Chemistry - January 2007

CF4, CHF3, OF2, HF are placed in which categories, London dispersion, dipole-dipole, and hydrogen bonding?

2007-01-31 02:22:05 · 2 answers · asked by Anonymous

Assume that 3.09 x 106 kJ are needed to heat a swimming pool. If this energy is derived from the combustion of methane (CH4) at standard conditions (25 oC and 1 atm) what volume in liters of methane must be burned?


The heat of combustion of methane is 889.967 kJ/mol. The density of methane is 0.0680 kg/m3

2007-01-31 02:20:31 · 6 answers · asked by Foxychick 1

I am working on a homework assignment and having a hard time any tutors out there

2007-01-31 02:17:05 · 4 answers · asked by rae 1

2007-01-31 02:11:14 · 3 answers · asked by zinky b 1

But it IS frequently used to determine the molar mass of unknown non-electrolyte compounds!

2007-01-31 02:07:31 · 3 answers · asked by AppleCard! 2

2007-01-31 01:59:35 · 6 answers · asked by The Truth Hurts! Ouch! 5

A 70.3 kg person eats three 38.7 g brownies with nuts. What percentage (%) of their daily basal metabolic rate have they ingested ?




How long would it take, in minutes, for the person in the above question to walk off all the calories in the three brownies ? Walking requires energy equal to 2.5 times the basal metabolic rate.

Do NOT consider the energy needed to digest, absorb, and metabolize the snack itself, which the text describes as 10% of the ingested amount of food. Use the total amount of the energy in the three brownies in your calculation.

2007-01-31 01:51:38 · 2 answers · asked by sunyrob 1

A house with a 15.3 × 103 ft2 floor area and 8.00 ft high ceilings is to be heated with propane. How many kilograms of propane would be needed to raise the temperature of the air inside the house from 59.0 oF to
72.0 oF ?. In this calculation your are ignoring the temperature of the walls etc.



The moloar specific heat of the air inside the house is 30.2 J mol −1 oC −1
The average density of air over this temperature range can be estimated to be 1.22 g/L.
The molar mass of air is 29.1 g/mol.
There are 28.317 liters in a cubic foot.
The molar heat of combustion of propane is −2220.047 kJ/mol

2007-01-31 01:50:42 · 2 answers · asked by sunyrob 1

Assume that 3.57 x 106 kJ are needed to heat a swimming pool. If this energy is derived from the combustion of liquid ethanol (CH3CH2OH) at standard conditions (25 oC and 1 atm) what volume in liters of ethanol must be burned?




The heat of combustion of ethanol is 1366.818 kJ/mol. The density of ethanol is 0.789 g/cm3


Enter a numeric answer only. Do not enter units.

2007-01-31 01:50:14 · 1 answers · asked by sunyrob 1

2007-01-31 01:42:03 · 4 answers · asked by jackass 1

1.750 kg of ice at 0.00 degrees celcius is added to 500.0 g of water in an insulated container. What is the mass of ice that remains unmelted after equilibrium is established?

2007-01-31 01:31:48 · 1 answers · asked by Anonymous

It says in my chemistry text book that they are 92 types of atoms originally found on Earth ... & 26 make up our body ... What are these 26?

Thanks

2007-01-31 01:03:34 · 2 answers · asked by H²O 2

2007-01-31 00:45:36 · 2 answers · asked by +++cHaRmZ+++ 1

In each of the two cases, which of the solutions is more concentrated in water? Why (so I can try to do the rest of them on my own)?
a) .500 M KCl or 0.5% KCl
b) 1.75 M glucose or 1.75 m glucose

2007-01-31 00:43:19 · 3 answers · asked by samaireh d 1

2007-01-31 00:40:38 · 4 answers · asked by +++cHaRmZ+++ 1

Potassium-40 decays to argon-40 with a half life of 1.3 billion years.When a volcano erupts and the molten rock cools, it contains 100% Potassium-40 and 0%argon-40 (because argon is a gas). A researcher found a fossil in volcanic rocks that contains 25%potassium-40 and 75%argon-40. How long ago did the fossilized organisms lived?

2007-01-31 00:23:27 · 3 answers · asked by Anonymous

2007-01-31 00:20:03 · 3 answers · asked by john w 1

2007-01-31 00:17:50 · 8 answers · asked by Cherille 1

WHAT IS THE STORY BEHIND THIS CHEMICAL

2007-01-31 00:14:53 · 1 answers · asked by Anonymous

2007-01-30 23:48:19 · 2 answers · asked by mani 1

2007-01-30 23:43:02 · 10 answers · asked by cutiez galz 1

2007-01-30 23:08:52 · 0 answers · asked by Mr.McLaren 2

This has bugged me for years. What is the name given to a unit of Mercury? I watched an OU programme years back am I'm sure it was something like Quink. Then they are put into flasks. The programme showed a cannon ball floating in a tank full of Mercury.

2007-01-30 22:53:17 · 3 answers · asked by Anonymous

a say this b'coz me mum is very sick and yet they removed water from her back twice

2007-01-30 22:51:40 · 4 answers · asked by MUTESA h 1

2007-01-30 22:48:11 · 1 answers · asked by pearl 1

is it liquefied petroleum gas (LPG) or something else,
in pakistan gas comes through pipes and it is in the form of air,
and in india, and USA they use LPG, so how do u use LPG if it is not coming through pipe, and how much it costs u per liter
thanks?

2007-01-30 22:07:10 · 3 answers · asked by Qariskaxoor 1

2007-01-30 21:49:07 · 3 answers · asked by Yan 1

What is the result of burning this mixture in an engine?

2007-01-30 21:23:14 · 1 answers · asked by Updater 1

1.Write the chemical equation involved in the reaction between concentrated nitric acid (HNO3) and glucose?

2.Cite at least 3 other sugars which will give a positive result in the music acid test? Why will these give positive results?

3.What sugars form the characteristic osazone crystals? How do the crystals differ?

4.What is responsible for the intense blue color formed in the iodine test for starch?

5.What is the purpose of grinding with sand and TCA in preparing glycogen?


...thank you for your effort, God Bless!

2007-01-30 21:00:48 · 1 answers · asked by 'd campus Hearthrob 1

Hey,

If an amino acid is involved in the formation of a sulfur bond, what can you conclude about the molecular formula of that amino acid?

2007-01-30 20:48:30 · 1 answers · asked by Anonymous