denis

Popular questions and responses by denis
  1. 10th grade

    Evaluate u + xy, for u = 18, x = 10, and y = 8. a. 188 b. 224 c. 98 d. 36

    asked on September 20, 2010
  2. chemistry

    write the equations for the substitution reaction of methene with bromine under the following conditions. a) reaction in the presence of sunlight CH4+Br2 sunlight=? b) reaction in the absence of sunlight CH4+Br2 =?

    asked on November 22, 2011
  3. chemistry

    9). What is the balanced equation for the acid–base reaction of nitrous acid with lithium hydroxide? LiOH(aq) + HNO3(aq)  H2O(l) + LiNO3(aq) Li(OH)2(aq) + 2 HNO3(aq)  2 H2O(l) + Li(NO3)2(aq) LiOH(aq) + HNO2(aq)  H2O(l) + LiNO2(aq) 2 LiOH(aq) +

    asked on November 28, 2011
  4. Physics

    A boat, which can travel 2.30m/s in still water is in a stream with a current moving at 1.20m/s. if the boat is pointed directly across the stream, determine the velocity of the boat relative to the shore?

    asked on June 27, 2017
  5. chemistry

    which solution has the lower pH? a)0.1 M HCL or 0.1 M HC2H3O2? b)0.1 M NaOH or 0.1 M NH3? c)0.1 M Na2CO3 or 0.1 M NaCl?

    asked on November 9, 2011
  6. math

    on a print with a scale of 1/4"=1',the scale drawing of the living room us 5"by 6".The dimensions of the actual room will be___________ft.by_________ft.?

    asked on May 10, 2016
  7. chemistry

    6). Which solution has the lowest pH? A) 1.3 X10–8 M –OH B) 1.0 X 10–7 M –OH C) 5.1 X10–5 M –OH D) 3.9 X 10–8 M –OH E) 2.3 X 10–3 M –OH

    asked on November 28, 2011
  8. chemistry

    write the equations for the addition reaction of ethene with bromine under the following conditions. a) reaction in the presence of sunlight H2C=CH2+Br2 sunlight=? b) reaction in the absence of sunlight H2C=CH2+Br2=?

    asked on November 22, 2011
  9. chemistry

    what gas is produced in the reaction between calcium carbide and water?write the balanced equation for the reaction.

    asked on November 22, 2011
  10. chemistry

    what is the molarity of a solution prepared by dissolving 2.24 grams of NaOH in enough deionized water to obtain 500.0ml of solution?The molar mass of NaOH is 40.0g

    asked on October 31, 2011
  11. Science

    If a piece of paraffin wax has a mass of 900g and density of 9g/cm3, if the wax was melted to the liquid state approximately what would its volume be?? HELP PLEASE!!!

    asked on December 13, 2015
  12. chemistry

    7). The pH of a solution is 2.89. What is the [H3O+]? A) 1.3 X10–3 M H3O+ B) 1.3 X 1012 M H3O+ C) 7.9 X101 M H3O+ D) 7.9 X 10–13 M H3O+ E) 1.9 M H3O+

    asked on November 28, 2011
  13. chemistry

    10). What is the molarity of an HCl solution if 42.5 mL of a 0.110 M KOH solution is needed to titrate a 25.0-mL sample of the acid? A) 0.187 M HCl B) 0.587 M HCl C) 0.0647 M HCl D) 5.35 M HCl E) 1.70 M HCl

    asked on November 28, 2011
  14. chemistry

    what is the molarity of a solution prepared by dissolving 2.24 grams of NaOH in enough deionized water to obtain 500.0ml of solution?The molar mass of NaOH is 40.0g

    asked on October 30, 2011
  15. Maths Algebra

    Denis bought 5 rulers at sh.(x+150) each and 3 pencils at sh.(2x-400).If he paid sh.3000 for every 3 rulers,find the value of x .

    asked on September 27, 2019
  16. science

    What volume of 0.1M Of sulphuric acid is needed to neutralize 100cm³ of a solution of sodium carbonate of mass concentration 20gram over dm³

    asked on July 26, 2018
  17. chemistry

    What volume of 0.1M Of sulphuric acid is needed to neutralize 100cm³ of a solution of sodium carbonate of mass concentration 20gram over dm³

    asked on July 26, 2018
  18. Geometry

    Find 2 cos(x/2) sin(x/2) when x = -π/6. I know that cos(x/2) = +- sqrt(1-cosx)/2 and sin(x/2) = +- sqrt(1+cosx)/2, but how to use this identity I'm not entirely sure. Please help.

    asked on August 6, 2014
  19. Chemistry

    indium-115 has a half life of 4.5 hours, if you start with a 12.0mg sample of indium-115, how much will remain after 13.5 hours

    asked on May 29, 2014
  20. biology

    how can you recognize carbohydrates from a list of biological molecules

    asked on September 23, 2012
  21. b

    how can a disaccharide be produced from two monosaccharides

    asked on September 23, 2012
  22. biological

    how can a disaccharide be produced from two monosaccharides

    asked on September 22, 2012
  23. biology

    how can you recognize carbohydrates from a list of biological molecules

    asked on September 22, 2012
  24. microbiology

    what is sugar fermentation

    asked on April 19, 2012
  25. sociology

    examine the latent and manifest functions ( of the US response to 9/11. Consider how the emerging structures of society are functional and/or dysfunctional for the nation.

