Homework Help - September 2006

In a hypothetical universe, an oil-drop experiment gave the following measurements of charges on oil drops: -3.48×10-19 C, -4.64×10-19 C, -8.12×10-19 C, and -9.28×10-19 C. Assume that the smallest difference in charge equals the unit of negative charge in this universe. What is the value of this unit of charge?

2006-09-21 10:08:49 · 1 answers · asked by Anonymous

Please i really need one!!!!!!!

2006-09-21 10:05:20 · 12 answers · asked by Teresa S 1

2006-09-21 10:02:52 · 12 answers · asked by morgan c 2

I am reading the book bridge to terabithia and we have to do a paer on it does anyone know what was happening in the us in the late 1960's and early-mid 70's

2006-09-21 09:56:46 · 8 answers · asked by Anonymous

it seems like theres always something better to do than my homework so I never get it done...HELP!!!

2006-09-21 09:55:20 · 5 answers · asked by Bob 2

i need to know how many acres the whole state of Ohio is, please help!

2006-09-21 09:53:10 · 5 answers · asked by cutie123 3

i have been haveing a really hard time with my homework. it is not because it is hard homework it is the matter of foucus. please give me some advice.

2006-09-21 09:53:09 · 10 answers · asked by Anonymous

an equation with one or more variables - begins with o, 12 letters
writing units of each variable in a real-life problem - 12 letters
numbers and/or variables combined with mathematical symbols - 10 letters
collection of all output values - 5 letters
collection of all input values - 6 letters, 2nd letter is o, last letter is n
a relationship between input and output - 8 letters, second to last letter o

thanks

2006-09-21 09:49:31 · 2 answers · asked by ♥ £.O.V.€. ♥ 3

its for a picture project

2006-09-21 09:43:27 · 13 answers · asked by Anonymous

2006-09-21 09:42:08 · 4 answers · asked by js_batres 2

what does this mean:
?Que tiene que hacer para conocer la diferencia de Limba?

(Limba is a soap brand)

2006-09-21 09:39:37 · 4 answers · asked by Lina 4

For this question...I need those who can speak spanish well...all I need you to do is see if my statements are gramatically correct and make sense. In class, I had to write questions and answers. Here they are:
1) Devolviste los libros?
-Si, fui a la biblioteca ayer.
2) Compraste la pasta dental?
-Si, fyi a la farmacia esta manana.
3) Enviaste las cartas?
-Si, fui al correo esta manana.
4) Fuiste al consultorio del dentista?
-Si, fui esta manana.
5) Fuiste a la tienda de equipo deportivo?
-Si, fui esta manana.
6) Lleno el tanque con gasonlina en la estacion de servicio?
-Si, llene el tanque con gasolina anoche.
7) Compraste el platano en el supermercado?
-Si, ayer!

2006-09-21 09:38:07 · 3 answers · asked by Lina 4

2006-09-21 09:34:06 · 9 answers · asked by Anonymous

I WILL GIVE IN RETURN SOME FREE POINTS *IF I LIKES THE TOPIC =) SURPRISE ME!!!!

2006-09-21 09:33:58 · 6 answers · asked by Lizzie101 2

2006-09-21 09:20:44 · 4 answers · asked by jonnybigboi06 1

2006-09-21 09:12:38 · 14 answers · asked by caleb m 1

2006-09-21 09:12:12 · 4 answers · asked by caleb m 1

I have to give one next week in class. It can be about anything, good, bad, sex whatever. I would just like to have a couple to choose from that are interesting.

2006-09-21 09:12:03 · 5 answers · asked by animalcrackers31 2

2006-09-21 09:08:36 · 2 answers · asked by Soccer_Fan_1111 1

2006-09-21 09:04:08 · 2 answers · asked by kalie w 1

When both7 and 3 are taken away from a number, the result is 31. What is the number?

2006-09-21 09:00:05 · 17 answers · asked by k t 1

correctional system

2006-09-21 08:58:39 · 5 answers · asked by MONCHITO 1

for social studies class we picked a leader for a certain time period, i picked thomas jefferson. we have to draw a picture of something that relates to the leader. i dont know what to do draw for thomas jefferson. what should i do? thanks for your answers!

2006-09-21 08:58:21 · 6 answers · asked by ? 3

2006-09-21 08:41:25 · 8 answers · asked by Jia 1

For a project for school, we're supposed to choose a historical fiction book for the 9th or 10th grade reading level and do a report on it. Does anyone have any recommendations? Thanks! (please include book title, author, and a brief summary. thanks again!)

2006-09-21 08:26:19 · 10 answers · asked by Alyssy 2

A REAL LIFE DETECTIVE STORY

2006-09-21 08:23:04 · 4 answers · asked by lion_sun93 1

The * denotes the ones that I think are right.
1. The number of significant figures in the volume measured as 2.32 ml is
a.1.
b.2.
*c.3.
d.4.
e.5.

