Posts by Saira

Total # Posts: 198

  1. Math 2

    -50
  2. computer sc.

    Draw a flowchart to calculate the average of 50 students in one subject.
  3. Math

    what is a volume of a triangular prism 5m 12m 9m
  4. chemistry

    what is the molarity of the solution comtaining 2.5g of acetic acid in 75g of benzene
  5. Math

    What's the answer then?
  6. Math

    Whats the answer?
  7. Math

    Tony is 2/3 as old as Pete; the difference in their age is 4 years. How old is Pete?
  8. math

    Answer is 75
  9. Math

    If Rita can type 55 words a minute, how many minutes to the nearest minute will it take her to type a 1695-word article?
  10. physics

    A person of mass 60 kg is standing on a raft of mass 40kg in a lake. The distance of a person from bank is 30m. If a person starts running towards bank with velocity 10m/s then his distance from bank after 1s will be ?? And explain with diagram and proper steps
  11. science

    when people remember memories after a memory loss, would you call those memories flashbacks or is there a different term? and is it possible for someone to lose memory for a specific event but remember everything after that? what is the term and are there any websites which ...
  12. Health

    how can a disabled wheelchair person lead a normal life? how do they cook? etc
  13. Math!!!! *plz help*

    Use Brackets. Write Each Expression so that it equals the number in blue. a) 8+2x5 50 b) 6x3+1 24 c) 1+6x3+1 25 d) 2+8x5-1 49 e)7+14\7-5 14 f)12\2x5-4 2 Help Me Please i don't get what to do and how to.... ( \ stands for division)
  14. Math

    thnx
  15. Math

    50 24 25 49 14 2 = numbers in blue in my textbook
  16. Math

    Use Brackets. Write Each Expression so that it equals the number in blue. a) 8+2x5 50 b) 6x3+1 24 c) 1+6x3+1 25 d) 2+8x5-1 49 e)7+14\7-5 14 f)12\2x5-4 2 Help Me Please i don't get what to do and how to.... ( \ stands for division)
  17. English

    What does fantastical mean? My essay topic is compare the fantastical in Poe and lawrence's "the rocking horse"
  18. chemistry

    What is the approximate energy required to raise the temperature of 5 L of air by 230 °C? The volume is held constant. (Assume air almost entirely consists of nitrogen, oxygen, and argon, and that it is initially at 273 K. Cv(specific heat) for nitrogen=20.7,oxygen=21 and ...
  19. chemistry

    What is the approximate energy required to raise the temperature of 5 L of air by 230 °C? The volume is held constant. (Assume air almost entirely consists of nitrogen, oxygen, and argon, and that it is initially at 273 K. Cv for nitrogen=20.7,oxygen=21 and argon=12.5 ...
  20. languagge

    whats the natural resources of Japan ?
  21. math grade 5

    4> OOps you have to spin it 3 times not 2 times
  22. math grade 5

    My sister in grade 5 needs help but i dunt exactly know how to do the answers myself, so if someone can help me out i can explain to her better. Thanks 3. You are using a tree diagram with 12 branches to show the possible outcome of a probability experiment What might the ...
  23. science

    a ball is thrown from a point 100m above the ground with speed 20m/s.find the velocity,direction and magnitude with which it strikes the ground?
  24. sciene

    thanks alot ms.sue
  25. sciene

    how can solar power work at night
  26. health

    thank you Ms.sue and bobpursley.
  27. health

    1. Carbohydrates 2. Protein 3. Fat 4. Minerals 5. Vitamins 6. Water
  28. health

    a dinner that includes all six nutrients? what can that be.please help me.
  29. science 5

    im not sure
  30. science 5

    ts the est source of power in toronto please tell me i need help
  31. health

    i also need the names of the different fast food so i can research there ingrdients. thank you
  32. health

    thanks
  33. health

    need help
  34. health

    unhealthy fast food you can find list ingredents
  35. ancient civillation

    we stared this unit 2 days ago and we have a project on them they are china egypt and greaPr
  36. ancient civillation

    which lasted the longest. which lasted shortest. which began earliest. which began latest. Also what were the civillations that lasted 3000 years or more. please help i`m confused.
  37. social studies

    thank you writeacher
  38. social studies

    i need help for my project please help
  39. social studies

    the habbitat and clothing of Ancient Civilizations – ancient Egypt please help. Thanks
  40. math

    A spool has a radius of 5cm . A string is 8.8 m long. How many times can the string be wound around the spool?
  41. math

    what is 20 Jamaican dollars equal in Canada.
  42. Chemistry

    nvm i got it had to conver delta S J/k to kj/k
  43. Chemistry

    How do i calculate: What is is ΔG° at 25 °C? 2O3(g) → 3 O2(g) ΔH° = -284 kJ ΔS° = 139 J/K i know the equation is: ΔG°= ΔH°- t (ΔS) im not getting right answer
  44. spelling

    decades:sad ,dad ...
  45. spelling

    i also cant figure words for decades
  46. spelling

    perimeter: meter ,merit litre:let
  47. spelling

    can you list some smaller words that are in perimeter and litre. thank you
  48. writting

