Chemistry - June 2007

2007-06-19 06:27:35 · 5 answers · asked by Anonymous

This is the most poewrful bomb in the world but I heard that the Russians wanted to light all the Hydrogen in the air (I think) that is what I heard anyway. They thought that the heat generated could light the Hydrogen in the atmosphere. Is this possible?

2007-06-19 06:21:18 · 5 answers · asked by Look towards the future! 2

measuring is made in normal conditions and reaction is not made with added heat

2007-06-19 06:21:01 · 2 answers · asked by Anonymous

2007-06-19 06:20:01 · 1 answers · asked by goswamisayan 1

Calculate the change in pH (to three decimal places) that occurs in each of the solutions listed below as a result of a ten-fold dilution with water.

0.0500 M HCl

and also

0.0500 M CH3COOH

2007-06-19 06:18:38 · 4 answers · asked by ScienceNut 2

how can i state whether a polar protic or a polar aprotic solvent would increase the yield for a given reaction, and why it has the effect it does?

2007-06-19 06:16:34 · 2 answers · asked by Anonymous

2007-06-19 06:13:58 · 4 answers · asked by Ethelrida L 1

Thanks in advance. Also...a little explanation would be very appreciated.

2007-06-19 06:01:32 · 2 answers · asked by Goddess of the Moon 3

What weight of sodium glycolate should be added to 300 mL of 1.00M glycolic acid to produce a buffer solution with a pH of 4.00?

2007-06-19 05:57:32 · 4 answers · asked by ScienceNut 2

2007-06-19 05:49:45 · 8 answers · asked by SWETA 2

How many pi bonds and/or rings are implied by the formula C5H5N?

please help me out;;

2007-06-19 05:45:35 · 3 answers · asked by alice 1

Which of the following would have the largest molecular Weight?:

Amino Acid
Polypeptide
Protein Chain
Hydrocarbon

2007-06-19 05:44:20 · 4 answers · asked by Anonymous

A buffer of pH 4 is prepared by adding 0.14g of solid sodium ethaonate to 0.1l of 0.1mol/l ethanoic acid.
What will be the new pH if 2.2 mL of HCl are added?
If 4.5mL of NaOH are added?

2007-06-19 05:42:00 · 3 answers · asked by jenna k 1

Does anyone know the stastics behind the average of current doctor's performance in the Organic Chemistry course during College?

2007-06-19 05:36:47 · 2 answers · asked by Anonymous

I need something to be interesting for every major in Chemistry.

2007-06-19 05:35:13 · 9 answers · asked by joy 1

A student allows the evaporating dish and the anhydrous salt for a long time on the lab bench. what will happen to the mass of the content of the evaporating dish as it cools and how could this be prevented

2007-06-19 05:27:46 · 2 answers · asked by Anonymous

Explain and discuss the reaction of :CuSO4∙oH20 and CuSO4∙5H2O? What is the delta H? What is the q=.What is the mass values?

Table 1.1: title
Given:0.783 M
CuSO4  10g
M1 H2O80mL
Ti22.20 ºC
Tf32.60 ºC
ΔT10.4 ºC
ΔH= (q / # moles)(-435.24) / (0.0626)= -6952.7g
Q= -mass x (4.184 J K-1g-1) ΔT

( -10g)(4.184 J K-1g-1 )( 283 K) =

Table 1.2: title
Given:0.5 M
CuSO4 ∙ 5H20 10g
M1 H2O80mL
Ti22.85 ºC
Tf21.40 ºC
ΔT-1.45 ºC
ΔH= (q / # moles)(60.7) / (0.0400)= 1516.7
Q= -mass x (4.184 J K-1g-1) ΔT

( -10g)(4.184 J K-1g-1 )( 271.55K ) =

Table 1.3: title
Given:0.626 M
CuSO4  5g
M1 H2O50mL
Ti-22.40 ºC
Tf-34.40 ºC
ΔT12.0 ºC
ΔH= (q / # moles)(-251.0) / (0.0313)= 1516.7
Q= -mass x (4.184 J K-1g-1) ΔT

( -5g)(4.184 J K-1g-1 )( 285K ) =

Table 1.4: title
Given:0.4 M
CuSO4 ∙ 5H20 5g
M1 H2O50mL
Ti23.55 ºC
Tf22.05 ºC
ΔT-1.5 ºC

2007-06-19 05:24:17 · 1 answers · asked by Gabriel Z 1

A 745 g rectangular piece of Al at 285oC was dropped into 1.75 L of water at 27oC. What will be the temperature change of the metal? (Assume no heat is lost to the surroundings.)
A. 258oC
B. 49oC
C. 236oC
D. 21.6oC

C. 236 is the answer, but how do you get the answer?
I have two equations:
Heat= (Mass)(Specific heat)(Temp change)
Specific heat= (heat)/(mass x temp change)

Al specific heat is 0.900
Water specific heat is 4.184
Could someone show me how to get the answer

2007-06-19 05:21:32 · 4 answers · asked by kk a 1

this is the question I can't figure it out please help me out;;

How many milliliters of concentrated (12M) hydrochloric acid are required to react completely with 10ml of 2-methly-2-propanol?

2007-06-19 05:06:21 · 5 answers · asked by Anonymous

I'm thinking of treating 1-(1,4-cyclodienyl)-1- propanol with concentrated H2SO4 and heat to get 1-(1-propenyl)-1,4- cyclodiene. Will carbocation rearrangement cause my double bond in the propene side chain to form instead at the carbon in the ring, or will the double bond that's already in the ring block the rearrangement from getting to the most stable carbon?

2007-06-19 05:02:09 · 2 answers · asked by Jess125 1

did you know [bath&body works, body lotion, white cherry blossom], has benzyl alcohol, how benefit to person?
want to explain in chemistry.

2007-06-19 04:58:19 · 4 answers · asked by Eden 1

2007-06-19 04:54:33 · 2 answers · asked by Hugo T 1

2007-06-19 04:53:37 · 1 answers · asked by Hugo T 1

Describe separately, tartaric acid and 2-chloro-3-methylpentane, do they obey/disobey the 2^n formula when estimating the possible number of stereoisomers.

Please help/explain, and thank you all for all the help you guys have given me on other organic probs, it really helps me understand it and I appreciate it!!!

THANKS AGAIN!

2007-06-19 04:21:34 · 2 answers · asked by Anonymous

2007-06-19 04:12:50 · 3 answers · asked by shelling 2

2007-06-19 03:46:39 · 2 answers · asked by sheilla 1

i am writting a project on the vit E, and Iwant you to help me with the process for determiniong the vit E content in leafy vegetables

2007-06-19 03:40:27 · 1 answers · asked by motunrayo o 1

I know that boiling point is 100c, but is it possible to heat water above that level?

2007-06-19 02:20:23 · 28 answers · asked by scatalanjim 1

2007-06-19 00:46:51 · 4 answers · asked by jm_coolblue 1

2007-06-18 23:27:30 · 2 answers · asked by jen_greenley 1