Chemistry - January 2007

3.Also How Do You Know When A Solid And A Liquid Form A Solution? 4.And How Can Mixtures Be Separated

2007-01-03 10:55:20 · 5 answers · asked by Jaanie baaby (: 5

i forgot how to convert metrics like from millameters to meters! please teach me how to move the decimal around?

i know that the measurements are mm, cm, dm, m, hm, km

and please don't tell me to use a conversion generator online. i want to learn how to do this by hand. thanks

2007-01-03 10:53:31 · 7 answers · asked by :) 2

2007-01-03 10:46:14 · 6 answers · asked by Anonymous

* Using the relationship between pressure and temperature what would be a concrete example of this relationship

*using the relationship between pressure volume and pressure what would be a concrete example of this relationship

*using the relationship between moles of gas and pressure what would be a concrete example of this relationship


the concrete examples must be everyday examples.

2007-01-03 10:41:54 · 4 answers · asked by Anonymous

2007-01-03 10:23:36 · 3 answers · asked by Anonymous

I'm totally stuck with this problem...
A certain microwave oven delivers 750 watts (joule/s) of power to a coffee cup containing 50 g of water at 25 degrees C. If the wavelength of microwaves in the oven is 9.75cm, how long does it take, and how many photons must be absorbed to make the water boil? The specific heat capacity of water is 4.18J/Cg and assume only the water absobs the energy of the microwaves. Thanks so much!

2007-01-03 10:01:20 · 3 answers · asked by sandcastlesinair 1

2007-01-03 09:58:45 · 4 answers · asked by Modern Major General 7

???

2007-01-03 09:54:22 · 1 answers · asked by NoNome 2

So incase we have problems finding crued oil or cant import any more, can we make our own renewable gas, oil, plastics, ect?

2007-01-03 09:21:49 · 3 answers · asked by Casey 3

2007-01-03 09:11:19 · 3 answers · asked by Stonerscientist 2

At what common temp will both a block of wood & a piece of metal feel neither hot nor cool when you touch them with your hand?

2007-01-03 09:06:00 · 1 answers · asked by kobay 2

2007-01-03 08:59:41 · 6 answers · asked by Anonymous

gold or copper or water or aluminum

2007-01-03 08:57:29 · 1 answers · asked by sjrebel2000 1

2007-01-03 08:53:29 · 16 answers · asked by Anonymous

2007-01-03 08:50:53 · 5 answers · asked by nate 1

Is it something to do with the number of Hydorgen Ions?

Like the more H ions, the more acidic?

2007-01-03 08:03:40 · 5 answers · asked by mark_gg_daniels 4

like malleable, ductile, luster, higher energy, low energy, etc.

2007-01-03 07:40:12 · 6 answers · asked by Anonymous

I don't need to know details about the elements, but know which is the atomic number/mass, and the... make-up of a single box on the table of elements. I can't exactly say what I'm trying to ask.
I am asking about in a box what is what.

2007-01-03 07:32:59 · 4 answers · asked by Lexa 1

If no reaction should occur write no reaction.

Need help please!!

1. Calcium metal was placed in hydrochloric acid.

2. A gold ring was dropped into sulfuic acid.

3. A solutions of copper(II) sulfate was left in a galvanized (zinc-coated) bucket.

4. Copper metal was left in a solution of sodium chloride.

5. Aluminum metal was cleaned with a solution containg hydrochloric acid.

2007-01-03 07:14:36 · 3 answers · asked by jlbtsmith 1

2007-01-03 07:03:30 · 4 answers · asked by Ally 1

2007-01-03 06:44:05 · 2 answers · asked by jeoff m 1

Copper forms 2 different compounds with the chloride ion, CuCl & CuCl2. In writing their names, how do we distinguish between them?

2007-01-03 06:36:31 · 4 answers · asked by San Fran Kid 2

Okay, a friend of mine just told me that farts are flammable! That can't possibly be true is it?

2007-01-03 06:17:19 · 22 answers · asked by Anonymous

I have been going over some homework and have a question:
An empty classroom contains 240kl of air at SATP( 25C, 100kPa).
(a) Calculate the amount of moles of nitrogen, oxygen, argon, and carbon dioxide in the room.
(b)Calculate the mass of each gas.
(c)How will mass of each gas change after class is in it for 1h.
(d)At SATP, respirationg in a classroom converts about about 400L of oxygen per student par school day to carbon dioxide. 30 studetns per period of time and air is stagnant, what % of oxygen is consumed?

You help would be much apreciated,
Stuck person

2007-01-03 06:15:18 · 1 answers · asked by Jazmin 1

Could you please tell me why Ivory soap expands about 2 to 3 times it orginial size when put in the microwave for 2 minutes?

I know that the water molecules are aggrevaited by the heat produced in the microwave, but how does the soap expand?

When the microwave stopped producing heat, the size of the soap starts to decrease. Why is this?

Is it because the air trapped in the soap exscaped?

Please do not list the Stevens guy (or whatever his name is) I already have that information.

2007-01-03 04:55:29 · 3 answers · asked by Barb 1

A titration was started by taking 20ml of 0.01 molar HCL.Then A SOLUTION OF NaOH WAS GRADUALLY ADDED .By mistake the end point was missed and excess NaOH was added.At the end the solution was 0.0001molar in NaOH.What was the pH of the solution at the beginning,at the end point and at the end of titration?

2007-01-03 03:39:35 · 3 answers · asked by flowering_flower1 1

2007-01-03 02:40:13 · 7 answers · asked by Anonymous

2007-01-03 02:21:56 · 6 answers · asked by Joey S 2

This is regarding A level chemistry

2007-01-03 02:19:52 · 5 answers · asked by Fluffy Bum 2

2007-01-03 01:40:03 · 7 answers · asked by preetika r 1