Chemistry - January 2007

2007-01-17 14:16:19 · 2 answers · asked by Joshster 1

2007-01-17 14:15:34 · 7 answers · asked by col_bs 1

what volume of 2M HCI is required to prepare 500mL of 0.1 HCI?

Please show your work. I am still trying to figure out how to do this type of problem. =)

2007-01-17 14:11:27 · 1 answers · asked by Anonymous

2007-01-17 13:58:41 · 1 answers · asked by Tunoa H 1

2007-01-17 13:56:57 · 1 answers · asked by Frankly 2

2007-01-17 13:52:34 · 1 answers · asked by Laney K 1

I am a 5th Grader and This is my science project, so try to explain so I can understand. And could you also tell me how to setup my project?Tell me how to decorate it and stuff, other expirements with Mentos and Soda. I want to win this year. Thanks for the help!

2007-01-17 13:49:28 · 7 answers · asked by R3d EYe5 DaRKn35S DraG0N Ma5T3R 3

a total of 23.8 mL of 0.104 M NaOH is used to reach the stoichiometric point in titrating 120.0 ml of a sulfuric acid solution with an unknown concentration. Calculate the molarity of the H2SO4 solution. Write a balanced equation. remember that sulfuric acid is a diprotic acid.

2007-01-17 13:36:25 · 3 answers · asked by help ^_^ 1

I can't figure it out! Carbon and Silicon, just that, and only that. what is the name of the compound? where can I normally find it?

2007-01-17 13:31:30 · 2 answers · asked by Russly F 3

a 42.6 gram lead fishing weight is removed from a boiling water bath and allowed to cool to room temp (25.0 C) calculate the heat involved in kilojoules. (waters specific heat capacity is 4.184 j/gC)

2007-01-17 13:28:47 · 3 answers · asked by agntheather 1

one penny =2.5 grams, the earth = 5.98x10to the 27th
and 1 mole = 6.022x 10 to the 23rd

2007-01-17 13:25:06 · 2 answers · asked by FireFly 1

are radioactive drugs only used for diagnostic purposes only or can they also be used to test blood + tissue?

2007-01-17 13:24:13 · 2 answers · asked by asdf123 1

2007-01-17 13:18:01 · 4 answers · asked by Alexis 1

2007-01-17 13:16:13 · 2 answers · asked by Anonymous

1. Where are many radioactive nuclides presently made?
Oak Ridge, Atlanta, Savanna or Nashiville?

2. Radioactive carbonis naturally produced in the atmosphere by teh actioin of?

3. Radioactive materials whose movement is used to monitor processes and measure flow rates are called?

2007-01-17 13:11:24 · 1 answers · asked by asdf123 1

If I was given 10 mL and 2 M of acetic acid and 2.50 g of sodium bicarbonate what is my balanced equation what is my limiting reagent and theoretical yield.

2007-01-17 13:02:54 · 2 answers · asked by Anonymous

In 0.652 M (NH4)2SO4, the concentration of the cation is _____ M and the concentration of the anion is _____ M.

2007-01-17 13:02:34 · 1 answers · asked by Anonymous

In 0.314 M Cr2(SO4)3, the concentration of the cation is _____ M and the concentration of the anion is _____ M.

2007-01-17 13:01:57 · 2 answers · asked by Anonymous

In a solution of NiCl2, the Cl concentration is 0.08684 M. How many grams of NiCl2 are in 338 mL of this solution?

2007-01-17 12:58:13 · 2 answers · asked by Anonymous

2007-01-17 12:56:04 · 4 answers · asked by Anonymous

Formic acid, HCOOH, is responsible for the painful bites of fire ants. Is formic acid a strong or weak acid? Explain.

2007-01-17 12:43:31 · 2 answers · asked by untilyoucamealong04 3

Could you tell me HOW and what the answers are for these? I want to know how because there are other problems like it.

A) the type of reaction that occurs
B) predict the products of the reaction
C) write a balanced chemical equation

aluminum metal + calcium phosphate ->

2007-01-17 12:29:42 · 2 answers · asked by Country Boy 3

A mass of ).497-g sulfamic acid, NH2SO3H, dissolved in 50.0 mL of water is neutralized by 28.4 mL of NaOH at the phenolphthalein endpoint. WHat is the molarity of the NaOH solution? the Formula weight of NH2SO3H is 97.1 g/mol: NH2SO3H + NaOH----->NH2SO3 -NA+ + H20

2007-01-17 12:25:22 · 3 answers · asked by help ^_^ 1

A 0.981-gram sample of potassium hydrogen phthalate, KHC8H4O4, is dissolved in 100 mL of water. If 18.9 mL NaOH are required to reach the stoichiometric point, what is the molarity of the sodium hydroxide? the formula weight of KHC8H4O4 is 204.2 g/mol

2007-01-17 12:22:06 · 3 answers · asked by help ^_^ 1

done a lab,mix zinc w/acid, got hydrogen then i put the hydrogen in tubes, tested em to see if theyre pure (if get a bark when u put a lighter to the tube, its not pure). need help answering these questions::__
Have a burning splint about 15 cm long ready to introduce into the bottle of hydrogen just after it's lifted, mouth down and held vertically, from the glass plate. Observe carefully as the burning splint is slowly inserted into the bottle of hydrogen. Watch the mouth of the bottle carefully, as the splint is slowly withdrawn from the bottle. Insert the splint a second time, & again withdraw it slowly. Observe the inside walls of the bottle
9.Will the splint bum in the atmosphere of hydrogen? Explain.
10.Where is combustion taking place? Explain.
11.What did you observe on the walls of the bottle? Explain
12.Why does a test tube of hydrogen mixed w/air Xplode/Bark while a test tube of pure hydrogen burns quietly?
13.)Balance: Zinc + Sulfuric Acid =
Hydrogen + Oxygen =

2007-01-17 12:21:00 · 3 answers · asked by truckin_90 2

2007-01-17 12:12:26 · 8 answers · asked by twentyfour 2

2007-01-17 12:01:47 · 10 answers · asked by hannahb 1

here can you help me with these?

1 C12H22O11 + ___________ --> _________ + ____________
2 C7H14 + ____________ --> ____________ + ____________
1 CH4 + 2 __________ --> 1 _____________ + 2 ________
2 C2H6 + _______________ --> __________ + _________

2007-01-17 12:00:55 · 1 answers · asked by I ♥ me 4

When 50ml of liquid water at 25 celsius is added to 50 ml of ethanol, also at 25 celsius, the combined volume of the mixture is considerably less than 100 ml. give a possible explanation

2007-01-17 11:57:56 · 1 answers · asked by glen_impulsion 1

2007-01-17 11:55:18 · 9 answers · asked by hannahb 1