Chemistry - January 2007

2007-01-01 10:59:06 · 9 answers · asked by big guy 1

Ag + Cu(NO3)2 ---> ____________

the 3 and 2 are subscript numbers.

it's a single displacement reaction, and Ag has a charge of 1, NO3 has a charge of -1.

can you explain every single step, please, because i'm really confused.

Thanks!

2007-01-01 10:51:13 · 5 answers · asked by Ann 3

I need help with the following multiple choice questions, your help is greatly appreciated.

After 32 days, 5 milligrams of an 80-milligram sample of a radioactive isotope remains unchanged. What is the half-life of this element?

1) 8 days
2) 2 days
3) 16 days
4) 4 days

What is the total mass of 222Rn remaining in an original 160-milligram sample of 222Rn after 19.1 days?

1) 2.5 mg
2) 5.0 mg
3) 10. mg
4) 20. mg

Which element forms an ion that is larger than its atom?

1) aluminum
2) chlorine
3) magnesium
4) sodium

Which element is so active chemically that it occurs naturally only in compounds?

1) potassium
2) silver
3) copper
4) sulfur

2007-01-01 10:34:24 · 3 answers · asked by anonydipity_09 3

How smart Do you think the N.S.A is 200 years ago dirt floors!?
How smart Do you think the N.S.A is 200 years ago dirt floors!
do they not think a higher inetllgnece that made the billions of computational d.n.a that they have found on this planet and yet what they are doing know There are knows knowns and unknows and they have taken all technolgy away 1950 never happen!!!!
www.beyond-science.com www.beyond-science.net

2007-01-01 09:56:21 · 2 answers · asked by Anonymous

2007-01-01 09:47:23 · 10 answers · asked by Traven O 1

2007-01-01 09:32:09 · 22 answers · asked by Traven O 1

Describe what will be observed.

2007-01-01 09:26:41 · 4 answers · asked by ? 3

When immersed in hot water, like in a bath tub, do we sweat, since we are hot; but on the other hand there's already water around us... so do we sweat?

2007-01-01 09:03:09 · 11 answers · asked by flobber238 2

2007-01-01 08:48:08 · 3 answers · asked by Anonymous

2007-01-01 08:15:13 · 3 answers · asked by Anonymous

1. zinc and lead (II) nitrate react to form zinc nitrate and lead

2. aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas

3. potassium metal and chlorine gas combine to form potassium chloride.

4. calcium hydroxide and phosphoric acid react to form calcium phosphate and water.

**for number 1 i started out as Zn + Pb (NO3)2 > Zn(NO3)2 + Pb
did i at least start it off right??

2007-01-01 08:14:59 · 4 answers · asked by Anonymous

2007-01-01 08:13:57 · 3 answers · asked by Anonymous

Water will boil at 22 degrees Celsius if the pressure on the surface of the water is:

Why is the answer: 19.8 mmHg?

2007-01-01 08:09:38 · 1 answers · asked by Anonymous

do ya kno??

2007-01-01 08:07:37 · 7 answers · asked by <@>:**MIrAndA**:><@ 1

2007-01-01 07:50:34 · 2 answers · asked by Anonymous

2007-01-01 07:41:05 · 11 answers · asked by i luv strawberries!! 2

(a) How many molecules of methane are found in 16.0g of methane gas?

(b) How many atoms of oxygen are found in one mole of oxygen gas?

(c) How many atoms of oxygen are found in one mole of ozone?

(d)How many moles of NaOH are found in 120g of NaOH?

(e) What is the mass, in grams, of 3.01x10^23 formula units of NaOH?

(f) What is the mass, in grams, of 6.023x^25 molecules of ethanol?

Show work plz.

2007-01-01 07:29:01 · 3 answers · asked by Snowboarder91 3

I have 5.0 grams of a salt dissolved in 25.0 mL of water. I have the temperature of the solution.

Trial One:
highest temperature: 24.0 C
lowest temperature: 11.0 C

Trial Two:
highest temperature: 25.0 C
lowest temperature: 13.0 C

Calculate the heat of solution in J/g for each trial and the average heat of solution. (delta H sub s)

2007-01-01 06:56:43 · 1 answers · asked by KTIZZLE 1

Which choice represents the correct order of activity for Group 17 elements?

(Note: > signifies more active than) and also, i'm not sure if activity means how reactive it is, but i'm pretty sure that's it.

1) iodine>bromine>chlorine>flourine
2) flourine>bromine>chlorine>iodine
3) bromine>iodine>flourine>chlorine
4) flourine>chlorine>bromine>iodine

thanks in advance for any help!

2007-01-01 06:43:11 · 4 answers · asked by Anonymous

2007-01-01 06:39:56 · 1 answers · asked by Anonymous

2007-01-01 06:38:34 · 2 answers · asked by Anonymous

2007-01-01 06:33:53 · 1 answers · asked by Anonymous

i need a science fair tpic and think this is a good idea but cant find any information on how to turn a piece of wood incombustible, i think it ends up turning into a rock or somehting. any suggestions?

2007-01-01 06:14:03 · 4 answers · asked by simplicity 2

do they damage environment? how do they react with diff things?

2007-01-01 06:04:34 · 9 answers · asked by YabbaJabba 3

I am doing my science exrta credit and I just wanted to make sure that there are 2 protons, 2 electrons, and 2 neutrons in an atom of helium. Is that corrct?

2007-01-01 05:51:15 · 9 answers · asked by Jewels 2

2007-01-01 05:47:49 · 10 answers · asked by ali 1

I have a science project tomorrow and i was wondering if these were soltuions/suspentions.

-Milk
-Egg White
-Egg Yolk
-Windex
-Pam
-Dawn
-Sodas

***** Please its a huge help

2007-01-01 05:25:22 · 3 answers · asked by Anonymous

i've been asked to prepare one mole of sodium chloride. how do you do that?

2007-01-01 05:16:58 · 3 answers · asked by i like turtles 3

Two questions.

Is an apple heterogeneous or homogeneous?

Is carbon monoxide a compound??

2007-01-01 05:01:45 · 7 answers · asked by Anonymous

2007-01-01 04:59:49 · 3 answers · asked by mahy 1