Chemistry - January 2007

1) What is a triple covalent bond?
a. an electron is shared between 3 atoms
b. 3 electrons are shared between 3 atoms
c. 3 electrons are shared between atoms

2) a diamond is composed of?
a. metals (Al)
b. Non metals (O)
c. Transition metals (Zn)
d. Metalloids (C)

3) Does silicon dioxide have the same structure asd diamonds?
a. yes
b.no
c. it depends on which diamond

4) Which of these proprieties for a diamond is correct?
a. low melting point
b. soluble in water / orgainic substances
c. doesnt conduct electricity

2007-01-06 13:42:29 · 2 answers · asked by Anonymous

2007-01-06 13:31:32 · 8 answers · asked by anonymous91 1

On the topic of acids and bases, how can you tell if there is calcium chloride or baking soda in your toothpaste without looking at the ingredients label?

2007-01-06 13:31:32 · 3 answers · asked by Anonymous

complete each of the following equations by writing the condensed structural formula for the product that is more likely to form.

a.) CH3CH=CHCH2CH3+H2-->

B.) CH3CH2C(-Cl)HCH2CH3+OH' -->

C.) CH3CH2C=- CCH3+ 2 H2-->

D.) CH3CH2C(-OH)HCH2CH3-- dehydration >

2007-01-06 12:56:57 · 2 answers · asked by babycakez 3

a.) alkyl halide-> alkene
b.) alkene-> alcohol
c.) alcohol+carboxylic acid->ester

(substitution, elimination, addition, oxidation-reaction, condenstation=)

2007-01-06 12:48:05 · 1 answers · asked by babycakez 3

so thanx to those who answered my previous question which was specifically about phosphoric acid (H3PO4)

someone said that the reason why H became 3 because you need three um, was that charge? whatever, you need 3 thingies to balance it with PO4

but how did you come up with PO4? is there a way to get the 4? coz P's charge is 3 and O's charge is 2 and i dont get how 4 came out.

help again pleeeeese!

and thanx!!

2007-01-06 11:35:27 · 1 answers · asked by pweetyinpink05 2

2007-01-06 11:25:46 · 7 answers · asked by Paul 3

its for an eighth grade science fair topic..and umm we need to measure soething..is that the time when the candles stop burning?

2007-01-06 11:15:25 · 2 answers · asked by Anonymous

if it is, does that mean that it can cause pollution??? how? O.O i need the answer so badd.. T~T

2007-01-06 11:06:47 · 4 answers · asked by Jan Cheyanne P 1

2007-01-06 11:06:31 · 7 answers · asked by rockabilly.betty 2

how do you do it!?!? we have this homwork and our teacher hardly taught us sumthing and im stuck in number 2 which is phosphoric acid. when i looked up in the internet, they all dont tell how exactly it turned into H3PO4. does anyone how it turned out like this? and do you know any understandable rule for this?

to those who could answer,,,, THANX!!!!!!!!

2007-01-06 11:04:09 · 5 answers · asked by pweetyinpink05 2

soon as possible

2007-01-06 10:39:48 · 2 answers · asked by Anonymous

2. Balance the following equation: Al+ CuO -> Al2o3 +Cu

4. Choose the answer that shows a correctly balanced equation.
a. Ni(NO3) 2 + 2 NaOH -> Ni(OH) 2 + 4NaNO3
b. Ni(NO3) 2 + 2 NaOH -> Ni(OH) 2 + 2 NaNO3
c. Ni(NO3) 2 + NaOH -> Ni(OH) 2 + 2 NaNO3


6.Balance this equation
NaNO3 + PbO ->Pb(NO3) +Na2O

2007-01-06 10:28:39 · 5 answers · asked by nice too meet you. 4

2007-01-06 10:24:23 · 3 answers · asked by chigusa 1

2007-01-06 10:21:32 · 5 answers · asked by mr_schmotis 2

Does anyone know of a good website that sells research chems for cheap and thats reliable?

Chems like 2C-E, Methylone, 5-meo-DMT and so on? I know that alot of U.S. sites have bbeen shut down but theres alot of over sea ones ive heard of.

2007-01-06 10:18:01 · 0 answers · asked by Im not stupid i just dont care 2

please help it confuses me the more i try : Mg(OH)2 + H3PO4 -----> Mg3(PO4)2 + H2O

2007-01-06 10:16:40 · 5 answers · asked by kei 2

1. What are the correct formulas of the products for this reaction:
Pb(NO3)2 + NaCl2--->

a. Ba(CO3) + K2Cl
b.PbCl + NaNO3
c.PbCl2 + NaNO3
d. PbCl3 + NaNO3

2. What are the correct formulas of the products for this reaction:
Al+Cl2--->

a. AlCl2
b. Al2Cl3
c. AlCl3
d. AlCl4

3. In a _____ reaction, two or more elements or compounds form one product.

a.double replacement
b. decomposition
c. combination
d. single replacement
e. combustion

4. The following reaction is an example of a _____ reaction.
2Na + Cl2g --> 2NaCl

a.decomposition
b. displacement
c. double replacement
d. single replacement
e. combination
5.
6. What coefficient should be in front of bromine (Br2) in the balanced equation for the following reaction?
CBr4 +BrO3 -->CO2 + Br2

a. 7
b. 6
c. 4
d. 3
7. Which is properly balanced and written correctly?
a. 2Na+ 4Cl2 -> 2NaCl
b. 2Na+2H2O-> 2NaOH+h2
c. 2HCl+ Mg -> 2MGCl2 +h2

2007-01-06 09:29:28 · 4 answers · asked by nice too meet you. 4

A student reacts 156 g of C2H4(g), 290 g of Bromine(g) and 354 g of Chlorine (g) to form C2H4ClBr(g).

1. Write out the balanced chemical reaction.
2. Which reactant is the limiting reagent?
3. How many moles of C2H4ClBr will be produced?
4. What mass of C2H4ClBr will be produced?
5. After the reaction is completed how many moles of each reactant will remain?

2007-01-06 09:00:55 · 4 answers · asked by Maria18 2

How much time passed before the elements as we know them were formed?

2007-01-06 08:55:40 · 7 answers · asked by sunny p 1

2007-01-06 08:50:58 · 4 answers · asked by galena 2

such as freezing or is the alcohol chemically bonded with the water molecules

2007-01-06 07:43:25 · 1 answers · asked by Anonymous

2007-01-06 07:25:56 · 12 answers · asked by Anonymous

U-A-G-G-A-C-U
C-G-A-A-G-T-C
C-A-U-G-A-T-C
A-U-C-C-U-G-A
U-A-G-G-A-C-U

can some one please explain this.
I red the chpater but still dont understand

2007-01-06 07:14:33 · 1 answers · asked by LEAH 3

2007-01-06 07:12:42 · 3 answers · asked by Allie C 2

We are doing an experiment for a program that involves potassium dichromate, heavy metal ions, and bioremediation.

2007-01-06 07:04:23 · 6 answers · asked by Anonymous

Im abouit to take module 1 of AQA AS LEvel Chemistry, but i cant remember the formulas for it- can someone help me please?

2007-01-06 06:39:26 · 6 answers · asked by Anonymous

The question's pretty self-explanatory lol

2007-01-06 06:18:52 · 1 answers · asked by Mark 1

chocies are geometric arrangement of the atoms
number of atoms of each element present
percent composition of the compound
bonding capacity of each carbon atom

2007-01-06 06:17:50 · 2 answers · asked by Oscar 2

I have to take this before going into the nursing program, Is it hard? What do you learn about in Chemistry for Health Sciences?

2007-01-06 06:11:44 · 2 answers · asked by Anonymous