Chemistry - January 2007

So I just did an experiment at school today. I took 10 mL of water and 10 mL of alcohol and put them both in a test tube. I noticed that when they both combined it was only 18.5 mL and not 20. interesting, yea?and I noticed that the test tube got a little warmer when I touched it and little tiny "liquid" bubbles were in the test tube now.can anyone give me a detailed explanation as to why liquid bubbles form anyway? this experiment/solution was not boiling water so that can't be the solution.so why then just by simply adding some water and some alcohol in a test tube, some liquid tiny particle bubbles form? please and thanks in advance.I'm really curious.

2007-01-22 11:53:29 · 3 answers · asked by Ask this girl 5

just answer these questions. (u dont need to answer both)


wat affect does observing a substance's physical properties have on a subsnce?


why is burning a chemical change in wood?

2007-01-22 11:39:26 · 5 answers · asked by awesomegal 4

I need to know for a Science thing

2007-01-22 11:38:50 · 3 answers · asked by gossipgirl<3 1

a. decomposition of copper(II) oxide
b. copper and silver nitrate (displacement; copper (II) compound formed.
c.magnesium and oxygen (synthesis)
d. hydrochloric acid and silver nitrate (double displacement)
e. magnesium plus hydrochloric acid (displacement)
f. iron and oxygen (synthesis; iron (III) compound is formed)
g. iron and sulfur (synthesis; iron (II) compound is formed)
h. calcium hydroxide and sulfuric acid (single displacement)
i. zinc and sulfuric (single displacement)
j. benzene (C6H6) and oxygen (combustion reaction)
k.octane (C8H18) and oxygen (combustion reaction)

2007-01-22 11:25:38 · 2 answers · asked by San Fran Kid 2

I need to know why it will using the pH level.Another thing,Is Coke an acid and is that why?

2007-01-22 11:11:03 · 7 answers · asked by Lori L 1

68) write formula for each compound
A)aluminum carbonate
B)silicon dioxide
C)potassium sulfide
D) manganese(II)Carbonate
E) sodium bromide
On these, please help me answer these, the points beome very helpful in chemistry class. Thank you for your time! dont have to answer these, but if you do, i will help vote for YOUR answers on the questions uve answered!
52)4Zn(s) + 10HNO3(aq)>>>4Zn(NO3)2 (aq) + NH4NO3(aq) +3H2O(l)
A)How many atoms of zinc react w/1.49gHNO3?
B) calc the # of grams of zinc that must react w/an excess of HNO3 to form 29.14g NH4NO3
1) 3NO2 (g) + H2O (l)>>>NO (g) + 2HNO3(aq) . How many mol of water are needed to react w/8.4 mol NO2?
2) P4(s) + 6F2 (g)>>4PF (g) . how many grams of fluorine are needed to react w/6.20 g of phosphorus?

2007-01-22 10:55:22 · 1 answers · asked by truckin_90 2

As the title asks, what is the difference between temperature and heat?
Please just give any possible answers, thank you :D

2007-01-22 10:55:11 · 5 answers · asked by arbalest30 1

2007-01-22 10:52:02 · 2 answers · asked by gst 1

A 15-g sample of lithium is reacted with 15 g of fluorine to form lithium fluoride: 2Li + F2 -->2LiF. After the reaction is complete, what will be present?

2007-01-22 10:40:05 · 1 answers · asked by Anonymous

Naturally occurring copper exists in two isotopic forms: 63Cu and 65Cu. The atomic mass of copper is 63.55 amu. What is the approximate natural abundance of 63Cu?

2007-01-22 10:37:57 · 2 answers · asked by Anonymous

All I know is Dmitri Mendeleev organised his by atomic mass

2007-01-22 10:37:54 · 4 answers · asked by Anonymous

2007-01-22 10:29:48 · 12 answers · asked by ValGal 1

When 13.98 mL of HCL of unknown concentration (but less than that of a the base) are reacted with 15ml of 3.07 M NaOH, 2.08 kJ of heat are released. From these experimental data, calculate the molarity of the HCL solution.

2007-01-22 10:22:10 · 2 answers · asked by nitral2344 1

I know that element 43 (Technetium) is synthetic, but how is that possible? It is right in the middle of the periodic table. Aren't all elements one through ninety-two natural?

