Question

Referring to an activity series, which of the following combinations of reactants would not produce a successful single-replacement reaction?
K + CaO
Al + NiO
Ca + Al2O3
Zn + BaO

Please help!!

Answer 1

@phi

Answer 2

Which of the following pairs does not share the same empirical formula? C2H6 and C4H12 C3H6O3 and C2H4O2 C3H8O and CH2O C2H6 and CH4?
Chemistry ASAP

Answer 3

I'll give medals anything just please help

Answer 4

watch this
http://study.com/academy/lesson/the-activity-series-predicting-products-of-single-displacement-reactions.html

Answer 5

Okay so can we work through them? @richarddelfin

Answer 6

@ricardodelfin

Answer 7

I'm thinking D for the first question and D for the last question

Answer 8

@abb0t

Answer 9

@jagat2713
@photon336
@rvc

Answer 10

@jagar2713

Answer 11

Yes, your first question is D. Because Zn is less reactive than Ba. You can check it in the activity series list.

Answer 12

And the second?

Answer 13

So Zn will never replace Ba

Answer 14

If 4.0 miles of X and 4.0 moles of Ay react according to the hypothetical reaction below, how many miles of the excess reactant will be left over at the end of the reaction? 2X + 3Y ==> Xsub2Y sub 3
1.3 y left over
2.7 y leftover
1.3 x left over
2.7 x left over

I'm thinking C but I'm not sure

Answer 15

In the second one you just have to simplify.
a) C2H6 - C4H12 / They both come from the same empiric formula CH3 (see if i multiply CH3 by 2, i get the first formula and if do it by 4 i get the other one)
b) C3H6O3 -C2H4O2 / Empiric formula for this pair is CH2O, 1st is multiplied by 3 and 2nd is multiplied by 2

Feel free to do the other one.
Hint: U can't simplify 1 atom. Like i didnt keep reducing CH2O or CH3

Answer 16

Ok so D does not reduce right?

Answer 17

For #2

Answer 18

I don't think you're even trying.

About your third question
Indeed, 1.3 moles of X are left over, and Y is the limiting reactant, because if you wanted to react 4 mol of X you would need 6 mol of Y, which you dont have.

Answer 19

and i'd say there are 2 answers in #2, C and D

Answer 20

See this is why I'm confused

Answer 21

I'm Only allowed one

Answer 22

Which one is the better choice

Answer 23

@ricardodelfin

Answer 24

Go for C, since they maybe made a mistake at D and typed C2H6 instead of C2H8.

Answer 25

I'll double check let me see

Answer 26

Your right! These are the choices.
1. C2H6 & C6H18
2. C3H6O3 & C2H4O2
3. C3H6 & CH4
4. CH2O & C3H6O3

Answer 27

I'm leaning toward d again am I right? @ricardodelfin

Answer 28

@nincompoop

Answer 29

@ricardodelfin

Answer 30

Please someone help with the second question I've been working on this exam since 8pm & this is my last question please help me w/ #2