Chemistry - April 2007

Calculate the pH of a solution prepared by adding 115mL OF .100 M NaOH to 100mL of .100 M HNO3 solution.

I would appreciate that you explain the procedure.
Thanks in advance

2007-04-04 16:11:56 · 2 answers · asked by mazp66 3

I'm doing a report and i can't seem to find the information

this is what i need

Who found quarks?
When did they find quarks?
How did they find quarks?
The 6 types of quarks?

2007-04-04 15:47:11 · 4 answers · asked by Anonymous

a) The molar solubility of MgF2 at 25°C is 1.2E-3 mol/L. Calculate Ksp for this salt.

(b) If 0.049 mol of the slightly soluble salt C2A(s) (where "C" is the cation, "A" is the anion) dissolves in one liter of solution, calculate the solubility-product-constant for this salt.

(c) Using the appropriate Ksp value, calculate how many grams of AgCl will dissolve in one liter of water.
??? g/L

2007-04-04 15:36:49 · 2 answers · asked by Anonymous

In a lab experiment, a made ice cream by putting ice and salt in a gallon sized bag then inside that bag i placed a closed quart sized bag filled with milk and sugar. I shook it up for 12 minutes until it formed ice cream. Why did I add the salt to the ice and what did it do? Also, people put salt on the ice in the winter. How does this relate to the experiment above?

2007-04-04 15:35:50 · 2 answers · asked by baseballcooldude45 3

2007-04-04 15:32:05 · 1 answers · asked by sjsugiant 2

XH2O is heated. If 243.4400gms of hydrate releases 108.1201gms of water, what is the value of X in the hydrate formula. Molecular weight of the anhydrous compound is 405.97 g/mol

2007-04-04 15:31:04 · 2 answers · asked by sjsugiant 2

what is its molecular formula if the molecular weight is 417.45 g/mol?

2007-04-04 15:28:01 · 2 answers · asked by sjsugiant 2

an explanation of how you got the answer would be nice. thanks

2007-04-04 15:26:10 · 2 answers · asked by sjsugiant 2

an explanation of how you got the answer would be nice. thanks

2007-04-04 15:24:43 · 3 answers · asked by sjsugiant 2

2007-04-04 15:20:28 · 1 answers · asked by amber 1

Also, how does the density of Hg (15.6 g/mL) relate to the pressure of hydrogen if the atmospheric pressure was 746 torr?

thank you so much in advance!

2007-04-04 15:18:56 · 1 answers · asked by Julia C 2

I need to find the difference between ionic, covalent, and hydrogen bonds. && than find what is similiar about all of them.

PLEASE HURRY. My project is due tomorrow!!!!

2007-04-04 15:18:40 · 2 answers · asked by radioxrockstar 2

Thanks in advance.

2007-04-04 15:16:48 · 3 answers · asked by evenstar03 2

1) Which substance is a binary compound?
a) ammonia
b) argon
c) glucose
d) glycerol

2) How would the graph(the line)look like if it were to best represent the variation in the vapor pressure of water as temperature changes? (constant, inc., dec., etc...)

3) C3H8+5O2 (arrow to the right) 3CO2+4H2O
Which of these could be removed from the above reaction to increase the rate of reaction over time?
a) C3H8 & O2
b) C3H8 & CO2
c) O2 and CO2
d) CO2 and H2O

4) same as #3, but instead of removed, it's ADDED

5) Which process does random molecular motion explain?
a) How solids dissolve in liquids
b) how liquids evaporate
c) how solids melt
d) how precipitation forms

6) Sally adds a teaspoon of sugar to a cup of water. Over time the sugar dissolves and is distributed evely throughout the water. This occurs because of-
a) random molecular motion
b) uniform "
c) decreasing "
d) increasing "

7) How many hydroxide ions are needed to completely neutralize 1.0 L of 0.50 M HCl?
a) 1.5 x 10^23
b)

2007-04-04 15:14:55 · 1 answers · asked by eeyorecutie 2

A commerical brand of household ammonia was analysed to determine its ammonia content. 18.25g of the household ammonia was dissolved and diluted to 250ml. A 25ml portion of this solution required 23.8ml of 0.105molL-1 HCl for neutralisation.

