Chemical Reactions Reactions change one or more substances into new substances. [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_07/FG07_01.JPG]

Slides:

Advertisements

Similar presentations

King – Law of Conservation/ Balanced Equations

Advertisements

The Rearranging of Atoms

Chemical Equations and Tests for anions. Chemical Reactions Whenever two elements combine to form a compound a chemical reaction has taken place In a.

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

Chemical Formulas & Equations 8 th Grade Science 2010 H 2 O NaCl CO 2 2H 2 + O 2 = 2H 2 O.

Chemical Equations Chemistry Mrs. Coyle. Chemical Equations: represent chemical reactions Word Equations Skeleton Chemical Equations Balanced Chemical.

Balancing Chemical Equations

Chemical Reactions.

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

CHEMICAL EQUATIONS, SYMBOLS, FORMULAS & LAW OF CONSERVATION 7-5.5, &

What is a chemical formula? 2. View examples of chemical formulas. 3. What is a coefficient? 4. What is a subscript? 5. Differentiate between.

CHAPTER THREE CHEMICAL EQUATIONS & REACTION STOICHIOMETRY Goals Chemical Equations Calculations Based on Chemical Equations The Limiting Reactant Concept.

I can identify the products and reactants in a chemical reaction. I can state the law of conservation of matter. I can determine the number of each atom.

Molecules and Compounds. Compound Formed from 2 or more elements in a specific proportion When combined, new properties are created They contain 2 or.

Energy and Reactions Breaking of bonds requires an input of energy. The formation of bonds requires a release of energy. The total energy that exists before.

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.

Nature of Chemical Reactions Objectives: 1. Describe the Characteristics of a chemical reaction. 2. Distinguish between reactants and products. Key Terms:

Balancing Chemical Equations

Describing Chemical Reactions. Review Physical change – The atomic structure stays the same. – No bonds are broken, and no new bonds are formed. – Their.

What is the Law of Conservation of Mass?

Chapter 9 State Standards: 3.b; 3.f; 5.a; 5.b; 5.c 1Contreras.

Balancing Chemical Equations. Why do we need to Balance Chemical Equations? The Law of Conservation of Mass The # of atoms must stay the same on both.

Chemical Formulas and Equations H 2 O NaCl CO 2 2H 2 + O 2 = 2H 2 O.

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.

4.3 Chemical Equations A Chemical change means new compounds are created. Law of Conservation of Mass: matter is not created or destroyed; atoms are just.

(2.3) Balancing Chemical Equations (p150). Conservation of Mass As we saw in class, the mass of the reactants must equal the mass of the products in a.

Chemical Reactions Equations. Chemical Equations and Reactions Law of conservation of mass – during a chemical reaction, the total mass of the reacting.

Fe iron Pb lead Au gold C carbon Co cobalt K potassium Ne neon N nitrogen.

WHAT WAYS CAN YOU DESCRIBE A CHEMICAL REACTION?

Chemical Equations and Reactions

Equations & Balancing. Outline  Word Equations  Skeleton Equations  Conservation of Mass  Balanced Chemical Equations.

Begin. Chapter 8 Chemical Equations and Reactions.

The Question (Learning Goals)

Describing Chemical Reactions The process by which the atoms of one or more substances are rearranged to form different substances is called a chemical.

Chapters 7 and 8. What is a chemical reaction  A chemical reaction (a.k.a, chemical change) is a process in which one or more substances change into.

(2.3)Conservation of Mass

822 Recognize that in a chemical reaction the mass of the reactants is equal to the mass of the products (Law of Conservation of mass)

Chapter 11 Matter and Change 11.1 Describing Chemical Reactions

Glencoe Physical Science Chapter 21

Balancing Act Atoms are not CREATED or DESTROYED during a chemical reaction. This is the LAW OF CONSERVATION OF MASS. There must be the SAME number of.

(c) McGraw Hill Ryerson 2007 Chemical reactions result in chemical changes. –Chemical changes occur when new substances are created. –The original substance(s),

Writing Chemical Formulas Balancing Chemical Equations.

Why are chemical reactions important??? Chemical reactions allow living things (cells, animals, people, insects) to grow, develop, reproduce, and adapt.

BALANCING CHEMICAL EQUATIONS H 2 + O 2 --> H 2 O.

Unit 10: Energy in Chemical Reactions Cypress Creek High School Chemistry 1L Chapter 10.

Law of Conservation of Mass. Think about the following question: –If you burned a log in the fireplace, would the mass of the products (smoke, ashes,

Chemical Reactions: The Law of Conservation of Mass.

Chemical Reactions Notes. Reactants Products Substances that undergo a change New substances formed Yields or Produces.

The Volcano Experiment. Chemical Formula Represents a substance: – Ex: Water (H2O)

Introduction to Chemical Equations ,

Chemical Equations & The Law of Conservation of Matter.

February 18 th, 2016 Balancing Equations Introduction.

WARM UP Write a balanced chemical equation for the reaction of iron (3+) with atmospheric oxygen, producing rust (iron oxide).

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

Reactants and Products  A chemical reaction is the process by which atoms or groups of atoms in substances are reorganized into different substances.

WARM UP 1.List 6 things that a chemical equation tells you about a chemical reaction.

Today’s Objective The student will be able to recognize if a chemical equation is balanced by counting atoms on reactant and product side.

Writing and Balancing Equations. Chemical Reactions A chemical reaction is the process by which one or more substances are changed into different substances.

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:

7.P.2B.5 Develop and use models to explain how chemical reactions are supported by the law of conservation of matter.

Balancing Chemical Equations

Chemical Equations Reactants Products.

Balancing Equations.

2B.5 Notes Chemical equation

Forming New Substances

Chemical Equations.

Forming New Substances

Read It! 8th Grade Science

Chemical Balancing The Law of Conservation of Mass:

Presentation transcript:

Chemical Reactions Reactions change one or more substances into new substances. [

Octane + Oxygen Gas  Carbon Dioxide + Water C 8 H 18 + O 2  CO 2 + H 2 O Written only using chemical formulas…

Chemical Equations Reactants are the substances at the beginning of the reaction. Products are the substances at the end of the reaction. Reactants  Products

Chemical Equations The arrow (  ) means “produces” or “yields”. Reactions must follow the law of conservation of mass.

Chemical Equations The LCM says that matter is not created or destroyed in a reaction, but always stays the same. Example: Formation of Water H 2 + O 2  H 2 O

[ H 2 + O 2  H 2 O

Chemical Equations H 2 + O 2  H 2 O Coefficients can be placed before chemicals to multiply the number of atoms! 2

H 2 + O 2  2 H 2 O [

Chemical Equations H 2 + O 2  2 H 2 O2

[ 2 H 2 + O 2  2 H 2 O OK!

Chemical Equations H 2 + O 2  H 2 O Started With: “Balanced”: 2H 2 + O 2  2H 2 O What About… H 2 + O 2  H 2 O 2 This is a completely different reaction so it is incorrect!

Chemical Equations Example: H 2 + N 2  NH 3

[ H 2 + N 2  NH 3 H 2 + N 2  2 NH 3 3 H 2 + N 2  2 NH 3 OK!

Chemical Equation Symbols Cu(s) + 2 HCl(l)  2 CuCl(aq) + H 2 (g) Phases of matter can be listed after the chemicals…(aq) means aqueous! Other symbols on pg. 740