Science & Mathematics - 27 October 2006

Just curious, I've never heard of botany before so I'm just wondering.

2006-10-27 11:37:32 · 13 answers · asked by Kiara 5 in Botany

I would like to know whether the probability of an outlier appearing approaches zero as the number of events considered approaches infinity.

2006-10-27 11:36:15 · 4 answers · asked by Anonymous in Mathematics

Lourdes can trim the hedges around her property in 8 hours using an electric hedge trimmer. Rafael can do the same job in 15 hours using a manual trimmer. How long would it take them to trim the hedges working together?

2006-10-27 11:36:04 · 6 answers · asked by sillyboys_trucksare4girls 2 in Mathematics

2006-10-27 11:35:12 · 20 answers · asked by slashdog2003 3 in Geography

2006-10-27 11:32:19 · 2 answers · asked by bitmuwha 1 in Earth Sciences & Geology

m is cubed only

2006-10-27 11:31:54 · 3 answers · asked by Dave R 1 in Mathematics

2006-10-27 11:25:45 · 1 answers · asked by Linda 1 in Biology

1: In a neutral atom, the number of electrons equals ____________.
ions
protons
neutrons
none of the above


2: A neutral atom that contains 92 protons contains _______ electrons.
92
46
29
none of the above


3: Elements that have 8 electrons in their outer shell are most likely to be ___________.
stable
unstable
both 1 and 2
neither 1 nor 2


4: Isotopes have the same number of electrons but different ________.
protons
neutrons
sizes
none of the above


5: The atomic weight of an atom is equal to the number of protons plus the number of ________.
energies
isotopes
neutrons
none of the above


6: The unit of electricity in an atom is the electric ___________.
charge
magnetism
energies
none of the above


7: An electrically charged atom is called a(n) __________.
proton
neutron
ion
none of the above


8: Atoms that have the same number of protons but different numbers of neutrons are called ____________.
isotopes
similar
neutral
none of the above


9: Elements which have lost an electron are called
protons
ions
neutrons
none of the above


10: What is the charge of an electron?
positive
negative
neutral
none of the above


11: What is the charge of a proton?
positive
negative
neutral
none of the above


12: In an atom, the protons and neutrons are found ___________.
in the nucleus of the atom
in the atom's outer shell
both 1 and 2
none of the above


13: In an atom, the electrons are found in __________.
nucleus
the atom's electron shells
both of the above
none of the above


14: The Electron Theory was developed by ____________.
Albert Einstein
John Dalton
Aristotle
none of the above


15: What is the process of oxidation?
The electron jumps to another electron shell.
The atom gains an electron.
The atom loses or gives up an electron to another atom.
none of the above


16: In chemistry we often read the periodic table. What is a vertical column called?
a period
a group
both 1 and 2
none of the above


17: When reading the periodic table, a horizontal row of elements is called ____________.
a period
a group
both 1 and 2
none of the above


18: Generally speaking, how would you describe the chemical activity of a group of elements as you go down a column in the periodic table?
The chemical activity among the elements in the vertical row increases.
The chemical activity among the elements in the vertical row decreases.
remains about the same
none of the above


19: During chemical changes the number of neutrons in the nucleus of atoms______.
increases
decreases
remains the same
none of the above


20: What is a chemical reaction?
It depends on the number of neutrons.
It depends on the number of protons.
It's hard to tell.
Atoms of the same or different elements either share electrons, gain, or lose electrons.

2006-10-27 11:25:40 · 6 answers · asked by Anonymous in Chemistry

2006-10-27 11:18:05 · 17 answers · asked by csnape2003 3 in Astronomy & Space

2006-10-27 11:17:46 · 17 answers · asked by dunfie 2 in Medicine

1: In 1803 a famous version of the atomic theory was announced by
Dalton
Moseley
Priestly
Rutherford


2: The molecular weight of Mg3(PO4)2 is
189
262
354
448


3: The number of atoms represented by the formula (NH4)2Cr2O7 is
11
18
19
23


4: The symbol for antimony is
A
Sb
Sc
Se


5: The formula Cl2 represents one
atom
ion
molecule
radical


6: A substance having a molecular (formula) weight of 58 is
CaSO4
HCl
KNO3
Mg(OH)2


