Science & Mathematics - 27 December 2007

A) Combustion Reaction
B) Single- Replacement Reaction
C) Combination Reaction
D) Decompisition Reaction



Note: the ^ in the equation is an up arrow.

2007-12-27 13:54:55 · 4 answers · asked by Anonymous in Chemistry

I was just taking a shower and all of a sudden i looked down and i noticed about 4 cuts on my inner thy (srry if spelt wrong!!) that wernt there before!!! then as i am looking and trying to think what they were i witnessed 3 others in a nail like form just appear! out of nowhere! thats when i started to freak and i hurried up and shampooed my hair then dryed my eyes of with the towel on the outside of the door, i pulled my head in and shut the door, i then turned around to put the shampoo back on the shelf and i turned around and the shower door was open again!!!!! ANY IDEAS WOULD BE HELPFUL!!!!!

2007-12-27 13:50:41 · 16 answers · asked by rickferris1 2 in Paranormal Phenomena

A) Combustion Reaction
B) Single- Replacement Reaction
C) Combination Reaction
D) Decompisition Reaction

2007-12-27 13:48:24 · 3 answers · asked by Anonymous in Chemistry

solve the equation.
sec^2x-secx-2=0

so HARD!

2007-12-27 13:48:14 · 9 answers · asked by green 3 in Mathematics

A) Product
B) Reactant
C) Catalyst
D) Solid
E) Gas


Please help me out. thank you soo much

2007-12-27 13:45:50 · 5 answers · asked by Anonymous in Chemistry

Click on the link and there is a picture and a measurement. Please answer to best ability, THANKS!


http://www.abcdistributing.com/home/catalog/cat_item_pg.asp?G=347&P=399

2007-12-27 13:44:40 · 6 answers · asked by Anonymous in Mathematics

A) The ways in which atoms are joined together are changed.
B) New atoms are formed as products.
C) The starting materials are named reactants.
D) The bonds of the reactants are broken and new bonds of the products are formed.
E) In a word equation representing a chemical reaction, the reactants are written on the left and the products on the right

2007-12-27 13:43:28 · 3 answers · asked by Anonymous in Chemistry

1: When sulfur dioxide decolorizes KMnO4, a product is MnS04. The valence of manganese changed from
+7 to +2
+6 to +4
+5 to +2
+4 to +2


2: The valence of Ti in TiO2 is
1
2
3
4


3: The formula for ferric sulfate is
FeSO4
Fe2SO4
Fe2(SO4)2
Fe2(SO4)3


4: One molecule of hydrogen is represented by the expression
H2
2H
2H+
2H-


5: The formula for nitrogen pentoxide is
NO2
N2O
N2O3
N2O5


6: The formula of sodium sulfite is
Na2S
Na2SO2
Na2SO3
Na2SO4


7: If the valence of element X is +2 and the valence of element Y is -3, the formula of the product when combined is
XY
X2Y3
X3Y2
X6Y6


8: The valence of sulfur in H2SO4 is
-6
-3
6
8


9: The formula for potassium sulfide is
K2S
KHSO3
K2SO3
K2SO4


10: The symbol for the element copper is
Co
C
Cr
Cu


11: The formula that shows chlorine with a valence of 7 is
HCl
HClO2
HClO3
HClO4


12: In K2CrO4, the valence number of Cr is
6
2
8
4


13: The symbol for lead is
P
Pb
Po
Pt


14: The symbol for silicon is
S
Sc
Si
Sn


15: The valence of the phosphorus in Na3PO4 is
-1
2
-3
5


16: The valence of aluminum is +3. The formula of aluminum sulfate is
Al2S3
AlSO4
Al2(SO4)3
Al2SO4


17: The number of electrons lost or gained in the outermost orbit of an atom is the atom's
atomic weight
atomic number
valence
molecular weight


18: The only common radical which has a positive valence is
SO4
NO3
NH4
CrO4


19: In the compound KClO3 the total negative valence is
-2
-4
-3
-6


20: What is the symbol for the element aluminum?
Ag
At
Al
Ar

2007-12-27 13:42:39 · 3 answers · asked by Ashley G 1 in Chemistry

Freeze dry liquid to be rehydrated at a later date.

