selina
Most popular questions and responses by selina
Chemistry
2 NaOH + CuSO4 Na2SO4 + Cu(OH)2 100g of Cu(OH)2 is needed. Assuming 100% yield, how much of 1M NaOH and 0.5M CuSO4 must be used in mL?
asked on March 16, 2014 
math
in an arithmetic sequence whose first term is 4, the 1st, 3rd and 7th terms form consecutive terms of geometric sequence, find the sum of the first three terms of the arithmetic sequence
asked on December 20, 2015 
Chemistry
2) Given the balanced reaction equation predict the moles of each product given the following reactants: AlCl3 + 3 NaHCO3 Al(OH)3 + 3 NaCl + 3 CO2 AlCl3 NaHCO3 Al(OH)3 NaCl 58.4 CO2 a 1 mol 1 mol ? ? b 1 mol 3 mol ? ? c 3 mol 1 mol ? ?
asked on March 16, 2014 
algebra
Suppose that $4000 is invested at an interest rate of 5.5% per year, compounded continuously. What is the balance after 8 years?
asked on May 9, 2010 
English
I have a homework where I have to write about on this topic which says mythical character I admire and I don't have a clue on how to start Please help
asked on May 29, 2018 
perimeter
how to draw a 15 cm and 9 cm perimeter
asked on November 14, 2010 
Veterinary Medicine Math calculations
I was so thankful to see this exact question answered in a different way but I still don't understand how I'm suppose to know how or what to do on the following question. I just seem to always forget something. Fifty milliliters of a solution of 50%
asked on February 6, 2017 
Chemistry 151
5) How many mL of 1M HCl is used to make the following dilutions? a) 100mL of 0.1M HCl = b) 250mL of 0.5M HCl= c) 10ml of 0.01M HCl= 36.64 is the molar mass of hcl do I divide that into ml?
asked on March 16, 2014 
Physics
A 2.2kg baseball is pitched to you at 21 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.17 s, what is the magnitude of the average force the bat exerted on the ball? Please show all
asked on July 7, 2013 
Math
Mrs. Collin has 140 apples. She uses 2/5 of them to bake a pie and 1/4 of them to make jam. How many apples does she have left?
asked on February 18, 2016 
physics
A particle moving with uniform acceleration in a straight line was first observed to be moving at 4.5 m/s. After 10 sec, it was moving at 6.8 m/s. What is its acceleration?
asked on October 8, 2011 
physics
Three capacitors are connected to a battery of unknown voltage as shown in the circuit diagram above. The voltage drop across capacitor C 1 is V 1 = 11 . volts. a) What is the effective capacitance of the three capacitors? c) What is the voltage of the
asked on February 17, 2016 
science
i need help with a reason for the season science lab of how earth orbits sun
asked on February 8, 2015 
algebra
students in a biology class just took a final exam. a formula for predicting the average exam grade on a similar test t months later is. s(t)=7815log(t+1) (a)find the students average score when they first took the final exam. (b)what would be the
asked on May 11, 2010 
Math
Aaron has 120 sports cards. 3/8 of them are football cards and the rest are baseball cards. how many baseball cards does he have?
asked on February 18, 2016 
physics
parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density on
asked on February 15, 2016 
Ethics ADJ/235
CheckPoint: Interpretation of Ethical Systems Review the scenario in Situation 1 on p. 50 of the text.Write a 200 to 350word paper in which you explain how you would respond to the scenario. Address these ethical systems in relation to the scenario:
asked on October 15, 2009 
Chemistry
I need to balance the equation of the reactants NaHCO3>CuCl2 please help me.
asked on March 23, 2014 
Math
Bailey has $105. She spends 3/7 on a new jacket and 1/5 on a new sweater. How much money does she have left?
asked on February 18, 2016 
geography
what is exsolation?
asked on March 6, 2016 
social studies
during which twenty year period did the native american population of central mexico fall by around four million?
