Chemistry - March 2007

mylar (or foil) balloons seem to float for longer than a week, while a latex balloon will only float for a day when filled with helium. This is because the metal coating on the balloon prevents the helium atoms from diffusing out. I was just wondering if spray painting a latex balloon with silver spray paint (containing aluminum powder usually) would have a similar effect and keep it a float longer? Would the oil from the spray can break the balloon? Thanks.

2007-03-02 20:29:28 · 5 answers · asked by meow2much 2

2007-03-02 20:12:21 · 3 answers · asked by kid 2 2

We have added starch to pancreatin. You know that pancreatin contains several enzymes: amylase, lipase. trypsin and chymotrypsin, and nucleases. So basically, it'll breakdown starch into maltose. Then we added benedict reagent and heated it for about 5 minutes. It turned dark green solution! There is no brick red precipitate as we've all expected. What could be possibly the reason behind this? Thanks :)

2007-03-02 20:12:10 · 2 answers · asked by MiG 1

would u place them in the same group or different groups due to the difference in atomic masses. explain (Mendeleev's periodic table)

2007-03-02 19:41:34 · 4 answers · asked by prateekf1 1

plsssssssss. Im begging please help me. I know that i must be the one to do this but there still homework i need to do. pls if you just can help me. I really appreciate it. By the way im a junior student highschool

2007-03-02 19:36:17 · 1 answers · asked by cloud 1

the wavelength of a thermal neutron at 300K is lambda.What is the wavelenght of the neutron when at 1200K???(express in terms of lambda)

2007-03-02 19:27:00 · 4 answers · asked by naughtyme12345 1

2007-03-02 19:23:36 · 8 answers · asked by melbournewooferblue 4

2007-03-02 19:19:04 · 6 answers · asked by hiscageofstars 1

Consider the BP's of NH3 and PH3. Which has the higher BP and why?

2007-03-02 19:16:34 · 3 answers · asked by hiscageofstars 1

2007-03-02 19:15:28 · 3 answers · asked by hiscageofstars 1

Would the sodium explode while the chlorine dissolves in the water?

Would the chlorine and sodium mix to make table salt and dissolve in the water?

What would happen and why?

2007-03-02 18:02:37 · 4 answers · asked by bevmoonshine 2

2007-03-02 17:51:17 · 4 answers · asked by Griffin Monster 1

such as graphs
formulas
tables
periodic table/electronegativity and such
like what do i have to memorize?=(
and what do i not have to?

2007-03-02 17:11:53 · 1 answers · asked by cindy n 1

Why the metal conduct electricity when they are solid?

2007-03-02 17:08:14 · 3 answers · asked by unhandy 2

Does the common-ion effect change the value of Ksp? Explain.

Does the common-ion effect change the value of the ion product (Q)? Explain.

please help mee. i can't find it in the bookk

2007-03-02 16:43:09 · 2 answers · asked by Anonymous

2007-03-02 15:48:36 · 2 answers · asked by Curious George 4

2007-03-02 15:12:04 · 5 answers · asked by Anonymous

How can I make lots of carbon dioxide gas a lot by mixing
2 or more acids and bases. Can you tell me by the simple name, not by the element equation that is used on wikipedia.
Can you give a website or just tell it on Yahoo! Answers

2007-03-02 14:51:58 · 2 answers · asked by Anonymous

2007-03-02 14:51:07 · 4 answers · asked by bird 67 2

2007-03-02 14:44:31 · 7 answers · asked by Didi 1

How many grams of potassium chlorate decompose to form potassium chloride and 435 mL O2 at 128°C and 745 torr?

_____ g.


2 KClO3(s) 2 KCl(s) + 3 O2(g)

2007-03-02 14:38:20 · 2 answers · asked by Help me Please!!!!.... 1

2007-03-02 14:38:16 · 7 answers · asked by bird 67 2

A 344 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 628 mmHg. Calculate the moles of Ar present.
_____ mol

i dont know what formula to use.....

2007-03-02 14:34:53 · 1 answers · asked by Help me Please!!!!.... 1

2007-03-02 14:23:47 · 2 answers · asked by no_one_from_nowhere2000 1

What happens chemically when each is added to hard tapwater?

Which would be preferable to add to a child's bath?

2007-03-02 14:20:12 · 3 answers · asked by Silverwolf 4

any having do do with fire but is awesome

2007-03-02 14:16:03 · 11 answers · asked by no_one_from_nowhere2000 1

This might have something to do with the structure of caffiene but i am not sure!!!

2007-03-02 14:06:48 · 4 answers · asked by Anonymous

, which of the two isotopes occurs in larger numbers naturally?

2007-03-02 13:55:35 · 5 answers · asked by Anonymous

to 0.20 M NH3/0.17 M NH4Cl buffer solution

2007-03-02 13:54:07 · 1 answers · asked by mitch v 1

7.2 (sigma greek letter), 5H
2.9 (sigma greek letter), 2H


I have tried NUMEROUS times to answer this question -- help is MUCH needed..thank you.

2007-03-02 13:51:08 · 2 answers · asked by Anonymous