Chemistry - September 2007

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2007-09-27 10:38:03 · 3 answers · asked by Anonymous

for carbon monoxide and amino group? i have no clue what 'amino group' means. sooo ya.
plz help?

2007-09-27 10:18:48 · 7 answers · asked by lsjfl;ajfoiweajfmsdfjkj =D 1

1) Is the following sentence true or false? A gas absorbs energy as it changes to a liquid.

2) For the process boiling and evaporation, what is the phase change, where it occurs, and the temperature.
Thank you all!

2007-09-27 10:15:35 · 3 answers · asked by lover2 1

they are dry mixtures that is all stirred up, now i have to find a way to not necessarily separate them, but to find the masses of each of them.

2007-09-27 10:02:25 · 3 answers · asked by Anonymous

What volume of 0.150 M Na3PO4 is required to precipitate all the lead(II) ions from 140.0 mL of 0.300 M Pb(NO3)2?

2007-09-27 09:55:05 · 2 answers · asked by s.weiss 1

Need Help I Chem

2007-09-27 09:30:52 · 6 answers · asked by web F 1

ok, so im sort of stuck on the last question. please help!!!

the carbon-14 isotope is radioactive and undergoes beta decay. the half life of the carbon-14 isotope is about 5700 years.

a) give the atomic number and the mass number of the species formed when carbon-14 undergoes beta decay.

b) how much of a 20g sample of carbon-14 would remain after 17190 years? please show how you get your answer.

c) the presence of the carbon-14 isotope is used to date old materials such as wooden boats and fabrics such as the "turin shroud" explain why the carbon-14 isotope is very suitable choice for dating such materials.

thanks :)

2007-09-27 09:28:38 · 4 answers · asked by Anonymous

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line diagram....

2007-09-27 09:20:59 · 3 answers · asked by C'est Comme Un Rêve 3

2007-09-27 09:18:20 · 3 answers · asked by s.weiss 1

Can anyone tell me some elements found on the periodic table that are found in living things besides oxygen???

2007-09-27 09:10:35 · 4 answers · asked by Kev 2

I'd appreciate it if someone could answer these 2 quesions. Thanks..

1.Which of the following is one possible form of pentane?

A) CH3CH2CH2CH2CH3
B) CH3CH=CHCH2CH3
C) CH3CH2-O-CH2CH2CH3
D) CH3CH2CH2CH2CH2CH3
E) CH3CH2CH2CH2CH2NH2

2. Calculate the molar mass for Mg(ClO4)2.

2007-09-27 09:02:28 · 4 answers · asked by Giulio M 5

Epsom salts, a strong laxative used in veterinary medicine, is a hydrate, which means that a certain number of water molecules are included in the solid structure. The formula for Epsom salts can be written as MgSO4•xH2O, where x indicates the number of moles of water per mole of magnesium sulfate. When 5.061 g of this hydrate is heated to 250*C, all the water of hydration is lost, leaving 2.472 g of MgSO4. What is the value of x? [Hint: Find the moles of water lost & moles of compound MgSO4 remaining. The ratio of water to compound = coefficient x]

2007-09-27 08:53:27 · 4 answers · asked by helpme77 1

only numbers

2007-09-27 08:37:45 · 3 answers · asked by Kristina H 1

1) Neutralization occurs when an acid is combined with a base. Which of the following is an example of neutralization?
a) adding an acid to water
b) using an antacid to treat heartburn
c) washing hair with a low pH shampoo
d) making soap

2) Sponge toffee is made by mixing sugar, corn syrup, vinegar, and baking soda. The reason bubbles form in the sponge toffee is
a) corn syrup produces bubbles when heated
b) sugar and vinegar produce a gas that creates the bubbles
c) mixing produces the bubbles by bringing air into the mixture
d) vinegar and baking soda react to produce carbon dioxide, which forms the bubbles




Here are my answers :
1 - b
2-d


but im not sure.. and can someone please explain to me the process of Neutralization?
thank you so much!

2007-09-27 07:55:31 · 3 answers · asked by Anonymous

Does anyone know how to get the cation, anion and formula for calcium phosphate?

Thanks very much!!