    Thank you . You helped me alot.
  49. writting

    Instead of these words i want more powerful words that mean the same but is more powerful.
  50. writting

    what does hewn mean? Also can i get a list of synonyms for objects , cutting , impact and act. please help!
  51. 4th grade

    maybe there is 6 pennies and 30 dimes.
  52. 3rd grade

    heres more rhyming worlds: flick , Kick.
  53. 2nd grade

    I came up with the same number as chelsea.
  54. Chemistry

    IN the polystyrene beaker, mix 20mL of 0.1 M Acetic acid and 25mL of 0.1M Sodium Acetate and immediately measure the pH. Remove the electrode and add 5ml of 0.1 M HCl to this buffer. Stir the solution and measure the pH. _______________ INFO: concentration of acetic acid= 0.1M...
  55. Chemistry

    Yes they go together
  56. Chemistry

    Part A: Unknown Acid use 1gram and mix with 120 mL of distilled water Determine the concentration of the acid by titrating with 0.0998 M of NaOH Concentration of NaOH= 0.0998M Volume of NaOH= 3.5 mL # moles of NaOH= Initial Concentration of Weak Acid- Show Calculation of Ka ...
  57. Chemistry

    Hydrolysis of Salt: Using the universal indicator we had to determine the pH of sodium acetate, and the results i got was pH- 8.5 . Now i have to explain this with a equation to show hydrolysis. I don't know how to write it out but, Sodium is not hydrolyzed and acetate is ...
  58. Chemistry

    Calculate the pH of a 0.10 M solution of barium hydroxide, Ba(OH)2.
  59. duratioon

    how to calculate duration of a balance sheet
  60. 4th grade

    please help
  61. 4th grade

    Before farms before did not have electronics so it was hard to to work.Also Farmers did not use fertilizers so it also was hard to grow crops.And there is more about the lord and peasants.
  62. 4th grade

    explain how farms today are different than medieval farms . Compare the farms. list a lot of differences and same things . please help!
  63. social studies, 4 thgrade

    what type of games do village people now play.
  64. 4th grade

    Thanks Ms.sue!!!
  65. 4th grade

    explain how village customs today are different than medieval times village customs.please help
  66. 4th grade

    You have GREATER chance with box b because there is only 1 yellow marble and there is 2 red marbles so most of the marbles are red,but box a has almost the same amount of red and yellow marbles.
  67. Chemistry

    So its deltaTf = Kf * m m= 9.70°C/-1.86°C kg/mole = 5.2515 m (molality) What i'm not sure about is, if Delta Tf= in this equain is tfinal-t initial or its the freezing point as ypu mentioned .5C
  68. Chemistry

    Hey guys I did a lab and I have to answer the questions relating to the lab. I did question can someone please check if these are accurate 1. Calculation to Determine the molecular weight of unknown substance Mass of unknown used: 2.0232 g Mass of water used: 50.0 g (0.05kg) ...
  69. Chemistry

    Raoult's Law and Ionic or Organic Solutions At 55.0 C, what is the vapor pressure of a solution prepared by dissolving 62.8 g of LiF in 247 g of water? The vapor pressure of water at 55.0 C is 118 mmHg. Assume complete dissociation of the solute.
  70. Chemistry ....Please Double check

    If 4.55 g of sodium sulphide and 15.0 g of bismuth nitrate are dissolved in separate beakers of water which are then poured together, what is the maximum mass of bismuth sulphide, an insoluble compound, that could precipitate? What reactant was the limiting reactant? Na2S + Bi...
  71. Chemistry

    Rank the following ionic compounds by lattice energy. Highest to Lowest LiCl MgO Na2O Beo Na2S
  72. Chemistry ....Please help

    Is this Correct? 3Na2S + 2Bi(NO3)3 -->Bi2S3 + 6Na^+(aq)+ 6NO3-(aq) A.) 4.55g/ 78.05= 0.059 moles Na2S 15.0g/ 394.99= 0.038 moles Bi(NO3)3 B.) Na2S= 0.059/ 3= 0.019 Bi(NO3)3= 0.038/ 2= 0.019 (Just for general knowledge if this was a different question, and after dividing by ...
  73. Chemistry ....Please help

    If 4.55 g of sodium sulphide and 15.0 g of bismuth nitrate are dissolved in separate beakers of water which are then poured together, what is the maximum mass of bismuth sulphide, an insoluble compound, that could precipitate? What reactant was the limiting reactant? Na2S + Bi...
  74. Art

    I need help understanding the Principles and Elements of Visual Arts with the help of images which examplify them...
  75. psychology

    Well elemenatry my dear isn't it obvious that the correct choice is B.
  76. gr.10 math!

    factor the equation: -6x^2+15x+36 please show me the steps in answering this problem. thanksss..)
  77. Chemistry

    Which of the following mixtures would result in buffered solutions when 1.0 L of each of the two solutions are mixed? a) 0.10 M NaCl and 0.10 M NaNO2 b) 0.10 M NaCl and 0.10 M NH4Cl c) 0.10 M CH3NH2 and 0.15 M CH3NH3Cl d) 0.10 M HCl and 0.05 M NaNO2 e) 0.10 M HCL and 0.20 M ...
  78. Chemistry

