Chemistry - June 2007

2007-06-07 05:27:21 · 3 answers · asked by rmthanni 2

2007-06-07 05:26:46 · 7 answers · asked by Vincent A 3

2007-06-07 05:24:35 · 3 answers · asked by aboozar h 1

2007-06-07 05:21:46 · 2 answers · asked by aboozar h 1

1) Convert the pressure 2.50 atm to kPa ?
2) The pressure of a sample of helium is 2.0 - mL. If the container is compressed to 10 mL without changing the temperature, what is the new pressure?

2007-06-07 05:18:41 · 1 answers · asked by emilyz 2

though C and Si belong to the same group, CO2 do not polymerise but Si O2 polymerises why?
please do help me to find the answer.

2007-06-07 05:18:10 · 2 answers · asked by Anonymous

Brønsted and Lowry defined a base as any substance that can accept a hydrogen ion.

True or false?

2007-06-07 05:17:42 · 4 answers · asked by degrassi_paige16 1

Arrhenius defined acids as substances that generate hydroxide ions, OH¯, when dissolved in water.


True or false???

2007-06-07 05:16:50 · 3 answers · asked by degrassi_paige16 1

Acids react with bases so that the properties of both are lost to form water and a salt.

A. acidification
B. neutralization

2007-06-07 05:13:28 · 7 answers · asked by degrassi_paige16 1

Bases always react with metals.

True or False?

2007-06-07 05:11:00 · 7 answers · asked by degrassi_paige16 1

Both acids and bases are electrolytes—good conductors of electric current.

True or false?

2007-06-07 05:09:38 · 8 answers · asked by degrassi_paige16 1

The process?

2007-06-07 05:03:26 · 3 answers · asked by Bloggy 2

magic chemistry

2007-06-07 05:01:39 · 3 answers · asked by ali b 1

2007-06-07 04:56:42 · 2 answers · asked by rmthanni 2

BCl3- Emphasize the completion of the octet rather than any minimization of formal charge. Enter your answers as a sequence of numbers (one decimal place) separated by commas (for example, 1.3,1.0,1.5,2.0,3.0).

A) N2
B) PO43-
C) PCl5
D) H2
E) BCl3

Can someone please help me with this question? I have an exam on Friday and I need to know how to work this out :(

2007-06-07 04:37:36 · 3 answers · asked by Confused 1

1. List 6 strong acids
2. List base from Gr I alkaline and Gr II Alkaline earth
3. Define Alkalinity


THANKS!!

2007-06-07 04:26:04 · 4 answers · asked by augustina 3

1. How many joules of energy are required to raise the temperature of 65 g of iron from 25 C to 95 C?

2. The specific heat of zinc is 0.096 cal/g C. Determine the energy required to raise the temp of 250.0 g of zinc from room temp (24C) to 150C.

3. One gram of anthracite coal gives off 7000. cal when burned. How many joules is this? How many grams of anthracite are required to raise the temp of 4.0 L of water from 20.0 C to 100.0 C?

Please show work to help me understand better how to complete these type of questions.

2007-06-07 04:15:28 · 1 answers · asked by Andrea B 2

2007-06-07 02:50:21 · 5 answers · asked by medical aspirant 1

just a quik test of the response of the instrument

2007-06-07 02:12:57 · 3 answers · asked by Anonymous

2007-06-07 01:41:22 · 8 answers · asked by Anonymous

Please help me figure out this puzzle

2007-06-07 01:28:37 · 1 answers · asked by paws78109 2

What are the 5 historical era in the development of chemistry? Please help!! I just need the eras and maybe a little bit of definition!

2007-06-06 23:32:30 · 1 answers · asked by Sophia ~ 1

Water can be decomposed by electrolysis into hydrogen gas and oxygen gas. What mass of water must decompose to fill a 4.00 L flask to a total pressure of 2.63 atm at 298 K with a mixture hydrogen and oxygen? (R = 0.08206 L·atm/mol·K)

2 H2O(λ) → 2 H2(g) + O2(g)
a. 27.9 g
b. 7.75 g
c. 6.22 g
d. 11.6 g
e. 5.17 g

2007-06-06 23:28:59 · 2 answers · asked by Anonymous

2007-06-06 21:57:47 · 4 answers · asked by Anonymous

mention how it can be maid more useful

2007-06-06 20:27:00 · 1 answers · asked by mastdudenav 1

Sorry if this sounds silly, but is chemistry supposed to make sense? I flipped through the book, and most of the symbols are ones I'm unfamiliar with. I'm taking chemistry next year, and don't know what to expect.

2007-06-06 19:59:32 · 6 answers · asked by lirael1019 1

2007-06-06 19:11:22 · 1 answers · asked by Abhilash B 1

can anyone telll me wich of the following are redox reactions? and explain why?

A. 2Na +Cl2 -----> 2NaCl
B. C + O2 ---> CO2
C. 2H2O -----> 2H2 + O2
D. NaCl + AgNO3 ----->AgCl + NaN03
E. NH3 + HCl -----> NH4+ + Cl-
F. 2KCl03 -----> 2KCl + 3O2
G. H2 + Cl2 ----> 2HCl
H. H2SO4 + 2KOH -----> K2SO4 + 2H2O
I. Zn + CuSO4 -----> ZnSO4 + Cu

2007-06-06 18:52:00 · 2 answers · asked by yofosho 1

pls give me the reaction equation when AL2O3(s) reacts with H2SO4 or NAOH.
thanks!

2007-06-06 18:21:10 · 1 answers · asked by blizzard 2

2007-06-06 18:17:29 · 1 answers · asked by tweedledeuk 1