Understanding Chemical Reactions

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Presentation transcript:

Understanding Chemical Reactions Chapter 6 test review Understanding Chemical Reactions

Sections We’ve Covered Section 6.1 - Word Equations Section 6.3 - Law of Conservation of Mass Section 6.5 - Balancing Chemical Equations Section 6.6 - Combustion Section 6.7 - Synthesis & Decomposition Reactions Section 6.10 - Single & Double Displacement Reactions

Section 6.1 – Word Equations A chemical reaction is represented by the following word equation: magnesium + sulfuric acid —> hydrogen + magnesium sulfate (a) What are the products of this reaction? (b) What are the reactants in this reaction? Write word equations for the following chemical reactions. (a) Tarnish (Ag2S) forms when a silver spoon is placed in sulfur. (b) KOH and H2 result when H2O and potassium are mixed.

Section 6.3 – Conservation of Mass In all chemical reactions the: (a) mass and volume of both the reactants and the products must be equal. (b) masses of the combining chemicals must be equal. (c) volume of the reactants equals the volume of the products. (d) volumes of the combining reactants must be equal. (e) mass of the reactants equals the mass of the products.

Section 6.5 – Balancing Chemical Equations Balance the following equation: Cu + H2SO4 —> CuSO4 + H2O + SO2

Section 6.6 - Combustion (a) Complete the following equation and balance it. C4H8 + O2 —> ________________ (b) Classify the reaction type Answer (a) C4H8 + 6O2 —>4CO2 + 4H2O

Section 6.7 Synthesis & Decomposition Reactions Balance and classify each of the following as either a synthesis or a decomposition reaction. (a) HgO —> Hg + O2 (b) Al + O2 —> Al2O3 (c) SO3 + H2O —> H2SO4 Answer (a) 2HgO —> 2Hg + O2 decomposition (b) 4Al +3 O2 —> 2Al2O3 synthesis (c) SO3 + H2O —> H2SO4 synthesis

Section 6.10 Single & Double Displacement Reactions Classify each of the following reactions. (a) 2KI + Pb(NO3)2 —> PbI2 + KNO2 (b) Fe + CuSO4 —> Cu + FeSO4 (c) 2Li + H2O —> 2LiOH + H2 (d) Ca(OH)2 + 2HBr —> 2H2O + CaBr2 Answer (a) double displacement (b) single displacement (c) single displacement (d) double displacement

Test Format Multiple Choice Fill in the Blanks Short Answer Write skeleton equation, balance, state reaction type.

Please Complete Chapter 6 Review Questions Page 252 #s 1, 4, 5, 6, 7