asked on September 18, 2008 
Math
The tornadoes have won 75% of their games. If they their next 4 games, their win percentage goes up to 80%. How many games have they played right now? (Please explain how to solve this problem)
asked on July 20, 2016 
chemistry
hey drbob222, where did u get 500ml from? question is: 1.00 mL of a 0.0500 M sucrose solution is transferred to a 100 mL volumetric flask, and the flask brought up to volume. 5.00 mL are taken from the 100 mL volumetric flask and transferred to a 0.500 L
asked on October 14, 2011 
chem
1.00 mL of a 0.0500 M sucrose solution is transferred to a 100 mL volumetric flask, and the flask brought up to volume. 5.00 mL are taken from the 100 mL volumetric flask and transferred to a 0.500 L flask, and it is brought up to volume. What is the
asked on October 10, 2011 
math
how manyyards are in a mile? 1760 I think There are 5,280 feet in a mile. There are 3 feet in a yard. 1 mi x (5,280 ft/1 mi) x (1 yd/3 ft) = ?? Note that the first factor cancels miles and changes miles to feet, the second factor cancels feet and converts
asked on October 22, 2006 
Chemistry
I need to determine the "percentage composition unknown" whatever that is. My current data: a) mass of test tube and foil cover: 7.5323 g b)temp of water bath: 375.65 K c) mass of test tube and foil and gas as sample: 7.5423 g d) barometric pressure:
asked on November 4, 2010 
chemistry
How do I work out the density of HCI at 600 celsius ? Thanks
asked on March 2, 2010 
Math
There are 5 rows  there are 4 items in each row  there are NO more than 10 items Any idea how this can be solved? Draw a 5 pointed star connecting all the vertices. Place one item at each vertex and one item at the intersection of the lines joining the
asked on August 24, 2005 
physics
determine the a)charge on the capacitor b)voltage across the capacitor c)current through the resistor after t=rc when a capacitor is getting charged interms of their peak values
asked on February 17, 2016 
please help physics
parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density on
asked on February 15, 2016 
math
find the equation of tangent line to the graph of f(x)=xcosx(√2 x) at a=0
asked on December 27, 2015 
Direct way to improve yield of ball mill
The Ball Mill as a general grinding equipment, is widely used in dressing, building materials and chemical industry, ball mill can be divided into dry and wet type two kinds of grinding way. According to the row of ore in different ways, and can be divided
asked on June 13, 2013 
The defects of ball mill
The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium
asked on June 13, 2013 
Life orientation
Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.
asked on April 27, 2013 
Math
Mr. Cole has $200. He keeps 3/4 of the money for himself and divides the rest equally between his two children. How much money does each child receive?
asked on February 18, 2016 
math
find the equation of tangent line to the graph of f(x)=xcos(√2 x) at a=0
asked on December 27, 2015 
history
The Conflict : The IndiaPakistani Partition Answer the following questions about the conflict you chose: 1.Who is involved (what countries/regions)? * 2.What is the basis of the dispute? (If there are multiple disputes between these two parties, focus on
asked on October 6, 2014 
Chemistry
Find the molarity of 0.02g of silver nitrate dissolved in 1kg of water
asked on March 16, 2014 
Life orientation
Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.
asked on April 27, 2013 
math
{y2}/(a^25a+6)=(a+1)/(a3)(a+2)/(a2) How can I solve for y in terms of the other variables??? I tried many times, but I just get y=6,can't express y in terms of variables. Can anyone please correct me or teach me?THANKS A LOT!
asked on February 14, 2008 
solcial studies
what made Jamestown a bad settlement?
asked on January 17, 2008 
Economics
After the U.S. invasion of Iraq, the price of jet fuel used by airlines increased dramatically. As the CEO of Air Canada, you have been presented with the following options. Evaluate these options in the context of decision making model. a) raise airfares
asked on January 14, 2007 
Math
Only the 1, +, , X, / , (, ), and = keys on a scientific calculator are working. How can a result of 75 be reached by pushing these keys less than 20 times? isn't five squared twentyfive, multiplied by three...
asked on August 24, 2005 
physics
consider an inductive circuit suppose we want the current amplitude in a radio receiver to be 250*10^6 A when the voltage amplitude is 3.6V at a frequency of 1.6MHz. what inductance reactance is needed?what inductance is needed?
