Chemistry - June 2007

I need the info for my project. thx if u can help mi answer de qn!!=)

2007-06-05 01:32:37 · 3 answers · asked by Anonymous

(i) Shape of the test jar
(ii) Volume of the test jar
(iii) Prior heating of sample before test
(iv) Quantity of the oil used
(v) Rate of cooling


i couldn't find the ans on the net.. =(

2007-06-05 01:21:05 · 1 answers · asked by lghri 1

what kind of molecular bonds or chemical reaction does citric acid goes through with the grime?


I know that citric acid is a polyprotic weak organic acid.
I have been searching everywhere for answers but even wiki doesn't show it.

2007-06-04 21:19:41 · 2 answers · asked by Anonymous

2007-06-04 20:32:40 · 4 answers · asked by Lakshya A 1

The piezoelectric effect is ultimately a consequence of the crystalline solid obeying the __________________.

Using piezoelectric effect, explain how flint rock can be used to start a fire.

2007-06-04 18:24:54 · 1 answers · asked by mac 1

36. The piezoelectric effect is ultimately a consequence of the crystalline solid obeying the __________________.

37. Use what you have learned about the piezoelectric effect to explain how flint rock can be used to start a fire.

2007-06-04 18:12:18 · 1 answers · asked by mac 1

(1) Fry the potateos in a wok.
(2) Boil the potatoes in a pan
(3) steam the potatoes in a steamer
(4) Boil the potatoes in a pressure cooker

2007-06-04 17:29:06 · 16 answers · asked by Anonymous

I need to soak a pH meter in something of pH of 4.

2007-06-04 17:25:31 · 10 answers · asked by Allen H 1

Fish flesh (10g) was extracted with trichloroacetic acid (10%, 10mL). The extract was filtered and diluted to 50mL. An aliquot (10mL) was placed in a Markham still together with sodium hydroxide solution (40%, 10mL) and steam distilled into boric acid (5mL) and methyl red/methylene blue indicator (3 drops)

At the completion of distillation, the boric acid solution was titrated with hydrochloric acid (0.01N). A titration of 8.75mL of acid was required to reach the end point and a blank titration of 0.25mL was obtained.

Calculate the level of total volatile bases present in the fish flesh as mg N/100g flesh.

the total volatile bases mean nitrogen content and HVL 0.01N = 0.01mol/L

2007-06-04 17:25:29 · 2 answers · asked by Anonymous

2007-06-04 17:20:13 · 7 answers · asked by Anonymous

2007-06-04 17:11:15 · 2 answers · asked by Anonymous

2007-06-04 16:19:39 · 5 answers · asked by lostinlalaland 2

I was watching a film with a diving sequence, while the person was exploring an old shipwreck, I noticed they carried in their hand for lighting what looked like a burning torch with a flame.

What could this have been?

2007-06-04 15:14:19 · 5 answers · asked by Dee 2

2007-06-04 15:08:14 · 3 answers · asked by Anonymous

a) 2,3-dichlorobutane
b) 2,3-dichloro-2-butene
c) 1,3-dimethylbenzene
d)4,4-dimethyl-2-pentyne

2007-06-04 14:50:07 · 4 answers · asked by pamoberst 2

2007-06-04 14:26:27 · 1 answers · asked by 2Quinn 2

2007-06-04 14:08:59 · 1 answers · asked by daveyboii 2

This says to write a balanced equation for the complete combustion of each compound. such as:
butene (C4H8)
octane (C8H18)
I was wondering if someone can tell me how to do the first one and I could try the second one. Thanks!

2007-06-04 14:08:10 · 2 answers · asked by Anonymous

how can you determine the diameter of an atom. I looked it up and it said the average diameter is 10^-8 but how did they get that number?

2007-06-04 14:07:31 · 3 answers · asked by Lynn M 1

so look there is that kind of water bomb when you fill it witl toilet cleaner anf then drop balls of foil in there it explods after 30 seconds, so have aproblem nothing is happening to the bottle
it wont start to fill with gas
i hear people saying that only the works cleaner will work
but on mine it says hydrochloric acid.i believe thats right thing
here is the video where they do it

2007-06-04 13:50:05 · 2 answers · asked by Anonymous

2007-06-04 13:48:09 · 3 answers · asked by Anonymous

Ba(NO3)^2 is added to a solution of 0.025M of NaF.
-- At what conc. of Ba^2+ does a precipitate start to form?

Here's the start of my work

BaF2 --> Ba^2+ + 2F-

Ksp = [Ba^2+] [F-]^2

what should my next step be?

2007-06-04 13:34:43 · 2 answers · asked by Anonymous

Would volume increase, decrease, or remain the same if a gas was compressed in a cylinder?

2007-06-04 13:32:19 · 7 answers · asked by Vic 1

Calculated how many grams of methane (CH4) are in a sealed 80 mL flask at room temperature (22ºC) and 780 mm Hg of pressure

2007-06-04 13:18:14 · 2 answers · asked by Maddie L 1

A gas is compressed in a cylinder. The number of gas molecules would increase, decrease, or remain the same?

2007-06-04 13:10:07 · 4 answers · asked by Maddie L 1

2007-06-04 12:48:00 · 1 answers · asked by Anonymous

2007-06-04 12:46:12 · 1 answers · asked by Anonymous

using butene as an example, distinguish between structural and geometrical isomers

2007-06-04 12:36:31 · 3 answers · asked by pamoberst 2

Calculate the change in internal energy of the system and determine whether the process is exothermic or endothermic...
a) a 50-g sample of water is cooled from 30C to 15C thereby losing approximately 3140 J of heat.
b) A chemical reaction releases 8.65 kJ of heat and does no work on the surroundings.

2007-06-04 12:25:16 · 1 answers · asked by Anonymous

can you guys tell me how to conduct this experiment without using a bomb calorimeter

2007-06-04 11:47:20 · 1 answers · asked by ShadowHawk 2