Friday

October 24, 2014

October 24, 2014

Total # Posts: 400

**Chemistry **

1. Sodium can be extracted by heating naturally occurring salt until it is molten. An electrochemical process is then used to extract the sodium. Cl2 is produced at the anode, and Na is collected at the cathode. A standard reduction potential graph for the reaction is shown ...
*October 22, 2014*

**Chemistry **

3. An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is: Zn(s) → Zn2+(aq) + 2e− The cell potential for the reaction is Eºcell = 1.83 V. a. Is the reaction spontaneous or nonspontaneous? Explain. (1 ...
*October 22, 2014*

**Chemistry**

2. Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq) + 3e− Zn2+(aq) + 2e− → Zn(s) a. Predict the potential of the cell under standard conditions. (4 points) b. Predict whether the ...
*October 22, 2014*

**Easy chemistry **

Which statement correctly identifies how a lead-storage battery in a car works? A. The battery acts as a galvanic cell as it provides current to the radio. B. The battery acts as a galvanic cell as it is recharged by the alternator. C. The battery acts as an electrolytic cell ...
*October 22, 2014*

**Chemistry**

Which statement correctly identifies how a lead-storage battery in a car works? A. The battery acts as a galvanic cell as it provides current to the radio. B. The battery acts as a galvanic cell as it is recharged by the alternator. C. The battery acts as an electrolytic cell ...
*October 22, 2014*

**Chemistry **

How long (in minutes) must a 5.40 A current be passed through an aqueous solution of zinc nitrate to deposit 87.5 g Zn?
*October 20, 2014*

**Easy Chemistry **

How long (in minutes) must a 5.40 A current be passed through an aqueous solution of zinc nitrate to deposit 87.5 g Zn?
*October 20, 2014*

**chemistry**

Which of the following half-reactions would occur at the anode of an electrochemical cell? A. H+(aq) + Cl− (aq) → HCl(aq) B. Li+(aq) + e− → Li(s) C. Cu+(aq) + e− → Cu(s) D. Cu(s) → Cu+(aq) + e−
*October 20, 2014*

**chemistry**

Why are half-reactions used in redox reactions? A. They make it easier to keep track of spectator ions in the reaction. B. They make it easier to see the oxidation and reduction parts of the reaction separately. C. They make it possible to neglect the electrons that are being ...
*October 20, 2014*

**chemistry**

What is the difference between a galvanic cell and an electrolytic cell? A. A galvanic cell converts reduction reactions into an electrolytic cell, and an electrolytic cell converts oxidation reactions into a galvanic cell. B. A galvanic cell converts oxidation reactions into ...
*October 20, 2014*

**Chemistry**

I think the answer is a or b am I correct.
*October 20, 2014*

**Chemistry**

I think the answer is a or b am I correct
*October 20, 2014*

**Chemistry**

well my chemistry book only goes over how to balance the equation and I know Ag is reduced but I don't know what will happen if I increase the about of Ag. DrBod222
*October 20, 2014*

**Chemistry**

The following galvanic cell at standard conditions has a potential of 0.03 V: Ag+(aq) + Fe2+(aq) → Fe3+(aq) + Ag(s). What would be the effect of increasing the concentration of Ag+? A. The cell potential will decrease. B. The cell potential will increase. C. The cell ...
*October 20, 2014*

**Chemistry **

The following galvanic cell at standard conditions has a potential of 0.03 V: Ag+(aq) + Fe2+(aq) → Fe3+(aq) + Ag(s). What would be the effect of increasing the concentration of Ag+? A. The cell potential will decrease. B. The cell potential will increase. C. The cell ...
*October 20, 2014*

**Easy Chemistry **

What is the oxidation half-reaction for Mg(s) + ZnCl2(aq) MgCl2(aq) + Zn(s)? A. Zn(s) Zn2+ + 2e- B. Zn2+ + 2e- Zn(s) C. Mg(s) Mg2+ + 2e- D. Mg2+ + 2e- Mg(s)
*October 20, 2014*

**Easy Chemistry **

Which of the following processes uses a galvanic cell? A. Electroplating silver metal onto a teapot B. Purification of metals such as copper from their metal ores C. Electrolysis of sodium chloride D. Operation of a portable music player
*October 20, 2014*

**math**

Find the angle, in degrees, between two adjacent sides of the pyramid. P(2, 0, 0), Q(2, 2, 0), R(0, 2, 0), (base points) S(1, 1, 7) (tip point)
*October 17, 2014*

**math**

Find the distance between the point and the plane. (2, 5, 3) 3x + 2y – 3z = –6
*October 17, 2014*

**math**

Find the general form of the equation of the plane passing through the point and perpendicular to the specified vector. [Be sure to reduce the coefficients in your answer to lowest terms by dividing out any common factor.] (8, 6, 3), n = i – 6j + k
*October 14, 2014*

