vic
Most popular questions and responses by vic
Chemistry
A colourless solution contains one type of ion. When one adds dilute HCl to it, a white precipitate initially forms. However, once more of the HCl solution is added, the precipitate dissolves. Explain why the ion is Pb2+ and not Al3+, Hg22+, Cu2+ nor Ag+.
asked on September 3, 2007 
Physics
A 10.newton force is required to hold a stretched spring 0.20 meter from its rest position. What is the potential energy stored in the stretched spring?
asked on January 23, 2013 
Chemistry
Why is CH3I have a higher boiling point than CH3Cl? I thought, since Cl is more electronegative, it withdraws more electron density to its part and hence increase dipole movement within the atom and hence, requiring more energy to split them up and that
asked on August 24, 2007 
Chemistry Someone please help ASAP PLEASE
A compound contains 38.7% K, 13.9% N, and 47.4% O by mass. What is the empirical formula of the compound?
asked on January 24, 2013 
Business Math
What will be the total deduction for social security and Medicare taxes on Rony's next semimonthly paycheck of $3,960.00, if she has already earned $42,560.00 this year? (Social security tax is 6.2% of gross wages up to $106,800. Medicare tax is 1.45% of
asked on October 17, 2015 
chemistry
What is dipole moment of BeCl2? and hybidization?
asked on December 6, 2007 
math problem solving
rachel jogged along a trail that was 1/4 of a mile long. she jogged along the trail 8 times. how many miles did rachel jog in all?
asked on January 22, 2015 
Chemistry
50mL of 0.1M HCl is mixed with 50mL of 0.1NaOH. delta T = 3^oC. Calculate the enthalpy of neutralization per mole of HCl. assume the specific heat capcity of the solution is 4.18J/g/C and density=1.0g/mL. I tried it but got the wrong answer. What I did was
asked on August 10, 2007 
Business Math
You are the manager of World Wide Athlete, a chain of six sporting goods shops in your area. The shops sell 12 racing bikes per week at a retail price of $679.99. Recently, you put the bikes on sale at $599.99. At the sale price, 15 bikes were sold during
asked on October 2, 2015 
Chemistry
1.0L of aqueous solution in which [H2CO3]=[HCO3^]=0.10M and has [H^+]=4.2E7. What is the concentration of [H^+] ofter 0.005 mole of NaOH has been added? H2CO3 ==> H^+ + HCO3^ k1 = (H^+)(HCO3^)/(H2CO3) I don't know if you are supposed to calculate or to
asked on August 7, 2007 
math
Write two subtraction equations to show how to find 157
asked on October 5, 2016 
Business Math
The weekly payroll of Abkar Hardware includes 19 employees who earn $280.00. How much is the employer's share of total social security and Medicare taxes for the first quarter of the year?
asked on October 17, 2015 
Chemistry
Calculate the hydronium ion concentration in 50.0 mL of 0.10M NaH2AsO4. and we are given K1 = 6.0E3, K2 = 1.1E7 and K3 = 3.0E12 I assumed these K values where given in respect to the Ka of acid H3AsO4. (H^+) = sqrt[(k2(H2AsO4^2)+Kw)/1+(H2AsO4^2/k1)] I
asked on August 5, 2007 
Chemistry
How can you find out how many unpaired electrons are present in gaseous Co3+ ion in its ground state? According to the NBS Circular 467 "Atomic Energy Leves", Co(3+) has 24 electrons with structure 1s(2), 2s(2), 2p(6),3s(2), 3p(6), 3d(6), and spectroscopic
asked on August 3, 2007 
Inorganic Chemistry
Which aqeuous solution has a freezing point closest to that of 0.30M C12H22O11? A) 0.075M AlCl3 B) 0.15M CuCl2 C) 0.30M NaCl D) 0.60M C6H12O6 I know the answer but I don't know the reason or rationale behind it. Please explain. I suggest you review
asked on August 5, 2007 
Business Math
The last semimonthly payroll of Garcia Carpentry was $84,248 of gross wages for 38 employees. The company pays 5.2% of payroll for vacations and sick leave and $72.22 per employee for health insurance. What percent of payroll is the total cost of fringe
asked on October 17, 2015 
Business Math
You are the manager of World Wide Athlete, a chain of six sporting goods shops in your area. The shops sell 12 racing bikes per week at a retail price of $679.99. Recently, you put the bikes on sale at $599.99. At the sale price, 15 bikes were sold during
asked on September 28, 2015 
Algebra
Insert five arithmetic means between 7 and 17.
