Chemistry - February 2007

2007-02-23 05:50:01 · 2 answers · asked by Kd 1

2007-02-23 05:47:43 · 3 answers · asked by datboydee1 1

10% aceton causes turbidity of egg albumin solution.100% ethanol causes flocculation,While 7% HgCl2 is apparently protein coagulative.All these are visible observations of effects of coagulative fixatives on proteins.In Protein crosslinking with 8% formaldehyde; 3% pot dichromate or 10% acetic acid no visible changes are observed.If"Cross-links are covalent bonds linking one polymer chain to another" ,it seems contradictory to state "Crosslinking inhibits close packing of the polymer chains" .What is really happening to proteins in that "invisible"reaction?

2007-02-23 05:39:43 · 1 answers · asked by Ahmed S 1

This is part of my GCSE science coursework, any useful websites will be helpful, thanks

2007-02-23 05:38:45 · 4 answers · asked by Anonymous

option's are
1.bronze
2.copper
3.iron
4.gold

2007-02-23 05:37:59 · 4 answers · asked by GAURAV S 1

I forgot my chemistry book at school and these questions are due tomorrow. If you don't know an answer to the question please dont guess. Just say dont know. thanks.

1. The bond formed between Be (atomic number 4) and Iodine (atomic number 53) would probably be
A. covalent
B. ionic
C. metallic
D. network

2. Which formula represents the way Potassium and Oxygen would combine to form a compound?
A. P(2)O
B. PO(3)
C. K(2)O
D. KO(2)

3. In a balanced chemical equation,
A. atoms are conserved
B. molecules are equal
C. coefficients are equal
D. energy is not conserved

4. The prefix poly- as used in polyatomic means
A. into
B. female
C. plastic
D. many

5. Two or more substances combine to form one substance in a
A. decomposition reaction
B. double-replacement reaction
C. single-replacement reaction
D. synthesis reaction

6. In an endothermic reaction, heat is
A. absorbed
B. released
C. destroyed
D. conserved

2007-02-23 05:35:46 · 7 answers · asked by Mike 2

Is it true thathydrogen peroxide is an oxidising agent so can oxidise any components in the nerve cells ,thereby destroying them

2007-02-23 05:29:43 · 2 answers · asked by braddock 1

When funneling our mixure we were told to tear a corner of the filter paper, or side, however you want to view it, and then put it in the funnel. Why is it that you tear the corner?

2007-02-23 05:14:40 · 3 answers · asked by xoxstarstruckoxo 3

For CH3OH the enthalpy of vaporization is 38.0 kJ/mol. The entropy of vaporization is 113 J/(K mol).
Calculate the normal boiling point (Kelvin).

2007-02-23 05:11:03 · 2 answers · asked by enba18 1

2007-02-23 04:25:17 · 2 answers · asked by idkkkk 2

Fixatives can either cross-link proteins or coagulate them.What is the difference?.Guide me please if possible ,to diagrams that illusterate the two events.Does crosslinking implies denaturation of the protein or the story is something else?

2007-02-23 04:20:21 · 3 answers · asked by Ahmed S 1

I already know that it is used in fluorescent lights, and fluoride lasers. Are there any other uses?

2007-02-23 04:16:53 · 2 answers · asked by Anonymous

a) For the reaction CO2(g) → CO2(s)
entropy increases


b) For the reaction NaCl(s) + H2O(l) → NaCl(aq)
entropy increases


c) Molecules Cl2(g) should have have greater
entropy per mole, than molecules of SO2(g)


d) If entropy decreases for a certain process, the entropy of the universe increases

2007-02-23 04:14:38 · 2 answers · asked by Anonymous

Calculate the sublimation temperature (Kelvin).

NOTE: the data given may not be from the Appendix. You need an equation that gives the unknown quantity in terms of the two given ones. Also entropy is usually reported in J/mol-k, while enthalpy usually reported in kJ/mole

2007-02-23 04:13:41 · 2 answers · asked by Anonymous

2007-02-23 04:10:04 · 2 answers · asked by ONE 1

These three elements are from the same family on the periodic table in the "noble gases" family. They are in number 18.

2007-02-23 04:09:24 · 8 answers · asked by Anonymous

we would like to know the averege price of the magnesuim powder

2007-02-23 04:08:08 · 3 answers · asked by signup c 1

1. H2O + CO (gives) H2 + CO2
is this reaction exothermic or endothermic?

2. arrange in order of basicity: NH3, H2O, HF. please explain.

3. which of the quantum numbers are directly derived from Schrodinger wave equation.

4. arrange in order of acidity: HOClO, HOClO2, HOClO3. please explain.

5. why is the active mass of liquids and solids taken to be unity?

please answer as soon as possible.

2007-02-23 03:57:45 · 3 answers · asked by Anonymous

2007-02-23 03:26:15 · 4 answers · asked by Anonymous

2007-02-23 03:24:24 · 1 answers · asked by Anonymous

2007-02-23 03:24:18 · 5 answers · asked by Anonymous

This is for my science fair project. My teacher said make a data table for the ingredients used for Tulips. Ingredients were sugar, water, flower food, and sparkling water.

2007-02-23 03:16:45 · 2 answers · asked by brat 2

2007-02-23 03:02:57 · 8 answers · asked by Chanta N 1

6 hydroxy 5 (2 methoxy 5 methyl 4 sulfophenylazo) 2 naphtalenesulfonic acid sodium salt

2007-02-23 02:48:03 · 4 answers · asked by globbermouth 2

2007-02-23 02:27:40 · 6 answers · asked by jloupe_21 1

a) For the reaction CO2(g) → CO2(s)
entropy increases


b) For the reaction NaCl(s) + H2O(l) → NaCl(aq)
entropy increases


c) Molecules Cl2(g) should have have greater
entropy per mole, than molecules of SO2(g)


d) If entropy decreases for a certain process, the entropy of the universe increases

2007-02-23 02:26:32 · 5 answers · asked by Foxychick 1

2007-02-23 02:05:50 · 3 answers · asked by Laquanda G 1

what is the common name for this scientific formula?

2007-02-23 02:05:48 · 8 answers · asked by globbermouth 2

2007-02-23 01:45:09 · 1 answers · asked by zedeleif 1

I am doing research about some crimes commited in my area where the modus oprandi was burning the bodies. In one of the three cases, the body was completely destroyed with the exception of three small bones(could not get dna). In the other two, they were burned beyond recognition. What was the difference? I am trying to find out if certain chemical agents were used on the destroyed body as to gasoline being used on the two that could provide dna

2007-02-23 01:02:08 · 4 answers · asked by silent watcher 2