of a chemical reaction.

Chapter 7.2 – Chemical Equations -chemical reactions can be described two main ways 1.word equation – write the names of the products and reactants ex.

Reactants General reaction equation: Products Bricks + lumber + cementBuilding.

Law of Conservation of Mass In a chemical reaction, matter is neither created nor destroyed. Atoms won’t change their identity (e.g. a Carbon atom can’t.

Law of Conservation of Mass Law of Conservation of Mass: Mass is neither created nor destroyed during a chemical reaction- it is conserved Mass reactants.

Chemical Reactions. Chemical Equations A chemical equation is a representation of a chemical reaction; the formulas of the reactants (on the left) are.

Chemical reactions  Remember indications of a chemical change  energy change  Color change  Precipitate formed  Gas given off.

Chemical Equations. The “sentences” of chemistry Show how elements react with each other and what compounds they will form So that’s what happens when.

Balancing Chemical Equations. What does a chemical equation look like? Reactants Products Examples 2Na + Cl 2 2NaCl H 2 + O 2 H 2 O 2 2H 2 + O 2 2H 2.

Section  Balance skeleton equations  Balance word equations.

Chemical Reactions. Chemical Reaction _______________ – process by which the atoms of one or more substance are rearranged to form different substances.

Balancing Equations Balancing, Writing, and Naming Equations.

Balancing Equations Balancing, Writing, and Naming Equations.

CH 8 CHEMICAL REACTIONS AND EQUATIONS SECTIONS 1 AND 2.

Notes – Chemical Equations Chapter 8, Lesson 2. Conservation of Mass When the end of the last period bell rang, everyone moved to a new room, and ended.

Agenda 11/18 Chemical Reactions Objective: To predict the products of chemical reactions Warm-up: Atoms in a compound Balancing Equations Steps Example.

Ch – Chemical Reactions II. Balancing Equations read: (p. 278 – 283)

Chemical Equations Chapter 11 Notes. Balanced Equation 2 NaCl + F 2  2 NaF + Cl 2 ReactantsProducts Yields is the “equals” Coefficient used to balance.

Writing Chemical Equations

Chemical Reactions and Equations. Chemical Reaction A process in which one or more substances are converted into new substances with different physical.

Chemical Reactions Law of Conservation of Mass Balancing Chemical Equations.

Courtesy: Chemical change – reorganization of the atoms in one or more substances. Represented by a chemical equation with the reactants.

Balancing Equations. Law of Conservation of Mass: In a chemical reaction, matter can be neither created nor destroyed. In a chemical reaction, matter.

BALANCING EQUATIONS… A balancing act.. What are they for?!?! Chemical Equation: a way to represent chemical reactions on paper.

Reactants General reaction equation: Products Bricks + lumber + cementBuilding.

Agenda: 3/27 Objective: to predict products in a chemical reaction Warm-up: Formative Assessment Chemical Reactions.

Chemical Reactions: An Introduction Chapter 6. Pre-Chapter Questions 1.How can you tell that a chemical reaction has taken place? 2.What is the law of.

The Question (Learning Goals)

Balancing Equations. Law of Conservation of Mass States matter can neither be created nor destroyed. Thus, atoms are neither created nor destroyed, only.

BALANCING EQUATIONS. CHEMICAL EQUATIONS Chemical Equation: Represents, with symbols and formulas, the identities and relative molecular or molar amounts.

How to balance chemical equations.

Balancing Equations. Law of Conservation of Mass States matter can neither be created nor destroyed. Thus, atoms are neither created nor destroyed, only.

Chemical Reactions. Learning target: I can balance chemical equations. Why learn this? This concept introduces you to the idea that matter is not created.

Balancing Equations Balancing, Writing, and Naming Equations.

Semester 1 Chemistry Review DAY 2 Formula Weight Find the formula weight of aluminum sulfate. Al 2 (SO 4 ) 3 Al - 2 x = S - 3 x =

Counting Atoms and Balancing Chemical Equations. Elements, Compounds, Mixtures Hydrogen is an element. Hydrogen is an element. Oxygen is an element. Oxygen.

Chemical Reactions: The Law of Conservation of Mass.

Describing Reactions What is a chemical equation? What is a balanced equation? How can equations be checked for balance?

