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Chemical Reactions Standards Conservation of Matter and Stoichiometry 3a. Students know how to describe chemical reactions by writing balanced equations.

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Presentation on theme: "Chemical Reactions Standards Conservation of Matter and Stoichiometry 3a. Students know how to describe chemical reactions by writing balanced equations."— Presentation transcript:

1

2 Chemical Reactions

3 Standards Conservation of Matter and Stoichiometry 3a. Students know how to describe chemical reactions by writing balanced equations

4 Objectives Identifying the reactants, products and other parts of chemical equations Write word equations from a chemical reaction description Write chemical equations from word equations Identify and include solid (s), liquid (l), gas (s), and/or aqueous (aq) in chemical equations Identify and write the seven diatomic elements

5 Definitions Chemical equation: a precise detailed accounting of both the identities and amounts of reactants consumed and products formed in a reaction Identities: all participants in reaction get named Amounts: how much is specified in equation, (moles) Reactants: the starting substance(s) in a chemical reaction Product: substance(s) formed in a chemical reaction

6 Word equation: description of a reaction without using chemical formulas Reactants: what you start with Products: what is made

7 Catalyst: a substance that speeds up a reaction without being used up; enzymes good example Aqueous: dissolved in water (aq) Diatomic: two of the same atom naturally bound together

8 Writing a Word Equation Hydrogen reacts with oxygen to form water Word Equation: hydrogen + oxygen → water Chemical Equation : H 2 + O 2 →H 2 O ReactantsProduct

9 Diatomic Elements Diatomic: two of the same atom naturally bound together Hydrogen and Oxygen and some others exist bound together. They are always found as a pair, so when you write them write them as H 2, O 2.

10 Diatomic Elements “7”

11 Write the Word & Chemical Equation… Calcium metal reacts with chlorine gas to produce calcium chloride Calcium + chlorine → calcium chloride Ca + Cl 2 → CaCl 2

12 When zinc metal reacts with oxygen gas, solid zinc oxide is formed. Zinc + oxygen → zinc oxide Zn + O 2 → ZnO

13 Carbon dioxide gas and water are produced when methane gas is burned in oxygen. Methane + oxygen → carbon dioxide + water CH 4 + O 2 → CO 2 + H 2 0 Write the Word and Chemical Equation…

14 When zinc metal is placed in a solution of hydrochloric acid, hydrogen gas and a zinc chloride solution are formed. Zinc + hydrochloric acid → hydrogen gas + zinc chloride Zn(s) + HCl (aq) → H 2 (g) + ZnCl 2 (aq) Write the Word & Chemical Equation…

15 Rules for balancing 1. Must have same # of each atom on both sides of the equation 2. Must use coefficients to balance, can not add subscripts

16 Balance the Equation Calcium metal reacts with chlorine gas to produce calcium chloride Calcium + chlorine → calcium chloride Ca + Cl 2 → CaCl 2

17 When zinc metal reacts with oxygen gas, solid zinc oxide is formed. Zinc + oxygen → zinc oxide Zn + O 2 → ZnO

18 Carbon dioxide gas and water are produced when methane gas is burned in oxygen. Methane + oxygen → carbon dioxide + water CH 4 + O 2 → CO 2 + H 2 0

19 When zinc metal is placed in a solution of hydrochloric acid, hydrogen gas and a zinc chloride solution are formed. Zinc + hydrochloric acid → hydrogen gas + zinc chloride Zn(s) + HCl (aq) → H 2 (g) + ZnCl 2 (aq) Balance the Equation

20 WORKSHEET a

21 END


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