Chemistry - September 2006

2006-09-12 06:09:14 · 10 answers · asked by bukky b 2

2006-09-12 06:08:36 · 3 answers · asked by Anonymous

2006-09-12 05:48:35 · 10 answers · asked by Anonymous

why is hydrogen the only element using this naming convention

2006-09-12 05:42:51 · 5 answers · asked by ? 1

2006-09-12 05:34:44 · 6 answers · asked by ANGIE 1

As we know we use the paint mainly to protect the metal from corrosion.
Paints protect the metal in different ways. Some of the just shield the metal from environment, Some by inhibiting the funtion of galvanic cell, which is required for coorosion.
like red lead which is known to be an anode inhibitor.
I will be happy to help me out.
I need the principle how and inhibiting paint work.

2006-09-12 05:27:43 · 2 answers · asked by behzad s 1

2006-09-12 05:23:59 · 13 answers · asked by cjb 1

2006-09-12 05:23:33 · 2 answers · asked by Hugo S 1

A 50.0 mL graduated cylinder has a mass of 42.3 g. When it is filled with an unknown liquid to the 46.3 mL mark, the cylinder and liquid combined have a mass of 115.1 g. Calculate the density of the liquid in g/cm3. SIG. FIG.

2006-09-12 05:17:53 · 5 answers · asked by dudekunle 3

A NaCl solution with a 266 mOsm will diffuse across into a Glucose solution with a 200 mOsm?

2006-09-12 04:55:23 · 3 answers · asked by Anonymous

2: A compound may be separated into its elements by
decomposition

evaporation

filtration

synthesis


3: An example of a chemical change is the
condensation of steam

corrosion of metals

dissolving of a substance in water

melting of ice


4: A substance composed of two or more elements chemically united is called
an allotrope

a compound

an isotope

a mixture


5: Air is a mixture because it
is colorless

is odorless

does not have a uniform composition

may be liquefied


6: A logical guess which is sometimes used to solve a scientific problem is called
the scientific method

a hypothesis

a theory

a law


7: An example of physical change is
burning

decaying

melting

rusting


8: The state of matter, commonly found on earth, in which the characteristic molecules move at the highest speed is
solid

liquid

gas

plasma


9: A substance which can be further simplified may be either
an element or compound

an element or a mixture

a mixture or a compound

none of the above


10: In the ________ state a substance has a definite shape and a definite volume.
liquid

gas

solid

none of the above


11: The amount of mass per unit volume refers to the
density

specific gravity

odor

state of a substance


12: A substance which cannot be further simplified or decomposed by ordinary chemical means is
a mixture

a compound

an element

a molecule


13: The smallest possible unit of a chemical compound that retains the properties of the entire compound is
a proton

an electron

an atom

a molecule


14: In the ________ state, a substance has neither a definite shape nor a definite volume
solid

liquid

gas

none of the above


15: A substance which results from the union of two or more substances in no definite proportion by weight is a(n)
element

compound

mixture

conglomerate


16: Milk is an example of a(n)
element

compound

mixture

conglomerate


17: A sample of calcium carbonate obtained in Kentucky contains 48% oxygen, 40% calcium and 12% carbon. A sample of calcium carbonate from Illinois would have the same proportion of elements. This is an example of the law of
Conservation of Matter

Definite Proportions

Multiple Proportions

Conservation of Energy


18: In the compounds carbon dioxide(CO2) and carbon monoxide (CO), the amounts of oxygen combined with the same amount of carbon are in the ration of 1:2. This illustrates the law of
Conservation of Matter

Definite Proportions

Multiple Proportions

Conservation of Energy


19: The amount of space a substance occupies is called its
density

volume

state

physical property


20: The property which compares the density of a substance with that of water is known as its
volume

specific gravity

shape

weight

2006-09-12 04:22:14 · 6 answers · asked by Anonymous

2006-09-12 02:40:46 · 13 answers · asked by Anonymous

2006-09-12 02:16:45 · 2 answers · asked by shahzeb_akhtar2002 1

shouldn't these things have a nutritional chart these days?

2006-09-12 02:12:41 · 5 answers · asked by j0eblobbs 1

2006-09-12 01:47:55 · 4 answers · asked by azy t 2

2006-09-12 01:41:02 · 1 answers · asked by rein 1

sodium is an element. The chemical formulae of sodium is Na.

2006-09-12 01:15:21 · 26 answers · asked by Anonymous

2006-09-12 00:17:47 · 3 answers · asked by Ashok Bhide@ashokbhide.com 2

Magnesium iodide
Aluminium carbonate
Aluminium oxide
Calcium iodide
Copper(II) iodide
Iron(II) nitrate
Iron(II) carbonate
Iron(II) iodide
Iron(III) carbonate
Iron(III) iodide
Iron(III) sulphate
Lead(II) carbonate
Lead(II) hydroxide
Ammonium carbonate
Ammonium oxide
Ammonium hydroxide
Silver sulphate
Silver hydroxide

Pls provide source of info. Help will be appreciated if you can provide answers for any one of them. Pls note that this is NOT my homework, I"m doing this for enrichment. Thanks.

2006-09-11 23:37:57 · 3 answers · asked by Forest_aude 3

why cant ch3cooh having more protonable hydrogen , a better solvent for sn1...

2006-09-11 23:17:55 · 4 answers · asked by Anonymous

please give me some...

2006-09-11 22:58:01 · 1 answers · asked by ♥Sweet_Anxiety♥ 2

2006-09-11 21:55:19 · 4 answers · asked by Anonymous

If there are two diastereomers a cis and a trans form, and if the trans form has an enantiomeric pair assosciated with it can the cis form be called a meso form as well? Sources please.

2006-09-11 20:46:21 · 1 answers · asked by Sarab s 3

2006-09-11 19:13:35 · 3 answers · asked by binoor 1

2006-09-11 18:45:39 · 20 answers · asked by Anonymous

2006-09-11 18:23:08 · 4 answers · asked by curious 1

LIfe needs a body,body needs self orgnising molucules,molucules are made of atoms,atoms are made of many subatomic particles,subatomic paticles are manifest form of energy.There are some known principle or laws whitch regulate their behavior.then what is life and its essence?Laws or Energyor somethingelse

2006-09-11 17:59:14 · 4 answers · asked by raghavaraoposani 1

im really curious.. for example how is it possible that Sodium (Na) and Chlorine (Cl) both by itself are toxic and harmful to human health when forming a compound Salt (NaCl) becomes harmless and useful? same as with Hydrogen and Oxygen forming water? I'll appreciate sensible answers... thanks..

2006-09-11 17:43:56 · 3 answers · asked by sen 3

2006-09-11 17:31:59 · 3 answers · asked by raindrop 1

2006-09-11 17:13:17 · 25 answers · asked by beaxox 1