    I am not really sure how to do this: Calculate the pH when 1.0*10^-3 moles of solid NaOH is added to a) One liter of 9.1*10^ -6 M HCL b) One liter of a solution containig 0.05 M CH3COOH and 0.1 M CH3CooNa
  79. Chemistry

    Buffers- Common Ion effect IS this Correct Calculate the pH of a aqueous solution containing 0.15 M HNO2 and 0.20 M NaNO2 (aq). The Ka of nitrous acid is 4.0*10^-4. HNO2 + H20 <--> NaNO2- + H30^+ Inital 0.15 0.20 X Final 0.15 0.20 Ka= [H30+][NaNO2]/ [HNO2] 4.0*10^-4 = [...
  80. Chemistry

    Hydrolysis of Salt: Using the universal indicator we had to determine the pH of potassium chloride, and the results i got was pH- 7.5 . Now i have to explain this with a equation to show hydrolysis. I dunno how to write it out, but i think KCL should be neutral.
  81. Chemistry

    This is what i have so far...The Ka is 1.8*10^-5 so pKa is= -log(1.8*10^-5) = 4.74 pH= pKa+log ([C2H3O2^-]/[HC2H3O2]) = 4.47+ log ([C2H3O2^-]/[HC2H3O2])
  82. Chemistry

    I actually posted this up before and Gk helped out but i don't understand the steps what do i enter for the pka for the first one? __________________________________________ I did an experiment on Buffers: In a polystyrene beaker, mix 20 ml of 0.1M Acetic acid ad 25 ml of ...
  83. Chemistry

    OMg iforgot i posted it up befoe sorry
  84. Chemistry

    A 80.0 mL volume of 0.25 M HBr is titrated with 0.50M KOH. Calculate the pH after addition of 40.0 mL of KOH.
  85. Chemistry

    A 80.0 mL volume of 0.25 M HBr is titrated with 0.50M KOH. Calculate the pH after addition of 40.0 mL of KOH.
  86. Chemistry

    I did an experiment on Buffers: In a polystyrene beaker, mix 20 ml of 0.1M Acetic acid ad 25 ml of 0.1 M sodium acetate and immediately measure the pH. Remove the electrode and add 5 ml of 0.1 M HCL to this buffer. Stir the solution and measure the pH. This is my data: Conc.of...
  87. Chemistry

    A 0.040M solution of a monoprotic acid is 14% ionized. Calculate the Ka for the weak acid. ---------------- so: HX <---> H+ + X- Ka= [H+][X-]/ [HX] Since its a monoprotic acis i know the concentration of H and X will be equal And the HX will be 86% (100%-14%) BUt i m not...
  88. Chemistry

    Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.70. You have in front of you * 100 mL of 6.00×10−2 M HCl, * 100 mL of 5.00×10−2 M NaOH, and plenty of distilled water. You start to add HCl to a beaker of water ...
  89. Chemistry

    [CH3COOH] + [CH3COO-]= 0.100 M pH = pKa + log [CH3COO-] / [CH3COOH] 5.00 = 4.760 + log [CH3COO-] / [CH3COOH] 10^0.24 =1.74 = [CH3COO-]/ [CH3COOH] I have an idea how to solve it but i dunt know how to get the M of CH3COO AND CH3COOH
  90. Chemistry

    A beaker with 150 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 5.60 mL of a 0.280 M HCl solution to the beaker. How much will the pH change? The pKa of acetic ...
  91. Chemistry

    A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top...
  92. 1st grade

    You have to clean your room because its your room not your moms.
  93. 4th grade Math

    A polygon can be any shape not just shapes with 4 angles. anonymous is right.
  94. Chemistry

    WHen i did it the answers i got was order of reaction m= 2 and k = 4.6 Can someone please double check
  95. Chemistry

    i need help with a rate law question: The reaction is 2ClO2(aq) + 2OH -(aq)---> ClO3-(aq)+ ClO2-(aq) + H2O(l) Experiment 1: [ClO2]0= 0.0500 [OH-]0= 0.100 INITIAL RATE= 5.75*10^-2 Experiment 2: [ClO2]0= 0.100 [OH-]0= 0.100 INITIAL RATE= 2.30*10^-1 Experiment 3: [ClO2]0= 0....
  96. Chemistry..Please Help

    thank you i got the answers
  97. Chemistry..Please Help

    HENRY'S LAW I did the first one im not sure how to do the 2 and the 3rd question. 1. What is the Henry's law constant for CO2 at 20{C}? C=kP K=c/p = 3.70*10^-2/1.00atm= 0.037 2. What pressure is required to achieve a CO2 concentration of 6.00×10−2 at 20{C...
  98. Chemistry..

    oops sorry when i multiply (0.002 Litres)(0.138) the answer i get is 0.000276 and kg was an accident
  99. Chemistry..

    A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.180 g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28C the osmotic pressure produced by the solution was 0.138 atm. What is the molar ...
  100. Chemistry please help

    thank you
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