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Ionic vs. Covalent Review Symbols in Equations Translating Equations
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Common Core Connection
Objectives Today I will be able to: Apply ionic and covalent naming rules to naming compounds Identify symbols commonly used in equations Identify the 7 diatomic elements Translate an equation from words to symbols Informal assessment – monitoring student interactions as they complete the review game and translating practice Formal assessment – analyzing student responses to the translating practice and exit ticket Common Core Connection Build Strong Content Knowledge
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Lesson Sequence Evaluate: Warm-up
Engage/ Evaluate: Ionic vs. Covalent Naming Review Game Explain: Symbols in Equations Elaborate: Translating Equations Practice Evaluate: Exit Ticket
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Warm Up What are the 5 pieces of evidence for a chemical change?
Name the following compounds Mg3(PO4)2 PBr3 CCl4 PbS Heat energy, light energy, color change, gas emission, formation of a precipitate
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Warm Up What are the 5 pieces of evidence for a chemical change?
Heat energy Light energy Color change Gas emission Precipitate formed Name the following compounds Mg3(PO4)2 = Magnesium Phosphate PBr3 = Phosphorus tribromide CCl4 Carbon tetrachloride PbS = Lead (II) Sulfide Heat energy, light energy, color change, gas emission, formation of a precipitate
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Objectives Today I will be able to:
Apply ionic and covalent naming rules to naming compounds Identify symbols commonly used in equations Identify the 7 diatomic elements Translate an equation from words to symbols
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Homework Finish Translating Equations Practice
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Agenda Warm-up Ionic vs. Covalent Naming Review Game
Symbols in Equations Translating Equations Practice Exit Ticket
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Review
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How many elements are in the compound Cu(OH)2?
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3
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How can we tell apart different elements?
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Each new element begins with a capital letter
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What does the number 4 in NH4 represent?
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It tells us that there are four hydrogen atoms
This is called a subscript
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How many atoms are in the compound Mg(C2H3O2)2?
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Symbols in Chemical Equations
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What is a chemical reaction?
Process of one or more reactants converting to form products with different properties.
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Ways to Represent Chemical Equations
Using words Hydrogen (gas) + Oxygen (gas) water (liquid) Using symbols 2H2(g) + O2(g) 2H2O(l) Symbols are a shorthand way to represent an equation
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What is written on the left side of the equation?
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Reactants H2 + O2 H2O
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What is written on the right side of the reaction?
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Products H2 + O2 H2O
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Coefficient Determines the quantity of each compound present in a reaction Written in front of the compound Example:
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How is a coefficient different from a subscript?
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A coefficient tells us how many of each compound are present in a reaction while a subscript tells us how many of each atom there are.
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What is the coefficient in 4H2?
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4
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What is the subscript in 2NH3?
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PbCl2(s) HCl(l) H2(g) NaCl (aq) Symbol Example What does it mean?
2H2 + O2 2H2O “produces” or “yields”, indicates result of reaction (s) PbCl2(s) Compound is a solid (precipitate) (l) HCl(l) Compound is a liquid (g) H2(g) Compound is a gas (bubbles) (aq) NaCl (aq) Compound is soluble (dissolves) in water but is a solid when not in a solution Reaction in which products can reform into reactants, can go both ways
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Heat is applied, may have word “heat” instead of triangle
Symbol Example What does it mean? Heat is applied, may have word “heat” instead of triangle Other conditions (temperature, pressure, etc.) may be indicated here, or below the arrow Δ
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7 Diatomic Elements More Stable for them to exist with 2 bonded together H2 N2 O2 F2 Cl2 I2 Br2
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Translating Equation Practice
Practice translating the equations from words to symbols
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Exit Ticket Translate the following equation:
Solid mercury (II) oxide breaks down when heated, forming the elements mercury and oxygen. HgO Hg + O2
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