Chemistry - November 2006

I have a quiz tomorrow on molarity and i still don't understand some homework questions.
Please help me solve the following questions.
How many mL of a .5M K2 Cr2 O7 must be evaporated to dryness in order to end up with a 2.948g of solid K2 Cr2 O7.

How many grams of sodium chloride are present in 45mL of .125M NaCl?

How many liters of .5M C6 H12 O6, solution will contain exactly 100g glucose?

What is the molarity of a solution made by dissolving 10.6g of NaCO3 in 400mL of water?

A person mixes 100mL of a .5 M NaOH solution with 150mL of a .3M NaOH solution. What is the molarity of the resulting NaOH solution?

2006-11-16 11:20:05 · 6 answers · asked by > 2

2006-11-16 11:15:15 · 2 answers · asked by Breanna S 1

Like what is the charge of S
And the charge of O
I dont understand how S03 balences

2006-11-16 10:57:22 · 4 answers · asked by airjames023 1

I know it will have four fluorines, but i don't know if it is a central fluorine with three fluorines and a CH3 surrounding it, a carbon with four fluorines, something else?

2006-11-16 10:56:40 · 4 answers · asked by Hopeful Poster 3

What is the balanced equation for the reaction that will occur when slufuric acid is able to dissolve solid copper (II) sulfide?

2006-11-16 10:50:05 · 4 answers · asked by BOK CHOY 1

for ionization energy, which families have the highest values? lowest values? explain.

for electronegativity, which families have the highest values? lowest values? explain.
also, for electronegativity, why does electronegativity generally decrease as you move down a group from periodic table?
and why does electronegativity increase as you go left to right?

2006-11-16 10:49:32 · 2 answers · asked by Anonymous

Explain the difference between a substance and a mixture.

2006-11-16 10:49:25 · 1 answers · asked by merviedz trespassers 3

a professor dropped a mercury filled thermometer. I helped him pick it up and put it in a pyrex beaker. How much contact with mercury is too much? What kinds of effects can mercury have on a person's physiology?
bonus points: do you know why the mad hatter was mad?

2006-11-16 10:45:35 · 2 answers · asked by book_n_dog_lover 2

2006-11-16 10:41:30 · 4 answers · asked by Kayla K 1

2006-11-16 10:37:12 · 2 answers · asked by BOK CHOY 1

What set of hybrid orbitals is used by the central atom in each of the following molecules and ions? (the answers must be in the format of sp3d2 for sp^3d^2)

(a). NH2^-
(b). BrF5
(c)BrF4^-
(d)SO2
(e)O3
(f)NO2^-

NOTE** this is a test review..NOT homework!!

2006-11-16 10:35:31 · 2 answers · asked by lsubetty 2

2006-11-16 10:34:48 · 1 answers · asked by Kayla K 1

Complete the following equation to illustrate the first ionization energy for one mole of magnesuim atoms:

Mg(g)+________kcal- Mg+ (g) + e-

2006-11-16 10:17:36 · 3 answers · asked by Ballerina 1

Complete the following equation to illustrate the first ionization energy for one mole of magnesuim atoms:

Mg(g)+________kcal- Mg+ (g) + e-

2006-11-16 10:09:43 · 1 answers · asked by Ballerina 1

2006-11-16 10:00:19 · 5 answers · asked by unknown 1

the haber process requires nitrogen and hydrogen, what are reasonable sources of both these elements.

2006-11-16 09:53:26 · 4 answers · asked by Anonymous

2006-11-16 09:51:59 · 1 answers · asked by x0x0_karina 1

2006-11-16 09:49:32 · 2 answers · asked by mo 1

2006-11-16 09:43:55 · 2 answers · asked by asianchoc 1

2006-11-16 09:19:23 · 7 answers · asked by Angel Eve 6

2006-11-16 09:09:52 · 5 answers · asked by Anonymous

dont explain to me what is boyle's law. tell me how do we use boyle's law in our everyday life. okay! please and thank u! write the website u got the info from.

2006-11-16 09:07:54 · 2 answers · asked by Anonymous

2006-11-16 08:44:59 · 2 answers · asked by AlmondJoy7 1

Compare by periodic properties!
Thanks

2006-11-16 08:29:52 · 7 answers · asked by Angel Eve 6

Hydrogen can gain one electron to reach a stable electron configuration. Why isn't hydrogen placed in group 7A with the other elements that share this behavior?

2006-11-16 08:24:06 · 7 answers · asked by E 2

the question is elements that have a different number of neutrons and protons are called:

answer please.

2006-11-16 08:15:52 · 6 answers · asked by Anonymous

For chem we're going over something I don't understand that well. Can anyone help? It's how electron movement makes colors of the spectrum? Thanks! ♥

2006-11-16 08:15:43 · 4 answers · asked by nicolemoose91 2

2006-11-16 07:59:37 · 12 answers · asked by STUART C 1

I need help on naming the following compounds:

Copper (III) fluoride
Copper (II) nitride
Cobalt (III) Chloride

Thanks

2006-11-16 07:32:18 · 5 answers · asked by Anonymous

2006-11-16 07:29:46 · 1 answers · asked by beauty mirna 3