Unit I: CHEMICAL REACTIONS I.4 Introduction to Chemical Equations.

Slides:

Advertisements

Similar presentations

UNIT VI Chemical Reactions. VI.1 INTRODUCTION TO CHEMICAL EQUATIONS A chemical reaction (or chemical change) involves the formation of a __________________________.

Advertisements

Chemical Reactions Physical and Chemical Change

Heat and Temperature All particles are always in motion, even in solids. Kinetic energy= The energy of motion. Heat= a measure of the total kinetic energy.

 Matter is classified by its chemical and physical properties.

Section 1 Forming New Substances

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

Deciding between physical and chemical changes

8.1 Describing Chemical Reactions May 12, Describing Chemical Reactions A chemical reaction is the process by which one or more substances are.

Intro to Chemical Reactions.  What is the difference between physical change and chemical change?  How can you be relatively sure that a chemical change.

Chemical Reactions Chapter 20.

Unit 7: Chemical Reactions: Conservation of Mass

CHEMICAL REACTIONS Reactants: Zn + I 2 Product: Zn I 2.

Chemical Reactions Chemical Changes Balancing Chemical Equations 1.

Grade 9 Science: Unit 1: Atoms, Elements, and Compounds

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

Chemical Formulas & Equations 8th Grade Science 2012

CHEMICAL REACTIONS Balancing all things Reactants: Zn + I 2 Product: ZnI 2.

By the end of the period, I will be able to…  Based on observations, determine whether a chemical reaction has occurred  Use appropriate terminology.

Elements & Compounds Notes TEKS: (6.5) Matter and energy. The students knows the differences between elements and compounds Differentiate between elements.

Chemical Reactions.  Atoms interact in chemical reactions: Chemical reaction: produces new substances by changing the way in which atoms are arranged.

1 Chp 7: CHEMICAL REACTIONS Reactants: Zn + I 2 Product: Zn I 2.

CH 8 CHEMICAL REACTIONS AND EQUATIONS SECTIONS 1 AND 2.

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

Section 1Chemical Reactions 〉 When do chemical reactions take place? 〉 Chemical reactions occur when substances undergo chemical changes to form new substances.

Do Now Please write HW in your agenda. Please update your table of contents. Please take the sheets from the front cart and place them in your notebook.

CHEMICALS AND CHEMICAL CHANGE Chapter 5.1 BLM 5.1a, 5.1b.

Chemical Reactions Reactions involve chemical changes in matter resulting in new substances being formed. Reactions involve rearrangement and exchange.

Theme: Changes and Reactions

Chemistry - Science 10 REVIEW Classification of Matter MATTER MIXTURESPURE SUBSTANCES SUSPENSIONS Particles of one of the substances remain partly clumped.

11/30/10http://teachers.yourhomework.com/blowe/1 Today's Agenda.t 11/30/10 Recall – Names Intro to Unit 5 Reactions Balancing Chemical Equations.

Monday January 7, 2013 (Introduction to Chemical Reactions and Equations)

(2.3) Chemical Reaction Evidence (p ). Chemical Reaction In a chemical reaction new substances are always formed. Can you identify a chemical reaction.

Chemical Reaction Notes. Matter is everything around you. Matter is anything made of atoms and molecules. Matter is anything that has a mass.

Coach Dave Edinger J. C. Booth Middle School Physical Science (8A)

1 Describing Matter  Properties used to describe matter can be classified as: 1)Extensive – depends on the amount of matter in the sample - Mass, volume,

Properties and Changes in Matter

Chemical Change: Occurs when one or more substances are changed into new substances with different properties; cannot be undone by physical means.

Changing Matter Physical & Chemical Changes. Matter has properties Two basic types of properties that we can associate with matter. Physical properties.

PHASE CHANGES Unit I - 2 Hebden Chemical and Physical Characteristics of Compounds Property is a characteristic of a material that can be determined.

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.

Chemistry: The Study of Matter. What is Chemistry? The study of the matter, its composition, properties, and the changes it undergoes. The study of the.

Test Review for 3 rd Period. You must end up with the same amount you started with. Mass cannot be created or destroyed Conservation of Mass.

