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Chemical Reactions

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Writing Reactions,Write balanced molecular equations for the two reactions you performed and the five reactions in the video (http://www.youtube.com/v/i-HHvx1VC_8&hl=en). Keep the following in mind:
- select the type of reaction.
- include all state symbols like (s), (l), (g), or (aq).
- Type NONE if there is no total or net ionic equation for the reaction.

(A) CuSO4(aq) + Al(s) --> ?
reaction type
• Molecular =
• total ionic =
• net ionic =

(B) CuSO4(aq) + CaCl2(aq) --> ?
reaction type
• Molecular =
• total ionic =
• net ionic =

(C) Watch the video (http://www.youtube.com/v/i-HHvx1VC_8&hl=en). Pause it as necessary. Write the appropriate reactions as you did for A and B. Type NONE if there is no total or net ionic equation.
i) Cu(s) + S(g) --> ?
reaction type
• Molecular =
• total ionic =
• net ionic =

ii) Ca(OH)2(s) --> ?
reaction type
• Molecular =
• total ionic =
• net ionic =

iii) Fe2O3(s) + Al(s) --> ?
TIP: What state is indicated by 'molten'?
reaction type
• Molecular =
• total ionic =
• net ionic =

iv) KI(aq) + Hg2(NO3)2(aq) --> ?
TIP: Mercury(I) actually forms a dimer and is typically found as Hg2+2. Treat it like a polyatomic ion.
reaction type
• Molecular =
• total ionic =
• net ionic =

v) CH4(g) + O2(g) --> ?
reaction type
• Molecular =
• total ionic =
• net ionic =

Results

For the following calculations, please note that you are starting with the hydrates of copper(II) sulfate (CuSO4.5H2O) and calcium chloride (CaCl2.2H2O). The waters will not affect the reactions, but they do affect the molar mass of the substance and therefore the moles of substance.

Reaction A
Calculate the theoretical mass of copper for Reaction A. (**Keep 2 significant figures here so that we can avoid rounding issues...Previously, I stated "round this mass to one decimal place since that is all the digital balance can measure" but that is not working.)

Calculate the percent yield of copper for Reaction A to two significant figures.

Reaction B
Calculate the theoretical mass of precipitate for Reaction B. (**Keep 2 significant figuress here so that we can avoid rounding issues...Previously, I stated "round this mass to one decimal place since that is all the digital balance can measure" but that is not working.)

Calculate the percent yield of precipitate for Reaction B to two significant figures.

List at least three errors that may have affected the percent yield.

Video Reactions - Observations
Describe each reaction. (What were the ways that you could tell a reaction was taking place? List the evidence for each reaction.
i) Cu(s) + S(s) --> ?
ii) Ca(OH)2(s) --> ?
iii) Fe2O3(s) + Al(s) --> ?
iv) KI(aq) + Hg2(NO3)2(aq) --> ?
v) CH4(g) + O2(g) --> ?

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Solution Summary

The expert writes reactions and balanced molecular equations for two reactions.

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Write balanced molecular equations for the two reactions you performed and the five reactions in the video (http://www.youtube.com/v/i-HHvx1VC_8&hl=en). Keep the following in mind:
- select the type of reaction.
- include all state symbols like (s), (l), (g), or (aq).
- Type NONE if there is no total or net ionic equation for the reaction.

(A) CuSO4(aq) + Al(s) -->)
reaction type: Single Displacement Redox Reaction
• Molecular = 3CuSO4(aq) + 2Al(s) --> Al2(SO4)3(aq)+3Cu(s)
• total ionic =3Cu2+(aq) + 3SO42-(aq) + 2Al(s) = 2Al3+(aq) + 3SO42-(aq)+ 3Cu(s)
• net ionic =3Cu2+(aq) +2Al(s) = 2Al3+(aq) + 3Cu(s)

(B) CuSO4(aq) + CaCl2(aq) --> ?
reaction type: Precipitation Double Displacement Reaction
• Molecular = CuSO4(aq) + CaCl2(aq) -->CuCl2(aq) + CaSO4(s)
• total ionic = Cu2+(aq) + SO42-(aq) + Ca2+(aq)+2Cl-(aq) --> Cu2+(aq) +2Cl-(aq) +CaSO4(s)
• net ionic = Ca2+(aq) + SO42-(aq) --> CaSO4(s)

(C) Watch the video (http://www.youtube.com/v/i-HHvx1VC_8&hl=en). Pause it as necessary. Write the appropriate reactions as you did for A and B. Type NONE if there is no total or net ionic equation.
i) Cu(s) + S(g) --> ?
reaction type : Synthesis/Combination Redox Reaction
• Molecular = Cu(s) + S(g) --> CuS(s)
• total ionic =NONE
• net ionic = NONE

ii) Ca(OH)2(s) --> ?
reaction type: Decomposition Redox Reaction
• Molecular = Ca(OH)2(s) -->CaO(s) +H2O(l)
• total ionic = NONE
• net ionic = NONE

iii) Fe2O3(s) + 2Al(s) --> 2Fe (l)+ Al2O3(s)
TIP: What state is ...

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