Chemistry - March 2007

Remember, to enter an answer in exponential notation use e, example: 1.47e-8

2007-03-22 16:04:35 · 1 answers · asked by Mike P 1

Which of the following are true statements about CO2 ?



a) The melting point of CO2 increases as pressure decreases


b) The critical point of CO2 occurs at 31oC and 73 atm


c) At −20oC and 12 atm CO2 is in the liquid state


d) At 20oC and 1 atm, solid CO2 will melt to liquid state


e) Above 31oC and 31 atm CO2 can not be compressed to the liquid state
under any amount of pressure

2007-03-22 16:03:48 · 1 answers · asked by tobeever 1

2007-03-22 16:03:48 · 1 answers · asked by hqt5009 2

for the weak base pyridine (C5H5N) with water.

2007-03-22 15:50:35 · 2 answers · asked by pa0250 1

2007-03-22 15:49:18 · 2 answers · asked by laura 1

2. For each of the following chemical equations, write all possible mole ratios:
a. 2Ca+O2---->2CaO
b.Mg+ 2HF ----> MgF2+H2

2007-03-22 15:46:53 · 2 answers · asked by whisp3r G 1

2007-03-22 15:44:52 · 2 answers · asked by laura 1

Chemistry

2007-03-22 15:34:29 · 5 answers · asked by orlandob333 2

5. How many moles of molecules of aspirin C9H8O4, are there in a 100.0 mg tablet of aspirin?

6. Calculate the percentage composition of (NH4)2CO3

2007-03-22 15:33:10 · 4 answers · asked by SiR SmoKe a LoT 1

1. Determine both the formula mass of ammonium carbonate, (NH4)2CO3

2.How many moles of atoms of each element are there in one mole of (NH4)2CO3

3. What is the mass in grams of 3.25 mol Fe2(SO4)3?

2007-03-22 15:30:19 · 3 answers · asked by SiR SmoKe a LoT 1

Can someone please explain to me why is it when you add sodium chloride to water, more ins are created, and can please explain in detail.....THANKS :)

2007-03-22 15:26:15 · 3 answers · asked by Anonymous

calculate the freezing point in degrees C of a 0.100 molality (not molarity) aqueous solution of a weak electrolyte that is 7.5% dissociated.

please, i dont want the answer, i don't know how to start the problem with the percentage and molality.
thanks

2007-03-22 15:25:00 · 1 answers · asked by Anonymous

Write teh chmical reaction for the dissociation of boric acid in water losing only one proton only

Write the chemical equation for the reaction of pyridine and water.

Write thechemical equation for dissociation of formic acid in water.
I don't know how to write the chemical equations for these three problems. If anyone can do it, it would help out a lot. thanks

2007-03-22 15:24:53 · 1 answers · asked by silentcargo 3

4. Write formulas for each of the following compounds:
a.barium sulfide
b.sodium hydroxide
c. lead (II) nitrate
d. potassium permanganate
e. iron (II) sulfate
f. diphosphorus trioxide
g. disulfur dichloride
h. carbon diselenide
i. aceitc acid
j. chloric acid
k. sulfurous acid
l. phosphoric acid




thank you :)

2007-03-22 15:22:44 · 1 answers · asked by SiR SmoKe a LoT 1

Dilute HCL(aq) and KOH(aq) are mixed in chemically equivalent quantities. Write the following

a.formula eqtn. for the reaction
b. overall ionic equation
c.net ionic equation

Another question

Write formula equation and net ionic equation for
Al(s) + H2SO4(aq) --->


Last one
A seashell that is composed largely of calcium carbonate reacts with a solution of HCL. As a result, 1500 ml of dry CO2 gas at STP is produced. The other products are CaCl2 and H20.

a. How many grams of CaCO3 are consumed in the reaction
b. What volume of 2.00 M HCl solution is used in this raeaction?

2007-03-22 15:18:18 · 1 answers · asked by Intuition 3

What do acetic acid and hexanol form?

2007-03-22 15:16:59 · 2 answers · asked by Sgt. Pepper 2

2Al(s) + 3CuSO4(?) ---> Al2(SO4)3(?) + 3CU(s)

What are the state of matters for the one with the question mark/ Thanks!

2007-03-22 15:16:50 · 1 answers · asked by Jessica 1

We have a unit that collects the absorbance of samples in a cuvette and displays it on a laptop connected via USB:

Would changing the width of the cuvette alter the absorbance? If so, how?

Would changing the height of the cuvette alter the absorbance? If so, how?

2007-03-22 15:14:16 · 7 answers · asked by Anonymous

For the reaction


LiOH + CO2 → Li2CO3 + H2O


how many grams of Li2CO3 are produced from the complete reaction of 95.80 g of LiOH ?

Enter a numeric answer only, no units.

Yes, Computer gets: 147.78

The problem before.

2007-03-22 15:13:57 · 1 answers · asked by BklynNate 1

An aqueous solution freezes at -2.47 degrees C. What is its boiling point?

I need help with this question, i feel like it's missing information..?

2007-03-22 15:06:51 · 4 answers · asked by Anonymous

a) synthesis
b) decomposition
c) single replacement
d) double replacement.

2007-03-22 15:06:19 · 3 answers · asked by classy.chic 3

14. Name each of the following acids:
a.HF
b. HBr
c.HNO3
d. H2SO4
e.H3PO4


(the numbers are small and under the letters in the textbook, just in case u get confused)

2007-03-22 15:04:10 · 1 answers · asked by Whisper G 1

2007-03-22 14:54:37 · 3 answers · asked by Anonymous

Can you guys explain to me?

2007-03-22 14:52:34 · 1 answers · asked by .·´¯`·-> вавіі-ѕнаz <-·´¯` 2

1) sulfur trioxide -
2) phosphorus pentachloride
3) calcium flouride
4) lithium oxide

(: thanx.
and also. wats ionic and covalent ? what's the difference?

2007-03-22 14:40:51 · 2 answers · asked by classy.chic 3

a. P1CI3
b. P3CI3
c. PCI3
d. Si2O



thankkk cheww

2007-03-22 14:29:26 · 3 answers · asked by Anonymous

A.) 101.0 mL of a solution of quinine contains 202.0 x 10-3 mol of quinine.
If this is titrated with 0.200 M HCl, what is the pH half-way to the stoichiometric point ?

Quinine is monobasic with Kb = 7.90 x 10-6

B.) What is the pH at the stoichiometric point ?

2007-03-22 14:28:10 · 1 answers · asked by geebgeebgeeb 1

2007-03-22 13:56:09 · 3 answers · asked by VegasDiamond 1

gimme the balanced chemical equation.....

2007-03-22 13:55:09 · 2 answers · asked by shaggy 1

reactions that run to completion :


product gas ( nn reversible reaction)
product is unioized like water ( non reversible reaction
percipitation is fromed ( non reversbile reaction )

2007-03-22 13:51:55 · 2 answers · asked by what ever ? 2