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Author Topic: Double displacement homework help? (URGENT)  (Read 391 times)

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gasstationqueen

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Double displacement homework help? (URGENT)
« on: January 09, 2017, 05:46:00 PM »

I am so stressed right now and am on the verge of a nervous breakdown. My chemistry homework is just really confusing and I need to pass this class, could someone please help me out? :( I need to hand this in tomorrow and I have already answered the questions myself but I feel like my answers are all wrong. I would appreciate it if someone could show me how to solve these so I know that when I hand this in tomorrow it won't bring my grade down even lower.

Complete and balance following equations: (find reactants and products)
1.Reactants: KOH+H2SO4
2.Reactants: FeS+HCl
3.Reactants: NaCl+H2SO4

If reaction occurs, list products. If no reaction occurs, state "no reaction":
1.Reaction: CaBr2+KOH
2.Reaction: Cu(OH)2+HC2H3O2
3.Reaction: FeS+2HCl
4.Reaction: Ca(NO3)2+2HCl

My attemps: 1. H2SO4(aq) + 2KOH(aq) --> K2SO4(aq) + 2H2O(l)
2. FeS + 2HCl ------> FeCl2 + H2S
3. 2NaCl + H2SO4 = Na2SO4 + 2HCl(g)

1. CaBr2 + KOH = CaOH + KBr2
2. Cu(OH)2 + 2 HC2H3O2 = Cu(C2H3O2)2 + 2 H2O
3. ?
4. No reaction ?

Idk what it nmeans by finding products :/ I swear I'm not an airhead lol, I had a medical issues that caused me to miss a lot of school and now I am very behind.
« Last Edit: January 09, 2017, 06:43:25 PM by gasstationqueen »
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AWK

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Re: Double displacement homework help? (URGENT)
« Reply #1 on: January 09, 2017, 06:12:47 PM »

And where is your attempt?
According to forum rules "whenever asking questions show you have already tried to solve them on your own"
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gasstationqueen

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Re: Double displacement homework help? (URGENT)
« Reply #2 on: January 09, 2017, 06:41:53 PM »

And where is your attempt?
According to forum rules "whenever asking questions show you have already tried to solve them on your own"

I added my attempts. Sorry, I'm new to this forum so I wasn't aware of all the rules.
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KungKemi

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Re: Double displacement homework help? (URGENT)
« Reply #3 on: January 09, 2017, 07:34:12 PM »

Okay, well, a good place to start is to consider the relative oxidation states of each of the following ions. This can best be done by referring to your chemistry textbook for polyatomic ions (e.g: OH-), and the periodic table for Group 1A, 2A, 5A, 6A, 7A elements. The Group 1A, and 2A elements will always have +1 and +2 charges (except for hydride; which is -1) respectively when in ionic form, and the Group 5A, 6A, and 7A elements will typically have -3, -2, and -1 charges respectively when in ionic form.

I hope that this helps,
KungKemi
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Re: Double displacement homework help? (URGENT)
« Reply #4 on: January 09, 2017, 08:32:40 PM »

KungKemi, these above are not redox reactions.
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Borek

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Re: Double displacement homework help? (URGENT)
« Reply #5 on: January 09, 2017, 08:34:32 PM »

Idk what it nmeans by finding products

Predict them.

My attemps: 1. H2SO4(aq) + 2KOH(aq) --> K2SO4(aq) + 2H2O(l)
2. FeS + 2HCl ------> FeCl2 + H2S
3. 2NaCl + H2SO4 = Na2SO4 + 2HCl(g)

These three look OK, with one remark: last reaction requires solid NaCl and concentrated acid, and your teacher may want you to list a slightly different version (sulfuric acid doesn't react to the end).

Quote
1. CaBr2 + KOH = CaOH + KBr2

Calcium hydroxide formula is wrong. Plus, this equation doesn't make much sense without marking state of each substance ((aq), (s)).

Quote
2. Cu(OH)2 + 2 HC2H3O2 = Cu(C2H3O2)2 + 2 H2O

Add (aq) and (s) where appropriate.

Quote
3. ?

You have already listed this reaction in the first part. Again, add state symbols.

Quote
4. No reaction ?

It may depend on whether you mix solid with a concentrated acid or if you mix solutions. Assuming the latter - you are right.
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Re: Double displacement homework help? (URGENT)
« Reply #6 on: January 09, 2017, 08:45:26 PM »

H2S is gaseous.
KBr2 formula is wrong.
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