    asked on April 3, 2012
  26. sociology

    examine the latent and manifest functions ( of the US response to 9/11. Consider how the emerging structures of society are functional and/or dysfunctional for the nation.

    asked on April 3, 2012
  27. chemistry

    The density of ethyl ether is 0.713g/ml would 536.8 g of this anesthetic fit into a 750.0ml flask?explain

    asked on February 28, 2012
  28. biology

    a) What type of bond is involved in complementary base pairing? -------------------------------------------------------- b) On what site of the large ribosomal subunit does the second tRNA attach during translation?

    asked on December 6, 2011
  29. biology

    1) What is the complementary strand of the DNA sequence GCAAT? a) GGCTT b) CGTTA c) CGTAT d) GCUUA

    asked on December 5, 2011
  30. biology

    which of the following represents the F1 generation of a monohybrid cross of YY x yy parents? a)100%Yy b)75%Yy:25%YY c)25%Yy:75%yy d)100%yy

    asked on November 30, 2011
  31. biology

    a disease caused by a bb gene is said to be?

    asked on November 30, 2011
  32. chemistry

    8). What is the pH of a fruit with a [–OH] = 3.2  10–9 M –OH? A) 10.5 B) 8.49 C) 3.51 D) 3.5

    asked on November 28, 2011
  33. chemistry

    The [H3O+] in a wine bottle is 3.1  10–2 M. What is the [–OH] in this wine?

    asked on November 28, 2011
  34. chemistry

    summarize the solubilty behavior of hydrocarbons in water (a polar solvent) and in non polar organic solvents

    asked on November 22, 2011
  35. chemistry

    DOES Mg(OH)2 HAVE A pH greater than 7 or less than 7

    asked on November 8, 2011
  36. chemistry

    DOES H3PO4 HAVE A pH greater than 7 or less than 7

    asked on November 8, 2011
  37. chemistry

    WHAT PROPERTY OF SOLUTION IS DESCRIBED BY ITS pH?

    asked on November 8, 2011
  38. chemistry

    calculate the molarity of acetic acid in a vinegar sample,knowing that 5.00ml of vinegar requires 43.50ml of 0.105 M NaOH to just reach the phenolphthalein endpoint in a titration

    asked on October 31, 2011
  39. chemistry

    calculate the molarity of acetic acid in a vinegar sample,knowing that 5.00ml of vinegar requires 43.50ml of 0.105 M NaOH to just reach the phenolphthalein endpoint in a titration

    asked on October 30, 2011
  40. chemistry

    write the balanced formula equation and the net ionic equation for the reaction of sodium hydroxide with hydrochloric acid. Formula equation.............. net equation.............

    asked on October 30, 2011
  41. chemistry

    How many grams of carbon disulfide,CS2 will form if 0.450 mol of carbon is consumed in a 3C+2SO2=CS2 +2CO2 reaction

    asked on October 16, 2011
  42. chemistry

    How many grams of carbon disulfide,CS2 will form if 0.450 mol of carbon is consumed in a 3C+2SO2=CS2 +2CO2 reaction

    asked on October 15, 2011
  43. chemistry

    show how CH4 +O2=CO2+H2O obeys the law of conservation of mass

    asked on October 15, 2011
  44. Statistics

    company claims 10% are green. suppose that candies are packaged randomly into samll bags of 50. school children studying percent open several bags, count colors and find the proportion that are green. a. is the Normal model appropriate here? explain b.

    asked on February 2, 2011
  45. Math

    What is the value of the expression below? 3•(-4)^2

    asked on November 8, 2010
  46. science

    What is another word for conjecture? a. convention b. contrive c. converge d. conclusion

    asked on September 12, 2010
  47. irish

    please unsumble this (IBTGRGUAIRAMI)

    asked on November 19, 2008
  1. science(physics)

    to get the answer

    posted on November 24, 2019
  2. Math

    Which is a way show me

    posted on September 21, 2018
  3. Math

    10

    posted on September 21, 2018
  4. math

    I dont know

    posted on August 29, 2018
  5. Math-age problem

    akjdlad

    posted on February 9, 2018
  6. 7th grade

    my brother said i was annoying and i weighed my fist and it turns out it is 878 grams so if i throw a punch at him with 20 kilos of force how hard would he feel that punch?

    posted on September 3, 2017
  7. math

    distance =time×speed (X-20)(3.25)=2x+30 3.25x-2x=30+65 1.25=95 95÷1.25=76

    posted on March 10, 2016
  8. chemistry

    idont know theb answer

    posted on February 21, 2014
  9. 10th grade

    98 ???

    posted on September 20, 2010
  10. science

    conclusion

    posted on September 12, 2010