Chemistry - March 2007

i.e the steps involved

2007-03-03 09:50:44 · 2 answers · asked by mel s 2

52) Xplain Y ice melts at 0 degrees c w/o an increase of temp, even tho heat is flowin from the surroundings in2 the system.
64) Equal masses of 2 substances absorb the same amount of heat. The Temp of substance “A” increases twice as much as the Temp of substance “B”. Which substance has higher specific heat? Xplain
72) A orange contains 445 kj of energy. What mess of water could this same amount of energy raise from 25 degrees Celsius to the boiling point?
76)C- if a thermometer means pressure, what does a calorimeter do? Pick: constant pressure, reactants, endothermic, or heat.
82)The temp of a person w/ an extremely
high fever can be lowered w/ a sponge bath
of isopropyi alcohol (C3H7OH). The heat of
vaporization of this alcohol is 11.1 kcal/mol.
A) How many kilocalories of heat are removed
from a person's skin when 175 g of isopropyl
alcohol evaporates? How many kilojoules?
B)How many kg of water would this
energy loss cool in lowering the temp
from 40.0 C to 36.0 C?

2007-03-03 09:48:29 · 1 answers · asked by truckin_90 2

Fe(OH)3 + 3 HNO3 + N2HPO4 -->

2007-03-03 09:45:46 · 3 answers · asked by kelsey11490 1

When you put your hand in a pan of boiling water it burns, and water boils at 100 degrees celsius. When going into a sauna you are entering a hot room which can reach higher temperatures so why doesn't skin blister?

2007-03-03 09:37:51 · 16 answers · asked by Anonymous

Fe(NO3)3 + Fe(OH)3 + 3 HNO3 -->

2007-03-03 09:29:42 · 5 answers · asked by kelsey11490 1

I have 2 do a brochure on Iron/Iron Ore and the Canadian Ec., i really neeeeeeeeeeeed help

2007-03-03 09:26:02 · 2 answers · asked by Oghale 2

2007-03-03 09:20:46 · 0 answers · asked by Anonymous

Fe(OH)3 + 3 HNO3 + KSCN --> ??

2007-03-03 09:14:02 · 3 answers · asked by kelsey11490 1

How would you write the equation : H2O + Fe(NO3)3 --> ???

2007-03-03 08:57:37 · 3 answers · asked by kelsey11490 1

in correlation to pressure

2007-03-03 08:53:32 · 9 answers · asked by Anonymous

2007-03-03 08:33:15 · 9 answers · asked by horse.trader@btinternet.com 3

my sis is doing a science project

2007-03-03 08:27:20 · 4 answers · asked by distancekid4214 1

2007-03-03 08:08:53 · 4 answers · asked by Anonymous

could you please tell me how to remember this table, and your understanding.thanks

2007-03-03 07:53:37 · 3 answers · asked by for2000 3

2007-03-03 07:52:21 · 1 answers · asked by Adam B 1

Write the name of the species being oxidised. Also write the name of the oxidising agent.

Cl2 (aq) + 2OH- (aq) ====> Cl- (aq) + ClO- (aq) + H2O (l)

What special type of reaction is illustrated by the above reaction?

2007-03-03 07:52:01 · 2 answers · asked by Anonymous

a. Calcium Nitrate
b. Potassium Bromide
c. Lead nitrate
d. Barium Nitrate
e. Sodium Chloride

2007-03-03 07:40:43 · 3 answers · asked by ChristFirst00 2

Does anyone know if its possible to seperate the other crap in hot hands from the vermeculite? I need the iron power and vermeculite for a science project and my parents would never let me buy chemicals that they didnt understand.

2007-03-03 07:38:07 · 1 answers · asked by Anonymous

i.e. Oil and water.

2007-03-03 07:31:59 · 5 answers · asked by Anonymous

Distinguish between ionic and covalent bonds in terms of how each is formed and how to predict which will be formed when various elements combine.

2007-03-03 07:30:45 · 2 answers · asked by snoopy111690 1

Why do different substances give off different colors? Please be specific. This is based on a flame test for: sodium chloride, sodium nitrate, lithium nitrate, potassium nitrate, calcium nitrate, strontium nitrate, barium nitrate, and sodium chloride (solid). I think that somehow it has to do with Bohr's Theory, but I'm not sure how to explain it.

2007-03-03 05:35:47 · 3 answers · asked by pageblankn 2

(Type your answer using the format [NH4]+ for NH4+ and [Ni(CN)4]2- for Ni(CN)42-.)
__________

Give the equation of this process. (Type your answer using the format (NH4)2CO3 for (NH4)2CO3. Use the lowest possible coefficients.)
_____ H3PO4 + ___ ___ = ___ ____ + ____ H2O

2007-03-03 05:34:42 · 1 answers · asked by Anonymous

Which of the following compounds present exceptions to the octet rule ?



a) SeF2


b) PCl3O


c) XeF6


d) ClO3-


e) NF3

2007-03-03 05:21:30 · 3 answers · asked by Ashley J 1

Which of the following compounds are best described using resonance structures ?


Consider all reasonable resonance structures for each compound or ion.

a) N2O4


b) CN -


c) C2H4O


d) IF5


e) C2H6O

2007-03-03 05:21:00 · 2 answers · asked by Ashley J 1

Choose those statements that are true for the most stable resonance structure of the molecules H−C−N and C−N−H



a) Both of these structures have a triple bond between the carbon and nitrogen atoms

b) Both of these structures have a positive charge on the nitrogen atom

c) CNH is predicted to be more stable than HCN

d) Each resonance structures have a total of ten valence electrons

e) These two resonance structures are resonance structures of different molecules

2007-03-03 05:19:14 · 1 answers · asked by Ashley J 1

2007-03-03 05:12:20 · 2 answers · asked by Anonymous

What is the result of Fe+ S ----->? (kg)

2007-03-03 05:12:09 · 1 answers · asked by Anonymous

one entry mentions how the troops were suffering from lack of water and although they had enough to drink, they could hardly ever wash.

He says one day that the battallion did the washing in Aviation fuel.

Is this possible? and wouldnt it be firstle very hazardous, and secondly likely to make people sick?

2007-03-03 04:51:24 · 3 answers · asked by jademonkey 5

Convert 2.8 Eg to Kg.
How to?

2007-03-03 04:06:01 · 2 answers · asked by kickitup21 1

Steve tried to make 3 solutions of calcium phosphate with a concentration of 2.5 mol/L.
Solution #1 - Mass = 78.3 g Volume= 101.4 mL
Solution #2 - Mass = 76.5 g Volume= 99.8 mL
Solution #3 - Mass = 150.2 g Volume=196.6 mL

*What's the concentration of each of the three solutions?
*Calculate the percent error for each. Which is most accurate & why?

STEPS please don't understand.
Thanks.

2007-03-03 04:01:43 · 1 answers · asked by kickitup21 1