2007-09-27 07:51:46 · 2 answers · asked by James 1

If 45.5 mL lead(II) nitrate solution reacts completely with excess sodium iodide solution to yield 0.540 g precipitate, what is the molarity of lead(II) ion in the original solution?

2007-09-27 07:51:40 · 2 answers · asked by ronnie c 1

Radon-222 is radioactive but almost chemically inactive. explain please

2007-09-27 07:43:23 · 5 answers · asked by Anonymous

And is this hydrogen flammable?(safety reasons)

2007-09-27 07:17:44 · 3 answers · asked by jamesc9009 1

(C4H10) + (O2) ------> (CO2) + (H2O)

2007-09-27 07:05:58 · 4 answers · asked by natsyy 1

2007-09-27 07:04:20 · 2 answers · asked by prime 3

With which of the following groups is sodium most likely to form a chemical bond: Alkaline,earth metal,metalloids,halogens, or noble gases? Why?

2007-09-27 07:02:54 · 1 answers · asked by KrAzZiELaOsBoI 1

and the Oxidation Number for Beryllium

2007-09-27 07:01:32 · 1 answers · asked by KrAzZiELaOsBoI 1

2007-09-27 06:58:54 · 1 answers · asked by Anonymous

1: Which substance is readily converted from a liquid to a solid by chemical reaction with hydrogen?
cotton-seed oil
glycerin
kerosene
mercury


2: The ability of a substance to remove oxygen from a compound is called
oxidation
hydrogenation
electrolysis
reduction


3: When passed over hot copper oxide, hydrogen acts as
a catalyst
an oxidizing agent
a reducing agent
a solute


4: Hydrogen can be prepared by reacting cold water with
aluminum
iron
platinum
sodium


5: The safest way to make hydrogen in the laboratory is to add hydrochloric acid to
calcium
iron
potassium
sodium


6: Hydrogen may be formed when steam reacts with hot
copper
iron
mercury
silver


7: The lightest element known is
boron
helium
hydrogen
lithium


8: Hydrogen is
less dense than air and inert
very soluble in water and combustible
odorless and a reducing agent
denser than air and tasteless


9: Hydrogen may be obtained

2007-09-27 06:45:45 · 4 answers · asked by kimberly 1

could someone tell me the exact chemical names of Mn2O3, MnO2, MnO3 and Mn2O7, eg: manganese (II) oxide, i got manganese (II) oxide for all of them! CLEARLY WRONG!
An explanation would be good,

thank you very much

2007-09-27 06:39:15 · 3 answers · asked by Anonymous

A stopper was found to have a mass of 5.06g. When placed in a graduated cylinder containing 45.2mL of water, the volume of the stopper was found to be 49.4mL. What is the density of the stopper?

2007-09-27 06:38:48 · 4 answers · asked by furikuri405 1

What happens when you place sodium ethanoate powder in dilute hydrochloric acid and warm the mixture?

I would also appreciate any equations (or reaction mechanism if applicable)

2007-09-27 06:28:16 · 2 answers · asked by H 1

2007-09-27 06:16:17 · 2 answers · asked by Flashing Lights 2

Acidification of sodium bicarbonate (NaHCO3) produces carbon dioxide in a two step process.

The first step produces carbonic acid (H2CO3). Write and balance the molecular equation for the first step of the reaction of sodium bicarbonate with HClO4. (Do not include symbols for state of matter in your answer).

The second step is the decomposition of carbonic acid to carbon dioxide. Write and balance the molecular equation for the second step.

Now write the overall net ionic equation for the acidification of NaHCO3 to produce CO2.

What is the molar ratio of CO2 produced to NaHCO3 decomposed?
What mass of CO2 will be produced by the complete decomposition of 1156 mg of NaHCO3?

Thank you for any help.

2007-09-27 06:14:49 · 1 answers · asked by Anonymous

Determine the structure of Benzene, and important organic compound, proved to be a difficult challenge for chemists in the 19th century. A sample of benzene was analyzed and found to consist of 1.43g of carbon and 0.119g of hydrogen. Given that the molar mass of benzene is 78.0g, determine both the empirical formula and the molecular formula for benzene.

2007-09-27 06:10:42 · 3 answers · asked by Craig x 1