On 15 Oct 2006 22:52:11 -0700, "Walt" <gwjones24@[EMAIL PROTECTED]
> wrote:
>>
>> >Using the equation below complete the statements below
>> >Na + AgCl -> NaCl +Ag
>> >
>> >
>> >A. This is a (single replacement/decompostion) reaction.
> So this is a single replacement reaction
yes
>as the chlorine element is
>the replacement element,
This may be a terminology point; books may differ on how they describe
the same thing. So if your book says differently than what I say,
follow the book -- for now.
The more common description would be to say that the sodium replaces
the silver (in the sense of being what is "joined" with the Cl).
I am not familiar with the term "the replacement element", but perhaps
this book uses it -- and defines it.
>and it is a balanced equation.
>
Well, yes. But again, what is im****tant is to understand how you tell.
In high school chem, the student will learn to make equations
balanced. And a key part of that is knowing how to tell. [I see; you
discussed this below. I'll leave what I wrote here anyway.]
An equation is balanced when there is the same number of each kind of
atom on each side -- noting is created or destroyed. In this case,
there is one each of Ag, Na, Cl -- on each side. balanced.
H2O --> H2 + O2 is NOT balanced -- cuz there are 2 O on the right, but
only one on the left.
Note that the idea of an eqn being balanced is closely related to the
conservation of mass, which you already invoked. Conservation of mass
is something we can observe; the reason for it is that atoms just
"move around", but are not created or destroyed (in chemical
reactions).
>
>> >B. The mass of Na +AgCl must equal the mass of AG / NaCL + Ag). I
>> >don't think this means division, but are the choices for the answer.
>
>> > My Answer is NaCl + Ag (law of conservation of matter, I think)
yes
>
>> >C. One of the reactants in this equation is (na/NaCl)
>> The reactants are at the begining or to the left of the equation
yes -- the things that react (that are present at the beginning)
>so the reactant is sodium (Na) and the chlorine (Cl).
The eqn is
Na + AgCl -> NaCl +Ag
So your answer there does not agree with the reason you just gave. The
eqn has Na and AgCl on the left; those are the reactants.
>>
>> What does the word reactant mean? Where are reactants in a chemical
>> equation -- any chemical equation?
>>
>>
>> >D. One product of this equation is (AgCl/NaCl)
>
>> > So the product of this equation is NaCl
yes (along with Ag). Products are on the right.
>
>> >E. This equation is (balanced/unbalanced)
>> >
>> >
>> > The equation is balanced because the elements are the same on
each side of the equation. .
More precisely, the same amount of each element. See comment above.
>> > >
>> >
>> >F. The nonmetal ion is this equation is (Ag+1 /CL-1)
>>
>> Ag is silver so this is the metal, making Cl the non metal.
Yes, but I am inclined to suggest that is a weak explanation.
Non-metals are recognized on their own, not simply by exclusion. H2O
(water) contains two non-metals.
In general, non-metals are on the right hand side of the periodic
table (plus hydrogen). Look at your periodic table. Is there a zig-zag
line near right side (starting next to aluminum)? If so, that line is
the (somewhat arbitrary) dividing line between metals and non-metals.
Again, if your book presents this differently for now, so be it.
Another possible approach... You (correctly) gave the charge for each
Ag (+1) and Cl (-1). In that case, the nonmetal is the one with a neg
charge (the "anion").
Much progress!
Learning to look things up is a great skill for a young student to
learn. It is often more im****tant to know how to find information than
it is to "know" all the details. (Unfortunately, our system does not
always emphasize that right.)
bob
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