ada free sample q's

[queenskillers]

During a tikition it was determined that 30.00
mL of a 0.100 M Ce4+ solution was required to
react completely with 20.00 mL of a 0.150 M
Fe2+ solution. Which one of the following reactions
occurred?

Answer: Ce4+ + Fe2+ --> Fe3+ + Ce3+

How would a Lewis structure for the NO3 - ion have 3 resonance structures? Once you start moving the double bonds to the other O's, isnt it same structure? Shouldnt the answer be only one resonance structure?

---

Members don't see this ad.

 

[queenskillers]

also how are alkaline earth metals different from regular alkaline metals (Q68 in Achiever 3 Science test). thanks for the help.

 

[D.D.S.]

also how are alkaline earth metals different from regular alkaline metals (Q68 in Achiever 3 Science test). thanks for the help.

one thing is that they have differnt oxidation numbers.
Alkaline earth metals are group 2
Alkaline metals are group 1
different number of valence electrons

know this stuff...

 

[HeatingHomer]

During a tikition it was determined that 30.00
mL of a 0.100 M Ce4+ solution was required to
react completely with 20.00 mL of a 0.150 M
Fe2+ solution. Which one of the following reactions
occurred?

Answer: Ce4+ + Fe2+ --> Fe3+ + Ce3+

If you do the math, it comes out that .003 moles of each were used giving you a 1:1 ratio.

 

[tRNA]

how many free practice tests does ada provide?

 

[pbure]

If you do the math, it comes out that .003 moles of each were used giving you a 1:1 ratio.

how do u get 0.003 moles?

 

[D.D.S.]

how do u get 0.003 moles?

Molarity = moles/liters

so they give you 30 ml = .03 L
to get moles, you multiply .03 L to the Molarity (.1) which cancels out the Liters, and leaves you with moles. Same thing is done with the 20 ml and .15 M.