Science & Mathematics - 6 December 2007

2007-12-06 01:40:24 · 6 answers · asked by Gator Girl 5 in Chemistry

2007-12-06 01:38:31 · 15 answers · asked by btbbt0987 1 in Earth Sciences & Geology

I know it has to do with temperature differences, the pond water being hotter than the ambient air. But surely the water molecules are not heated enough to vaporize and become steam?

2007-12-06 01:38:16 · 5 answers · asked by sdadesky 1 in Weather

Categorize each of the follwoing as an element compound, mixture, or pure substance
-popsicle
-sugar
-dishwater

If u have a container with hydrogen gas and oxygen gas in it do u have water? why or why not?


give an example of element, compound, a mixture


MUCHO MUCHO MUCHO THANK YOUS
IF U CAN HELP ME =]]

2007-12-06 01:36:21 · 4 answers · asked by Anonymous in Chemistry

2007-12-06 01:35:33 · 5 answers · asked by btbbt0987 1 in Earth Sciences & Geology

2007-12-06 01:34:36 · 5 answers · asked by jokersrage2 1 in Mathematics

what are the chemicals or substances that fermentation tests??

2007-12-06 01:34:34 · 2 answers · asked by khaye 1 in Chemistry

when we see in mirror why we see our left and right hand opposite to that it is,why we not see our vertical inversion,as head down and legs up???

2007-12-06 01:31:02 · 3 answers · asked by bittu m 1 in Physics

A mixture of contain 76.5% NaCl , 6.5% MgCl2 , and 17.0% Na2S04 by mass. What is morality of Cl- ions in a solution formed by dissolving 7.50g of mixture in enough water to form 500.0ml of solution

2007-12-06 01:30:56 · 2 answers · asked by Anonymous in Chemistry

Define an operon (what it is, where it is found), and tell me the
critical difference between the trp operon and the lac operon. How does
each one work? Why is the trp operon repressed when tryptophan is
present, while the lac operon is not repressed in the presence of
lactose?

2007-12-06 01:28:28 · 4 answers · asked by Jennifer R 1 in Biology

My buddy stumped me w/ this question and I have no clue ^_^

2007-12-06 01:28:19 · 7 answers · asked by Anonymous in Zoology

I know that there are cells, tissues, organs, but where do the following fit in?

Proteins:

Enzymes:

Minerals:

Blood:

Vitamins:

Hormones:

Thanks

2007-12-06 01:26:47 · 3 answers · asked by Milo B 1 in Biology

I'm teaching my son biology and want to confirm the order of life. Is the order and desc correct?

Quark: Simply energy. Can’t be seen under any microscope.

Atom: Made from quarks. Has protons, neutrons. These make molecules.

Molecule: These are made from Atoms. Examples of molecules are: Hydrogen, Oxygen.

Organelle: Made of molecules and are the small organs in each cell. Examples in aminal cells are: Neucleus, Ribosome, Lysosome.

Cell: Made up of organelles. Cells are the building blocks of life.

Tissue: Made from similar cells. Each organ has specific types of cells that make that particular organ and its parts.

Organ: Similar types of tissue (example muscle tissue, heart tissue) makeup an organ.

Organ System: Organs that work together to help an organism execute a specific function (breathing, thinking, etc) are part of an organ system.

Organism: An organism is the person/thing.

2007-12-06 01:25:13 · 6 answers · asked by Milo B 1 in Biology

It is believed to be at an altitude of about 200 miles, but when first seen by an observer,, how far away over a particular spot on earth would it be passing over away from the observer. If seen lets say from LA would it be over SF ?

2007-12-06 01:23:30 · 1 answers · asked by scramo 1 in Astronomy & Space

A mixture of gases contains 0.75 mol N2, 0.30 mol O2, and 0.15 mol CO2. If the total pressure of the mixture is 1.56 atm, what is the partial pressure of each component?

2007-12-06 01:16:22 · 4 answers · asked by Anonymous in Chemistry

a. Electrons are either shared or transferred between atoms.
b. Electrons are shared but not transferred between atoms.
c. Electrons are neither shared nor transferred between atoms.
d. Electrons are transferred but not shared between atoms

2007-12-06 01:16:08 · 3 answers · asked by Anonymous in Chemistry

2007-12-06 01:15:12 · 4 answers · asked by Anonymous in Mathematics

A- 20
B- 32
C- 12

2007-12-06 01:08:42 · 5 answers · asked by hitman812001 1 in Engineering

Is there any specifications specifying the maximum content of various metals in the sand used for cement concrete ?

2007-12-06 01:07:24 · 1 answers · asked by travelpa 7 in Engineering

2007-12-06 01:06:29 · 3 answers · asked by moose man 2 in Biology

The normal respiratory rate for a human being is 15.0 breaths per minute. The average volume of air for each breath is 505 cm3 at 20degreesC and 9.95 x 10^4 Pa. What is the volumne of air at STP that an individual breathes in one day? Need answer in cubic meters....

2007-12-06 01:05:14 · 1 answers · asked by Anonymous in Chemistry

2007-12-06 01:02:23 · 5 answers · asked by Kirell G 1 in Biology

Lead pellets, each of mass 2.00 g, are heated to 200°C. How many pellets must be added to 450 g of water that is initially at 20.0°C to make the equilibrium temperature 25.0°C? Neglect any energy transfer to or from the container.

2007-12-06 01:01:05 · 4 answers · asked by swimchic632 2 in Physics

A sample of oxygen at 40degreesC occupies 820. mL. If this sample later occupies 1250 mL at 60degreesC and 1.40 atm, what was its original pressure?

2007-12-06 01:00:22 · 1 answers · asked by Anonymous in Chemistry

What would happen to the earth if an object 10000000000000000 bigger than our sun hit the earth. I mean what would happen to our planet

2007-12-06 00:51:49 · 8 answers · asked by Anonymous in Astronomy & Space

a. Helium does not react with other substances but does form new substances.
b. Helium reacts with other substances but does not form new substances.
c. Helium reacts with other substances to form new substances.
d. Helium does not react with other substances to form new substances

2007-12-06 00:49:54 · 2 answers · asked by Anonymous in Chemistry

2007-12-06 00:48:46 · 6 answers · asked by Anonymous in Engineering

2007-12-06 00:47:12 · 1 answers · asked by renedelgado39 1 in Physics

Why is it that some people like in this forum, ask a question, and say that they will award 10 points to the best answer, but when it comes down to it, they aren't going to pick a best answer, rather they are going to let it go to a vote. Take M G for example, she's been promising 10 points on each question for months, but never actually picks a best answer.

2007-12-06 00:46:53 · 3 answers · asked by Jeƒƒ Lebowski 6 in Mathematics

A flask containing 155 cm3 of hydrogen was collected unser a pressure of 22.5 kPa. What pressure would have been required for the volumne of gas to have been 90.0 cm3, assuming the same temperature.

2007-12-06 00:45:55 · 2 answers · asked by Anonymous in Chemistry