Chemistry - March 2007

true or false

2007-03-15 02:50:05 · 1 answers · asked by Anonymous

2007-03-15 02:48:47 · 2 answers · asked by tia 1

2007-03-15 02:39:17 · 2 answers · asked by arvadia.pratik 2

we got and compared it to the percent fat that was on the servings. why would i get a less percent of fat than what the servings say? i used 2 g of chips and then 100 mL of petroleum ether. i got 23.2 percent fat for a total, but the servings label produced 35.7 percent fat. how is this possible? i can't seem to figure it out and it is getting on my nerves.

2007-03-15 02:22:04 · 7 answers · asked by Dan 2

a known mass of

answer options:
iron
air
water
steel

2007-03-15 02:06:02 · 2 answers · asked by Anonymous

answers:

1) heterogeneous reaction
2) reaction rate
3) overall reaction
4) reaction mechanism

2007-03-15 02:04:16 · 2 answers · asked by Anonymous

2007-03-15 02:02:56 · 4 answers · asked by Anonymous

2007-03-15 01:51:42 · 2 answers · asked by Anonymous

Im studying for a test and was wondering these answers...thx....
DEALING WITH ROOTS.

1. explain how root tip moves through soil

2.what is a stele

3.Why are old roots and stems identical in terms of tissues and functions.

4.Why are there no root hairs on old sections of the root

5. Ehy do biologists associate downward material movement with xylem and upward with phloem.

6.Explain how vascular cambium produces more xylem each year and how it contributes to secondary development

2007-03-15 01:44:49 · 2 answers · asked by Anthony V 1

Any one can help me. explain for me how it works; which kind of bond and everything ?
thanks 4 ur helping

2007-03-15 01:35:34 · 3 answers · asked by Nini 1

please tell me how :]

2007-03-15 01:20:36 · 4 answers · asked by kewlbb 2

2007-03-15 01:04:39 · 1 answers · asked by peter O 2

2007-03-15 00:58:25 · 3 answers · asked by DIV 2

I have seen many videos on this. What is the reaction?

2007-03-15 00:40:41 · 2 answers · asked by Omega F 2

pH = pKa + log V/ Ve - V

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

I need a hypothesis for that...care to help? pleaseeeee :]
heres my entire lab.

and CAIS people...dont tell Miss Ho :]

Material
Large beaker
crushed ice
stirring rod
solute
timing device with a second hand measuring device

Procedure
1. Decide exactly how to define "frozen" in this investigation. (This step is important - without it the challenge could be like a marathon without a finishing line.)
2. Plan your procedure. (Hint: Make an ice bath)
3. Obtain your teacher's go-ahead and try out your procedure.

2007-03-14 23:45:03 · 5 answers · asked by kewlbb 2

The choices are:
A. Bromine
B. Nitrogen
C. Sulphur
D. Sodium

2007-03-14 23:14:24 · 5 answers · asked by lurve_forever 1

Just about to go into an exam and I don't know how to do this...
'The solubility of oxandrolene in ethanol is 1g in 57cm^3. Express concentration of this solution as w/v, w/w and molarity
MW oxandrolone is 306.45g/mol
MW ethanol is 46.07
Density of ethanol is 0.810g/cm^3

Cheers!!

2007-03-14 22:33:01 · 1 answers · asked by Anonymous

2007-03-14 22:16:56 · 11 answers · asked by Anonymous

RBD Palm Olein is liquid portion obtained from fractanation of Palm Oil.

2007-03-14 22:14:14 · 1 answers · asked by zhussainu 1

2007-03-14 21:53:30 · 4 answers · asked by Anonymous

I am kind of having trouble with these problems...I get to a certain point then I'm stuck.

1. When 4.21 grams of hydroxide are added to 250 mL of water, the temperature rises by 4.14 °C. Assume that the density and specific heat of the dilute aqueous solutions are the same as those of H2O and calculate the molar heat of solution of potassium hydroxide.

**Would this eq be right?
q=(254.21g)(4.184J/gK)(4.14K)

2.Calculate the standard heat of formation of copper(I) oxide using the following data:
CuO → Cu + ½ O2 ΔH° = 157.3 kJ/mol
4 CuO → 2 Cu2 O + O2 ΔHo = 292.0 kJ/mol

2007-03-14 21:52:54 · 2 answers · asked by Jay 2

The acid is too concentrated to use in a titration.

2007-03-14 21:40:57 · 6 answers · asked by Esperansa 1

anything to do with the extraction of sulphanilamide from Prontosil red dye.

2007-03-14 21:38:53 · 1 answers · asked by Diana G 1

Thanks!

2007-03-14 21:28:59 · 1 answers · asked by aarjop 1

Find the relative atomic mass of nickel if 3.370g nickel was obtained by reduction of 4.286 g of the oxide (NiO).

2007-03-14 21:26:49 · 1 answers · asked by Anonymous

2007-03-14 21:20:30 · 3 answers · asked by xyz p 1

How can i,Distinguish between the , The Saturated Fatty Acid and UnSaturated Fatty Acid. Also about the covalent bonds it will be with the Saturated or with Unsaturated Acids. well am confuse with all Lipid
thanks for your helping

2007-03-14 21:18:14 · 1 answers · asked by Nini 1

2007-03-14 20:56:04 · 8 answers · asked by Anonymous

...for when you put salt in with water and then put copper in the water. A bluish solution forms, what is that called?

2007-03-14 20:55:13 · 1 answers · asked by weirdojhak 1