Science & Mathematics - 15 November 2007

Heat death is among the ways speculated that the universe as we know it will end up. If that happens, will anything be able to live anywhere at any level of operation? If so, what might life be like for them? Could any civilizations survive into this era?

2007-11-15 07:35:51 · 6 answers · asked by uncleclover 5 in Astronomy & Space

why does the colour of Co^2+ in aq. solution change on adding HCL?

why does colour of Fe^3+ change in presence of NCS-?

2007-11-15 07:34:16 · 1 answers · asked by Anonymous in Chemistry

2007-11-15 07:33:32 · 1 answers · asked by funvonne 2 in Chemistry

http://smg.photobucket.com/albums/v700/XoXCoNnIeEe/?action=view¤t=fdsafdsa.jpg

2007-11-15 07:33:15 · 2 answers · asked by Anonymous in Mathematics

I have to find the x-intercept of y=cube root(-x+1) +2. I worked it out as follows:

(Important: +2 is not part of the cube root, only -x+1 is under the root)

0=cuberoot(x+1)+2
cuberoot(x+1)=-2
x+1=-8*
x=-9

* I cubed both sides to get rid of the cube root.

When I type it in a graphing calculator it appears that x-intercept is actually 9, not -9.

2007-11-15 07:32:32 · 3 answers · asked by IK 3 in Mathematics

2007-11-15 07:30:39 · 8 answers · asked by Anonymous in Weather

A deductive proof is used to prove that the product of any two consecutive whole numbers is even is started below. What could the next step be?

One of the two consecutive numbers is even and therefore has a factor of 2.

A) Since the product is even it has a factor of two.
B) Since the product will also have a factor of 2, the product will be even.
C) Since the numbers have a factor of two they are even.
D) Since the numbers are consecutive their product is even.

2007-11-15 07:30:18 · 2 answers · asked by Anonymous in Mathematics

6y^2 - 36 = 6y

any help would be greatly appreciated

2007-11-15 07:29:17 · 8 answers · asked by alex 1 in Mathematics

Evaluate the effectiveness of each:

Gravity filtration (paper and sand/gravel)
Charcoal filtration
Centrifuging
Distillation

2007-11-15 07:26:32 · 2 answers · asked by Anonymous in Chemistry

It doesn't seem right since the high silica minerals have lots of strong covalent bonds, and the mafics have some weaker ionic bonding.

2007-11-15 07:24:02 · 2 answers · asked by chelseablue 3 in Earth Sciences & Geology

2007-11-15 07:23:09 · 3 answers · asked by Anonymous in Chemistry

Did Kennedy get shot because he wanted to revel UFO´s, did Carter get told by Bush that he cannot revel it? Did Clinton really want to revel it also? Does the (House/Senate) Intelligence Committee know about?

2007-11-15 07:22:48 · 8 answers · asked by freeorbit2000 1 in Astronomy & Space

I need to write and balance the equation.

2007-11-15 07:21:26 · 3 answers · asked by John Smith 2 in Chemistry

2007-11-15 07:21:04 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Which numbers can represent the lengths of the sides of a triangle?

A) (1,3,4)
B) (4,4,9)
C) (5,7,9)
D) (8,5,3)

I tried adding the numbers and dividing them into 180 but they all heve decimals so i think i am doing it wrong Help please-- also could you tell me how you did it?

Thanks!

2007-11-15 07:19:37 · 5 answers · asked by Anonymous in Mathematics

although i probably have the answer in my notes, im confused as to how they work.

2007-11-15 07:18:43 · 0 answers · asked by kellysa111 3 in Biology

Thanks so much!

2007-11-15 07:16:27 · 8 answers · asked by Anonymous in Biology

all non-metallic compounds and draw
the molecular model for any metallic compounds. Tell what kinds of bonds form (pure covalent, polar
covalent, ionic, or metallic), and indicate whether or not there is a resonance hybrid.

CIF3
NO3-1
Ca
MgO
F2

I have no problem with NO3-1, F2, or ClF3.

But I can't figure out what to do with MgO at all, and before I get all the people yelling at me, yes I have been through my text book and everything I can find on the web.

My other issue is Ca. Isn't Ca an atom and not a compound? If it is a compound how does that work?

2007-11-15 07:14:46 · 3 answers · asked by Emmy 1 in Chemistry

if G is afinite group show that the number of nonidentity element that satesfies the equation x^5=e is multiple of 4.
" e is identity"

2007-11-15 07:14:18 · 2 answers · asked by Dana S 1 in Mathematics

AgNO3 +I- ->

HNO3 + Co3^2- ->

could someone please try explain how u do this?

2007-11-15 07:13:35 · 2 answers · asked by Anonymous in Chemistry

2007-11-15 07:09:56 · 1 answers · asked by baby_girl_clover 1 in Biology

No guess and check or simply plugging in numbers allowed!

2007-11-15 07:08:22 · 4 answers · asked by Antichrist Svperstar 1 in Mathematics

1. 5 + 3i

2. -2 + 5i

2007-11-15 07:07:41 · 4 answers · asked by wrongnumber 1 in Mathematics

People will drink light beers, light years away from earth.

2007-11-15 07:06:18 · 6 answers · asked by Anonymous in Astronomy & Space

can someone explain to me in better terms than my book, how we get an answer for:

w+3 over 4w DIVIDED BY w-3 over 2w I am so lost without a teacher in front of me.. I do not recommend online classes without a teacher teaching you math. PLEASE HELP

2007-11-15 07:03:43 · 3 answers · asked by ~*~ victoria ~*~ 1 in Mathematics

2007-11-15 07:03:11 · 6 answers · asked by biomes 1 in Mathematics

what is a far away object not in our solar system?

2007-11-15 07:01:59 · 6 answers · asked by Anonymous in Astronomy & Space

Balance this equation:
AgNO3 + Cu -> Cu(NO3)2 +Ag

What type of reaction is this? Why?

How many moles of silver could be produced by reaction of 3.5 moles of copper?

How many grams of silver could be produced by reaction of 3.5 moles copper?

How many atoms of silver could be produced by reaction of 3.5 moles of copper?

How many grams of silver could be produced by reaction of 10.0 grams copper with 50.0 g silver nitrate?

Which reactant is the limiting reactant?

Thanks in advance!
Btw, please explain this as clearly as possible!

2007-11-15 07:01:28 · 2 answers · asked by Anonymous in Chemistry

If a person was in space and took off his/her space suit, would the person explode or implode?

Let me know your answer and you theory. Please be quick-it's for my students!

Thanks

2007-11-15 06:59:38 · 8 answers · asked by glitterybunnies 2 in Astronomy & Space

I can get some quadratic equations, but i do them a long way. please can you show me how to do it a quick way.

2007-11-15 06:59:13 · 2 answers · asked by <,"(((>< 3 in Mathematics