Chemistry - November 2006

state the boyle's law.

2006-11-16 01:24:54 · 4 answers · asked by haler 1

I just want to know what is the use of those laboratory apparatuses

2006-11-16 01:12:40 · 2 answers · asked by Hershey 1

2006-11-16 01:05:04 · 5 answers · asked by Joe D 1

2006-11-16 00:46:16 · 4 answers · asked by bhargavi 2

2006-11-15 22:48:39 · 2 answers · asked by Russell R 1

True or False

Every question needs an answer of true or false

You cannot see through opaque materials because they absorb or reflect all light

Sunscreens protect us from ultraviolet rays by reflecting the photons of the ultraviolet wavelengthes

Cyan is a pigment that reflects blue light and absorbs all other colors

Sound waves can be diffracred, but light waves cannot

Lenses are designed to reflect light rays.

Additional Details

2006-11-15 22:25:11 · 8 answers · asked by cetinnovations 1

QC,R&D chemical labs

2006-11-15 21:49:17 · 8 answers · asked by Anonymous

quantitative determination of cyanide in cassava root tubers and leaves.
procedure and method for determining cyanide.

2006-11-15 19:33:40 · 4 answers · asked by Anonymous

2006-11-15 18:22:27 · 5 answers · asked by MiG 1

2006-11-15 18:04:59 · 1 answers · asked by mahendragirase66 1

please tell me all the reasons, thanks <3

2006-11-15 18:03:11 · 3 answers · asked by DONUT 1

I need to find the specific heat of a metal but to do that I have to use the mass of water. I'm only given that there is 50.0 mL of water. what is the formula to find the mass of 50.0mL of H20?

thanks!
-SelArom

2006-11-15 17:27:58 · 7 answers · asked by SelArom 1

How do you calculate if the Enthalpy of formation is 1.895?

2006-11-15 17:22:32 · 2 answers · asked by mangodroplet 2

What are the main ingrediants that make an apple turn brown when exposed to oxygen? I am doing a science project that requires this information, so if you have anything to me, please
e-mail me. It could help me a lot.

Thanx
Bernie

2006-11-15 16:27:13 · 3 answers · asked by travalincanadiangirl 1

2006-11-15 16:05:21 · 2 answers · asked by Anonymous

2006-11-15 15:26:35 · 5 answers · asked by good advice 3

How would I go about calculating the volume occupied by 5.8 g of propane gas (C3H8) at 23 degrees Celsius and 1.15 atm pressure?

do I use PV=nRT (V=nRT/P)? I'm not sure how to get n though...I know it's number of moles...so is it just 5.8 g/44 g (molecular weight of C3H8)?

2006-11-15 14:54:11 · 3 answers · asked by Anonymous

2006-11-15 14:49:30 · 5 answers · asked by ♥heartbroken♥ 3

Think in chemistry terms.

2006-11-15 14:48:22 · 2 answers · asked by nc123135 1

How did he influence chemistry? I'm not looking for a bio on him, just..... what did he do to influence chem?

2006-11-15 14:38:54 · 1 answers · asked by sillygoose08 3

calculate the frequency of a radiation with a wavelength 455nm.

arg i know how to do it, its the units that throw me off.
please help!

2006-11-15 14:22:07 · 3 answers · asked by Stephanie 3

What subscripts would most likely be used if the following substances formed an ionic compound?

1. An alkali metal and a halogen
2. An alkali metal and a nonmetal from group 6a
3. An alkaline earthmetal and a halogen
4. An alkaline earthmetal and a nonmetal from group 6a
5. a metal from group 3a and a halogen

2006-11-15 14:12:50 · 1 answers · asked by User84 4

The initials are pdB. It is a chemical used usually in a hospital or anywhere else to keep away bugs. The melting point is 53 degrees celsius. When I did the experiment, I got the freezing point to be 23 degrees Celsius.

2006-11-15 14:07:20 · 3 answers · asked by nc123135 1

AgCl(s) -- Ag (aq)+ Cl (aq)
Ksp = 1.7x10*-10

2006-11-15 13:16:38 · 2 answers · asked by diana t 1

This a problem of solubility
You need to produce a buffer solution that is = 5.37 . You already have a solution that contains 10 millimoles of acetic acid. How many of solid sodium acetate will you need to add to this solution? The of acetic acid is 4.74

2006-11-15 12:51:52 · 1 answers · asked by diana t 1

a chemist needs to order Na2B4O7.one supplier offers it in an anyhydrous ( without water ) form, while another offers it as a hydrated crystal ,Na2B4O7.10H2O.if the prices from the two supplier are the same for a 500 g bottle ,which one would supply more of desired Na2B4O7 ? explain your answer .

2006-11-15 12:40:08 · 2 answers · asked by henry f 2

copper (ll) sulfate is a hydrated crystal with the formula CuSO4. 5H2O and a deep blue color . when it is heated the crystals crumble and turn white .
a ,propose an explanation for this change of color
b, what would you do to restore the blue color .

2006-11-15 12:31:04 · 2 answers · asked by henry f 2

2006-11-15 12:28:54 · 2 answers · asked by LaLo 713 1

a crystalline material containing 30 g of barium chloride crystals was placed into an oven at 400 centigrade and heated for two ours. it was then cooled and weighted . the new mass was less before it was heated ,contain 20 g of barium chloride . how is this possible ?

2006-11-15 12:25:33 · 2 answers · asked by henry f 2

2006-11-15 12:20:37 · 2 answers · asked by amy B 1