2. Liquid hydrogen boils at –253°C. What is its boiling point on the Kelvin scale?
*a.20.K
b.30. K
c.126 K
d.426 K
e.526 K

3. A 5.00 x 102 g sample of ethyleneglycol has a density of 1.114 g/cm3. Calculate
its volume.
a.0.00223 cm3
b.7.24 cm3
c.8.98 cm3
*d.449 cm3
e.557 cm3

4. All of the following statements are correct EXCEPT
a.The conversion of compounds into elements is a chemical change.
b.The conversion of sugar to carbon and water is a chemical change.
c.The conversion of elements into compounds is a chemical change.
*d.The conversion of liquid water to gaseous water is a chemical change.
e.The evaporation of water is a physical change.

5. How many neutrons are there in the chloride ion, Cl-?
a.17
b.18
*c.20
d.21
e.38


6. What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite, K2(UO2)3(VO4)2 • 3H2O?
a.8:3
b.8:6
c.9:6
d.17:3
*e.17:6

7. The formula for potassium carbonate is
a.P2CO3.
*b.K2CO3.
c.Po2CO3.
d.P2C.
e.K2C.

8. The complete combustion of pentane, C5H12, which is a volatile hydrocarbon, yields carbon dioxide and water:
__ C5H12 + __ O2 __ CO2 + __ H2O
The coefficient of oxygen in the balanced equation is
*a.8.
b.9.
c.11.
d.13.
e.15.

9. What is the molar mass of ammonium sulfate, (NH4)2SO4, an important synthetic
fertilizer?
a.70. g/mol
b. 92 g/mol
c.114 g/mol
*d.132 g/mol
e.146 g/mol

10. What is the percentage of nitrogen in ammonium phosphate, (NH4)3PO4?
a.11.6%
b.16.0%
*c.28.2%
d.31.9%
e.34.3%




11. Analysis of a hydrocarbon showed that it contained 14.4% hydrogen and 85.6% carbon by weight. What is its simplest formula?
a.CH
*b.CH2
c.CH3
d.C2H3
e.C2H5

12. Balance the following expression:
__ CH3CH2COOH + __ O3 __ CO2 + __ H2O
How many moles of ozone, O3, are required for the complete combustion of 3 moles of propanoic acid?
a.2
b.3
c.6
*d.7
e.9

13. The species that is formed when a molecule gains an electron is called
*a.an anion.
b.a cation.
c.an isotope.
d.a charge mass ratio.
e.an isomer.

14. What is the percentage of copper in copper(I) sulfide, Cu2S?
a.20.1
b.33.5
c.46.5
*d.79.9
e.84.3

15. There are three isotopes of carbon differing with respect to
*a.neutrons.
b.atomic number.
c.nuclear charge.
d.electron configuration.
e.number of protons.

16. The heat of combustion of benzoic acid is –26.4 kJ/g. What is the heat of combustion expressed in joules per gram?
a.–2.64 x 101 J/kg
b.–2.64 x 103 J/kg
*c.–2.64 x 104 J/kg
d.–2.64 x 107 J/kg
e.–2.64 x 1010 J/kg
17. The formula for the chloride ion is
*a.Cl-.
b.ClO-.
c.ClO3-.
d.ClO4-.
e.HClO4.

18. The group(s) that readily form anions is (are) the
1.alkali elements.
2.halogen elements.
3.transition elements.
a.1 only
*b.2 only
c.3 only
d.1 and 2 only
e.1 and 3 only

19. Which one of the following equations is properly balanced?
a.NH4NO3 2H2O + N2
*b.2CH3CHO + 5O2 4CO2 + 4H2O
c.Sn + 4HNO3 SnO2 + 2NO2 + 2H2O
d.2Na2SO4 + 3Bi(NO3)3 Bi2(SO4)3 + 9NaNO3
e.Na2CO3 + 2H2SO4 Na2SO4 + 2H2O + CO2

20. A given hydrocarbon is converted completely to carbon dioxide and water, and equal numbers of moles of CO2 and H2O are produced. The hydrocarbon could be
a.CH4.
b.C2H6.
c.C3H8.
d.C3H4.
*e.C4H8.

2006-09-21 08:22:33 · 1 answers · asked by ls1gun 1

For example they gave me a trapezoid and the upper left side is x+40 and the bottom left side is x. I need to find the measures. If anyone knows about angles or more specifically transversal lines, alternate interior lines, same sided interior angles, and corresponding angles. please write back. oh and leave your e-mail just in case i didnt get something. thanks

2006-09-21 08:17:33 · 1 answers · asked by Anonymous

2006-09-21 08:10:54 · 3 answers · asked by yourlildevil89 1

Sorry, i already did the nmon verbal I actually was stuck on the verbal. I mean I know you can yeoo or whatever,. I just can't think of examples of ways to verbally communicate in a tense situation and a relaxed situation???

2006-09-21 08:06:47 · 3 answers · asked by Anonymous