# Selina

Most popular questions and responses by Selina
1. ## 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?

2. ## 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

3. ## 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 ? ?

4. ## algebra

Suppose that \$4000 is invested at an interest rate of 5.5% per year, compounded continuously. What is the balance after 8 years?

5. ## 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

6. ## perimeter

how to draw a 15 cm and 9 cm perimeter

7. ## 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%

8. ## 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?

9. ## Physics

A 2.2-kg 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

10. ## 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?

11. ## 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?

12. ## science

i need help with a reason for the season science lab of how earth orbits sun

13. ## 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

14. ## 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

15. ## 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)=78-15log(t+1) (a)find the students average score when they first took the final exam. (b)what would be the

16. ## Chemistry

CheckPoint: Interpretation of Ethical Systems Review the scenario in Situation 1 on p. 50 of the text.Write a 200- to 350-word paper in which you explain how you would respond to the scenario. Address these ethical systems in relation to the scenario:

18. ## 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?

19. ## 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?

20. ## geography

what is exsolation?

21. ## 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

22. ## 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

23. ## 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

24. ## 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

25. ## social studies

during which twenty year period did the native american population of central mexico fall by around four million?

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

27. ## 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

28. ## 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

29. ## chemistry

How do I work out the density of HCI at 600 celsius ? Thanks

30. ## 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)

31. ## 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?

32. ## 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

33. ## math

find the equation of tangent line to the graph of f(x)=xcosx(√2 x) at a=0

34. ## 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.

35. ## 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:

36. ## minum distance

Find the minimum distance from the point (3,0) to y=(x)^1/2

37. ## math

{y-2}/(a^2-5a+6)=(a+1)/(a-3)-(a+2)/(a-2) 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!

39. ## 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?

40. ## math

find the equation of tangent line to the graph of f(x)=xcos(√2 x) at a=0

41. ## math

the second derivative of f(x)=ln(x^2+1)

42. ## history

The Conflict : The India-Pakistani 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

43. ## Chemistry

Find the molarity of 0.02g of silver nitrate dissolved in 1kg of water

44. ## 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.

45. ## 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

46. ## collage math

f(x)=x^3+3x find the rate of change between the two stated values x:1 to 2

47. ## life science

true or false? The temperature varies greatly throughout the year in a tropical rain forest.

48. ## math

what is 3/4 times 11/12? thnx!

49. ## math

(-11) (1/8) find the product

50. ## 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

51. ## 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 twenty-five, multiplied by three...

1. ## 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
2. ## physics

oh okai

posted on February 17, 2016
3. ## 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
4. ## math

okay I get it and a is as you said just to say x

posted on December 27, 2015
5. ## math

it will be y=x but how do we know it passes through (0,0)

posted on December 27, 2015
6. ## math

yep thanks

posted on December 27, 2015
7. ## math

can't we cancel them out

posted on December 27, 2015
8. ## math

sorry the question is f(x)=xcos(√2 x) at a=0

posted on December 27, 2015

1554

posted on December 18, 2015
10. ## history

thank you :) is there any other sites that might be helpful?

posted on October 6, 2014
11. ## 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
12. ## 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
13. ## 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

ABUOYANTGIRLANT

posted on August 23, 2013
15. ## Art

The last one has all the right answers but 4 is c

posted on January 30, 2013
16. ## chem

where did u get 500ml?

posted on October 14, 2011
17. ## geography

very, very carefully. You probably shouldn't--for 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
18. ## biology/poetry

Plant life stretched up Hoping for sunlight Optimism failed Tall trees stealing the gold Overcast skies blocked the Sun, giver of life Yesterday--not a cloud in the sky Nightime, just quiet stars Terribly impatient for a new day Hot, warm, drenched in

posted on November 4, 2010

just 754/9471. Nothing else you can do :)

posted on November 4, 2010

As I do not know the context--perhaps she was faking an injury? It would be helpful to provide a source!

posted on November 4, 2010
21. ## Expository Essay Help

John !@#\$%^&ennedy was born in a family with a history of political and public service

posted on October 27, 2010
22. ## 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
23. ## 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
24. ## 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
25. ## 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
26. ## chemistry

Thank you guys I will try both suggestions

posted on March 2, 2010
27. ## acids and alkalis

Vinegar soap Handwash Mouth Wash baking soda cold tea Ammonia Bleach Washing Powder Oven cleaner

posted on March 1, 2010
28. ## English expression

internet friends

posted on February 27, 2008
29. ## 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
30. ## math

that means that still equal to 6 right?

posted on February 14, 2008