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Chemical Reactions

Discover the essence of chemical reactions - the transformation of substances through bond breaking and forming. Learn about reactants, products, John Dalton's Atomic Theory, and the Law of Conservation of Mass. Dive into word equations and examples to grasp the fundamentals.

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Chemical Reactions

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  1. Chemical Reactions BY: Daniel Joffe Mike Genovese

  2. What is a Chemical Reaction? The changing of substances to other substances by the breaking of old bonds and the formation of new bonds.

  3. Examples of Chem. Reactions • 1. Digesting Food- http://digestive.niddk.nih.gov/ddiseases/pubs/yrdd/ • 2. Photosynthesis- http://biology.clc.uc.edu/courses/bio104/photosyn.htm • 3. Rust-http://www.corrosionist.com/What_chemical_reaction_is_rust.htm

  4. Reactants and ProductsYIELD!!!!!!!!!! Reactant+ Reactant Product A chemical reaction breaks new bonds and creates new bonds The substances going into the reactants. The new thing that forms from the reaction is called a product This is spoken as, “____ reacts with ____ to produce ____”

  5. John Dalton’s Atomic Theory - All matter is made of atoms - In a chemical reaction the atoms are joined together in different ways. - As products are produced, bonds that hold the atoms together are broken. - New bonds are formed.

  6. John Dalton’s Atomic Theory Law of Conservation of Mass • Matter itself can never created or destroyed. • “Matter, though divisible in an extreme degree, is nevertheless not infinitely divisible. That is, there must be some point beyond which we cannot go in the division of matter. ... I have chosen the word “atom” to signify these ultimate particles.” – John Dalton

  7. Word Equations • Elements and Compounds can be reactants • Compounds are the products • Reactants to products formulas are written as… • ____ + ____ ____ + ____

  8. Word Equations Examples • Iron + oxygen Iron(III) oxide • Hydrogen peroxide Water + Oxygen

  9. Question 1 • Chemical reactions create and break down… • A. Proton Orbitals • B. Chemical Nuclei • C. Chemical Bonds • D. None of the above

  10. Question 2 • The arrow pointing from the reactants to the products is said as_______ when speaking a reaction formula? • A. Stop • B. Yield • C. Form • D. Joined

  11. Homework! Write a word equation for the following chemical reaction… Water is formed by an explosive reaction between oxygen and hydrogen.

  12. Extra Practice • Textbook pages 175-177 • PQP’S #33-34 on page 202

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