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Published byJason Watkins Modified over 9 years ago
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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.
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#43. Balance the following equations:
a. PbO2 PbO + O2 2 2 b. Fe(OH)3 Fe2O H2O 2 3 c. (NH4)2CO3 NH H2O + CO2 2 d. NaCl H2SO4 Na2SO HCl 2 2
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single product Every combination reaction has a
#44 What is a characteristic of every combination reaction? Every combination reaction has a single product. example: 2H O2 2H2O single product
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#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
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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 2H O2
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#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 H2O
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#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) H2 3
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#49 write a balanced equation
for each of the following double- replacement reactions. a. H2C2O4(aq) KOH(aq) 2H2O K2C2O4 b. CdBr2(aq) Na2S(aq) CdS NaBr
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oxygen on the left side #50 What is common to all combustion
reactions? oxygen on the left side example: C4H O2 CO H2O
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#51 Write a balanced equation for the complete combustion of each
compound. a. Butene (C4H8) C4H O2 CO H2O b. acetone (C3H6O) C3H6O O2 CO H2O
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#52 Balance each equation and identify its type.
a. Hf N2 Hf3N4 3 2 a combination reaction b. Mg H2SO4 MgSO H2 a single-replacement reaction c. C2H O2 CO H2O 2 7 4 6 a combustion
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#52 Balance each equation and identify its type. continued….
d. Pb(NO3) NaI PbI NaNO3 2 2 a double-replacement reaction e. Fe O2 Fe2O3 4 3 2 a combination reaction
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