asked on April 14, 2019 
Math
Jennifer plans to fence a rectangular area around her rectangular swimming pool. The total area enclosed by the fence, including the pool, should be 5 times the area of the pool alone. The pool is 20 feet by 17 feet. A.)What is the total area enclosed by
asked on November 19, 2012 
Physics
A boat weighing 9.0 × 10 2 newtons requires a horizontal force of 6.0 × 10 2 newtons to move it across the water at 1.5 × 10 1 meters per second. The boat’s engine must provide energy at the rate of
asked on January 23, 2013 
Chemistry
Which clusters of orbitals would form a "octahedral" electron geometry and would also be possible within the valence shell of an atom?
asked on May 2, 2014 
physics
a person whos mass is 102 kg stands on a beam supported by two ropes , A and B, he is standing on one foot to help you solve this problem.
asked on October 26, 2009 
math
an observer is standing 200 meters from a hot air ballon, when is rising vertically at constant rate of 4m/sec. how fast is the angle of elevation changing 30 seconds after launch?
asked on March 9, 2010 
Chemistry
Why is sulfur dioxide (SO2) a better reducing agent than carbon dioxide (CO2) or nitrogen dioxide (NO2)? I really don't know how to answer your question. It's much like asking why the sky is blue, etc. You can look up the reduction potentials of SO2 vs CO2
asked on August 17, 2007 
Statistics
The time it takes me to wash the dishes is uniformly distributed between 11 minutes and 17 minutes. What is the probability that washing dishes tonight will take me between 12 and 14 minutes? Give your answer accurate to four decimal places.
asked on May 15, 2016 
math
the difference of y and 3 amounts to 12. Write each sentence as an equation
asked on January 16, 2013 
Math
Maria is three times as old as her brother.In 4 years,Maria will be twice as old as he will be then.How old is Maria's brother now?
asked on September 22, 2011 
physics
calculate the free electrons of a copper wire having a 0.064 inches diameter and 1000 ft. long?
asked on January 20, 2011 
Calculus
Farmer Jones has 480 feet of fence. She wishes to construct a rectangular pen divided into five separate pens, with one of the pens twice as large as each of the other four (see figure). She must use part of her 480 feet of fencing material to make the
asked on May 12, 2014 
Chemistry (Inorganic)
Given the two substances Sodium Nitrate (NaNO3) and Urea ([NO2]2CO), why is it that urea has a lower boiling point? I thought that the nitrate would because urea has the double bond which makes it more stable. Urea is covalently bonded. NaNO3 is an ionic
asked on July 29, 2007 
english
The tried and true methods quite often can't be beat.
asked on May 8, 2013 
chemistry
a 250.0 ml sample of an aqueous solution at 25 degrees celsius contains 35.8 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 11.25 mmHg, what is the molar mass of the unknown compound? I know you need to have the answer
asked on September 30, 2012 
Math
How to write a recursive rul for sequences. ex.) 1,3,4,7,11
asked on December 14, 2010 
Chemistry
Why does the addition of 50ml of 0.5M NaOH to 50mL of 0.6M KOH cause the pH to decrease (aka more acidic)? Because you have reduced the (OH^) of the 0.6 M KOH by adding an equal volume of 0.5 M NaOH 50 mL x 0.6 M KOH = 30 millimols. pH = 13.78 Adding 50
asked on August 21, 2007 
Chemistry
The output of a diesel generator, which contains a mixture of CO2 and H2O gases, is collected in a sealed vessel at 447 K. As the mixture cools to 298 K, the pressure falls from 3.0 atm to 0.80 atm. What is the ratio of CO2 to H2O in the mixture? Have you
asked on July 22, 2007 
CHEMISTRY
Determine the numbers of liters of oxygen required to oxidize 46 g of carbon to make carbon monoxide at STP?
asked on May 19, 2014 
calculus
Suppose you know that a population,P, of termites is growing continuously in an exponential manner. (Use the formant P=P0e^kt) If the pest control service estimates that the number of termites will double in 6 months... A) Determine the monthly continuous
asked on September 25, 2013 
math
the quotient of four and the sum of a number and one. Use x to represent each unknown number
asked on January 16, 2013 
Math
an estate was divided Among three heirs. After Andrea received 20% of the estate, her mother received 50% of what remained, leaving $20,000 for Andreas uncle. what was the total value of the estate?
asked on November 13, 2011 
math
during two hours at one area high school there are 3 class changes and two class periods. if the time spent in class is six less than six times the time spent changing classes, how long are the classes at this high school?
asked on January 6, 2012 
Math
The sum of 25 consecutive integers is 1000. What is the smallest integer used as an addend.
asked on September 29, 2011 
math
If 3/8 of the class was absent what % of the class was present?
