Question

A particular device uses electromagnetism by using electricity to move magnets. The magnets in this device are then used to do work. Which device uses electromagnetism in this way?

A. An electric generator
B. Electricity
C. An oxidation-reduction reaction
D. An electric motor

Answer 1

@toxiclopez

Answer 2

I think D

Answer 3

it was D

Answer 4

thanks

Answer 5

and why do you think its D??

Answer 6

it answer was D

Answer 7

i already passed

Answer 8

D seemed like the only logical one

Answer 9

alright .. well you did good... i had the same one on my test yesterday.. i also pick D and i got it right

Answer 10

lol did u already pass the class?

Answer 11

cuz im on the CST for the unit

Answer 12

yes with A

Answer 13

oh well its going to be hard ..

Answer 14

did u do it online?

Answer 15

yes

Answer 16

apex?

Answer 17

no .. my school has it wibsit .. i forgot the name of it

Answer 18

lol oh

Answer 19

well can u help me with a couple more question?

Answer 20

ill try my best . sure

Answer 21

Which of the following is an example of a galvanic cell?

A. A cell with a nonspontaneous redox reaction
B. A battery that has a negative voltage
C. A cell that has energy added to it
D. A battery that produces electricity

Answer 22

hmm let me think about that one ..

Answer 23

alrigh

Answer 24

@pooja195

Answer 25

i would say D . a battery that produces electricity... sorry if i get it wrong .. i'm still working on cells

Answer 26

its k (:

Answer 27

i just appreciate the help

Answer 28

What is the oxidation state of S in S2O32-?

A. +4
B. +2
C. +3
D. –2

Answer 29

The half-reactions and overall reaction for this voltaic cell are
Zn(s) → Zn2+(aq) + 2 e– Eanode..
 = –0.762 V
Cu2+(aq) + 2 e– → Cu(s) Ecathode
 = 0.342 V
Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) Ecell
 = Ecathode
 – Eanode

= 0.342 – (–0.762) = 1.104 V ... my teacher says think about this first ..

Answer 30

lmao lookin at that just throws me off more

Answer 31

oh sorry
i know but it dose help alot

Answer 32

if i understood it i bet it would help alot

Answer 33

lol

Answer 34

What is a redox reaction?

A. A reaction in which protons have been transferred from one atom to another
B. A reaction in which atoms have been transferred from one compound to another
C. A reaction in which electrons have been transferred from one atom to another
D. A reaction in which mass has been transferred from one reactant to another

Answer 35

do you know geometry?

Answer 36

i got this for my work class

Answer 37

I can help you on the last two questions you asked, if you still need it.

Lets start with: What is the oxidation state of S in S2O32-?

So, as you need to find the oxidation state of S, firstly we will need to find the oxidation state of O (oxygen).
If you look on a periodic table, you will see that oxygen is in group 6. This means it has 6 valence electrons on its outer shell. Each element wants to have a full outer shell, just like the noble gases. A full outer shell of electrons consist of 8 electrons, so that means oxygen is 2 away from having a full shell.

So, electrons have a negative charge, and the ion it forms has a full outer shell. So as we said before, oxygen needs 2 more electrons to be full. This means it charge will be 2, however we dont know if its a positive or negative charge yet.

But, this is easy to figure out. Electrons are negative. If an element has more of a negative thing, it will have more of a negative charge. Same as if it had more protons, which have a positive charge, it would become more positive. Because oxygen NEEDS electrons, it will have more of a negative thing. So, now we know oxygen's oxidation number is -2.

As you can see, in the compound there are 3 lots of oxygen (O3) so, we will have to times our charge by 3 (-2 x 3 = -6). So overall, the oxygens have a charge of -6.

The charge on the overall compound is -2. Because compounds need a positive and negative to bond, we know S will have a positive charge. This means that we will need to keep 2- from our -6 we have on all our oxygens. So to work out the charge on S, we will basically have this equation:

\[x + -6 = -2\]
What will be needed to make -6 into -2? When you work this out (which is basic maths I'm sure you'll get it), that will be the charge of S.

Answer 38

And for this: What is a redox reaction?

It is easy to remember this: OIL RIG
Oxidation
Is
Loss (of electrons)

Reduction
is
Gain (of electrons)

It's always electrons that are being gained, or lost. Not protons, atoms or mass. So from this information you can figure out your answer.

Sorry for the long explanation, I hope it helps you understand it better for the future :)