For those who haven't seen my previous post; I request you to go and search for it, it says Lab part 1 on it. You will not know what I'm asking about, if you don't read it it. Overall nothing will make sense. Thank you very much for all your help.

Question

These are my observations in the data table: The object is in the first column and the properties that I recorded for that object are in the second.

Object            |Properties

Copper (II)
Chloride          = blue powder, 
                    sparkly
                    
CuCl2(soln)       = almost clear blue,
                    green at bottom

Aluminum          = shiny, metallic 
                    silver

Reaction
Observation       = aluminum piece is 
                    going brown, the 
                    water is going 
                    darker from the top
                    Bubbles r arising
                    by the aluminum

Filter Residue    = It is dark brown 
                    in colour and looks
                    crusty

Can you please help me add more for the last one = Filter Residue.

Questions:

1.What ions r present in a solutions of copper(iI) chloride? What colour do you think the copper(II) ions are? Explain.

I don't really get the first part. When it says "What ions" does it refer to the size, shape of those ions, meaning how they kind of look like? For the 2nd part I got blue in colour, but I'm not sure if it's supposed to be bluish green.

2.What r the properties of aluminum that confirm it is a metal?

I just wrote that it is silver and shiny like one. - Do I need to add more?

3.What observations convinced u that a chemical reaction was occuring between the aluminum foil & the copper(II) chloride solution?

I wrote: Observations which convinced me that a chemical reaction was occuring beteen the aluminum foil and the copper(II) chloride solution was that the aluminum piece was changing its colour and bubbles were starting to arise. - is this good?

4.What happened to the aluminum atoms in the foil? Explain.

?????????????????????

5.What happened to the copper(II) ions in the solutions? Explain

I just wrote that they began to dissolve.-How would I explain this?

6.What happened to the chloride ions in the solution?

I don't think anything happened to them.

I'll appreciate all the help you could give me, thank you very, very much:-)

DrBob222 · Answer

1.What ions r present in a solutions of copper(iI) chloride? What colour do you think the copper(II) ions are? Explain.
I didn't search for the first part because that's too laborious; however, I think I can HELP answer these questions.

I don't really get the first part. When it says "What ions" does it refer to the size, shape of those ions, meaning how they kind of look like? For the 2nd part I got blue in colour, but I'm not sure if it's supposed to be bluish green.
It's referring to the ions in the CuCl2 solution. You have Cu+2 ions and Cl^-. Cu ions are blue or blue green in almost all of their compounds (some exceptions)

2.What r the properties of aluminum that confirm it is a metal?

I just wrote that it is silver and shiny like one. - Do I need to add more?
I would have said it looked metallic. It is a solid (most metals are solid? right?

3.What observations convinced u that a chemical reaction was occuring between the aluminum foil & the copper(II) chloride solution?

I wrote: Observations which convinced me that a chemical reaction was occuring beteen the aluminum foil and the copper(II) chloride solution was that the aluminum piece was changing its colour and bubbles were starting to arise. - is this good? Yes

4.What happened to the aluminum atoms in the foil? Explain.

?????????????????????
The aluminum metal was dissolving and forming Al^+3 ions in the solution.

5.What happened to the copper(II) ions in the solutions? Explain
The copper(II) ions are coming out of solution (each ion adds two electrons) and forming metallic copper on the aluminum foil.
Cu^+2 + 2e ==> Cu(s)
Al(s) ==> Al^+3 + 3e

I just wrote that they began to dissolve.-How would I explain this?
The copper is not dissolving. The copper ions are already in solution.

6.What happened to the chloride ions in the solution?

I don't think anything happened to them
You are right. The chloride ions started in solution and they stay in solution. They are not part of the reaction. Ions that don't enter the equation are called spectator ions. The net ionic equation is
2Al + 3Cu^+2 ==> 2Al^+3 + 3Cu

Sara · Answer

Thank you very much DrBob222:-)

Anonymous · Answer

oh my god i love this.

students · Answer

i don't get the answer at number 5 though. becaude if the aluminum is a +3 ion charged. i don't know where the ions added the two electrons. ?:|.