CHEMISTRY HELPP! MEEE plzzz?

Question

ok so
pWrite the balanced chemical equation for the reaction of zinc metal Zn(s) in aqueous copper (II) bromide, CuBr2 (aq)

___________(s)+__________ (aq) -> ______(aq)
+ _______(s) (single replacement reaction


2. how many moles is in .69 grams of Zn??


3 Using the answer above and the proper mole ration from the balanced equation , how many moles of the solid copper will form??



4.Finall how many grams of copper are in the moles of copper calculated in step 3


5 was the reaction endo thermic or exo thermic???




guys plzz help out and explain wat u did im having a hard time wid chemistry and the teacher shouldnt even have a teaching license

Answer 1

I think you are someone who wants to work this out yourself, and not just copyi down what someone tells you.

In (1) your reagents are solid zinc and dissolved CuBr2. (s) means solid, (aq) means dissolved in water. It is a single displacement, so you are left with a solid which is not zinc, and something which is not copper bromide in solution. (Let me gie you another hint; the solid product is a metal, and the dissolved product is a metal bromide).

2: number of moles = number of grams divided by molar (in this case, atomic) mass.

3. GIVEAWAY! This question tells you that copper metal was the solid in (1). if you look up the formula of any compound of zinc, you will see that ONE zinc displaces ONE copper.

So the number of moles of copper in (3) is equal to the number of moles of Zn in (2).

4. Now you know the number of moles of copper, you can multiply by the atomic mass of copper to get the number of grams of copper.

5. The reaction goes. This suggests that it is exothermic. However, there are some endothermic reactions that nonetheless go. So I think it is not possible to be certain, from the information that you are given.

Answer 2

1. Zn(s) + CuBr2(aq) -> ZnBr2(aq) + Cu(s)
single replacement so just switch the Cu and the Zn

2. 1 mole is 65.37grams
.69/x = 65.37/1
x = .010553

The rest should be done by yourself...
I have given you a head start and really I am not going to do all your hw for you so sorry...

((Viggy, the reaction should happen
ZnBr2 is a possible product and plus all the other questions prove that a reaction does occur))

Answer 3

hey there, i love chemistry so i will try my best to help you!
Zn (s) + CuBr2 (aq) -> ZnBr2 (aq) + Cu (s)
This happens because zinc is more reactive than copper, so it displaces it.
Moles= mass/Mr. The molecular mass of zinc is 65 and the mass is 0.69g so the number of moles will be:
0.69/65=0.01 moles
The mole ratio of zinc to copper is 1:1 so there will be 0.01 moles of copper.
The mass of copper will be 0.01 moles x Mr
0.01 moles x 35.5 = 0.355g of copper
It is an exothermic reaction

I hope that is all right...i havnt done chemistry for a while but i hope that helps! Please contact me if you need more help...i enjoy it!

Answer 4

i just did this in class today but i forget how :D im sorry good luck maybe get help from a smarter classmate or friend. no teaching license? tell principal or someone with higher authority. change teachers possibly? or GET HELP from someone who can help you. even if i did have the answers i would not just give them to you online. that would not help you at all.

search online too. teach yourself. learn SOMETHING!

Answer 5

This reaction will not happen; if you look on the activity series, copper wants to be oxidized rather than be reduced; but, it is already oxidized so no reaction will occur.

Answer 6

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Answer 7

cheater cheater pumpkin eater!!! ;)