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9th Grade Chapter 7 Lesson 1
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9th Grade Chapter 7 Lesson 1

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    9th Grade Chapter 7 Lesson 1 9th Grade Chapter 7 Lesson 1 Presentation Transcript

    • Pgs. 155-162 For Student Use Only 9 th Grade Chapter 7 Lesson 1
    • Question 1 What is a chemical reaction?
      • A. Can results from molecules colliding with each other
      • C. Molecules can combine or break apart
      • B. Starts with chemical changes
      • D. A chemical change resulting from a collision between atoms or molecules
    • Key
      • 1) A,B,C,D
    • Chemistry is Everywhere
      • Student generated ideas:
      • Explain which pictures could be showing a chemical reaction. Explain why you chose that picture.
      • Pic 2= because if you mix different chemicsls you can get different colors
      • Pic. 4: shows molecules combinig and breaking apart
      • Pic 5= fire is putting in enerrgy to create a reaction by helping milescules combine
    • Chemistry is Everywhere
      • Chemical Reactions
        • Original substances are changed into something different
        • Reactants= chemical substances that undergo changes
        • Products= things that are produced in the chemical reaction
      • Reaction of sulfuric acid and sugar. The acid dehydrates the sugar forming a pillar of carbon (black) and steam.
      http://www.scienceclarified.com/images/uesc_09_img0486.jpg
    • Chemistry is Everywhere
      • Student generated ideas:
      • Write any chemical equations you can think of with the help of the pictures over to the side.
    • Chemistry is Everywhere
      • Chemical Equations:
      • The reactants are on the left side of the equation
      • The products are on the right side of the equation
        • 2H 2 + O 2 = 2H 2 O
      • Coefficient tells how many molecules of the substance are in the reaction
      • Subscript tells how many atoms of molecules are present
      H 2 + Cl 2   -->   2 HCl http://www.personal.kent.edu/~cearley/ChemWrld/balance/balance.htm
    • Chemistry is Everywhere
      • Student generated ideas:
      • What type of chemical reactions take place in baking a cake?
    • Chemistry is Everywhere
      • Chemical Reactions:
      • Law of conservation of mass:
        • The total mass of the reactants is equal to the total mass of the products
        • Atoms are conserved in chemical reactions and have to be balanced
      http://www.winsite.com/info/images/1500000035527/methane.gif
    • Chemistry is Everywhere
      • Student generated ideas:
      • How do you plan to balance equations? What do you need to know to balance equations?
    • Chemistry is Everywhere
      • Balancing Chemical Equations:
      • RULES:
        • 1. Remember that only the coefficients on an equation NOT the molecular formulas may be adjusted
        • 2. Balance the element with the largest subscript first
        • 3. In an equation involving a pure element and one or more compounds balance the pure element last
      http://www.winsite.com/info/images/1500000035527/methane.gif
    • Energy is everywhere
      • List all the ways that chemistry will produce energy in the pictures to the side.
    • Chemistry is Everywhere
      • Energy in Chemical Reactions:
      • Activation Energy: Energy put into the reaction to make the reaction happen
      • Exothermic reaction- releases energy
      • Endothermic reaction- produce energy
    • Chemistry is Everywhere
      • Energy in Chemical Reactions:
      • 2 nd law of thermodynamics states:
        • Energy and matter always tend to head toward less usable energy and greater disorder (called entropy- amount of disorder or decay)
        • Also- in every physical and chemical reaction, some of the energy cannot be used again
    • Energy is everywhere
      • Based on the pictures what is one factor that affects reactions.
    • Chemistry is Everywhere
      • Factors that affect chemical reactions:
      • Temperature: an increase in temperature will usually speed up a rxn (reaction) (due to more kinetic energy and colliding of particles)
      • Concentration: increased concentration increases the rate of rxn- (more particles to collide)
    • Chemistry is Everywhere
      • Factors that affect chemical reactions:
      • Surface Area: the surface area of the of the reactants increases the speed of the reaction (more area for molecules to collide)
      • Catalysts: a substance that speeds up a reaction without being permanently changed (this lowers the amount of activation energy)