Balancing Equations Balancing, Writing, and Naming Equations.

CHEMICAL EQUATIONS & REACTIONS. Describing Reactions  What is a Chemical Reaction?  Occurs when compounds are mixed (sometimes with help)  Chemical.

Law of Conservation of Mass. causes a chemical change, which creates a new substance with new and different properties.

Balancing Chemical Equations. Chemical Equations Review  Chemical equations need to be balanced due to the Law of Conservation of Mass.  This law states.

Balancing Equations Balancing, Writing, and Naming Equations.

CHEMICAL REACTIONS! Chapter 11. Chemical reactions are occurring around us all the time: 1. Food cooking 2. Fuel being burned in a cars engine 3. Digesting.

Chemical Formulas and Equations. Parts of a formula Coefficient: the number in front of the symbol, which tells you how many molecules there are. Subscript:

Get out : Balancing Work Balancing Equation Notes Finish working on Balancing DUE FRIDAY.

COUNTING ATOMS & BALANCING EQUATIONS LESSON 6. DO NOT COPY THE FOLLOWING! In grade 9 you learned how to count the number of different types of atoms in.

Law of Conservation of Mass

Balancing, Writing, and Naming Equations

Unit 6 – Lesson 1 Chemical Reactions.

Reaction Equations.

The Law of Conservation of Mass:

Unit 6 – Lesson 1 Chemical Reactions.

Law of Conservation of Mass

Law of Conservation of Mass:

Balancing, Writing, and Naming Equations

Law of Conservation of Mass

The left side of the equation contains the reactants, which interact to form the new substances, or products. The products are on the right side.

Presentation transcript:

Balancing Chemical Reactions

Balancing Chemical reactions obey the law of conservation of matter which states that matter is neither created nor destroyed, it only changes forms (becomes rearranged) the number of atoms on the reactant side must equal the number of atoms on the product side Reactants  products

Reactants Products Mg + 2HCl  MgCl2 + H2 Mass before = mass after (Law of conservation of matter) If the masses before and after are not equal, one of the compounds is in excess and the other is the limiting reagent.

Rules for Balancing Equations 1. Determine the correct formula for reactants and products don’t forget diatomic molecules H2 N2 O2 F2 Cl2 Br2 I2 and polyatomic molecules (more than two) P4 S8 2. Count the # of atoms of each element in the reactants and products 3. Balance each atom using coefficients. Never balance an equation by changing the subscripts 4. Check each atom to be sure that the equation is balanced.

Helpful hints: All elements have a charge of zero when uncombined. (no ionic charge) Leave H and O until the end If stuck, go back to the beginning and put a 2 in front of the most complex chemical

Examples 1. Aluminum reacts with lead(II) hydroxide to produce aluminum hydroxide and lead.

Examples 1. Aluminum reacts with lead(II) hydroxide to produce aluminum hydroxide and lead. Al + Pb(OH)2  Al(OH)3 + Pb

Examples 1. Aluminum reacts with lead(II) hydroxide to produce aluminum hydroxide and lead. 2Al + 3Pb(OH)2  2Al(OH)3 + 3Pb

Examples 2. Sulfur plus oxygen yield sulfur dioxide

Examples 2. Sulfur plus oxygen yield sulfur dioxide S8 + O2  SO2

Examples 2. Sulfur plus oxygen yield sulfur dioxide S8 + 8O2  8SO2

Examples 3. Sodium sulfate and calcium borate react to make sodium borate and calcium sulfate.

Examples 3. Lithium sulfate and calcium borate react to make lithium borate and calcium sulfate. Li2SO4 + Ca3(BO3 )2  Li3BO3 + CaSO4

Examples 3. Lithium sulfate and calcium borate react to make lithium borate and calcium sulfate. 3Li2SO4 + Ca3(BO3)2  2Li3BO3 + 3CaSO4

Examples 4. Diphosphorus trioxide combines with water to create phosphorous acid.

Examples 4. Diphosphorus trioxide combines with water to create phosphorous acid. P2O3 + H2O  H3PO3

Examples 4. Diphosphorus trioxide combines with water to create phosphorous acid. P2O3 + 3H2O  2H3PO3