Chemistry - May 2007

For my chemisrtry class we have to write a two page essay on how soap relates to what we have learned in our chemisry class. we also have to make a powerpoint on it. how does soap relate to chemistry? what kinds of bonds are used and what can i put in my essay?

2007-05-31 11:31:17 · 2 answers · asked by Surrahh :D 2

http://schoolisland.com/review/courses/c...
The diagram represents a chemical cell at 298 K. When the switch is closed, electrons flow from

Al(s) to Ni(s)
Ni(s) to Al(s)
Al3+(aq) to Ni2+(aq)
Ni2+(aq) to Al3+(aq)

Given the reaction for the nickel-cadmium battery:
2NiO2 + Cd + 2H2O --> 2Ni(OH)2 + Cd(OH)2
Which species is oxidized during the discharge of the battery?

Ni 3+
Ni 2+
Cd
Cd2+

2007-05-31 11:26:16 · 2 answers · asked by xenycexgurlx 1

2007-05-31 11:18:36 · 1 answers · asked by Anonymous

2007-05-31 10:49:37 · 5 answers · asked by tony g 1

The following data was obtained for the reaction 2A + B ---> 2D @ 25 degrees celsius. What is the rate law expression for the reaction?

Experiment 1, initial [A] was .500, initial [B] was .400, and the initial rate of formation D was 6 X 10 to the -3.

Experiment 2, initial [A] was .250, initial [B] was .400, and the initial rate of formation D was 1.5 X 10 to the -3.

Experiment 3, initial [A] was .250, initial [B] was .800, and the initial rate of formation D was 3 X 10 to the -3.

How do I solve this? I took a sick day from class, we have this for homework tonight, and I need to get this prob to understand the homework. Any cool tricks are appreciated. Thanks in advance.

2007-05-31 10:47:20 · 3 answers · asked by Anonymous

2007-05-31 10:34:42 · 2 answers · asked by YIYA 1

how many grams of carbon dioxide are produced when 18.5 moles of oxygenreact with acetylene?2C2H2+2CH2+5O2 (g) 4CO2+2H20

2007-05-31 10:19:44 · 4 answers · asked by mommy Ty 3

it contains 3 moles of O or 3 moles of Ca or 3 moles of C or 9 moles of O or non of the above

2007-05-31 10:15:09 · 4 answers · asked by mommy Ty 3

0.01175g/mol or 0.0235g/mol or 0.0588g/mol or 107g/mol

2007-05-31 10:11:34 · 2 answers · asked by mommy Ty 3

Write a balanced equation for the reaction of calcium hydroxide, Ca(OH)2, with phosphoric acid, H3PO4, forming calcium phosphate, Ca3(PO4)2 and water, H2O. Calculate the heat of reaction from the standard heats of formation listed below. Then, calculate the standard enthalpy change when 42.4 grams of phosphoric acid is consumed in this reaction. standard heat of formation(Ca(OH)2) -986 kJ/mol standard heat of formation(H3PO4) -1279 kJ/mol standard heat of formation(Ca3(PO4)2) -4132 kJ/mol standard heat of formation(H2O) -285 kJ/mol

2007-05-31 10:09:28 · 1 answers · asked by Division12 2

In comparing two compounds of nitrogen and oxygen, it was found that for every 14 grams of nitrogen in compound A there were 16 grams of oxygen. In compound B, for every 14 grams of nitrogen there were 32 grams of oxygen. The ratio of oxygen masses combining with a constant nitrogen mass in these compounds is therefore 2 to 1. Which of the following is illustrated by this observation?"

a) Law of conservation of matter
b) Daltons hypothesis
c) law of multiple proportions
d) Law of definite proportions

2007-05-31 10:09:23 · 3 answers · asked by jane C 1

Given the reaction: Zn(s) + 2 HCl(aq) --> ZnCl2(aq) + H2 (g)

Which statement correctly describes what occurs when this reaction takes place in a closed system?

Atoms of Zn(s) lose electrons and are oxidized.
Atoms of Zn(s) gain electrons and are reduced.
There is a net loss of mass.
There is a net gain of mass.

The diagram represents a chemical cell at 298 K. When the switch is closed, electrons flow from

Al(s) to Ni(s)
Ni(s) to Al(s)
Al3+(aq) to Ni2+(aq)
Ni2+(aq) to Al3+(aq)

Given the reaction: Cu(s) + 4HNO3(aq) --> Cu(NO3)2(aq) + 2NO3(g) + 2H2O(l )
As the reaction occurs, what happens to copper?