**math**

thank you steve
*October 14, 2014*

**math**

In a suspension bridge, the shape of the suspension cables is parabolic. The bridge shown in the figure has towers that are 400 m apart, and the lowest point of the suspension cables is 100 m below the top of the towers. Find the equation of the parabolic part of the cables, ...
*October 14, 2014*

**chemistry**

A carbonate ion, CO32−, can participate in an acid-base reaction. How should the carbonate ion be classified?
*October 13, 2014*

**chemistry/math**

5.0 moles of solid sodium chloride (NaCl) are used to prepare a 5.0 M NaCl solution. What is the volume of the solution?
*October 13, 2014*

**chemistry**

How many moles of magnesium chloride are formed when 55 mL of 0.70 M HCl is added to 42 mL of 1.204 g Mg(OH)2? Mg(OH)2(s) + 2HCl(aq) MgCl2(aq) + 2H2O(l) A. 0.019 mol B. 0.012 mol C. 0.021 mol D. 0.039 mol
*October 13, 2014*

**Math**

a. y=4x y=2x+10 b. six classes It costs $24 c. Being a member cost is more effective when you go to more than six classes a month.
*October 13, 2014*

**pre calc**

(-9x^3-6x^2-x+3)/(2x^2+5x+2) I have figured out the equation for the slant asymptote = (33/4)-(9x/2) but this next ? is throwing me off. I have tried graphing and everything and it doesnt seem to work. What is the smallest value of x at which f(x) intersects its non-vertical ...
*October 8, 2014*

**Finance**

Interest rates on 2-year Treasury securities are currently 5.00%, while 5-year Treasury securities yield 10.00%. If the pure expectations theory is correct, what does the market believe that 3-year securities will be yielding 2 years from now?
*October 5, 2014*

**pre-calc**

a semicircle of radius r=3x is inscribed in a rectangle so that the diameter of the semicircle is the length of the rectangle 1. express the area A if the rectangke as a function 2 express the perimeter P of the rectamgle as a function of x
*October 3, 2014*

**math**

Write the first six terms of the arithmetic sequence with the given properties. a = 3, d = 2 a. 3,8,13,18,23,28 b. 3,5,7,9,11,13 c. 3,6,8,10,12,14 d. 2,7,12,17,22,27 e. 2,4,6,8,10,12
*October 1, 2014*

**3rd garde math**

The Answer is 144.
*October 1, 2014*

**Math**

I am going to start with the slope-point form. y-y1=m(x-x1) y-8=-2x-(-2) or y-8=-2x +2 now you add 8 to both sides to get slope intercept form y=-2x+10
*October 1, 2014*

**math**

Write 4 names for 8? This is 2nd grade homework.
*September 28, 2014*

**CONTRACT LAW**

A music club sends an advertisement. you select ten "free" downloads and agree to become a member. When you get you free downloads you decide to resign. Does the night club have an legal rights against you? why? I know that they don't have rights I just cant ...
*September 18, 2014*

**algebra**

x=5(a+g)
*September 11, 2014*

**chemistry **

a) Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine, phosphorus pentachloride...
*September 10, 2014*

**Language Art!**

I believe c is the best answer.
*September 10, 2014*

**Math**

The answer is 24 days.
*September 10, 2014*

**algebra**

21.99x -7.94x =y 14.05x=10530 divid each side x = 750 (the rounded to the next whole number)
*September 10, 2014*

**Math**

if r = 4 than you got this answer correct. Congrats.
*September 10, 2014*

**math**

35 1/2 divided by 1 1/4 then 27 1/5 divided by 4/5 For the blue car the answer is 28.4. For the red car the answer is 34.
*September 10, 2014*

**math**

For starters, there are three twenty minute sections in an hour. SInce there are 24 hours in a day you multiply 24 by 3, which is 72. Now you have to write a formula. You know that the sequence is 1,2,4,8 and so on. The equation is the amount of bacterium = 2^number -1 So the ...
*September 10, 2014*

**Chemistry **

a) Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine, phosphorus pentachloride...
*September 10, 2014*

**math**

convert 2 meters to centimeters 2×______=_____cm
*September 10, 2014*

**Chemistry**

a) Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine, phosphorus pentachloride...
*September 10, 2014*

**Chemistry**

a) Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine, phosphorus pentachloride...
*September 10, 2014*

**math**

There are 2 cups of juice in 7 serving so you have to divide 2 by 7. Answer: 0.286 cups.
*September 10, 2014*

**Science**

I think its C
*September 9, 2014*

**Science**

The active sections that are located along fault lines are called A. stress accumulations. B. recurrence gaps. C. seismic gaps. D. seismic risks.
*September 9, 2014*