2007-12-27 13:41:33 · 5 answers · asked by theresa o 1 in Other - Science

At the speed of light Time stops ( dillate at its maximum rate ),but why is it when we are not moving Time doesnt move at it´s maximum rate ( we still `feel´ 1 sec as just a tick on our wristwatch)? Which books shall i refer to for this kind of questions?..since i doubt somebody can answer this..

2007-12-27 13:40:59 · 6 answers · asked by Prinsipia physica 2 in Physics

Everyone, What:

COUNTRY:
CITY:
TIME:

You are in and what time??

2007-12-27 13:40:06 · 12 answers · asked by Anonymous in Geography

Macroevolution was influenced significantly by continental drift. Place the following three events in their correct order.

I. formation of Laurasia and Godwana
II. formation of Pangea
III. formation Asia, Africa, North and South America, Australia, Europe, and Antarctica

A. I, II, III

B.II, I, III

C. III, II, I

D. I, III, II

E. II. III, I

2007-12-27 13:38:44 · 6 answers · asked by Anonymous in Biology

2007-12-27 13:35:42 · 13 answers · asked by Arienna C 1 in Physics

I'm confused

2007-12-27 13:35:35 · 11 answers · asked by Anonymous in Mathematics

When the equation, Fe + Cl2 --> FeCl3 is balanced, what is the coefficient for Cl2?


PLease HelP

2007-12-27 13:33:19 · 6 answers · asked by Anonymous in Chemistry

Given the function f defined by f(x) = cosx -cos^2 x for [-pi,pi]

a) find the x intercepts
b) find the x and y coordinates of all relative max. points of f & justify your answer
c) find the intervals on which the graph is increasing

2007-12-27 13:31:04 · 3 answers · asked by Anonymous in Mathematics

And have it laugh at you and run away when you put the gun away?

Am I a good chicken farmer?

2007-12-27 13:30:11 · 11 answers · asked by Bill W 【ツ】 6 in Agriculture

2007-12-27 13:26:00 · 6 answers · asked by Anonymous in Weather

Phylogenetic trees are representations of the evolutionary histories of organisms. Which of the following statement(s) concerning phylogenetic trees is/are incorrect?

A.Phylogenetic trees are also used to identify organisms.

B.Comparing nucleic acids from various organisms is one method used to build a phylogenetic tree.

C.Utilize homologies in their construction.

D.Comparing physical appearance is one method used to build a phylogenetic tree.

2007-12-27 13:24:51 · 1 answers · asked by Anonymous in Botany

2007-12-27 13:20:03 · 6 answers · asked by Darwin H 1 in Biology

Is CF3Cl polar? and what is its lewis structure? Because my teacher said any geometry with lone pair electrons on the center are polar. Except linear, square planer which are non polar. But isn't tetrahedral symmetrical and non polar also?

2007-12-27 13:19:48 · 3 answers · asked by Anonymous in Chemistry

1: Write in interval notation: x > 3 AND x ≤ 7
(-∞, 7)
(3, 7]
(-∞, ∞)
(3, ∞)


2: Write in interval notation: 4 > x OR 3 > x
(3, 4)
(-∞, 3)
(-∞, 4)
(-∞, ∞)


3: Write in interval notation: x ≤ -3 AND x > -10
(-10, -3]
(-∞, -3]
[-10, -3)
(-∞, ∞)


4: Write in interval notation: x > 2 OR 5 > x
(2, 5)
(-∞, ∞)
(-∞, 5)
(2, ∞)


5: Write in interval notation: x > 2 AND 5 > x
(2, 5)
(-∞, ∞)
(-∞, 5)
(2, ∞)


6: Write in interval notation: x > 2 OR 5 < x
(2, 5)
(-∞, ∞)
(-∞, 5)
(2, ∞)


7: Solve and write in interval notation: x − 3 > 8 AND x + 2 > 4
(-∞, ∞)
(2, ∞)
(2, 11)
(11, ∞)


8: Solve and write in interval notation: 7 ≥ x + 4 OR x − 3 < 2
(-∞, 5)
(-∞, ∞)
[3, 5)
(3, ∞)


9: Solve and write in interval notation: x / 2 ≤ -3 AND x − 5 < 2
(-∞, -3/2)
(-∞, -6]
(-∞, 7)
(-∞, ∞)


10: Solve and write in interval notation: -3 ≤ (x + 4) / 3 < -1
(-∞, ∞)
(-13, ∞)
[-13, -7)
[-13, -5)

2007-12-27 13:18:37 · 4 answers · asked by Ashley G 1 in Mathematics

I'm all for animal sanctuaries, but have them closed to the public.

