lydia

Popular questions and responses by lydia
  1. Chemistry

    How many molecules are in 2.10 mol CO2? A. 2.53 x 10^24 molecules B. 3.79 x 10^24 molecules C. 3.49 x 10^24 molecules D. 1.26 x 10^24 molecules*** I think it is D, but can someone check my work? Amount of mols x Avogadro's number (2.10 x 6.02 x 10^23) 1.26

    asked on December 5, 2019
  2. History

    Describe how humanist thought led to scientific and artistic innovations during the Renaissance. What were the lasting effects on later societies?

    asked on July 30, 2019
  3. science

    liquid water has a constant density. Do you agree or disagree with this statement? Why or why not? Be sure to support your argument by using what you have learned about the states and motion of matter. please help

    asked on August 21, 2017
  4. Math Help? Check my answers.

    1. Name the coefficients in the polynomial. 4x^2 + 3x - 3 4, -3, -3 4, 3, 4, 3, 3, -4, -3, 2. How many terms are in the following polynomial? 6x^4 + 3x^3 - 2x^2 + 15x - 14 5 4 3 2 3. In the expression -7x - 5x^2 + 5, what is the coefficient of x? 7 5 -5 -7

    asked on May 19, 2014
  5. Algebra

    Determine the discriminant for the quadratic equation -3 = x^2 + 4x + 1. Based on the discriminant value, how many real number solution does the equation have? Discriminant =b^2 - 4ac

    asked on March 5, 2017
  6. science

    A scoop of ice cream is placed on top of a warm piece of pie in a bowl. Which statements about the scenario are true? (Select all that apply.) the pies energy will destroy a portion of the ice creams energy the overall amount of energy in the bowl will

    asked on August 22, 2017
  7. science

    Baking soda is mixed with water, and no bubbles are produced. When baking soda is mixed with vinegar, it bubbles and foams rapidly. What chemical property of baking soda is shown in the scenario? 1)reactivity 2)boiling point 3)flamibility 4)color change

    asked on August 17, 2017
  8. science

    List your own example of turning an observation into a hypothesis. Be sure to list all five steps: observation, explanation, test (independent variable), prediction (dependent variable), and hypothesis. please help

    asked on August 19, 2017
  9. Algebra

    Find the net change in the value of the function between the given inputs. g(t) = 8 − t2; from −6 to 9

    asked on July 21, 2015
  10. chemistry

    Examine the analogy and how it compares a part to a whole. link : chain :: atom : _____ Choose the answers that best complete this analogy. (select all that apply) molecule matter compound proton please help

    asked on August 17, 2017
  11. History

    Which best describes the significance of the Treaty of Tordesillas? A) It was the first time in world history that two European nations sought a third party to mediate a dispute regarding foreign lands. B) It was the first time in world history that two

    asked on September 21, 2018
  12. calc / physics

    Suppose that a 5-foot-long chandelier falls from a 35-foot ceiling and that you are 6 feet tall and standing directly under the chandelier (a) How long do you have to get out of the way when it drops? =-16(t^2)+Vt+h =-16(t^2)+0+(35-5-6) (for the bottom of

    asked on October 1, 2014
  13. Math

    Lee Holmes deposited $16,600 in a new savings account at 9% interest compounded semiannually. At the beginning of year 4, Lee deposits an additional $41,600 at 9% interest compounded semiannually. At the end of year 6, what is the balance in Lee’s

    asked on October 15, 2011
  14. chemistry

    Which statement correctly describes a covalent bond? The atoms' valence electrons combine to form a network of bonds. Valence electrons are transferred from one atom to the other. The atoms' valence electrons are shared between the atoms. All of the atoms'

    asked on August 30, 2017
  15. science

    Which process is an example of a chemical change? drying clothes in the dryer chopping a tree activating a glow stick heating a cup of tea

    asked on August 17, 2017
  16. Urgent math

    population growth model. Can anybody please help me out in trying to solve this problem? It's my homework and I don't seem to understand what I am getting. The count in a culture of bacteria was 400 after 2 hours and 25,600 after 6 hours. (a) What is the

    asked on August 3, 2015
  17. science

    Molten lava coming out of a Hawaiian volcano cools down and forms rock. Which statement best describes the flow of energy in the scenario? energy moves from lava to the surroundings energy moves from the surroundings to the lava energy stays within the

