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Chapter 11 Chemical Reactions

Chapter 11 Chemical Reactions. Activities and resources. Lab –chemical reactions Workshops TB & Workbooks Animations and games for balancing equations and types of reactions: http://funbasedlearning.com/chemistry/chemBalancer/ques5.htm http://www.youtube.com/watch?v=i-HHvx1VC_8&NR=1

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Chapter 11 Chemical Reactions

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  1. Chapter 11 Chemical Reactions Activities and resources Lab –chemical reactions Workshops TB & Workbooks Animations and games for balancing equations and types of reactions: http://funbasedlearning.com/chemistry/chemBalancer/ques5.htm http://www.youtube.com/watch?v=i-HHvx1VC_8&NR=1 http://www.youtube.com/watch?v=tE4668aarck&feature=related • Writing Chemical equations • Balancing Equations • Classifying reactions • Predicting the products • Reactions in aqueous solutions (complete and net ionic equations) • Predicting the formation of a precipitate

  2. 11.1 Writing Chemical Equations • Word Equations • To write a word equation, write the names of the reactants to the left of the arrow separated by plus signs; write the names of the products to the right of the arrow, also separated by plus signs. • Reactant + Reactant  Product + Product

  3. 11.1 Writing Chemical Equations • Methane + Oxygen  Carbon dioxide + Water • (the reaction between methane and oxygen can be described as a combustion reaction.)

  4. 11.1 Writing Chemical Equations • iron + oxygen  iron(III) oxide • (the reaction between Fe and O2 to form Fe2O3 can be described as a combination or synthesis reaction)

  5. 11.1 Writing Chemical Equations • Chemical Equations • A chemical equation is a representation of a chemical reaction; the formulas of the reactants (on the left) are connected by an arrow with the formulas of the products (on the right).

  6. 11.1 Writing Chemical Equations

  7. 11.1 Writing Chemical Equations • A skeleton equation is a chemical equation that does not indicate the relative amounts of the reactants and products. (i.e. the equation is not yet balanced) • Here is the equation for rusting: • Fe + O2 Fe2O3 • How would you balance this equation?

  8. 11.1 Writing Chemical Equations • A catalyst is a substance that speeds up the reaction but is not used up in the reaction. • Without Catalyst With Catalyst

  9. for Conceptual Problem 11.1

  10. 11.1 Balancing Chemical Equations • Balancing Chemical Equations • What are the steps in writing a balanced chemical equation? • To write a balanced chemical equation, first write the skeleton equation. Then use coefficients to balance the equation so that it obeys the law of conservation of mass.

  11. 11.1 Balancing Chemical Equations • A chemical reaction is also described by a balanced equation in which each side of the equation has the same number of atoms of each element and mass is conserved.

  12. Go to following website for balancing chemical equation game: http://funbasedlearning.com/chemistry/chemBalancer/ques5.htm Complete worksheet (class handout) and turn in for grading

  13. for Conceptual Problem 11.2

  14. for Conceptual Problem 11.2

  15. 11.1 Section Quiz. • 11.1.

  16. 11.1 Section Quiz. • 1. Propane gas reacts with oxygen to produce water vapor and carbon dioxide. Choose the correct word equation for this reaction. • propane + carbon dioxide  water + oxygen • propane + oxygen + water  carbon dioxide • propane + oxygen + water + carbon dioxide • propane + oxygen  water + carbon dioxide

  17. 11.1 Section Quiz. • 2. Which of the following is a skeleton equation? • H2 + CO  CH3OH • 2H2 + CO  CH3OH • 2H2 + CO2 CH3OH • hydrogen + carbon monoxide  methanol

  18. 11.1 Section Quiz. • 3. What coefficient for H2SO4 is required to balance the following equation? • Ca3(PO4)2 + ____ H2SO4 3CaSO4 + 2H3PO4 • 1 • 2 • 3 • 4

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