**Science!**

Which of the following is not a process of a stream load? A. Suspension B. Bed Load C. Materials in solution D. Divide Im thinking D but also C?
*September 8, 2014*

**Honors Pre Calculus**

Verify the trigonometric identity:￼ ￼(1+sin x)/ (1-sinx)^2=￼(1+sin x)/[cos x] Hint: [cos x] means the absolute value of cos x
*September 3, 2014*

**Honors Pre Calculus**

Verify the trigonometric identity:￼ ￼(1+sin x)/ (1-sinx)=￼(1+sin x)/[cos x] Hint: [cos x] means the absolute value of cos x
*September 3, 2014*

**Honors Pre Calculus**

Tony visits the local fair and sees one of the rides, the ferris wheel. The ferris wheel has a diameter of 50 feet and is on a platform of 4 feet. If it takes 12 seconds to make one full revolution, what is the equation of the height of a person on the ferris wheel at any time t?
*September 3, 2014*

**Accounting **

What is the journal entry for a $10,000 deposit in exchange for $10,000 worth of common stock ? Would I name that account common stock or cash ? Thanks!
*August 28, 2014*

**College Algebra**

You wish to fence a circular garden of area 70 square meters. How much fence do you need?
*July 25, 2014*

**Trig**

The problem is: an airplane is flying in the direction 120 degrees with an airspeed of 320 mph, and a 35 mph wind is blowing in the direction 60 degrees. The question ask to find the true course and the ground speed. To solve the problem I have done this: Flying 120sin 320_+...
*June 2, 2014*

**chemistry**

By titration it is found that 20.5 mL of 0.168 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution
*April 27, 2014*

**chemistry**

By titration it is found that 20.5 mL of 0.168 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution
*April 27, 2014*

**algebra**

A tailgater
*April 24, 2014*

**Math**

I need help with 12 over 25 times 10 over 14 times 7over 18 and then putting it into simplest form
*April 15, 2014*

**Math**

What is the pattern for 2,6,4,12,10,30,28
*March 26, 2014*

**Probability**

According to the record of the registrar's office at a state university, 40% of the students are freshman, 25% are sophomore, 20% are junior, and the rest are senior. Among the freshmen, sophomores, juniors, and seniors, the portion of students who live in the dormitory ...
*March 16, 2014*

**Geometry**

Christopher wants to determine how far away a helicopter is from where he is standing. He knows the helicopter is sitting on the edge of a roof of an apartment building that is 400 feet high and 1,050 feet from where he is standing. Using the information in the drawing, ...
*March 16, 2014*

**Probability - Math**

According to the record of the registrar's office at a state university, 35% of the students are freshman, 25% are sophomore, 16% are junior, and the rest are senior. Among the freshmen, sophomores, juniors, and seniors, the portion of students who live in the dormitory ...
*March 13, 2014*

**accounting**

Richard Hamilton has a fast - food franchise and must pay a franchise fee of $35000 plus 3% of gross sales. In terms of cost behavior, the total cost is a: a) variable cost b) fixed cost c) step - fixed cost d) mixed cost
*February 23, 2014*

**Accounting**

An example of a committed fixed cost would be: a) taxes on real estate b) management development programs c) public relations d) advertising programs
*February 23, 2014*

**Chemistry**

Carbon monoxide and chlorine gas react to form phosgene: CO(g)+Cl2(g)⇌COCl2(g) Kp = 3.10 at 700 K If a reaction mixture initially contains 319torr of CO and 220torr of Cl2, what is the mole fraction of COCl2 when equilibrium is reached?
*February 16, 2014*

**Physics**

2.30s
*February 5, 2014*

**algebra**

If shorter boards are cut from one long board, how many cuts will it take to have 12 shorter boards if there is no waste left?
*December 1, 2013*

**Math**

If $1500 is invested at an interest rate of 3.5% per year, compounded continuously, find the value of the investment after 3 and 6 years. What formula would i use?
*November 19, 2013*

**Physics**

How far vertically does it move? What is the final mechanical energy (the sum of U and the two types of K)? What, then, was the initial mechanical energy? What is the rotational inertia (see Table 10-2)? How is the angular speed related to the com speed?
*November 17, 2013*

** chemistry **

a student was asked to prepare 100.0 mL of 0.0200 M solution of HCL from 0.400 M solution of HCL. in order to do this he measured 5.0 mL of 0.400 M HCL with a graduated cylinder, transfered this amount to a 100 mL beaker, added 95 mL of deionized water measured with a ...
*November 12, 2013*

**algebra 1**

a number is less than one fourth of the sum of three times the number and four. can someone please explain to me how they got this answer and can someone please show me each step.
*November 10, 2013*