    asked on August 22, 2017
  18. acounting

    A company purchased and installed a machine on January 1 at a total cost of $72,000. Straight-line depreciation was calculated based on the assumption of a five-year life and no salvage value. The machine was disposed of on July 1 of the fourth year. The

    asked on February 22, 2015
  19. chemistry

    Examine the equation. 6CO2 + __H2O → C6H12O6 + 6O2 In order to balance the equation, what coefficient must be placed in front of H2O 4 6 12 1 please help

    asked on September 4, 2017
  20. physics

    a mass if 10kg move with a velocity of 4ms-1find it kinetic energy.

    asked on January 22, 2016
  21. english

    Which of the following sentences contains an italicized word that's used as a predicate adjective? A. Jerry looks into the microscope. B. Jerry looks ill today. C. Jerry looks at the map. D. Jerry looks disdainfully at the pile of laundry. I think it's B.

    asked on March 21, 2014
  22. psychology

    what would the dependent and independent variable and control and experimental group be in this problem: John is intrigued by the relationship between frustration and aggression. He proposes to study whether socioeconomic status is a factor in how drivers

    asked on September 18, 2007
  23. chemistry

    is a solution of hydroxylamine fluoriede HONH3F acidic or basic?

    asked on April 8, 2020
  24. World History

    Which accurately describes the differences between Orthodox and Reform Jews? orthodox jews strictly follow mosaic law, whereas reform jews do not follow all ancient laws reform jews strictly follow mosaic law, whereas orthodox jews do not follow all

    asked on September 26, 2017
  25. College Algebra

    A function f has the following verbal description: "Multiply by 5, add 9, and then take the fifth power of the result." and find the inverse?

    asked on July 22, 2015
  26. College Algebra

    If g(x) = x2 + 6x with x ≥ −3, find g−1(55) I need help solving this problem this is an example but it does not thoroughly is explained. :/

    asked on July 20, 2015
  27. physics

    At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer starts at rest, slides without friction, and decends through a vertical height of 2.40 m, what is her speed at the bottom of the slide?

    asked on November 24, 2008
  28. Geometry

    The stack on the left is made of 15 pennies and the stack of the right is also made of 15 pennies. If the volume of the stack of pennies on the left is 360mm cubed what is the volume of the stack of pennies on the right in cubic millimeters?

    asked on April 11, 2020
  29. science

    Molten lava coming out of a Hawaiian volcano cools down and forms rock. Which statement best describes the flow of energy in the scenario? energy moves from lava to the surroundings energy moves from the surroundings to the lava energy stays within the

    asked on August 22, 2017
  30. science

    Which statements best describe how the properties of gases and plasmas differ? (Select all that apply). The particles of plasmas have a higher kinetic energy than the particles of gases. Gas particles are charged while plasma particles are uncharged.

    asked on August 21, 2017
  31. science

    Imagine yourself making a nice cup of tea on a cold winter day. You begin by boiling some water in a kettle. Next, you add the steaming liquid to your cup. Then, you open a tea bag and repeatedly dunk it into the water. You pour a dash of milk and drop a

    asked on August 16, 2017
  32. math

    Please help me this is confusing. △ABC has a right angle, ∠ABC, and m∠BCA=45∘. Therefore, m∠CAB= [blank] −−−−−−∘

    asked on December 11, 2019
  33. History

    Which accurately describes the exploration efforts of Francisco Pizarro? A) Pizarro led expeditions to modern-day Pennsylvania and established a Quaker colony. B) Pizarro led a fleet of three ships—the Niña, Pinta, and Santa Maria—to the Bahamas. C)

    asked on September 21, 2018
  34. educational technology

    3. adding transitions to slides in a presentation A. offers effects when moving from one slide to the next.***** B. adds animation to selected text and images. C. adds a new slide to a presentation in microsoft powerpoint. D. creates sound effects

    asked on March 12, 2015
  35. math

    From the top of a lighthouse 75 feet high, the cosine of the angle of depression of a boat out at sea is 4. To the nearest foot, how far is the boat from the base of the lighthouse?

    asked on September 7, 2011
  36. physics

    At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^-3m, and the area is 0.016 m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*10^5 J/kg.

