Thursday

July 24, 2014

July 24, 2014

Total # Posts: 431

**chemistry**

H-bonding is an intermolecular force that happens with electronegative atoms and H, namely nitrogen, fluorine, and oxygen. H-F H-N H-O

**Electrochemistry**

Qualitively explain the effect of changing concentration of Cu^2+ using your experimental observations and the Keq values below (no calculations required) Cu^2+(aq) + 4 NH3(aq) --> [Cu(NH3)4]^2+(aq) , Keq = 1.2x10^12 CuS(s) --> Cu^2+(aq) + S^2-(aq) , Keq = 8.5 x 10^-45 C...

**Electrochemistry**

Thanks for replying! Cu/Al For example, for the cell combination of Cu/Zn I got a voltage potential of 0.515V. So is this the cell potential? You didn't show your work here so I can't check it for cell potential. ^ I didn't do any work, that was the reading that th...

**Electrochemistry**

In lab, we did an experiment with electrochemical cells with solutions of ZnSO4, CuSO4, Al2(SO4)3 and MgSO4 and their respective metal electrodes. There are a couple of post-lab questions that I'm not sure about: (1) Summarize Part A with a data table containing the headin...

**Chemistry**

Oh, sorry, I meant Sr3(PO4)2. That's what I wrote down but I didn't type it properly.

**Chemistry**

For a reaction between sodium phosphate and strontium nitrate write out the following: a) The balanced molecular equation b) The ionic equation c) The net ionic equation a) I think I have this one: 2 Na3PO4 (aq) + 3 Sr(NO3)2 (aq) --> 6 NaNO3 (aq) + Sr(PO4)2 (s) b) Should I ...

**Chemistry**

You are carrying out the titration of 100.0 mL of 1.000M acetic acid with 1.000 M sodium hydroxide. Ka = 1.76x10^-5 of acetic acid. (a) Calculate the initial pH of your acetic acid sample. (b) Calculate the pH of the solution after the addition of 25.0mL of NaOH. For (a) shoul...

**mathematics**

If 3xy^3 - 4x = 10y^2, find y ' (x) a) (4 + 3y^2)/(9xy^2 + 20y) b) (4 - 3y^2)/(9xy^2 - 20y) c) (3 + 4y^2)/(20xy^2 + 9y) d) (3 - 4y^2)/(20xy^2 - 9y)

**physics!!!!!**

A small spherical insulator of mass 8.00*10^-2kg and charge +6.00*10^-7C is hung by a thin wire of negligible mass. A charge of -9.00*10^-7C is held 0.450m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical. Find (a) the angle an...

**physics!!!**

A small spherical insulator of mass 8.00*10^-2kg and charge +6.00*10^-7C is hung by a thin wire of negligible mass. A charge of -9.00*10^-7C is held 0.450m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical. Find (a) the angle an...

**Beginning Chemistry**

My granddaughter needs help with a worksheet. Use the factor-label method and include all work. Calculate the mass of 500.0cmx3 of the element gold.

**AP US History**

What was the name of the brillantly colored woven cotten cloth produced br the asante tribe wirn by african americans as declaration of their heritage?

**SCI**

I am a mom that works full-time with six kids. I am looking for help when I go to homework sites. You guys are idiots just because someone asks for help does not mean that they are cheating they just might need help. So if you are not going to help SCREW YOU !!!!!!! and if som...

**biology**

what object is like a cell

**art**

Marcel Duchamp.

**physics**

1. how much work do you do on a 25-kg backpack when you walk a horizontal distance of 100 m? -I got 2,500 J 4. if you friend pushes a lawnmower four times as far as you do while exerting only half the force, which one of you does more work? how much more? ( I dont understand t...

**Physics**

Can you please help me with the following questions? please. 1. how much work do you do on a 25-kg backpack when you walk a horizontal distance of 100 m? -I got 2,500 J 4. if you friend pushes a lawnmower four times as far as you do while exerting only half the force, which on...

**business math**

Consider a system of notebook computers for a college math laboratory. The set of computers costs $10,000 and will be salvaged for $2,000 at the end of a 3-year period. Prepare a depreciation schedule using a 150%-declining balance rate for the system. The depreciation schedul...

**Business Math**

Consider a system of notebook computers for a college math laboratory. The set of computers costs $10,000 and will be salvaged for $2,000 at the end of a 3-year period. Prepare a depreciation schedule using a 150%-declining balance rate for the system. The depreciation schedul...

**language**

I need to write a paragraph describing my utopian community. What is your ideal community? If you post your paragraph, we'll be glad to comment on it. Thank you for using the Jiskha Homework Help Forum. You only have to write ONE paragraph? Here's how to do that: Here&...

**chemistry**

Can someone please help me with this problem? An iron nail placed in a beaker with a solution of silver nitrate will cause pure silver to collect on the bottom of the beaker. Write a balanced equation for the reaction that occurs. This is what I have so far: Fe + AgNO3 --->...

**Could someone help me proofread?**

I think you should know that eggshell and teeth consist of quiet different chemical actually, eggshell is 94-97% Calcium carbonate while teeth is 98% Calcium Phosphate..Calcium phosphate (hydroxyapatite) react with fluoride and formed Fluoroapatite, which is stronger to acid t...

**Finance**

847.86

**Math Word Problem**

Todd has indigo, yellow, pink, and red flowers in his green house. The ratio of indigo flowers to yellow is 3 to 5. The ratio of yellow to pink is 2 to 4. The ratio of indigo flowers to red is 2 to 5. There are 6 indigo flowers. How many flowers of each color is Todd growing? ...

**Math**

The kingston parks and recreation dept. is planning a new that will be 100 yards long and 85 yards wide. The dept. recommended that the trees be planted along the perimeter of the park at equal distances from each other and as far apart as possible. How far apart can the trees...

**math**

when you say subtraction you minuis yes I think it's "minus"

**math**

what is 100.00 +1.002.00 Please check your problem. 1.002.00 is not a standard way of writing a number. We don't use two periods in a number. 1002.00 1002.00 + 100.00 = 1102.00

**Analogies (just one)-- please help**

place is to set as yield is to: protect obstinate retention capitulate

**brain teaser help**

50 states in the Union is 50 S in U I think

**Science**

Which trophic levels have the most biomass? Which have the most energy? Why? The second law of thermodynamics requires that the primary producers have the most biomass and total energy. See:http://www.physicalgeography.net/fundamentals/9o.html

**unscrambling word**

please help me to unscramble this saying! dare to believe. here are the letters chitogoarntoasurwayht the first word has 5 letters second has 4 third has 5 fourth has 2 fifth has 1 sixth word has 4. please help. please help me to unscramble this saying! dare to believe. here a...

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