Question

can someone help me review for my final?

Answer 1

Do you want us to provide you with questions or do you have a specific topic in mind?

Answer 2

i'm just really confused on chemical equations...i don't understand them at all!

Answer 3

For example: \(\sf \color{blue}{Pb(NO_3) _2~_{(aq)} + 2KI_{(aq)} --> PbI_2~_{(s)} + 2KNO_3~_{(aq)} }\)

Answer 4

What exactly are you confused on? Balancing? Interpreting the information? Reaction process? Products?

Answer 5

balancing and how to name products.

Answer 6

Well, there are special rules for naming. But, let me give you a problem as an example to help you with balancing. It's quite intuitive when you get the hang of it.

Answer 7

ok thank you by the way

Answer 8

For example, say that I give you: \(\sf \color{red}{Fe+Cl_2 \rightarrow FeCl_3}\)

Answer 9

A fairly simple equation. You have Iron reacting with Chlorine to form Iron (III) chloride. now, to make this easy for YOU and also neater (avoid making mistakes), make a table of what you have on both sides: reactant and product side

Answer 10

so it's iron chloride (3)?

Answer 11

To balance, that means that BOTH sides must have the SAME number of atoms. Why? Because atoms don't just disappear. In a chemical reaction, they all go somewhere! Which is why you need to balance it! A chemist must know where it went.

Answer 12

notice how it's NOT the same for chlorine on both sides. Therefore, let's balance:

If you remember from algebra, \(distributive~property\), when you have: 3(A+B) = 3A+3B...it's the same If you add a 2 in front of FeCl\(_3\), that means you have 3 Fe and \(\sf \color{red}{6}\) Chlorines!

Answer 13

oh! that makes so much more sense! i was so confused because my teacher explained it weird but i think i got the hang of it!

Answer 14

Also, note, that what you do to one side, you must do to the other!
So, you have: Fe + Cl\(_2\) \(\rightarrow\) \(\sf \color{red}{2}\)FeCl\(_3\)
Now, look at the left, side. Add a 3 to chlorine and 2 to Iron! To get: \(\sf \color{blue}{2}\)Fe + \(\sf \color{limegreen}{3}\)Cl\(_2\) \(\rightarrow\) \(\sf \color{red}{2}\)FeCl\(_3\)

Answer 15

Balanced.