    asked on February 21, 2008
  37. Math

    Help me solve these question IF LOGA IS 7 AND B=LOG2 EXPRESS LOG35 IN TEARM OF A AND B.

    asked on January 13, 2020
  38. science

    Observation The trash smells. Explanation Decaying biological material causes the trash to smell. Test (independent variable) Add food scraps to one trash can along with other materials, such as plastic, cardboard, paper, and tin. To a second trash can,

    asked on August 19, 2017
  39. science

    which items would still be classified in the same way? Which items would be classified differently? • atoms • elements • compounds • molecules • matter please help

    asked on August 16, 2017
  40. College Alg

    Find the inverse function of f. f(x) = 36 − x2 , 0 ≤ x ≤ 6 I can't seem to find this inverse, someone help please?

    asked on July 21, 2015
  41. Geometry: Student Correction (Stuck)

    Joelle set up the following proportion: 4/6 = 5/x. Solve for x. Determine if proportion is correct. If not, explain what is wrong with it.

    asked on March 29, 2013
  42. Geometry

    Triangles ABF and EDG are congruent. Triangles ABF and GCF are equilateral. AG = 24 and CG = 1/5 AB. What is the total distance from A to B to C to D to E?? Please I don't understand this

    asked on July 17, 2011
  43. 5th grd math- metric conversion

    30m = 6000, i have converted to cm, in, and ft, no where close to getting 6000? help

    asked on March 7, 2011
  44. social studies

    Who is the richest person in Paraguay? Thanks!

    asked on November 13, 2010
  45. algebra

    Can someone please help me with these problems? Please and thank you. 1)Solve the equation: (1/x)+[x/(x+2)]=1 2)Simplify the complex fraction: 3-(3/4) ------- (1/2)-(1/4) (1/x)+ [x/(x+2)] = 1 Convert left side to the sum of fractional terms with common

    asked on May 13, 2007
  46. chemistry

    Can someone help me finish this equation, please? We're adding Magnesium to Copper sulfate and getting Copper. This is what I have as of now: CuSO4+Mg===>Cu I'm guessing it is a single replacement, so should I add MgSO4 to the right? But then my lab

    asked on March 8, 2007
  47. chemistry

    What is a saturated solution?

    asked on September 11, 2017
  48. chemistry

    Which of the answers choices best describes John Dalton's contribution to atomic theory? he discovered to nucleus he gave future scientist a foundation for understanding how electrons move. he gave future scientist a foundation for understanding how atoms

    asked on August 24, 2017
  49. science

    In which of the following phase transitions is energy released? liquid to solid solid to gas liquid to gas solid to liquid please help

    asked on August 22, 2017
  50. science

    liquid water has a constant density. Do you agree or disagree with this statement? Why or why not? Be sure to support your argument by using what you have learned about the states and motion of matter.

    asked on August 21, 2017
  51. science

    Which process is an example of a chemical change? A metal railing rusting in damp weather alcohol evaporating from a cotton swab steam rising from a boiling pot of soup a piece of wood shrinking as it dries out

    asked on August 17, 2017
  52. Chemistry

    Can someone check my answer and let me know me if the are right or wrong. If I wrong can you give me the right answer plz. 1. What is the maximum amount of KCl that can dissolve in 600 g of water? (The solubility of KCl is 34 g/100 g H₂O at 20°C.) * 34

    asked on March 10, 2017
  53. math

    Earned five dollar earned $5.50 per hour as an assistant in an auto repair shop how much will Taylor on if she works for and a half hours on Friary's

    asked on September 13, 2016
  54. Urgent math

    please help The fox population in a certain region has a relative growth rate of 7% per year. It is estimated that the population in 2005 was 19,000. (a) Find a function n(t) = n0ert that models the population t years after 2005. n(t) = (b) Use the

    asked on August 3, 2015
  55. College Algebra

    f(x) = x2 + 11x, x ≥ − 11/2 find the inverse

    asked on July 22, 2015
  56. Algebra

    If g(x) = x2 + 8x with x ≥ −4, find g−1(20)

    asked on July 21, 2015
  57. science

    Pepsin,which speeds up the breakdown of protein,is classified as

    asked on January 21, 2015
  58. Math

    How can you write a unit rate if at least one term is a fraction? How is this different from writing a unit rate where both terms are whole numbers?

    asked on September 5, 2013
  59. Chemistry

    What is the percent by mass of glucose in a solution containing .15 mol of glucose dissolved in 410 g acetic acid? The molar mass of glucose is 180g/mol.

    asked on March 1, 2013
  60. Math please help urgent !

