# EMMA

Most popular questions and responses by EMMA
1. ## Chemistry

What would the net ionic equation be for : HBr (aq) + KOH (aq) = KBr + H2O

2. ## Language Arts

Hi! I just need someone to check my work please! :) Thanks! 1. Which of these is the defining characteristic of a comparison-and-contrast essay? A. Clear thesis statement. B. Organizational structure. C. Reliable sources. D. Similarities and differences

3. ## Math

Hi! I just want someone to check my answers please! I cannot provide you with any pictures as I have gotten them off of my schools website. You cannot access these pictures because you have to be logged in. 1. Andrea drew triangle JKL as shown. A. The sum

4. ## Language

In "All Together Now," why does Barbara Jordan most likely mention the conflict in Bosnia? A.It shows that people of different ethnic backgrounds can live in peace. B.It shows that improvements in race relations are still necessary despite past progress.

5. ## Chemistry

A battery is constructed based on the oxidation of magnesium and the reduction of Cu^2+. The initial concentrations of Mg^2+ and Cu^2+ are 1.2*10^-4M and 1.5M, respectively, in 1.0-L half-cells. The initial voltage of the battery is 2.83V with the standard

6. ## Chemistry

What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 4.40 L of an NaOH solution with a pH of 10.5?

7. ## Math

1. Simplify. 3x^2+ 5x-5x^2-4x+5-2 A.-8x^2-9x+3 B.2x^2+x+3 C.-2x^2-9x+3*** D.-2x^2+x+3 2. Add or Subtract.(8x – 2y) + (3x – 4y) A.11x+8y B.4x-y C.11x-6y*** D.5x+2y 3.(5x^2-4x-1)-(-4x^2-4) A.-9x^2-8x-1 B.9x^2-4x+3*** C.x^2-4x-3 D.9x^2+4x-3 4.The distance

8. ## calculus

In the space below, provide the smaller of the two positive integers that add to 40 and have the largest possible product

9. ## history

How did feudal monarchs in the High Middle Ages centralize power? need explanation

10. ## Economics

Can someone check my answers? "Explain how unemployment affects the following groups. Give at least 3 examples for each of the groups; Laborers, Businesses, and Government" Laborers: 1) No longer has a job 2) Families can hurt from lack of money 3)Poor

11. ## Math

A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute.

12. ## calculus

If 800 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is the maximum area that can be enclosed? Answer to the nearest square foot without commas. For example, if the answer is 1,000, write 1000.

13. ## math

Mr. Smith is purchasing a \$190000 house. The down payment is 20% of the price of the house. He is given the choice of: (A) a 20-year mortgage at a rate of 6%. Find: (i) The monthly payment: \$ (ii) The total amount of interest paid: \$

14. ## math miss.sue can u plz check me answers plz

which of the following appears to be an irrational number? A. 3.7272727272... B. the root of 64 C. -6/25 D. 0.73303330...

Alisha bought a collection of 500 old pennies. She chose 20 pennies from the collection and recorded their dates. Seven pennies had dates earlier than 1980. What percent of the pennies in Alisha’s collection have dates earlier than 1980? How would I

16. ## chemistry

what is the strongest intermolecular force in nitrogen trifluoride

17. ## science

A banana turning brown when exposed to the air is an example of

18. ## Urgent math

The initial size of a culture of bacteria is 1000. After one hour the bacteria count is 4000. (a) Find a function n(t) = n0ert that models the population after t hours. n(t) = b)Find the population after 1.5 hours. (Round your answer to the nearest whole

19. ## History

Hey! Just Want A Quick Check Over My Answers! 1. How Did The Zimmermann Note Lead The United States Closer To War? A. It Caused The United States To End Diplomatic Relations With Germany. * B. It Resulted In More U-Boat Attacks On American Ships. C. It

20. ## algebra

does the data in the table represent a linear function? if so, wirte a rule for the function. (below is what the table looks like) x | -2| -1| 0 | 1| 2| y | -7| 1| 8 | 17| 25| answer choices yes; y = 8x +9 yes; y = 8x + 8 no yes; y = 1/8x + 8

21. ## Chemistry

The complex ion, [Ni(NH3)6]2+, has a maximum absorption near 580 nm. Calculate the crystal field splitting energy (in kJ/mol) for this ion.

