Science & Mathematics - 29 October 2007

What would be the bond angle for oxygen or O2. How do you get its shape? Also, how do you distinguish between trigonal planars and trigonal pyramidal shapes? I'm bad at this, and don't know how to do all of this?

For example, how do you know what shape Hydrogen Sulfide is, and what its angle will be?

2007-10-29 14:12:45 · 2 answers · asked by Anonymous in Chemistry

By what factor will the kinetic energy change if the speed of the motorcycle is increased to 108 mph?
KEnew=____KEold

2007-10-29 14:12:13 · 1 answers · asked by Anonymous in Chemistry

how do u figure out the equation of the line tangent...do we have to use the chain rule?

1. x= sec^(2)t -1, y= tan t, t= -pi/4

2007-10-29 14:12:05 · 2 answers · asked by Anonymous in Mathematics

2007-10-29 14:10:12 · 3 answers · asked by Madison W 1 in Mathematics

If I told you that it is Boiling Neodynium, atomic number 60, Weight 144.24 would it be so hard to accept. This Hydrogen Theory just doesn't get it.
If neodynium boils at 840 degrees C. there is no known temperture known that accounts for evaporation, or is there?

2007-10-29 14:09:05 · 6 answers · asked by blueridgemotors 6 in Astronomy & Space

i know it ends up being something like
(x-2 ) (x +3 )
but the negatives are throwing me off and i dont know which factor goes in and if is positive or negative

2007-10-29 14:07:45 · 6 answers · asked by . 7 in Mathematics

that last question: directions: determine an equation describing the motion of tides, assuming high tide at t=0.
5) reffering to q.4) how far does the tide in the bay drop 1 hour after high tide?
6)The brightness of the star Delta Caphei varies sinusoidally between values of 4.35 and 3.65. The time between maximum brightness readings is 5.4 days. Determine an equation describing the star's brightness as a function of time, assuming that its brightness at day 0 is 4 and decreasing.

2007-10-29 14:07:39 · 1 answers · asked by dOOmsickle 1 in Mathematics

All over the world, the honey bee population has decreased by as much as 25%. What types of fruit/plants are going to be affected and what other repercussions might come about because of this?

2007-10-29 14:06:30 · 2 answers · asked by Anonymous in Zoology

are on the highway and its a really hot day and you see those wavy waves.. What are those and what are some facts about them?

Cooking on the grill
above a heater
Highway...

2007-10-29 14:05:04 · 9 answers · asked by ♦Its•Possible•But•Not•Logical♦ 3 in Physics

eather the mound builders ananzi or inuit

2007-10-29 14:04:34 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-29 14:04:32 · 1 answers · asked by Anonymous in Mathematics

a open box is to be constructed from a rectangular piece of cardboard which measures 18 inches by 20 inches to make the box a square shaped cut is made at each corner of the rectangle and the sides folded up. Each square cut must be a whole number of inches on each side determine what size cut will result in the box with the greatest volume? explain answer please so i understand!

2007-10-29 14:02:53 · 1 answers · asked by Anonymous in Mathematics

Write the word or phrase that best completes each statement or answers the question.

oh and ^ means the number after it is an exponet K

729s^3+1

2007-10-29 14:02:16 · 2 answers · asked by Anonymous in Mathematics

If, theoretically, a locomotive of 3000 kg is pulling a freight car of 5000 kg, with a coefficient of static friction of 0.8 and an effective coefficient of friction of 0.2 and the entire train (locomotive + car) is accelerating to the right at 0.5 m/s^2, What is the magnitude of the force creating this acceleration? What is the object exerting this force on the train?

2007-10-29 14:02:13 · 1 answers · asked by katie m 1 in Physics

These are some pratice problems out of my book that are similiar to my homework problems online but they dont show work since they are even. Someone mind showing a example, really apperciate it.

How many grams of methane [CH4(g)] must be combusted to heat 1.20 kg of water from 23.0°C to 85.0°C, assuming 1.00E2% efficiency in heat transfer?

And

At one time, a common means of forming small quantities of oxygen gas in the laboratory was to heat KClO3:
2KClO3(s)--->2KCl(s)+3O2(g) H=-89.4kJ

For this reaction, calculate for the formation of the following:

a) 0.805 mol of O2
b)10.85g KCl

And


How many grams of methane [CH4(g)] must be combusted to heat 1.20 kg of water from 23.0°C to 85.0°C, assuming 1.00E2% efficiency in heat transfer?

2007-10-29 14:02:01 · 1 answers · asked by Reviction 1 in Chemistry

can you explain how the processes of sea floor spreading and magnetic reversal produce bands of oceanic crust that have different magnetic polarities?

2007-10-29 14:00:30 · 2 answers · asked by Anonymous in Earth Sciences & Geology

A 2.200 g sample of quinone, C6H4O2, is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/°C. The temperature of the calorimeter increased from 22.54°C to 29.67°C. What is the heat of combustion per gram of quinone?
ANS:____kJ/g

What is the heat of combustion per mole of quinone?
ANS:____kJ/mol

2007-10-29 13:59:44 · 2 answers · asked by Anonymous in Chemistry

Does anything happen if Vinegar touches water or ice?

2007-10-29 13:59:42 · 1 answers · asked by eugene0426 1 in Chemistry

Here it goes: 16x^2-16x+4=0. My first step I did was factor the 4 out of that which is as follows: 4(x^2-4x+1). Is this some sort of linear equation? Cause if it is, how do I solve it? And if it is a linear equation, how do I solve it with an exponent of 2 in it?

Thank you everyone and please explain. I always need a good explaination

2007-10-29 13:58:06 · 6 answers · asked by Luvon 3 in Mathematics

Ahhhhhhhhh I'm stuck at this physics problem! I thought I at least knew tension is 9.8 * 7100 but thats not right! please help, thank u!

A cubic meter of some material has a mass of 7100 kg. The block of material is lowered into a lake by a strong cable until the block is completely submerged. (Free fall diagram can be made).
Find the buoyant force on the block and the tension in the cable (answers in N)

2007-10-29 13:55:27 · 1 answers · asked by Anonymous in Physics

How are islands formed?

2007-10-29 13:55:22 · 4 answers · asked by ANICETA O 1 in Earth Sciences & Geology

2007-10-29 13:55:15 · 1 answers · asked by Anonymous in Mathematics

2007-10-29 13:54:58 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-29 13:51:58 · 1 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-29 13:50:12 · 18 answers · asked by diamondchick 1 in Biology

The nonmetal oxide, CO2, reacts with the metal oxide, CaO, to give CaCO3. would you expect boric oxide to react similarly with CO2?

I wouldnt think so because boron isnt even a metal so it wouldnt be considered a metal oxide....but im hoping theres a better explanation

2007-10-29 13:48:52 · 1 answers · asked by Anonymous in Chemistry

2007-10-29 13:48:35 · 2 answers · asked by Cedric R 1 in Physics

Use shifts and/or reflections to graph each function. Determine the domain, range, and vertical asymptote of each function.

1. f(x) = In (x + 4)

2. f(x) = 2 + In x

3. f(x) = log(x - 4)

Can you help me find the points of these problems so I can write the graph! I just don't know how you find the points in these problems to write graph from!

2007-10-29 13:47:20 · 1 answers · asked by w s 3 in Mathematics

2007-10-29 13:44:47 · 4 answers · asked by Anonymous in Mathematics

The

2007-10-29 13:43:52 · 2 answers · asked by ChiefNickNameadvancer 3 in Zoology