7: The number of atoms in the ozone molecule is
one
two
three
four


8: The total number of atoms of carbon in the formula K3Fe(CN)6 is
one
six
three
twelve


9: The smallest part of an element taking part in a chemical change is a(n)
molecule
atom
compound
mixture


10: The weight of one atom of oxygen is known as the
atomic weight
valence
charge
combining power


11: The sum of the weights of the atoms of a compound is known as the compound's
valence
combining power
molecule
molecular weight


12: The one or two letters used to represent an atom of an element are called a(n)
atom
symbol
molecule
compound


13: A group of symbols representing one molecule of a substance is called a(n)
atom
formula
equation
subscript


14: Two atoms joined together as in H2 make up a(n)
monatomic molecule
diatomic molecule
equation
none of the above


15: Numbers placed before a formula to represent more than one molecule of a substance are called
subscripts
coefficients
constants
remainder

2006-10-27 11:15:26 · 3 answers · asked by Anonymous in Chemistry

A normal distribution has a mean of 6.8 and a variance of 1.6. Determine the value below which 95% of the data lies.

The answer is 8.88077..why??

2006-10-27 11:15:09 · 1 answers · asked by fuilui213 6 in Mathematics

Yes, it's a geeky physics joke...

2006-10-27 11:14:49 · 13 answers · asked by Anonymous in Physics

supposing the escalator itself didn't stop.

2006-10-27 11:09:38 · 10 answers · asked by eprefugee 3 in Physics

I am having a hard time understanding how to do this...can someone help me please im trying to figure out how to use the distributive property while multiplying polynomials...can anyone explain it to me please....
Thanks.

2006-10-27 11:08:45 · 6 answers · asked by desibear 1 in Mathematics

2006-10-27 11:07:43 · 8 answers · asked by filotofo 1 in Physics

2006-10-27 11:07:34 · 6 answers · asked by for a pound 1 in Engineering

2006-10-27 11:06:02 · 14 answers · asked by Anonymous in Biology

thanks.

2006-10-27 11:04:24 · 14 answers · asked by karrie 1 in Mathematics

2006-10-27 11:03:38 · 24 answers · asked by olivia c 1 in Mathematics

poop the stuff that comes out of ur butt

2006-10-27 11:02:57 · 8 answers · asked by Janell A 1 in Biology

Just curious.

2006-10-27 11:00:51 · 7 answers · asked by Calvin James Hammer 6 in Astronomy & Space

If the outer, ...outer space is said to be nothing, then what really is 'nothingness'?

2006-10-27 10:56:31 · 13 answers · asked by Anonymous in Astronomy & Space

where can i find a detailed diagram of the mains power from my house to determine which substation it connects to?

2006-10-27 10:55:25 · 6 answers · asked by csnape2003 3 in Engineering

Give me a break, guys, Im having problems w/ the site...give me some credit...here's question 1 until I have time to type the rest....

1. Which evolved first,

a. The dugestive system, the food to be digested, the appetite, the ability to eat and find food, the digestive juices, or the body's resistance to it's own digestive juice (stomach, intestines, etc..)?

2006-10-27 10:54:41 · 9 answers · asked by candi k 2 in Biology

OUT OF THESE
last for a much longer time
last for a much shorter time
last about the same time
can be seen from larger areas of Earth

2006-10-27 10:51:59 · 6 answers · asked by Anonymous in Astronomy & Space

I Solid
II Liquid
III Gas

A. I only
B. II only
C. III only
D. I and II only

2006-10-27 10:47:41 · 9 answers · asked by Ashley C 1 in Chemistry

For a daily lottery, a person selects a three-digit number. If the person plays for $1, she can win $556. If a person boxes a number, she will win $62. Find the expectation if the number 298 is played for $1 and boxed. (When a number is "boxed" it can win when the digits occur in any order.) Round your final answer to two decimal places.

2006-10-27 10:47:10 · 2 answers · asked by SALVE_1 1 in Mathematics

2006-10-27 10:44:14 · 5 answers · asked by Anonymous in Astronomy & Space

2006-10-27 10:41:49 · 5 answers · asked by Anonymous in Chemistry