22. ## science

A geneticist is studying a pedigree that shows the family history of a recessive genetic disease. Which of the following pedigrees shows an impossible relationship? (

23. ## alg 1

It takes a florist 3 hour and 15 minutes to make 3 small centerpieces and 3 large centerpieces. It takes 6 hours and 20 minutes to make 4 small centerpieces and 7 large centerpieces. How long does it take to make each small centerpiece and each large

24. ## Chemistry

A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 338.mg of oxalic acid H2C2O4 , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250.mL of distilled water. The

25. ## English

I have to read the book 'Nethergrave' by Gloria Skurzynski, but the online book doesn't seem to want to open on either of my computers so I assume the site is down. Does anyone know where I could find the book somewhere else online, I've been searching

26. ## Chemistry

The temperature rises from 25.00 °C to 29.00 °C in a bomb calorimeter when 3.50 g of sucrose undergoes combustion in a bomb calorimeter. Calculate ÄErxn for the combustion of sucrose in kJ/mol sucrose. The heat capacity of the calorimeter is 4.90 kJ/°C

27. ## calculus

The area A = πr2 of a circular water ripple changes with the radius. At what rate does the area change with respect to the radius when r = 4ft?

28. ## Geography

What did the Han emperors do to keep the economy stable A. Stopped merchants from selling goods along the Silk Road B. Brought grain, stored it, and resold it during times of low harvest C.introduced the first standardized coins D. Refused to allow

29. ## geometry

Campsite F And G Are On Opposite Sides Of The Lake.A Survey Crew Made Measurements Shown On The Diagram .What Is The Distance Between The Two Campsites?

30. ## Math

Which best describes best describes your ability to graph inequality

31. ## Trigonometry

Given that sin^2x = 4/13, what is the cos^2x? I am so lost. I need to show my work. Please help. THANK YOU!

32. ## Chemistry

Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144°C. Pure

33. ## Chemistry

Which of the following is NOT true for ΔGrxn? A.) If ΔG°rxn > 0, the reaction is spontaneous in the forward direction. B.) If Q = 1, then ΔGrxn = ΔG°rxn.If ΔG°rxn = 0, the reaction is spontaneous in the reverse direction. C.) If ΔG°rxn > 0, the

34. ## Chemistry

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.140 M HClO(aq) with 0.140 M KOH(aq).HClO is a weak acid with a Ka of 4.0× 10–8. It reacts with strong base to produce ClO–. (e) after addition of 60.0 mL of KOH

35. ## math

you invest \$4000 in an account that pays simple interest of 6% for 30 years. calculate the amount of money you'll have at the end of the indicated time period.

36. ## Pre-Algebra A

A company reports \$23,765 in income and \$18,945 in expenses for February. What was the amount of profit or loss for the month? A. \$4,820 profit B. \$4,820 loss C. \$5,220 profit

1. Tony decides to use observation. He visits 10 students and observes them doing schoolwork at home for 30 min. If a student looks at social media during that time, he notes it. (a) Provide an advantage of using observation. (b) Provide a disadvantage of

38. ## Honors English 11

Can someone check my answer please? Q: Read and analyze "When I heard the learn'd Astronomer" by Walt Whitman. What romantic ideas does it express, and how does the structure of the poem reinforce the meaning? -When i heard the learn'd astronomer; When the

39. ## Psychology

9.By means of introspection, Dr. Marsh attempts to determine the components of things like perception, thinking, and consciousness. By contrast, Dr. Smyth wants to understand what the mind does in producing different kinds of behavior. We can reasonably

40. ## Chem

Separate the following balanced chemical equation into its total ionic equation. AgNO3​(aq)+NaCl(aq) --> NaNO3​(aq)+AgCl(s) (List the ions in order of the above equation.) Write the net ionic equation for the reaction above. (Make sure the cation is

41. ## science

The radius of the Earth is approximately 3,960 miles. Find the approximate surface-area-to-volume ratio of the Earth. A. 0.00025 B. 0.00076 C. 1,320 D. 11,880

42. ## Algebra

Which is an equivalent form of the expression 1800(1.2)–t? Is 1800(1/2)^t correct?