asked on February 8, 2011 
physics
50.0 kg stoplight hangs from wire over middle of an intersection. wire makes 15 degree angle with horizontal. find tension in each end of the wire
asked on November 20, 2010 
English
In the story Macbeth we can see that he encounter many issues. I have to write an essay picking an issue that happen in the story and than explain how it takes place in the renasssiance and than how it still happens in today's in today's society. So could
asked on December 5, 2012 
math
Bryce has a handful of pennies and nickels.he counts the change and finds 4 times as many pennies than nickels.He has total of 72 cents.How many pennies does he have Can't find a equation
asked on September 22, 2011 
Math
1+1/12+1/3
asked on September 9, 2011 
french question
Does comment vastu? and comment allez vous? both mean how are you doing?
asked on December 3, 2007 
Chemistry Inorganic
What rationale is there for the mixing of sulfuric acid aqueous and water being exothermic but the mixing of solid ammonium chloride with water to be endothermic? Solid NH4CL dissociates in water, and the dissociation process requires some energy, because
asked on July 31, 2007 
Math
The sum of two whole numbers is 9,and their positive difference is 5.what is the product of the numbers?
asked on October 7, 2011 
math
1.05^30
asked on September 16, 2011 
math
determine the number of scoops per coneso each of the 88 students at an ice cream party has a different pattern of chocolate and vanilla icecream scoops.
asked on December 10, 2010 
Chemistry
Which forms the more alkaline solution and why? Al2O3; B2O3; CO2 or SiO2 Al2O3 and SiO2 are not watersoluble. CO2 forms the weak acid H2CO3, in water. What does that leave you with?
asked on August 8, 2007 
Chemistry
Which would produce the greatest change in the water level in a 25mL graduated cylinder? a)7.42g of Al (d=2.70 g/mL) b)2.68g of oak (d=0.72g/mL) The answer is a) but I can't see why... It is not the total volume that counts for raising the water level, it
asked on August 7, 2007 
Algebra
Six times a number is eight more than two times the number
asked on October 3, 2016 
math
there are 3 numbers, a,b and c. the sum of a and b is 15.31 , the sum of b and c is 9.54,and the sum of a and c is 5.15. find the sum of a,b and c.
asked on March 1, 2015 
math
the quotient of n and 5 is 4 times n. Write each sentence as an equation
asked on January 16, 2013 
math
Write each sentence as an equation. The difference of y and 3 amounts to 12.
asked on January 16, 2013 
Math
Jennifer plans to fence a rectangular area around her rectangular swimming pool. The total area enclosed by the fence, including the pool, should be 5 times the area of the pool alone. The pool is 20 feet by 17 feet. What is the total area enclosed by the
asked on November 19, 2012 
Biology (Science)
What is the biological definition of life?
asked on September 2, 2012 
algebra
is the math statement true or false 11/8 > 23/15
asked on March 13, 2012 
Math
A record stores sells CDs for $12 each.A music club offers 5 free CDs and charges $15 for each additional CD.How many CDs would have to buy for cost to be the same?
asked on September 28, 2011 
Math
Distance from x to Y is about 171 miles. This is about 189 miles less than the distance from x to z. How far is x to z if you stop in y along the way.
asked on September 21, 2011 
Algebra
The problem is 9x+4y=12 x=265y Solve by substitution method
asked on July 3, 2011 
MAT/116
I was just wandering if this was correct? 1. Your company is planning to spend no less than $80,000 and no more than $100,000 on a landscaping project, which will be used as a promotional park that promotes your toaster manufacturing company. Write an
asked on May 30, 2011 
Algebra 2
Factor f(x)=x^4+x^38x^2+6x+36 completely
asked on February 18, 2011 
math
the position of an object moving in a straight line is given by s=tsquared8t, where s is in feet and t is the time in seconds the object has been in motion. how long(to the nearest tenth)will it take the object to move 10 feet?
asked on April 23, 2010 
calculus
xy+y^2=1 find d^2/dx^2 at (0,1)
asked on February 23, 2010 
English
Can you suggest/comment on my poem? Death and Liquorice It is funny how everyone sees me, As a looming ghost above their head In fact we have never met before Yet they still anticipate me with dread. What I do I do as a professional Employed by the great
asked on September 7, 2008 
Chemistry
What is the stronger base, OH^ or CH30^? I've been told the answer is the conjugate base of methanol ion but i beg to differ. THe respective pKa's of water and methanol (the conjugate acids) are 15.7 and 15.5. This would imply that out of water and
asked on December 22, 2007 
Geography
What is urban exclusion? I think it is the spatial restrictions imposed on certain societal groups as a result of urban expansion/development by the better off people. Am I close?
