Chemistry - August 2007

does that make sence.. i dont know how many spaces to move the decimal.. that and im trying to find how many molecules are in 5.0 micrograms of aspartame

2007-08-21 16:21:20 · 4 answers · asked by rebc 1

41. Mass of solid 18.325
Volume of water in cylinder 10.00 cm^3
Volume of water + solid 16.80 cm^3
What is the density of the solid?
a)0.372g/cm^3
b) 1.09 g/cm^3
c) 1.83 g/cm^3
d) 2.69 g/cm^3

42. A gold brick is 0.958 cm high, 2.020 cm wide, and 4.o cm long. What is its volume?
a) 7.7 cm^3
b) 7.74 cm^3
c) 7.74064 cm^3
d) 8 cm^3

45. What quantity of silver ions is obtained from 3.00 g of AgNO3?
a) 0.0177 mol
b) 0.0385 mol
c) 26.0 mol
d) 56.6 mol

46. What is the volume of 2,50 mol of varbon dioxide at STP?
a) 22.4 L
b) 44.8 L
c) 56.0 L
d) 110.L

47. Which quantity of carbon is contained in 0.15 mol of benzene, C6H6?
a) 0.15 mol
b) 0.90 mol
c) 12 mol
d) 18 mol

2007-08-21 16:16:31 · 2 answers · asked by ashley t 1

35. What is the concentration of the sodium ion, Na+ in a 0.300 M Na2CO3?
a)0.200 M
b) 0.300 M
c)0,600 M
d) 0.900 M

36. A 0.0010 M HCN solution has a ka = 6 x10^-10. Which terms describe this acid solution?
a)weak and dilute
b)strong and dilute
c)concentrated and weak
d) concentrated and strong

37. What is the ksp expression for strontium carbonate, SrCO3?

38. Ehat voume , in cm^3, of 0.100 M NaOH is required to beutralize 40.0 cm^3 of 0.100 M H2SO4?
a) 20.0
b) 40.0
c) 80.0
d)100

39. What must be true about this spontaneous reaction?
2Cr^2 + I2 > 2Cr^3 + 2I-
a) I2 is oxidized
b) Chromium ions are reduced
c) More electrons are lost than gained.
d) The standard potential is positive.

40. If 60 g of each solute is mixed with seperate 100 g sample of water at 20 C which forms unsaturated solutions?
a) all would be unsaturated.
b) only KBr would be unsaturated
c) only KNO3 would be unsaturated
d) NaCL, KCl, and KBr would be unsaturated

2007-08-21 16:02:04 · 1 answers · asked by sammy g 1

The alkaline earth metals have a +2 charge. What kind of charges do transition metals have?

2007-08-21 15:57:33 · 6 answers · asked by thunderbomb90 3

I just need a small bottle for an experiment, so the cheaper the better.

2007-08-21 15:50:19 · 4 answers · asked by Soosha 1

Am a first semester high-school student, and I have a lil doubt.
My teacher says these concepts are the the same: Antimatery and Bose-Einstein. But I've looked trough Internet and books and it doesn't say anything about antimatery when I look for for condensate, and viceversa. So I have this asking.

I'd like to clear this doubt.
Thanks!

2007-08-21 14:26:51 · 1 answers · asked by Anonymous

will gasoline float or sink in water?

2007-08-21 13:48:28 · 35 answers · asked by Anonymous

what are
Pb(C2H3O2)2
CuSO4
MgSO4
Mg(OH)2
CaSO4
N20

the answers are:
cugar of lead
blue vitrol
epsom salts
milk of magnesia
gypsum
laughing gas

[just kinda matching]
THANKS <3

2007-08-21 13:04:30 · 4 answers · asked by Stephanie P 2

2007-08-21 12:08:21 · 3 answers · asked by Anonymous

Ammonium nitrate is a common agricultural fertilizer, an ingredient in fireworks, and was one of the components of the bomb used in the terrorist attack on the federal building in Oklahoma City in 1995. How many liters of gas at 300° C and 1 atm are produced by the explosive decomposition of 12.0 kg ammonium nitrate to nitrogen gas, oxygen gas and water vapor.

2007-08-21 12:01:33 · 1 answers · asked by meisawesome 2

Christina has three substances. each substance is a cube with a volume of 6 milliliters she is going to place all three substances in a tub of water and wants to know which will float. substance A has a mall of 4 grams substance b has a mall of 8 grams and substance C has a mall of 10 grams .
which substance will float?
explain?

please help with my homework question i just dont get it i thought that the lightest thing would float but look at a safty pin and an apple the safty pin sinks and the apple floats.