**Economics**

The purpose of advertising & other forms of non-price competition by a firm is to shift the Demand curve to the A)Right B)Left & A)Make it more elastic B)Make it more inelastic What is the reason behind the answer?
*October 30, 2013*

**chemistry**

to get the grams of NaClO in the titrated bleach sample I calculated .000721 x 74.44217 = .0536 which was correct. For the previous question I asked I put in the same answer as you said and it is incorrect.
*October 27, 2013*

**chemistry**

use this to get the mass of the bleach? It is telling me my answer is incorrect.
*October 27, 2013*

**chemistry**

5 mL of undiluted bleach was used. Calculate the mass in grams of undiluted bleach that was in the sample of bleach titrated.
*October 27, 2013*

**chemistry**

one last question. From same set up. Assuming all of the hypochlorite ion comes from sodium hypochlorite, calculate the grams of NaClO in the titrated bleach sample.
*October 27, 2013*

**chemistry**

thank you
*October 27, 2013*

**chemistry**

sorry this is for a prelab. But yes.
*October 27, 2013*

**chemistry**

Suppose a student diluted and titrated a bleach unknown. A single titration was performed which required 14.42 mL of 0.100 M Na2S2O3. The density of the original, undiluted bleach unknown was 1.042 g/mL. calculate the number of moles of ClO- in the sample titrated.
*October 27, 2013*

**Microeconomics**

Why do "price-maker" firms never want to produce in the inelastic part of the demand curve??
*October 25, 2013*

**Algerbra **

These problems I really don't understand and really need serious help :) 1.What the product of (5.1 x 10^3)x (3.2 x 10^3)?(Please express your answer in scientific notation) 16.32 x 10^6 1.632 x 10^7 16.32 x 10^9 1.632 x 10^10 2.What is the product of (7.28 x 10^-2)x(9.1 x...
*October 23, 2013*

**Math**

These problems I really don't understand and really need serious help :) 1.What the product of (5.1 x 10^3)x (3.2 x 10^3)?(Please express your answer in scientific notation) 16.32 x 10^6 1.632 x 10^7 16.32 x 10^9 1.632 x 10^10 2.What is the product of (7.28 x 10^-2)x(9.1 x...
*October 22, 2013*

**chemistry **

DrBob222 - it says my answer should be a number.
*October 20, 2013*

**Chemistry**

THANK YOU!!!!
*October 20, 2013*

**Chemistry**

50.0mL of 1.04moles HA is added to 50.0mL if 0.90moles NH4OH.With a 1:1 stoichiometric ratio. What is the limiting reactant in moles of this reaction.
*October 20, 2013*

**Math**

week 3
*September 24, 2013*

**English**

I have to write a thesis paper with the main, broad idea being the similarities and differences between The Epic of Gilgamesh and Toy Story. I have no idea what the connections, or lack thereof, are between the two.
*September 5, 2013*

**Math**

How do I solve b+12<31 using an inverse operation?
*August 20, 2013*

**Chem**

H. Using the technique outlined in this lab, a student decided to test wastewater for the presence of phosphate. The first reading produced an extremely dark blue color and a concentration higher than 3ppm. After performing a 10 ml dilution, the colorimeter measured a ...
*July 14, 2013*

**Chemistry**

If the solubility of CaF2 (s) in water is 5.0 x 10^-3. The solubility will be A. The same in 0.10 M NaF B. less than 0.10 M NaF C. Higher in 0.10 M NaF D.None of the above
*July 10, 2013*

**Chemistry**

If the solubility of CaF2 (s) in water is 5.0 x 10^-3 M. The solubility will be
*July 10, 2013*

**Calc**

A street light is at the top of a 16ft tall pole. A woman 6ft tall walks away from the pole with a speed of 6ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30ft from the base of the pole?
*June 18, 2013*

**Calculus**

Correction: If the ladder makes an angle 1.25 radians with the ground, touches the top of the fence, and just reaches the wall, the distance along the ladder from the ground to the top of the fence=? The distance along the ladder from the top of the fence to the wall is=?
*June 18, 2013*

**Calculus**

A fence 3 feet tall runs parallel to a tall building at a distance of 3 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building. Answer the following: The distance along the ladder to the top ...
*June 18, 2013*

**Calculus**

Thank you for your help!
*June 18, 2013*

**Calculus**

Find the point on the line 4x+3y-4=0 which is closest to the point (5,2)
*June 18, 2013*

**Math**

What is 538 divided by -63
*April 22, 2013*

**personal finance**

Jo owns 150 shares of Delta General stock. She purchased the stock for $24 a share. She sold the stock for $30 per share. The commissions required to buy and sell her stock cost her $120. Assuming that she received no dividends (income) during the time she owned the stock, ...
*April 14, 2013*