Chemistry - October 2006

2006-10-03 14:43:09 · 2 answers · asked by Alicia3280 1

If a minimum of 423.6 kJ/mol is required to remove electrons from C atoms on a surface of a sample of carbon, what is the maximum wavelength (max) of light that can remove an electron from a C atom on this surface?

If the same carbon surface is irradiated with light of =175.7 nm, what is the maximum kinetic energy that a released electron could have?

2006-10-03 14:42:25 · 1 answers · asked by Anonymous

I need to know this for chem lab. Thank You all

2006-10-03 14:25:37 · 3 answers · asked by HeTrP 1

I really need to know! I am teaching an Honors Chemsitry class tomorrow :)

2006-10-03 14:20:59 · 7 answers · asked by Chelsea Nicole 1

In a constant pressure calorimeter, 199 mL of a 1.00 M alkaline earth metal (Me) chloride solution were added to 199 mL of a 1.00 M potassium sulphate solution. The total heat capacity of the calorimeter including all the contents was 1.75 kJ oC-1. The temperature in the calorimeter rose from 24.50oC to 28.42 oC.
Paying particular attention to sign and significant figures,
calculate the enthalpy change, in kJ, for the reaction:
Me2+ (aq) + SO42- (aq) = MeSO4 (s).
Me is the alkaline earth metal in question.
If you wish to use scientific notation, use the "e" format - eg. 7.31e4 = 73100 & 1.90e-2 = 0.0190.

2006-10-03 14:04:18 · 1 answers · asked by Anonymous

2006-10-03 13:59:17 · 0 answers · asked by Juan V 1

4) to two decimal places, what is the relative atomic mass and the molar mass of the element potassium, K?

2006-10-03 13:46:13 · 2 answers · asked by Lion 1

2) Describe one conclusionmade by each of the following scientists that led to the development of the current atomic theory:
a. Thomson b. Millikan c. Rutherford

2006-10-03 13:38:32 · 1 answers · asked by Lion 1

1) Define each of the following:
a. atom b. electron c. nucleus d. proton e. neutron

2006-10-03 13:34:34 · 1 answers · asked by Lion 1

In the titration of sea water, how can i find the conc. of carbonate.
11.97 ml of 0.00970 M sulfuric acid was added.
100 mL of sea water was used to titrate.

2006-10-03 13:31:54 · 1 answers · asked by curiousgeorge 1

Why is the emitted light in a flame test for sodium (yellow), while the light emitted for strontium is bright red-orange?

2006-10-03 13:26:59 · 2 answers · asked by Anonymous

here is the rubic for the project due tomorrow:
Chemistry in the News
Project

Chemistry is involved in your everyday life from the digestion of your breakfast to fueling your car. Over the next week, you are to research, collect, and summarize articles from magazines, newspapers, or the Internet illustrating how Chemistry touches your everyday life. You should find local examples for your community, such as water quality, food safety, hazardous waste, etc, as well as examples that pertain to Louisiana and its large chemical and petrochemical industries. You should cite examples where scientific advances in chemistry have affected society. This is an INDIVIDUAL assignment. You will be graded on the following items: You have 5 articles, they are related to chemistry, you have an original/copy of the article, you summarized the article sufficiently, and you wrote a paragraph on how the article relates to chemistry, there is a work cited pages with all of the article listed.

2006-10-03 13:25:34 · 3 answers · asked by Anonymous

I presently use cocamide DEA in my dishwashing liquid I wish to revise this formula and use cocamidpropyl betaine instead.

2006-10-03 13:16:43 · 1 answers · asked by tracey 1

The Mass in Grams of 9.64x10^24 molecules of diclorine heptaoxide. (How do you put this in molucule formula, ex. CuSO4)

2006-10-03 13:10:33 · 4 answers · asked by ==== 3

11.15g of pure iron are allowed to react with oxygen fo form an oxide, Fe(x)O(y). If the product weighs 14.3g, find the simplest formula of the compound.

2006-10-03 12:44:27 · 2 answers · asked by Anonymous

2006-10-03 12:31:50 · 6 answers · asked by Anonymous

2006-10-03 12:31:17 · 14 answers · asked by Anonymous

2006-10-03 12:25:35 · 8 answers · asked by Anonymous

2006-10-03 12:24:23 · 7 answers · asked by Anonymous

2006-10-03 12:23:45 · 9 answers · asked by Anonymous

I need a slogan for Beryllium. IM doind a project and i need a slogan. this project is trying to sell it. it being the element Beryllium.

2006-10-03 12:04:58 · 3 answers · asked by vipr259 2

2006-10-03 12:04:08 · 7 answers · asked by desire_4_life_4_shoo 1

2006-10-03 11:55:23 · 3 answers · asked by Anonymous

i'm trying to see what wood would soke up the least amount of water for a project

2006-10-03 11:31:15 · 2 answers · asked by Anonymous

I'm looking for a somthing that I can add to a tub of water to increase its viscosity. Perhaps some sort of gelatin powder? The consistency of a heavy oil or a light honey is what I'm looking for.

Any ideas?

2006-10-03 11:17:38 · 18 answers · asked by Anonymous

I have some question on heating treatment for a metallic item.

For example, if I have two paper clip, where 1 is being HEATED TO GLOWING RED THEN COOLED OFF QUICKLY IN COLD WATER would it be hard and brittle...there if another paper clip is being HEATED TO GLOWING AND LEFT ASIDE TO BE COOLED OFF SLOWLY would it be more flexible

please answer and provide some explanation if possible

2006-10-03 11:14:56 · 1 answers · asked by Anonymous

How would i figure what the max molar yiled of H2 is when 1.46 g Mg is added to 500 mL of 0.2M CuSO4?
the equation is
2Mg+2CuSO4+H2O--->2MgSO4+Cu2O+H2

i got 0.1M but im not sure if this is correct??
and what is the limiting reactant? i got the Mg to be it, is that right?
THANKSSSSS!!!! :)
10 points are yours if you can explainit the best! :)

2006-10-03 11:10:12 · 3 answers · asked by Anonymous

2006-10-03 11:03:33 · 3 answers · asked by Anonymous

2006-10-03 11:01:11 · 1 answers · asked by Anonymous

Density in water is determine based on the amount of salt added in the water. What's the relevance of density of liquids to our daily lives?

2006-10-03 10:51:39 · 3 answers · asked by Oscar A 1