    Find the slop of the tangent to the curve y=(10-sqrt x)(5+sqrt x) at x=25

    asked on February 29, 2012
  61. history

    The Philippine-American war was A) a minor event for americans B) more costly than the spanish american war C) fought in a traditional manner D) never completely resolved E) over even before the spanish american war

    asked on February 2, 2012
  62. history

    Hi I was wondering if someone could please help me with this question: What was the place of residence of the Ho-Chunk war chief Red Bird? I have searched many places and have had no luck finding the answer. Thanks much! =)

    asked on October 9, 2011
  63. geometry

    Using the information about John, Jason, and Julie, can you uniquely determine how they stand with respect to each other? On what basis? Statement 1: John and Jason are standing 12 feet apart. Statement 2: Julie is standing 31º NW of Jason. Statement 3:

    asked on July 20, 2011
  64. St monica

    Bill and Amy want to ride their bikes from their neighbourhood to school which is 14.4 kilmeters away. It takes Amy 40 mins to arrive at school. Bill arrives 20 mins after Amy. How much faster (in meters/second) is Amy's average speed for the entire trip?

    asked on July 5, 2011
  65. literature

    novel phrase the domesticated generation fell from him ?

    asked on May 17, 2011
  66. math

    What is the average area of a theme park? Thanks!

    asked on April 15, 2011
  67. pharmacy

    importance of uniformity of weight test in pharmacy

    asked on September 11, 2010
  68. Trignometry

    An isosceles triangle has two sides of length w that make a 2á-degree angle. Write down two different formulas for the area of this triangle, in terms of w and á (Greek “alpha”). By equating the formulas, discover a relation involving sin 2á, siná,

    asked on April 12, 2010
  69. Physics

    A string has a linear density of 6.7 x 10-3 kg/m and is under a tension of 210 N. The string is 1.6 m long, is fixed at both ends, and is vibrating in the standing wave pattern shown in the drawing. Determine the (a) speed, (b) wavelength, and (c)

    asked on November 30, 2009
  70. chemistry

    Please help me with this one. You are trying to dissolve oxygen in water. Will you be successful? Explain your answer.

    asked on April 19, 2007
  71. chemistry

    Why if you dissolve cobalt chloride solution in distilled water and then pour acetone in it, the bottom part of the graduated cylinder is red and the top part is blue? What do you mean by it has one color with water of crystallization? CoCl2*6H2O is a

    asked on April 11, 2007
  72. History

    In response to which acts did colonial opposition become violent? (Select all that apply.) Stamp Act Tea Act Townshend Acts Sugar Act I think it is all, except the Townshend Acts.

    asked on August 9, 2019
  73. history

    The _______________addresses many of the concerns raised by the Declaration of Independence, including freedom of speech, the press, religious practice, assembly, and petition. First Amendment Magna Carta Federalist Papers Second Amendment The first ten

    asked on November 7, 2018
  74. history

    Because every day Americans vote on representatives who in turn vote on legislation, rather than Americans voting on issues directly, our system of government is known as a _____________. republic nation constitutional monarchy democracy The 3/5ths

    asked on November 3, 2018
  75. math

    Sinea wants to spend money using the same ratios as on her last trip to the carnival. If she spends $28 on games, how much will she spend on souvenirs? Snacks Games Souvenirs Sine $5 $8 $18

    asked on October 13, 2018
  76. History

    Which best describes how European powers of the 16th century used the economic theory of mercantilism to grow their wealth? A) European nations maximized the sale of exports and established tariffs to restrict colonies from trading with foreign nations. B)

    asked on September 22, 2018
  77. Math

    the three vertices of rectangle ABCD are A(2, 1) , B(6, 1) , C(6, 4).Find the coordinates of D. Please help me,thank you.

    asked on October 15, 2017
  78. Math

    Find the coordinates of the midpoint of (2/3, -3/2)and (8/3, -11/2).help me please

    asked on October 14, 2017
  79. Math

    A man will pay RM 46000 to renovate an office . If the construction materials cost 25% more and the labour costs 30% more , he will need to pay RM 58540. Find the original cost of the construction meterial and the cost of labour .(Used equation)

    asked on October 10, 2017
  80. S.S.

