Chemistry - September 2006

2006-09-18 17:50:25 · 8 answers · asked by 1hotmama 3

My answer is 36.95% Na2co3 and 47.29%NaHCO.... is this right?

A sample weighing 0.5375 g and containing Na2CO3 (106.0 g/mol), NaHCO3 (84.01 g/mol), and inert material is dissolved and titrated with 0.1014 M HCl. The first end point volume (phenolphthalein end point) is 13.41 mL and the second end point volume (bromocresol green end point) is 69.65 mL. Calculate the weight percentage of Na2CO3.

2006-09-18 17:45:44 · 4 answers · asked by vem1225 1

Answers:
A.) KO2
B.) NaF
C.) KBr
D.) I2

2006-09-18 17:39:37 · 3 answers · asked by Anonymous

Answers:
A.) calcium
B.) Magnesium
C.) Cesium
D.) Sodium

2006-09-18 17:38:38 · 5 answers · asked by Anonymous

Answers:
A.) H2O is an ionic compund
B.) H2O is a polar covalen molecule
C.) H2O is a nonpolar covalent molecule
D.) H20 has a low dpole moment

2006-09-18 17:28:05 · 14 answers · asked by Anonymous

2006-09-18 17:24:01 · 4 answers · asked by Anonymous

They say most men like blondes. Why is that?

2006-09-18 16:58:11 · 7 answers · asked by motherof2 2

2006-09-18 16:52:51 · 1 answers · asked by kristie 1

They must have some sort of air vents that take all the helium out of the air or something right??? Or do they make it? Is helium it's own element?

2006-09-18 16:49:55 · 5 answers · asked by Anonymous

i was given this question and for some reason no matter what i try to put in as the answer i get the answer wrong. This is very aggrivating since this question is extremely easy, and goes as follows (please explain your answer).

"In the following calculation


( ( (5.70 x 11.41) − 7.2356) ÷ 0.053 ) + 1

the number 1 is defined as exact.

Give the correct answer to this calculation with the correct number of significant figures. "

2006-09-18 16:29:54 · 9 answers · asked by Paul S 2

2006-09-18 16:03:31 · 8 answers · asked by midgetskater12 1

Archeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14^C present in the object. The amount of isotope decreases in a first-order process. If 15.5% of the original amount of 14^C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of 14C is 5730 yr. (answer in units of years)

2006-09-18 15:47:26 · 3 answers · asked by buttrefly007 1

2006-09-18 15:45:43 · 10 answers · asked by dpjrocheleau 2

2006-09-18 15:38:46 · 13 answers · asked by brad l 2

2006-09-18 15:29:54 · 3 answers · asked by Anonymous

2006-09-18 15:28:37 · 9 answers · asked by Anonymous

2006-09-18 15:21:34 · 4 answers · asked by Anonymous

2006-09-18 15:15:45 · 22 answers · asked by Justine 2

2006-09-18 15:08:46 · 3 answers · asked by ? 1

2006-09-18 14:51:37 · 6 answers · asked by Rachel M 1

I need the methodology and step by step proccess of how to get the percent of fat in butter.It needs to be accomplishable by high school students.

2006-09-18 14:50:39 · 5 answers · asked by denxxchua 3

2006-09-18 14:48:51 · 1 answers · asked by Sharmin Sultana Dipti 1

2006-09-18 14:42:15 · 3 answers · asked by Anonymous

Like that "Man Law" commercial

2006-09-18 14:40:19 · 5 answers · asked by Chris 2

2006-09-18 14:17:09 · 8 answers · asked by 1hotmama 3

2006-09-18 14:11:29 · 6 answers · asked by degrassi_27 2

chemistry class

2006-09-18 14:02:49 · 3 answers · asked by alfred l 1

chemistry class

2006-09-18 14:02:35 · 2 answers · asked by alfred l 1

chemistry class

2006-09-18 14:00:57 · 2 answers · asked by alfred l 1

ok i get what u r saying but can u explain what the book is saying: The periodic table can be divided into 2 sections. one section consists of the first to groups, Groups 1 and 2, plus the elements in Groups 13-18. these 8 groups are called the representaive elements. the elements in Groups 3-12 are called transtion elements.

2006-09-18 13:52:03 · 4 answers · asked by degrassi_27 2