Chemistry - March 2007

I am going to titrate ethyl ethanoate and sodium hydroxide, i think i have to use Phenolphthalein indicator, what colour change will it go from when i put it in the ethyl ethanoate and to when i neutralise it with sodium hydroxide?

2007-03-12 07:22:42 · 2 answers · asked by jewellui 2

For me it is a flame about three feet tall.

2007-03-12 07:21:10 · 11 answers · asked by Anonymous

how can hardness be measured?

2007-03-12 07:17:25 · 7 answers · asked by Anonymous

As in... " The most important metal Al is made by the electrolytic reduction alumia".

2007-03-12 07:16:43 · 2 answers · asked by Chromium_Erbium 2

copper into silver nitrate

lead into copper nitrate

zinc into lead nitrate

2007-03-12 07:08:30 · 2 answers · asked by leyzeebum 1

How many valence electrons does Silicon have?

2007-03-12 07:06:39 · 7 answers · asked by Anonymous

Write out chemical equations for the reactions between:
a. Propene and Bromine
b.Butene and Hydrogen

Help much appreciated x x x

2007-03-12 07:03:38 · 8 answers · asked by Anonymous

Why formalin is used in fish?
Also tell me what's the effects of it in fish?

2007-03-12 07:03:05 · 1 answers · asked by star123 2

2007-03-12 07:01:24 · 1 answers · asked by Anonymous

Tell me some application of clemmenson reduction and aldol condensation in our daily life?

2007-03-12 06:47:16 · 3 answers · asked by star123 2

2007-03-12 06:45:57 · 5 answers · asked by Ashley 1

2007-03-12 06:41:19 · 6 answers · asked by Alien Anjali 2

....what is the speed of the object at this time??

2007-03-12 06:39:07 · 3 answers · asked by Baby Gurl 1

its for my gnvq science coursework

2007-03-12 06:36:53 · 1 answers · asked by Anonymous

For beakers and boiling tubes and stuff like that?

2007-03-12 06:31:54 · 3 answers · asked by Gottlos 4

1) the molality of an aqueous solution of sodium chloride( NaCl) is 3. 6 m and the density of the same is 1.1g/mL.
a) What is the solute and Solvent in this solution?
b) A 3.6 molality aqueous solution of NaCl contains ______moles of NaCl in ______ of _____.
c) how many grams of NaCl are contained in 3.6moles of NaCl?
d) Take 3.6moles of NaCl and dissolve them in 1000g of water. what is the total weight of this solution?
e) calculate the weight percentage of NaCl in this solution.
f) How many moles of water do you have in 1000g of this solvet?
g) Calculate the molar fraction of sodium chloride in a 3.6 molality aqueous solution of the salt.
h) the density of the solution is 1.2g/mL, what is the total volume of the solution . total weight of solution =
i) solve the molar concentration of NaCl in the solution that you prepared above.
j) ^T=iKcm, calculate the change in the freezing point and the boiling point of a 3.6 molality aqueous solution of NaCl (Kb:0.51degre,Kf1.86

2007-03-12 06:28:20 · 1 answers · asked by Lilac 2

a) NH3 : A Bronsted base, but not a Lewis base

b) OH - : A Bronsted base and a Lewis base

c) CH3CH2CH2COOH : A Lewis acid, but not a Bronsted acid

d) Fe 3+(aq) : A Lewis acid, but not a Bronsted acid

e) C6H6 : Both a Bronsted acid and a Lewis acid

2007-03-12 06:09:19 · 4 answers · asked by Joe 1

Oxygen and Sulfur dioxide react at high pressure and temperature to produce sulfur trioxide as shown in the following chemical equation : SO2(g) + O2 yield SO3
a) Write the balanced equation for this equation
b) The formula weight of the molecule of O2 is ________uma
c) How many moles of O2 do you have in 69.4g of this gas?
d) Assume a sample of 69.4g of O2 gas is contained in a 13.6L vessel at 200degrees. What is the pressure of the O2 in the vessel?
e) Assume that you want to convert all the oxygen in the vessel mentioned above into SO3, how many moles of SO2 would react with all the oxygen in the vessel.
f) Calculate the molar fraction of each gas in the mixture. total number of moles, molar fraction of O2, Molar fraction of SO2.
g) What is the total pressure of the gas mixture in the vessel?
h) How many moles of SO3 would be produced assuming 100% yield for the reaction of O2 and SO2.
g) What is the final pressure SO3 in the vesselassuming100% yield for the reaction.

2007-03-12 06:02:14 · 1 answers · asked by Lilac 2

2007-03-12 05:56:28 · 1 answers · asked by Anonymous

2007-03-12 05:54:26 · 2 answers · asked by aditi n 1

i need the answer in kJ with significant numbers

2007-03-12 05:53:48 · 3 answers · asked by Anonymous

physical science

2007-03-12 05:42:26 · 1 answers · asked by Baby Gurl 1

Zn|Zn2+(1.00M)||K3Fe(CN)6(0.10M), K4Fe(CN)6 (0.10M)|Pt

2007-03-12 05:42:21 · 2 answers · asked by Anonymous

(and im not talking about potassium!):)

2007-03-12 05:38:49 · 9 answers · asked by Tracey Lee ♥ 2

What determines the strength of the bonds between atoms/molecules (and so determines the state of matter at a certain temperature)?

Wikipedia is very terse and technical on the matter.

2007-03-12 05:29:59 · 4 answers · asked by Andrew H 2

if you mix 20.0 mL of a 3.00 M sugar soltuion with 30.0mL of a 5.00 M sugar solution you will end up with a sugar solution of what?

2007-03-12 05:25:30 · 4 answers · asked by ashesanne 2

2007-03-12 05:21:10 · 1 answers · asked by i-sena 1

2007-03-12 05:16:59 · 1 answers · asked by i-sena 1

a solution of ions forms preticipates after mixing with a solution of NaOH , adding an extra volume of NaOH redissolves the preticipate , why is this happening ?

2007-03-12 05:15:06 · 3 answers · asked by livefast_dieyoung 2

so i have solution A:

3.00L of 3.00M of NaCl

and solution B:

2.00L of 2.00 M of AgNO3

if i mix these two solutions together, how do i calculate the concentrations (in M) of the following ions in solutions C.

Cl minus?

2007-03-12 05:13:40 · 4 answers · asked by ashesanne 2