Chemistry - May 2007

The stated capacity of a railroad tank car designed to carry liquified petroleum gas (LPG) is 280,000 gallons of water. If the densities of water and LPG are 1.00 g/mL and 0.537 g/mL respectively, how many pounds of LPG can the car carry?


Provide the correct answer in scientific notation with the correct number of sig figs. You must use the following conversion factors: 1 L = 1000 mL; 1 L = 1.057 quarts; 1 gallon = 4 quarts; 1 g = 0.03527 oz; 1 lb = 16 oz

2007-05-21 13:39:36 · 4 answers · asked by Anonymous

one of the mineral is chalococite (CuFeS2) and can be changed into native copper (Cu). However, it takes a lot of oxygen gas, calculate the volume of oxygen gas at 1 atmosphere pressure necessary to convert 1 ton of ore containing 1.25% Cu in the form of chalococite (CuFeS2) to native copper. This part of the extraction is done at 400 degree Celcius.

(Greatly appreciated if you could tell me the steps you took)

2007-05-21 13:37:54 · 1 answers · asked by ?-? 1

Sorry...but I just caaaaaaan't find the answer..I tried to read wikipedia, the video that was supposed to help us answer this question didn't help at all..since we didn't get to finish it...Science..is not my best subject

2007-05-21 12:47:28 · 1 answers · asked by vexen431 4

Fe(s) + H2SO4(aq)----> FeSO4(aq) + H2(g)

(a) How many liters of hydrogen measured at STP can be produced?
(b) Calculate the number of moles of excess reagent remaining at the end of the reaction.

2007-05-21 11:53:07 · 1 answers · asked by bibbitybobbyboo22 2

I have a unknown sample of a metal and I have to identify its identity through precipitation. Anyone have any idea how this is done?

2007-05-21 11:16:39 · 1 answers · asked by Jim 1

[H+] is 2.51E-3 in a 0.35 M solution of acetic acid (CH3COOH). What is the Ka?

please show your steps, or explain to me how you did it

thanks!!

2007-05-21 11:10:02 · 2 answers · asked by blackcat3556 4

A- it is not composed of elements.
B- the hydrogen and oxygen don't completely join
C-it occurs naturally on earth in a solid, liquid, and gaseous state
D-it flows when it is a liquid but not when it is a gas

2007-05-21 10:49:09 · 7 answers · asked by L1l_ H3aRtz 1

pH of natural rainfall = 5.5
pH of pure water = 7.0

2007-05-21 10:45:30 · 3 answers · asked by soccrrulz21 2

2007-05-21 10:43:48 · 1 answers · asked by soccrrulz21 2

Krypton-81m is inhaled during studies to measure lung ventilation. Its half-life is only 13 seconds. How much time has passed before a sample of krypton-81m with an original activity of 260 decays per minute has decreased to an activity of 8 decays per minute?

2007-05-21 10:41:13 · 3 answers · asked by soccrrulz21 2

A-they are gases at room temerature.
B-they are the main elements found in natural substances and living things.
C-they are the only elements that make up living cells
D-they are the main elements that make up both air and water

2007-05-21 10:38:29 · 21 answers · asked by L1l_ H3aRtz 1

2007-05-21 10:38:00 · 2 answers · asked by giterdone620 1

so if I mix lemon juice Acid 2 on ph scale and windex a 12 ion the ph scale what would happen my mom won't let me try it

2007-05-21 10:29:13 · 5 answers · asked by evan a 3

a. potential energy
B. Kinetic Energy
C. Solar Energy
D. Radiant Energy

My Guess is potential energy, however I'm not sure.

2007-05-21 10:16:48 · 5 answers · asked by Anonymous

can someone please explain how to do these step by step?

1) hydrogen fuels are rated with respect to their hydrogen content. determine the percent hydrogen for the following fuels:
a) ethane, C2H6
b) methane, CH4
c) whale oil, C32H64O2

can someone please tell me how to do these? even just doing 1 or 2 of these would maybe teach me how to do it.

2) oxidizers are generally compounds that contain relatively large mass percentages of oxygen. hydrogen peroxide and sodium nitrate are good oxidizing agents. compare the mass percent of oxygen in each of these compounds

i also need help with this one.

thank you very much?

2007-05-21 10:13:51 · 3 answers · asked by sxe_afi_fallchild 1

2007-05-21 10:10:59 · 2 answers · asked by Anonymous

under the conditions of oxidation

what does it mean when it states "heating the alcohol under reflux"...prefarably in simpl as level chemistry terms please

thank you again :)

2007-05-21 10:09:45 · 6 answers · asked by pumakelmusa 2

2007-05-21 10:07:09 · 5 answers · asked by mrs67pk 1

2007-05-21 10:05:18 · 5 answers · asked by mrs67pk 1

2007-05-21 09:56:36 · 6 answers · asked by mrs67pk 1

2007-05-21 09:53:37 · 5 answers · asked by esteban 1

2007-05-21 09:42:10 · 8 answers · asked by Candice 3

2007-05-21 09:36:09 · 2 answers · asked by Anonymous

true or false

if false why

2007-05-21 09:35:38 · 2 answers · asked by Anonymous

2007-05-21 09:28:22 · 7 answers · asked by Anonymous

true or false

2007-05-21 09:10:55 · 4 answers · asked by Meno 1

a. it can act as either an acid or a base
b. its Kw varies as the temperature changes
c. [H3O+] = [OH-] for water
d. it is completely ionized in its liquid state.

2007-05-21 09:07:31 · 9 answers · asked by Meno 1

I have 3 questions I need to finish.
One of them asks how many molecules are there in one mole? I'm not sure about that one but I put 6.23*10^23. Is that correct?
Quest. 2 says how many molecules are there in 444g of Li2CO3?
& #3- What is the mass (in grams) of 5.22*10^25 molecules of BaSO3?

2007-05-21 08:57:51 · 1 answers · asked by Spideyluvr 1

I understand that an Ionic bond gives one or more electrons and a Covalent bond shares electrons. My question is what detirmes when electrons are share or given away.

2007-05-21 07:01:09 · 9 answers · asked by Alex V 1

Reaction: NH4NO2(s) ----> N2 + 2H2O(g)
a. how many grams of ammonium nitrite must have decomposed at 200.0 C in a 2.00 L container if the pressure rose from 0 to 625 torr.
b. what is the partial pressure of nitrogen gas in the mixture?

2007-05-21 06:42:27 · 2 answers · asked by Vlada 1