Matter: Properties and Changes

UNIT VI Chemical Reactions Lesson 1. VI.1 INTRODUCTION TO CHEMICAL EQUATIONS A chemical reaction (or chemical change) involves the formation of a __________________________.

CHAPTER 1: MATTER AND CHANGE Chemistry. MATTER AND ITS PROPERTIES Notes Pages 3-4.

CHEMICAL CHANGE CH 3.1 PAGE 68. DEFINITION OF A CHEMICAL CHANGE Chemical changea new substance is formed – the change is almost impossible to undo or.

Balancing Chemical Equations Reactants: Zn + I 2 Product: Zn I 2.

Chemical Equations. Chemical Reactions - OVERVIEW change that occurs when atoms rearrange themselves Can absorb or release energy  Heat  Light  Sound.

Aim: How to write chemical equations? DO NOW: If done with yesterday’s classwork answer the following questions. If not done, continue working on classwork.

Test Review PowerPoint for 5th Period. Reactants are combined together to create products What are the reactants and products in the following equations?

Journal #13 Determine the molecular formula of a compound with an empirical formula of NH2 and a formula mass of amu.

Test Review PowerPoint for 7th Period. Chemical Equations.

Test Review PowerPoint for 6th Period. Chemical Equations.

Chemical Change: Occurs when one or more substances are changed into new substances with different properties; cannot be undone by physical means.

Introduction to Chemical Equations ,

Topic: Chemical Reactions and Equations PSSA: A/S8.C.1.1.

Describing chemical reactions Page 23 of INB. Essential Question: What are the signs that a different substance has been formed by a reaction?

Ch 8 Chemical Equations and Reactions

Physical and Chemical Changes

Chemical Reactions.

Chemistry Chapter 8 – Chemical Reactions

Physical Properties Physical properties can be observed and measured without changing the kind of matter being studied. Examples: Melting point Boiling.

(c) McGraw Hill Ryerson 2007

(c) McGraw Hill Ryerson 2007

Unit 4 Lesson 1 Chemical Reactions

Topic: Chemical Reactions

Changes in Matter.

Chemical Changes.

Unit 3 Chemical Reactions and Quantities

Presentation transcript:

Unit I: CHEMICAL REACTIONS I.4 Introduction to Chemical Equations

Chemical Change One or more new substances are formed in a chemical reaction New substances formed by a chemical reaction or chemical change have properties different from those of the starting materials

Chemical Reactions In chemical reactions  The starting materials are called reactants  The resulting materials are called products

Signs --- that a chemical change has occurred Bubbles of gas appear Precipitate forms  Formation of solids in liquids Change in colour  Clear  cloudy New smells Reactant used up Difficult to reverse Smoke Energy (heat, light, sound) A change in volume A change in conductivity A change in melting or boiling point

Chemical Change

Chemical Reaction Equations equation Is an equation that shows the chemicals used up and produced during a chemical reaction REACTANTS  PRODUCTS

Chemical Word Equation Uses words to describe the REACTANTS and PRODUCTS Eg. Sodium and chlorine react to form sodium chloride

Coefficients the numbers in front of symbols  Refer to the numbers of molecules of each species involved in reaction

Unit I: CHEMICAL REACTIONS I.4 The Conservation Laws

System Part of the universe being studied in a particular location

Closed System CLOSED A CLOSED system nothing can enter or leave the system It exchanges energy (heat and work) but not matter with the environment.

Closed System

Open System Open System Open System  Things can enter and leave the system  It exchanges energy (heat and work) and matter with the environment.

Open System

The Four Laws of Conservation 1. Law of Conservation of Mass The total mass in a closed system does not change during a chemical reaction

The Four Laws of Conservation 2. Law of Conservation of Atoms Total number and type of atoms in a closed system does not change during a chemical reaction Mg Mg Mg Mg Na Whoa! Where did you come from!

The Four Laws of Conservation 3. Law of Conservation of Electrical Charge  The total electrical charge in a closed system does not change during a chemical reaction

The Four Laws of Conservation 4. Law of Conservation of Energy  The total energy in a closed system does not change during a chemical reaction Relative types of energy may change but the total amount of energy remains the same

The Four Laws of Conservation

Hebden Do Exercises 1 and 2 on page 106 and 3 to 5 on page 107