It undergoes reduction and its oxidation number decreases.
It undergoes reduction and its oxidation number increases.
It undergoes oxidation and its oxidation number decreases.
It undergoes oxidation and its oxidation number increases.

2007-05-31 10:05:37 · 1 answers · asked by xenycexgurlx 1

194g/mol or 208g/mol or 224g/mol or 180g/mol or 386g/mol

2007-05-31 10:03:53 · 2 answers · asked by mommy Ty 3

Add 3a - 4 + a + 6

Subtract -3m + 1 - 2m - 6

thank you

2007-05-31 09:50:29 · 2 answers · asked by CHRISTOPHER R 1

1. What are the mixtures of gases in the atmosphere? Are they solution, suspension, or colloid and why?
2. Compare the percent composition of gases in the atmosphere at sea level to the percent compostion at high altitude.
10pts to best answer!

2007-05-31 09:39:55 · 4 answers · asked by Anonymous

Does HCl form any hydrogen bonds? I know that hydrogen bonding occurs when hydrogen is bonded to a very electronegative atom like fluorine, oxygen, or nitrogen. But I was wondering whether there would be hydrogen bonding in hydrogen chloride since chlorine does have a high electronegativity. Infact, I believe chlorine and nitrogen have the same electronegativity so I suppose it would form hydrogen bonds.

2007-05-31 09:32:07 · 2 answers · asked by Anonymous

2007-05-31 09:03:30 · 22 answers · asked by Anonymous

Which of the following elements is an f-block element?

a.C
b.Cd
c.Cs
d.Cl
e.Cf

2007-05-31 07:48:30 · 4 answers · asked by Anonymous

Im having a ahrd time naming out the structures. Any good sites that help with this O-chem stuff?

2007-05-31 07:37:46 · 5 answers · asked by Anonymous

What is the maximum number of electrons that can occupy the n = 2 shell?

a.4
b.8
c.18
d.32
e.50

is it a?

2007-05-31 07:36:48 · 2 answers · asked by Anonymous

i'm doing a report on elements Bromine happens to be one. i need help.i appreciate it thanks.

2007-05-31 07:29:54 · 5 answers · asked by mike f 1

I have a Chemistry exam, can't find the answer on the internet/in my books!

2007-05-31 07:27:23 · 2 answers · asked by Anonymous

Which of the following statements are CORRECT?

1.Substances that retain their magnetism after they are withdrawn from a magnetic field are called ferromagnetic.
2.A diamagnetic substance is slightly repelled by a magnetic field.
3.An atom with an even number of electrons is diamagnetic.

a.1 only
b.2 only
c.3 only
d.1 and 2
e.1, 2, and 3

2007-05-31 07:22:41 · 1 answers · asked by Anonymous

How could you distinguish nitric acid (HNO3) from hydrochloric acid (HCl)?

2007-05-31 07:22:03 · 4 answers · asked by Eric 6

WHATS THE STRONGEST ALKALI????????

2007-05-31 07:17:03 · 3 answers · asked by Anonymous

What is a better name for 1-methyl butane?
How does glycine and alanine perform dehydration synthesis?

2007-05-31 06:57:25 · 4 answers · asked by Luthien 4

In thiosulphate what are the oxidation number of the sulphurs and the oxygens?

2007-05-31 06:52:39 · 2 answers · asked by basilb101 3

For a neutron (mass = 1.675 × 10-27 kg) moving with a velocity of 5.2 × 103 m/s, what is the de Broglie wavelength?

a.2.1 × 10-6 m
b.1.3 × 1010 m
c.486 m
d.7.6 × 10-11 m
e.4.5 × 10-9 m

2007-05-31 06:51:18 · 4 answers · asked by Anonymous

Excited hydrogen atoms emit light in the ultraviolet at 2.47 × 1015 Hz. What is the energy of a single photon with this frequency?

a.6.11 × 10-17 J
b.1.21 × 10-7 J
c.8.04 × 10-41 J
d.1.64 × 10-18 J
e.2.68 × 10-19 J

2007-05-31 06:51:09 · 2 answers · asked by Anonymous

A red laser pointer emits light at a wavelength of 635 nm. If the laser emits 7.5 × 10-4 J of energy per second in the form of visible radiation, how many photons per second are emitted from the laser?

a.4.2 × 10-16 photons/sec
b.2.4 × 1015 photons/sec
c.1.8 × 1036 photons/sec
d.2.7 × 1022 photons/sec
e.6.3 × 1017 photons/sec

2007-05-31 06:49:23 · 4 answers · asked by Anonymous