2007-08-21 10:43:02 · 3 answers · asked by Anonymous

Sorry. I know I recently posted a question and believe me I am def. not trying to not do this homework assignment, its over 35 questions long and some of them are REALLY long (not just fill in the blanks) ..so I still have pleanty to do on my own.

If you want to dilute an acid, never add water to it, instead add
______ to _______-

2007-08-21 10:32:56 · 7 answers · asked by Anonymous

I have come across a math problem that I can't solve. The equation is: y/4z = x/w (Solve for: z)

2007-08-21 10:32:29 · 4 answers · asked by Anonymous

A diagram would be helpful. Any related information on protamine sulfate and its impurities and associated LC assay/impurity methods would be excellent.

2007-08-21 10:26:24 · 4 answers · asked by nascareer 1

Acid is similar to hot grease because when adding water to it the molecules heat up so rapidly (causing the molecules to seperate from each other at such a fast rate) an "e___" might result.

2007-08-21 10:19:30 · 7 answers · asked by Anonymous

2007-08-21 10:17:38 · 4 answers · asked by Truly Amazing 2

Seriously. I need to know.
Any ideas?

2007-08-21 10:14:43 · 7 answers · asked by Anonymous

My sister mixed soap together in my swimming pool. is the water still good? anything that can go wrong?

2007-08-21 10:13:53 · 2 answers · asked by levis 1

In distillation, one needs to condense the vapor being produced; therefore a condenser is used. Cold water is passed through the condenser. There two ways to allow the water the flow, concurrent and countercurrent. What is the difference between concurrent exchange and countercurrent exchange? Which method is more efficient? Explain.

2007-08-21 09:58:40 · 2 answers · asked by bucsfan5520 1

2007-08-21 09:26:30 · 2 answers · asked by Anonymous

The context is a company which provides security in metallurgy industry. I don't have any other tip!!!

2007-08-21 09:13:47 · 1 answers · asked by unicornius 1

I need it for chemistry. :(

2007-08-21 09:00:49 · 1 answers · asked by Anonymous

what happens to atoms during a chemical reaction?

Atoms do not take part in a chemical reation

they are destroyed

they are rearraned

they change into other atoms.

2007-08-21 08:47:03 · 7 answers · asked by Anonymous

In a Millikan oil drop type experiment, the charge on four oil drops (in Coulombs) was found to be:
3.33 Coulombs
8.88 Coulombs
6.66 Coulombs
11.10 Coulombs

A. 1.11 Coulombs
B. 2.22 Coulombs
C. 4.44 Coulombs
D. 11.10 Coulombs

2007-08-21 08:44:00 · 4 answers · asked by Vinny L 3

If there was a swimming pool with about 30 gallons of water in it, and a person put their hands in it after dipping it in tide bleach and dipped it in there 4 or 5 times would it effect it a lot???

2007-08-21 08:42:59 · 2 answers · asked by levis 1

A molecule of sulfuric acid is made of 2 hydrogen, 1 sulf and 4 oxygen atoms. When sulfuric acid molecule reacts with calcim hydroxide [1 calcium,2 oxygen and 4 hyrogen atoms] to produce water and clcium sulfate,how many sulfur will be present after the reation?

2007-08-21 08:41:38 · 4 answers · asked by Anonymous

if there are 2 atoms of oxygen and 4 atoms of hydrogen before a reaction what will be true after the reaction?


If there are 2 atoms of oxygen and 4 atoms of hydrogen after the reation

there will be 6 atoms after the reaction,but none of them will be hydrogen or oxygen

There could ne any number of atoms of any element after the reation

There could be any number of oxygen atoms and any number of hydgen atoms after the reation

2007-08-21 08:33:38 · 5 answers · asked by Anonymous

i'm in class and i need an answer now!

2007-08-21 08:18:50 · 3 answers · asked by Esa Chica 3

in chemistry

2007-08-21 07:46:17 · 5 answers · asked by Sailakshmi V 1

one of the principles of dalton's theory is that

the atom can be created in a nuclear reaction

the atom has an electron cloud

compounds are cominations of more than one type of atom

the atom contains positively and negatively changed particles

2007-08-21 07:39:52 · 3 answers · asked by fuffy6yrfy d 1