Chemistry - January 2007

2007-01-16 17:23:51 · 3 answers · asked by gemini13 1

2007-01-16 16:28:31 · 4 answers · asked by georgie0515 1

2007-01-16 16:26:38 · 3 answers · asked by Azam R 1

What is the mass of 7.24 X 10 (23rd power) molecules of barium oxide?

Hoping someone can let me know if I did this right:
I added Ba (137.3) and O (16.00) together and got 153.3

I then multiplied 153.3 to 7.24 for an answer of
1109.90 x 10 (23rd power).

This just doesn't look right though; did I miss a step?

2007-01-16 16:08:17 · 2 answers · asked by Missy 2

2007-01-16 15:35:36 · 6 answers · asked by hazz r. 1

2007-01-16 15:14:38 · 2 answers · asked by hazz r. 1

water: 100 mL

C12 H22 O11: 45g

2007-01-16 15:08:33 · 4 answers · asked by Anonymous

what is the answer in a very easy way to understand if possible thank you!

2007-01-16 15:06:02 · 3 answers · asked by Anonymous

That is a sample question. If someone could answer it and guide me through it I'd be very thankful....

A 1.1 g sample of magnesium is treated with 9.5 g of sulfuric acid.

Mg(s) + H2SO4(aq) MgSO4(aq) + H2(g)

(a) How many grams of hydrogen can be produced?

(b) If 0.060 g of hydrogen is actually obtained, what is the percent yield?

(c) Calculate the number of moles of excess reagent remaining at the end of the reaction.

2007-01-16 14:52:19 · 2 answers · asked by Patrick<>Houston 2

2007-01-16 14:46:00 · 3 answers · asked by Ken 1

Yea I Need Help. What two cemecals are made in the stomach.

2007-01-16 14:19:42 · 2 answers · asked by speceful1 1

Assume that water absorbs light of wavelength 3.00x10^-6 m with 100% efficiency. how many photons are required to heat 1.00g of water by 1.00K? the heat capacity of water is 75.2J/mol K.

all i have so far is hc/ lambda.

2007-01-16 14:16:51 · 2 answers · asked by Windy - 1

I just got the grade on my Sr science project and it was a 98% so thankyou all for helping me when i asked a question. this means that i will pass chemistry 2

if u want to report me because this isnt a q fine i dont care

2007-01-16 13:58:25 · 1 answers · asked by Anonymous

It's not the coke that you drink.

2007-01-16 13:38:46 · 6 answers · asked by NIVELINA K 3

What's the equation to show how the salt K2SO4 ionizes in water....?

2007-01-16 13:36:28 · 2 answers · asked by Anonymous

2007-01-16 13:27:24 · 5 answers · asked by omaidamontes8 1

It has to do with the conversion of matter to energy/fusion/fission right?

2007-01-16 13:22:28 · 4 answers · asked by Anonymous

THanks! If you could help me that'd be great, I have a chem test very soon and need this answered :)

2007-01-16 13:00:20 · 3 answers · asked by shambhalachick 1

2007-01-16 12:57:29 · 8 answers · asked by Anonymous

what are subscripts?

what are molecules,elements,coumpounds?

stainless steel is a combanation of what twometals?

what are valeme electrons?

what is a anion? cation?

where are alkali metals?

what does polyatomic mean?

what ia a pure substance?

what is vacosity?

2007-01-16 12:49:04 · 3 answers · asked by Anonymous

After taking two soluable compounds and making an insoluable compound, how can I prove I made what I wanted to?

2007-01-16 12:45:10 · 4 answers · asked by A.I.Disguise 2

if so what country has them

2007-01-16 12:43:50 · 2 answers · asked by ANTI-ILLEGAL IMMIGRATION 1

i'm really confused. therefore, i'm desperate for help.

2007-01-16 12:41:24 · 2 answers · asked by alexie. 4

2007-01-16 12:39:46 · 7 answers · asked by chocolatelover 1

2007-01-16 12:34:00 · 2 answers · asked by Anonymous

We got this question today in class as just trivia (first day of class) and I can't find it anywhere online --- What element is found in antibiotics and it also keeps away ticks?
Do any of you Chemists out there know what this is? Thanks for your help!
First person to answer with link that tells me what element is found in antibiotics gets the prize!

2007-01-16 12:28:49 · 2 answers · asked by shomaliatimalla 3

Just wondering if I figured this out right...Potassium (K) contains 19 valence electrons and Bromine (Br) contains 35, Oxygen (O) conains 8 and Carbon (C) would then contains 6..am I completely wrong? If I am could someone correct me? Thanks!

2007-01-16 12:28:39 · 9 answers · asked by Anonymous

or just solve these?

P1V1 = P2V2

2007-01-16 12:28:13 · 6 answers · asked by Anonymous

Volume of NaOH, mL; pH
0; 2.88
5; 4.15
10; 4.58
12.5; 4.76
15; 4.93
20; 5.36
24; 6.14
24.9; 7.15
25; 8.73
26; 11.29
30; 11.96

Just from this data, how can I find pH at the equivalence point, Ka, and pKa (actually just need to know how to find one of the two Ka or pKa and I can get the other)

please

2007-01-16 12:25:55 · 2 answers · asked by Anonymous

2007-01-16 12:13:50 · 8 answers · asked by Anonymous