asked on September 26, 2007 
Organic Chemistry
Why does CH3Br react faster with hydroxyl ions (OH^) than CH3Cl? In the halogen series, Br has a weaker bond with the CH3 than Cl. Smaller halogen atoms have a larger electron affinity to fill the outer shell. The greater tendncey of CH3Br to break up
asked on August 5, 2007 
human groth
in Bonfenbrenner's model, shyness or agressive behavior can be called
asked on October 6, 2016 
Riddles
Some have more than 100 some havr none
asked on September 26, 2016 
math
there's a circle inside of a square like this: donlehmanjrcom/Tai%20Chi/Tai%20Chi%20Newsletters/excerpts11%20images/image001.png (add the period before the com) the circle has a radius of 2 in and an area of 12.56 in^2 how do i find the area of the space
asked on May 14, 2016 
Chemistry
You leave 255 grams of water outside at 21.0 C in the sun. After 30.0 minutes the temperature is 35.0 C. A) how many calories of energy was used by the sun to heat the water up? B) how many joules of energy is this? C) How many Joules / second of power did
asked on September 9, 2015 
algebra
The dimensions of a page are 12 in. by 10 in. and it is supposed to contain 80in2 of the printed region. What should the margin be if all the margins are the same?
asked on July 2, 2014 
math
The sum of three numbers is 92. The first number is 1/3 of the second, and the second is 2/5 of the third. What is the second number?
asked on October 17, 2013 
english
Complete each sentence so that the meaning of the italicized abstract word is made more concrete. (Each question is worth two points) 7. The party was a lot of fun. We 8. Tony is a kind boy who is apt to 9. That day I was so worried that I
asked on May 8, 2013 
Geo.
draw two parallel lines in quadrants 1 and two that are ten blocks apart
asked on April 24, 2013 
math
Use an x to represent each unknown number. Twice the sum of a number and three.
asked on January 16, 2013 
physics
On a banked race track, the smallest circular path on which cars can move has a radius r1 = 103 m, while the largest has a radius r2 = 157 m, as the drawing illustrates. The height of the outer wall is 18 m.
asked on September 10, 2012 
Physics
I am totally new to physics. We are working on summation of moments and I just am not grasping this. I know the formular is M=dF, but his does not help me. I get confused about the middle of settig of euation. I am never sure which distance I should be
asked on September 6, 2012 
Math
An estate was divided among three heirs. After Andrea received 50% of the estate, her mother received 50% of what remained, leaving $20,000 for Andreas uncle. What was the total value of the estate?
asked on November 20, 2011 
Chemisty
Calculate the % error of an experiement if a student obtained a destiny of 1.23g/ml(predicted) and the actual value was 1.30g/ml
asked on October 10, 2011 
Math
What two simpler problem can you use to find 9x38?
asked on September 29, 2011 
Math
Added 5 gallons of gas tank went from 3/8 full to 7/8 how big is tank
asked on September 6, 2011 
algebra
detail the process of polynomial division when the divisor is a monomial. Demonstrate the process with an example. How does this process change when the divisor is not a monomial?
asked on July 23, 2011 
MAT/116
I was just wandering if this was correct? 1. Your company is planning to spend no less than $80,000 and no more than $100,000 on a landscaping project, which will be used as a promotional park that promotes your toaster manufacturing company. Write an
asked on May 29, 2011 
PreCal
Let g(x)=2x+6 if k(g(x))=4x+12/3the square root of 2x5. Find the formula for k(x)
asked on November 22, 2010 
math
find the derivate of the function Y=(2x+3)^4(3x+1)^2?
asked on February 24, 2010 
english 1
The underlined statement is a prepositional phrase. Leslie stood with his back against the wall.
asked on January 31, 2010 
English
can you give me feedback on this poem I penned. Good or bad, I would like your opinion. Decrescendo A violin untouched for years A bow waiting to be strung Chords waiting to be played Strings waiting to be rung A door creaks open softly The timber is
asked on August 23, 2008 
chemistry
How to get the hybridization of N IN NO2 ?
asked on December 6, 2007 
Physics
In terms of Ohms Law (V=IR), when plotting a graph of V against I, is it safe to say that the line passes through the origin, even though 0/0 does not exist?
asked on November 4, 2007 
Chem  DrBob222 & drwls
Just want to say thanks to you guys for the help you gave me during the last couple of months. It was all in preparation for the National Chemistry Test and I just received word I have been selected to be in the running for the National Chem Team. Thanks
asked on October 8, 2007 
Chemistry
In terms of a buffer solution, can one exist with a strong acid and of weak base in equal volumes but different molarities? e.g. 0.1 HCl and 0.2 NH3? I found this to be the case but still can't find a logical reasoning behind it.
asked on September 3, 2007 
Chemistry (Thermochemistry)
Is there any equation out there that links the change in enthalpy (H) to the change in cell potential/voltage (E)? Yes, but the relationship involves the Gibbs Free Energy, which is G = H  TS, snd S is the entropy change. The change in G is approximatly
asked on August 2, 2007

math
3.48 just like what D man said
posted on March 7, 2019 
Precalculus
14.43
posted on February 7, 2019 
Math
Four pizzas are shared equally among zero people, and you want to know how much each person gets.
posted on July 17, 2018