asked on April 4, 2016 
math
the second derivative of f(x)=ln(x^2+1)
asked on December 27, 2015 
life orientation
environmental health hazards that cause ill health,crises,and or disasters within your community or any other community within south africa and globally
asked on April 24, 2013 
collage math
f(x)=x^3+3x find the rate of change between the two stated values x:1 to 2
asked on December 26, 2012 
minum distance
Find the minimum distance from the point (3,0) to y=(x)^1/2
asked on October 6, 2010 
math
(11) (1/8) find the product
asked on February 27, 2008 
life science
true or false? The temperature varies greatly throughout the year in a tropical rain forest.
asked on February 8, 2012 
math
what is 3/4 times 11/12? thnx!
asked on April 2, 2009

physics
but for my previous question if a sheet of mylar is placed between the plates how will the voltage across the plate and the charge density on the plate change?
posted on February 17, 2016 
physics
oh okai
posted on February 17, 2016 
physics
if the mylar is removed and the plates are moved 1mm further from each other what will be the voltage across the plate and how much work will it take to move the plate apart
posted on February 17, 2016 
math
okay I get it and a is as you said just to say x
posted on December 27, 2015 
math
it will be y=x but how do we know it passes through (0,0)
posted on December 27, 2015 
math
yep thanks
posted on December 27, 2015 
math
can't we cancel them out
posted on December 27, 2015 
math
sorry the question is f(x)=xcos(√2 x) at a=0
posted on December 27, 2015 
4th grade
1554
posted on December 18, 2015 
history
thank you :) is there any other sites that might be helpful?
posted on October 6, 2014 
history
yes please do you know any sites that would help me? i have been stuck on this for weeks
posted on October 6, 2014 
Economics
Suppose that you are a bicycle producer. In 2 or 3 sentences, explain why you are willing to supply the most bicycles at the highest price. You must use your imaganation to answer this in your own words.
posted on September 15, 2014 
Chemistry
Thank you very much for your time on this and the other problems I posted. You are appreciated. Selina Olomua
posted on March 16, 2014 
9th grade
ABUOYANTGIRLANT
posted on August 23, 2013 
Art
The last one has all the right answers but 4 is c
posted on January 30, 2013 
chem
where did u get 500ml?
posted on October 14, 2011 
geography
very, very carefully. You probably shouldn'tfor several reasons (which I will list) 1. You value your own sanity 2. You value your time 3. The constitution is a very long document, but to leave any part out would warp its meaning. The words are there for
posted on November 4, 2010 
biology/poetry
Plant life stretched up Hoping for sunlight Optimism failed Tall trees stealing the gold Overcast skies blocked the Sun, giver of life Yesterdaynot a cloud in the sky Nightime, just quiet stars Terribly impatient for a new day Hot, warm, drenched in
posted on November 4, 2010 
7th grade
just 754/9471. Nothing else you can do :)
posted on November 4, 2010 
8th grade
As I do not know the contextperhaps she was faking an injury? It would be helpful to provide a source!
posted on November 4, 2010 
Expository Essay Help
John !@#$%^&ennedy was born in a family with a history of political and public service
posted on October 27, 2010 
Algebra
You would take your answers and plug them in to the equation. 4(6^2)+4(6)120=0 and 4(5^2)+4(5)120=0 then work out the problems and if you are correct 0=0 Hope this helped
posted on May 12, 2010 
arithmetic
Thank you for correcting me, my finger must have hit the 5 instead of the 2. The answer is #3.12 Thanks
posted on May 11, 2010 
algebra
I know the answers I just am not sure how to work the problem to get them. (a)78 (b)67.5 Please help me with the working of these problems. Thank you
posted on May 11, 2010 
arithmetic
when you are working with a percentage you move the decimal two spots to the left and then multiply the purchase by the percentage of tax in decimals. $48x0.065= $3.15 I hope this helps
posted on May 11, 2010 
chemistry
Thank you guys I will try both suggestions
posted on March 2, 2010 
acids and alkalis
Vinegar soap Handwash Mouth Wash baking soda cold tea Ammonia Bleach Washing Powder Oven cleaner
posted on March 1, 2010 
English expression
internet friends
posted on February 27, 2008 
math
however,6 is not a variable..the question is asking to solve for y in terms of other variables
posted on February 14, 2008 
math
that means that still equal to 6 right?
posted on February 14, 2008