Calculate the percentage of ammonia in the commercial household ammonia.

I got 4.8%, is this right?

2007-04-04 15:11:51 · 2 answers · asked by Anonymous

The coefficients of a balanced chemical equation indicate the relative number of _______ of the reactants and products. All stoichimetric calculations begin with a _______. Only ______ and ______ are conserved iin every reaction; moles, volumes, and representative particles may not be.

2007-04-04 15:07:42 · 3 answers · asked by Anonymous

I have a chemistry lab write-up due tomorrow. We had to construct an "air bag" using a plastic bag, sodium carbonate, and aceitic acid. One of our question is:
What amounts of reactants did you use? What volume of gas was generated?
We used 15 g of sodium carbonate and 20 ml aceitic acid. How would I find out how much gas was generated??


Thanks

2007-04-04 15:07:27 · 2 answers · asked by Jennifer 2

Would cathode/anode change? Why?

2007-04-04 15:00:29 · 1 answers · asked by Anonymous

2007-04-04 14:50:07 · 4 answers · asked by Hitmo 1

2007-04-04 14:47:34 · 7 answers · asked by sagegibbous 2

Can anyone give me a few interesting facts about silver for a science assignment? Silver as an element not jewelry..

2007-04-04 14:46:12 · 4 answers · asked by sharpie_sweetheart 2

When a substance solidifies it goes from the ______ phase to the ____ phase

2007-04-04 14:43:16 · 2 answers · asked by Anonymous

a)0.1 M HCN / 0.1 M KCN
b)0.01 M HCN / 0.01 M KCN

2007-04-04 13:52:49 · 1 answers · asked by V P 1

a type of chemical reaction in which 2 compounds react and the cation of one compound exchanges with the cation of the other compound is called a________reaction.

2007-04-04 12:58:59 · 11 answers · asked by Auby nobby 1

hydrogen-2 plus hydrogen-2 yields hydrogen-4
hydrogen-2 plus hydrogen-2 yields helium-4
hydrogen-1 plus hydrogen-1 yields hydrogen-2
hydrogen -1 plus hydrogen-1 yeilds helium-2

2007-04-04 12:57:37 · 2 answers · asked by William R 1

Science question,,,, I wasn't there when they had this question taken up,, and when it was teached,,,
science power 10 (by McGraw-Hill Ryerson), pag 244
section= Factors Affecting Chemical Reaction Rate,

2. In each part of this investigation, how did you know that a chemical reaction had occured?

4.Based on your conclustions, suggest least one reason why an automobile is more difficult to start in the winter.

4.What happens to the molecules in food when food is put in a refrigerator?

5.Why does kindling make it easier to start a fire?

9.Thinking Critically- Why are important artifacts, such as preserved body, stored under airtight, temperature-controlled conditions?

-Please answer these questions,,, even though i was gone to march break for 2week, my teachers wants answer for these questions, and i was gone so i donnot know, p

2007-04-04 12:42:12 · 2 answers · asked by Anonymous

What is the decomposition equation of sulfurous acid?

2007-04-04 12:36:43 · 3 answers · asked by grofazdt 1

How does this work? Am i just supposed to take the charge each one has and match it to the other, or is there something else?

It says : "Write the correct chemical formula for the compounds formed from each pair of ions:"

a. Zn2+ , SO42- _____________________

b. Na+ , CO32- _____________________

c. K+ , OH- ­­ _____________________

2007-04-04 12:36:06 · 1 answers · asked by -__ 3

The pressure of a 12.0L cntainer of gas increases from 25.0 k Pa to 105 k Pa, the tempeture does not change what's the new volume?

2007-04-04 12:09:11 · 1 answers · asked by xopink1x 1

Br2 + OH - BrO3- + Br - + H2O (in basic solution)

2007-04-04 11:59:50 · 2 answers · asked by mitch v 1