To change the subscripts like that actually changes the product to a

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Presentation transcript:

To change the subscripts like that actually changes the product to a #42 The equation for the formation of water from its elements, H2 (g) + O2(g)  H2O(l) can be “balanced” by changing the formula of the product to H2O2. Explain why this is incorrect. To change the subscripts like that actually changes the product to a totally different one. You cannot touch the subscripts to “balance” the equation, only add coefficients.

#43. Balance the following equations: a. PbO2  PbO + O2 2 2 b. Fe(OH)3  Fe2O3 + H2O 2 3 c. (NH4)2CO3  NH3 + H2O + CO2 2 d. NaCl + H2SO4  Na2SO4 + HCl 2 2

single product Every combination reaction has a #44 What is a characteristic of every combination reaction? Every combination reaction has a single product. example: 2H2 + O2  2H2O single product

#45 Write balanced chemical equations for the following combination reactions. a. Mg + O2  2 2MgO b. P + O2  diphosphorous pentoxide 4P + 5O2  2P2O5 c. Ca + S  CaS

a decomposition always has a single reactant. example: #46 What is a distinguishing feature of every decomposition reaction? a decomposition always has a single reactant. example: 2H2O  2H2 + O2

#47 Write a balanced chemical equation for each decomposition reaction: Ag + O2 a. Ag2O(s)  4 2 b. ammonium nitrate  dinitrogen monoxide + water NH4NO3  N2O + 2H2O

#48 Use the activity series of metals to write a balanced equation for each single-replacement reaction. NO reaction. K is higher on the chart than Au a. Au(s) + KNO3 b. Zn(s) + AgNO3  2 Zn(NO3)2(s) + Ag 2 c. Al(s) + H2SO4  2 3 Al2(SO4)3 + H2 3

#49 write a balanced equation for each of the following double- replacement reactions. a. H2C2O4(aq) + 2KOH(aq)  2H2O + K2C2O4 b. CdBr2(aq) + Na2S(aq)  CdS + 2NaBr

oxygen on the left side #50 What is common to all combustion reactions? oxygen on the left side example: C4H8 + 6O2  4CO2 + 4H2O

#51 Write a balanced equation for the complete combustion of each compound. a. Butene (C4H8) C4H8 + 6O2  4CO2 + 4H2O b. acetone (C3H6O) C3H6O + 4O2  3CO2 + 3H2O

#52 Balance each equation and identify its type. a. Hf + N2  Hf3N4 3 2 a combination reaction b. Mg + H2SO4  MgSO4 + H2 a single-replacement reaction c. C2H6 + O2  CO2 + H2O 2 7 4 6 a combustion

#52 Balance each equation and identify its type. continued…. d. Pb(NO3)2 + NaI  PbI2 + NaNO3 2 2 a double-replacement reaction e. Fe + O2  Fe2O3 4 3 2 a combination reaction