2007-01-22 10:20:42 · 1 answers · asked by Anonymous

As you no doubt know I've been having trouble finding an answer to this question. Since potassium is highly concentrated in cells, and the cell is 70% water, the form of potassium in food should be ionic potassium (K+). When you eat food the cells of the food go through digestion releasing the potassium ions. Even if we assume al-f minerals are mineral salts or chelate form, the al-f minerals would detach and pH coincidentally or not coincidentally would still increase. Al-f minerals are called al-f minerals becuase they increase pH. What do al-f minerals do in the body that causes pH to increase? KOH does not increase pH as you and other have explained. Please explain only in terms of human body chemistry. If yahoo answers format limits your answer, write me at ZinaZ@usadatanet.net

2007-01-22 10:17:26 · 2 answers · asked by Lisa 1

What are some of the scientific uses of viscosity?

God Bless,
Elisha

2007-01-22 10:17:15 · 2 answers · asked by Elisha 3

What solid product do HCl and Magnesium form?

2007-01-22 10:16:11 · 2 answers · asked by untilyoucamealong04 3

38) equation: CO(g) +2H2 (g) >>CH3 OH (g)
B) calc the # of grams of each reactant needed to make 4.0mol CH3OH
C) how many grams of hydrogen are necessary to react w/2.85mol CO?
52)4Zn(s) + 10HNO3(aq)>>>4Zn(NO3)2 (aq) + NH4NO3(aq) +3H2O(l)
A)How many atoms of zinc react w/1.49gHNO3?
B) calc the # of grams of zinc that must react w/an excess of HNO3 to form 29.14g NH4NO3
68) write formula for each compound
A)aluminum carbonate
B)silicon dioxide
C)potassium sulfide
D) manganese(II)Carbonate
E) sodium bromide

1)3NO2 (g) + H2O (l)>>>NO (g) + 2HNO3(aq) .How many mol of water is needed to react w/8.4 mol NO2?
2)P4(s) + 6F2 (g)>>4PF (g) .How many grams of fluorine is needed 2 react w/6.20g of phosphorus?
4)according to the balanced equation for the combustion of ethane, C2H6, 2C2H6(g) + 7O(g)>>4CO2(g) + 6H2O(l), for every molecule of ethane that reacts, CHOOSE RIGHT ANSWR:
(A)2 molecules of carbon dioxide r produced (B) 3 molecules of water is produced (C)A&B D)neither

2007-01-22 10:12:15 · 1 answers · asked by truckin_90 2

-aqueous zinc hydroxide reacts with aqueous phosphoric acid to form aqueous zinc phosphate and water
-iron(III) chloride reacts with aqueous calcium hydroxide to form Iron(III) hydroxide and solid calcium chloride
-aqueous silver nitrate reacts with solid copper to form aqueous copper(II)nitrate and solid silver
-aqueous sodim sulfide reacts with aqueous cadium nitrate to form solid cadium sulfide and aqueous sodium nitrate
-sodium cyanide reacts with aqueous sulfuric acid to form hydroxide cyanide gas and aqueous sodium sulfate
-aqueous barium chloride reacts with aqueous potassium carbonate to form a precipitate of barium cabonate and aqueous potassium chloride
-solid iron(II) sulfide reacts with aqueous hydrochloric acid to form hydrogen sulfide gas and aqueous iron (II) chloride
-liquid heptane (C7H16) is burned and produces carbon dioxide and water as the products

2007-01-22 10:10:53 · 3 answers · asked by Anonymous

use the appropriate noble gas,inner-core abbreviations

2007-01-22 09:54:50 · 3 answers · asked by katrina g 1

2007-01-22 09:48:53 · 4 answers · asked by chiocca2001 1

calculate the amount of heat ( in kilojoules ) required to convert 74.6 g of water to steam at 100 C??

2007-01-22 09:46:31 · 2 answers · asked by mazoqo 1

Can you guys help me answer this question or give me a link to a website that might help?
Thank you so much for helping!

2007-01-22 09:37:06 · 8 answers · asked by ily 2

Mg + 2HCl --> MgCl2 + H2
What is the type of reaction that took place?

2007-01-22 09:15:30 · 2 answers · asked by untilyoucamealong04 3

can you tell me 4 examples of ionic compound used in our household?

2007-01-22 09:11:35 · 3 answers · asked by Anonymous

What is a balanced equation of the reaction between HCl and Magnesium?

2007-01-22 09:01:48 · 2 answers · asked by untilyoucamealong04 3

2007-01-22 08:55:19 · 2 answers · asked by god 2

what has the ability to:
1.change into a new substance with different properties

2.dissolve in another substance

3. transfer heat is

copy and paste it or write the #
10 POINTS!

2007-01-22 08:45:31 · 3 answers · asked by ♥Roberta. 5

2007-01-22 08:41:53 · 5 answers · asked by kac3937 2

in the test for carbon dioxide, the white insoluble product is calcium carbonate. water is also produced. write a word equation for this reaction.

2007-01-22 08:32:47 · 2 answers · asked by Guitr Playrrr 2