Thoughts?

2007-12-27 13:16:22 · 18 answers · asked by Anonymous in Zoology

say i shot a beam of laser at the north pole. It is directed at Amazon jungle, There´s a Mirror that should deflect the beam to a new direction and that is japan.In japan there´s a similar mirror that should deflect the laser back at me. Say we abandon everything that can interfere with the course of the laser such as Mountains,trees etc etc..Will it forms a triangle (with 180° as the sum of every inside edges) or will the light travels straight to the Horizon then outer space..

2007-12-27 13:16:03 · 3 answers · asked by Prinsipia physica 2 in Physics

i really need your help ASAP! and advance thanyou!

2007-12-27 13:14:34 · 5 answers · asked by Anonymous in Chemistry

Provide a coefficient matrix corresponding to the system of linear equations.

2007-12-27 13:13:56 · 2 answers · asked by samoht 1 in Mathematics

Island biogeography have shown that the number of species that colonize newly formed islands from surrounding areas is dependent upon which of the following factors?

A. Size of the island.

B.Distance of the island from the mainland (source of the colonizing species).

C. Time.

D.All three of these factors influence the colonization of islands.

E.Choices 1 and 2 are true, but Choice 3 is not.

2007-12-27 13:13:44 · 3 answers · asked by Anonymous in Biology

1: The equation 92U238 + 0n1 --> 92U239 represents
an electronic reaction
a molecular reaction
a nuclear reaction
an oxidation reaction


2: In the hydrogen bomb the fusion of hydrogen isotopes results in the production of
barium
helium
plutonium
proton


3: The atom whose nucleus contains the largest number of neutrons is
92U235
92U239
93Np239
94Pu239


4: Neutrons are best absorbed in an atomic pile by rods of
cadmium
calcium
copper
zinc


5: A man-made element is
gold
plutonium
sodium
zinc


6: Radioactive changes differ from ordinary chemical changes because radioactive changes
are explosive
absorb energy
involve changes in the nucleus
release energy


7: Two man-made elements with atomic numbers greater than 92 are
americium and curium
thorium and actinium
U238 and U239
U235 and U238


8: Isotopes of uranium have different
atomic numbers
atomic weights
numbers of planetary electrons
numbers of protons


9: The Law of Conservation of Mass-Energy states that matter may be converted into __________.
atomic charge
energy
mass
liquid


10: In reactions involving atomic energy changes take place in the _______ of an atom.
proton
valence shell
neutron
nucleus


11: A substance which slows down neutrons so that they may be captured in an atomic pile is known as the __________.
moderator
graphite
slowing rod
inhibitor


12: The rate at which an atomic pile operates is controlled by rods of ______________ or boron steel.
aluminum
boron aluminum
zinc
cadmium


13: As radium is disintegrated, its half-life ____________.
increases
decreases
remains the same
none of the above


14: When a radioactive element undergoes beta disintegration, the atomic number of the nucleus
increases
decreases
remains the same
none of the above


15: As the number of neutrons emitted during a fission reaction increases, the intensity of the fission process __________.
increases
decreases
remains the same
none of the above


16: When a radioactive element undergoes an alpha disintegration, both the atomic weight and the atomic number of the daughter nucleus ___________.
increases
decreases
remains the same
none of the above


17: As bismuth 210 emits electrons, the mass of the daughter nuclei formed ____________.
increases
decreases
remains the same
none of the above


18: When uranium 238 changes into plutonium in an atomic reactor, the number of neutrons in atomic nuclei _____________.
increases
decreases
remains the same
none of the above


19: During fission of uranium 235 in an atomic bomb, the number of neutrons ______________.
increases
decreases
remains the same
Answer 4


20: As fusion occurs in the sun, the number of atoms of helium in the sun _______________.
increases
decreases
remains the same
none of the above

2007-12-27 13:12:55 · 5 answers · asked by Ashley G 1 in Chemistry

why would spraying insect posion would affect the animals as well other than insects even if the sprays did directly harm only the insects.

2007-12-27 13:11:21 · 4 answers · asked by mormar 1 in Biology

3x^2 - 34x - 24 = 0

2007-12-27 13:09:58 · 6 answers · asked by LaLaLa :) 2 in Mathematics