    Which statement best describes the framework of government established by the Constitution? A. The three branches of government defer the majority of power to the states B. A system of checks and balances keeps each of the three branches from having too

    asked on September 6, 2017
  81. chemistry

    two everyday chemical reactions then after you have chosen your two everyday chemical reactions List the two reactions and their chemical equations. Also, state each reaction's type (synthesis, decomposition, displacement, or combustion). please help

    asked on September 3, 2017
  82. chemistry

    Are Si valence electrons shared? Are C valence electrons shared? please help

    asked on August 31, 2017
  83. chemistry

    How can the concept Independent Variable v Dependent Variable apply in your life? please help

    asked on August 17, 2017
  84. science

    What physical property is changed when a waitress pours coffee from a pot into four mugs? density color volume temperature

    asked on August 17, 2017
  85. math

    Can you please help me simplify this into one fraction? 3/(x-3) - 5/(x/2) Here are the options: A) -2x+9/(x-3)(x-2) B) -2x/(x-3)(x-2) C) -2x-9/(x-3)(x-2) D) 2x+9/(x-3)(x-2) I think it's option D but I'm not so sure :(

    asked on June 9, 2017
  86. Chemistry

    Please help me these are the only two I have left. 17. If the solubility of a gas is 5.6 g/L at 505 kPa pressure, what is the solubility of the gas when the pressure is 1010kPa? * 19. Calculate the [H⁺] for the aqueous solution in which [OH⁻] is 1

    asked on March 14, 2017
  87. Chemistry

    Can someone check my answer and let me know me if the are right or wrong. 1. What is the maximum amount of KCl that can dissolve in 600 g of water? (The solubility of KCl is 34 g/100 g H₂O at 20°C.) * 34 g 204 g ***** 2040 g 3. (1 point) If the

    asked on March 13, 2017
  88. Science

    When calculating delta Tsample,why is th initial temperature taken to be 100 degrees Celsius

    asked on March 1, 2017
  89. Math

    The temperature at 6:00 pm was 33°f.over the course of the day, the temperature decreased 5.5°F per hour. What was the temperature at midnight?

    asked on October 26, 2016
  90. english

    Nwoye and Ikemefuna as a representation of the rise of new cultural formation among the igbo society in Achebe's Things Fall Apart

    asked on October 22, 2016
  91. english

    Chinua Achebe's Things Fall Apart as a Postcolonial novel

    asked on October 22, 2016
  92. english

    Chinua Achebe's Things Fall Apart as a defiance of eurocentric sociological and anthropological narration of South Africa

    asked on October 22, 2016
  93. Math

    if 6 workers complete a 1 km of roadway in 4 days. how long would it take for 4 workers to complete 3 km of roadway

    asked on August 4, 2016
  94. Trigonometry

    Suppose *u* is a quadrant IV angle with cos(u) = 3/5. Suppose *v* is a quadrant IV angle with cos(v) = 12/13. Find the exact value of sin(u-v) I have gotten to sin120cos150 - sin150cos120 but I am not sure I am correct up to that point and I don't know

    asked on April 17, 2016
  95. Math

    A tennis racket is offered at 25% off. Including 7% sales tax, the final price is $67.41. What is the original price, without tax or discount?

    asked on March 24, 2016
  96. Science (Physics)

    Air becomes a conductor when the electric field strength exceeds 3.00 × 106 N/C. Determine the maximum amount of charge that can be carried by a metal sphere 8.5 m in radius. The value of the Coulomb constant is8.99×109 N·m2/C2. Answer in units of C. I

    asked on February 29, 2016
  97. physics

    Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) direction for the

    asked on January 30, 2016
  98. physics

    Can anyone help just can figure it out. Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a)

    asked on January 30, 2016
  99. physics

    Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) direction for the

    asked on January 30, 2016
  100. geometrie

    (4, 5)'(9, 5) and (5,1) are three of a quadrilateral whose opposite sides are equal and parallel.there are three possibilities for the co-ordinates of the missing vertex.Find all three,and draw the three quadrilateral on a grid

    asked on December 12, 2015

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