Chemistry - November 2006

I need help on my science project!!!!!!!!!!

2006-11-29 06:40:31 · 1 answers · asked by Anonymous

A system delivers 1275 J of heat while the surroundings perform 855 J of work on it. Calculate internal energy (delta E) in J.

2006-11-29 06:28:16 · 2 answers · asked by Anonymous

The standard enthalpy of combustion of methanol (CH3OH(l)) is -726 kJ·mol-1. How many kilojoules of heat are released for each 1.0 gram of methanol (CH3OH(l)) which is burned?

2006-11-29 06:27:32 · 5 answers · asked by Anonymous

Aluminum metal shavings (10.0g) are placed in 100. mL of 6.00 M of hydrochloric acid. What is the maximum volume of hydrogen, measured at STP, which can be produced?

2Al(s) + 6HCl(aq) yields 2AlCl3(aq) + 3H2(g)

2006-11-29 06:25:54 · 1 answers · asked by Anonymous

CH4
H2S
CCl2F2

2006-11-29 06:22:18 · 3 answers · asked by Meg ♥ 1

2006-11-29 06:20:16 · 2 answers · asked by theresa_marie199 1

2006-11-29 06:05:20 · 4 answers · asked by Hannah P 1

2006-11-29 06:04:21 · 2 answers · asked by Hannah P 1

2006-11-29 06:03:29 · 5 answers · asked by frickenawesomekoreanandyouknowit 2

Why does African hair always want to stand upright and other ethnic hair lay flat?

2006-11-29 06:02:31 · 4 answers · asked by Anonymous

Which of the following pairs of 0.1 M aqueous solutions would result in the formation of a precipitate upon mixing?
a) lead acetate + potassium hydroxide
b) ammonium acetate + cadmium nitrate
c) sodium chromate + nickel(II) iodide
d) strontium perchlorate + iron(II) sulfate

Which of the following pairs of 0.1 M aqueous solutions would result in the formation of a precipitate upon mixing?

a) lead acetate + potassium nitrate
b) sodium chromate + ammonium phosphate
c) nickel(II) nitrate + sodium sulfide
d) strontium perchlorate + iron(II) chloride

2006-11-29 06:00:03 · 1 answers · asked by <3 2

A) cadmium
B) calcium
C) copper
D) zinc

2006-11-29 05:56:30 · 3 answers · asked by frickenawesomekoreanandyouknowit 2

A) 92U235
B) 92U239
C) 93Np239
D) 94Pu239

2006-11-29 05:55:04 · 1 answers · asked by frickenawesomekoreanandyouknowit 2

Is each of the substances below a strong electrolyte? Which ones are not, which ones are? KF ,CH3Cl, H2O, NaOH, CH3COONa

which of the following substances could be used to make a solution that is 0.1 M in Pb2+ ion.

a) Pb(ClO4)2
b) PbCl2
c) PbCrO4
d) PbCO3
e) PbS
f) Pb(NO 3)2

2006-11-29 05:51:03 · 3 answers · asked by HL 1

2006-11-29 05:47:49 · 8 answers · asked by Anonymous

2006-11-29 05:43:21 · 2 answers · asked by PAUL F 1

2006-11-29 05:41:49 · 2 answers · asked by frickenawesomekoreanandyouknowit 2

Can i get the steps for solving?

[H30+] = 1.0 x 10 -4M

[H30+] = 3.0 x 10 -9 M

2006-11-29 05:37:16 · 3 answers · asked by chemistrymagic 1

2006-11-29 05:35:20 · 3 answers · asked by jak 3

2006-11-29 05:17:50 · 2 answers · asked by frickenawesomekoreanandyouknowit 2

2006-11-29 05:17:23 · 2 answers · asked by Randy W 1

With what volume of 5.00 M HF will 6.44 g of calcium hydroxide react completely, according to the reaction

2HF+ Ca(OH)2= CaF2 + 2H2O

2006-11-29 05:16:32 · 1 answers · asked by kenny b 1

2006-11-29 05:03:43 · 5 answers · asked by Kelly L 5

I want to use it for a science fair project

2006-11-29 04:59:20 · 6 answers · asked by cassie m 1

I need someone to help me figure out these questions...please! I need to turn in my Chem hw today.

1. A solution is prepared by dissolving 200.1 g of NaOH (molar mass=40 g/mol) in enough water to make 851 mL of solution. Calculate the molarity of the solution

2. Give the correct formula of ions present when sodium carbonate is dissolved in water?

3. What is the net ionic equation for the reaction of any strong acid with a soluble strong hydroxide base, such as NaOH?

4. What ions are present in a solution of aqueous calcium chloride?

5. What ions are present in a solution of aqueous (NH4)2SO4?

6. What is the net ionic equation for the single replacement reaction Ca (s) + 2 HNO3 (aq)----> H2 (g) + Ca (NO3)2 (aq)

7. What ions are present in an aqueous solution of Iron (III) sulfate?

Thank you!

2006-11-29 04:52:56 · 2 answers · asked by Anonymous

a. C2h5OH(g) + 3 O2(g)----------------2CO2(g) + 3H2O(l) + 1367kj
b.CS2(l) +3O2(g)-----------------CO2(g) +2SO2(g) H'=-1105kj
c.H2O(l)----------------H+(aq) +OH- (aq) H'=+56.2kj
d.H2O(s) + H----------------------H2o(l)

2006-11-29 04:52:07 · 1 answers · asked by Nikki S 1

3.0 moles of NaOH from a 2.0M NaOH solution

Can i please get the steps to solving this?

2006-11-29 04:34:13 · 3 answers · asked by chemistrymagic 1

I was thinking Lord Voldemort but my mum says that it would be too embarrassing for her to say if we had to bring it to the vet or something. Give me inspiration!

2006-11-29 04:26:24 · 11 answers · asked by Anonymous

2006-11-29 04:25:29 · 2 answers · asked by LUKMAN H 1

2006-11-29 04:21:29 · 8 answers · asked by c a t c h 2