43. ## Physics

On an aircraft carrier, a jet can be catapulted from 0 to 155 mi/h in 2.00 s. If the average force exerted by the catapult is 5.53×106 N what is the mass of the jet?__________ kg

44. ## Geography

What was the result of the development of the Silk Road

45. ## Chemistry

How many atoms of carbon are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

46. ## History

1.Which answer best describes a reason why industries flourished in New England? A- The people in New England had more work experience. B- New England had more lakes to use for water in factories. C- The soil was better than in the South so they could grow

47. ## physics help plz

One 3.5 kg paint bucket is hanging by a massless cord from another 3.5kg paint bucket, also hanging by a massless cord, as shown in the figure . Part a) If the buckets are at rest, what is the tension in lower and higher cord ? Part b)If the two buckets

Question #1 A 0.140kg- baseball traveling 30.0m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 14.0cm . What was the magnitude of the average force applied by the ball on the glove? question #2 How much tension must a

49. ## Math-Probability

A law firm has six senior and fourteen junior partners. A committee of 3 partners is selected at random to represent the firm at a conference. What is the probability that at least one of the junior partners is on the committee?

50. ## ENGLISH

3. What is the rhyme scheme of the following Anne Bradstreet poem? To Her Father with Some Verses Most truly honored, and as truly dear, If worth in me or ought I do appear, Who can of right better demand the same Than may your worthy self from whom it

52. ## environment

Oil spills and leaks in the Pacific Ocean have harmed marine organisms and the environment. Which kind of environmental issue is illustrated by this example?

53. ## history

what was the napoleonic code?

54. ## Geometry

Three interior angles of a convex heptagon measure 125 degrees, and two of the interior angles measure 143 degrees. Which are possible measures for the other two interior angles of the heptagon? 1: 48 and 48 degrees 2: 39 and 100 degrees 3: 100 and 116

55. ## calculus

A firework is launched at the rate of 10 feet per second from a point on the ground 50 feet from an observer. To 2 decimal places in radians per second, find the rate of change of the angle of elevation when the firework is 40 feet above the ground. Type

56. ## History

Which explains why the Compromise of 1850 intensified the argument about slavery? A- People for and against slavery migrated to Western stats to influence laws. B~Free states in the West added more antislavery votes to Congress. C~The equal division of

57. ## Math

What is the combined height of 3 nickels, 2 nickles, and 1 nickle

58. ## chemistry

Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 3.45 g of hexane is mixed with 16.3 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be

59. ## Chemistry

Two fixed charges, -4μC and -5μC, are separated by a certain distance. If the charges are separated by 20cm, what is the magnitude of the electric field halfway between the charges? My textbook says that the formula for electric field is (kq)/r^2. But

60. ## chemistry

Which statement describes a chemical reaction at equilibrium? A. The forward reaction happens slightly faster than the reverse reaction. B. The reaction has stopped because all reactants have been used up. C. The forward reaction happens at the same rate

61. ## physics

question : net force of 225 N accelerates a bike and rider at 2.65m/s^2. What is the mass of the bike and rider together ?

62. ## College Physics

A 22.9-kg child is on a swing attached to ropes that are L = 1.33 m long. Take the zero of the gravitational potential energy to be at the position of the child when the ropes are horizontal. Part A)The child's gravitational potential energy when the child

63. ## Chemistry

Calculate the molar enthalpy for the following reaction. HCl(aq) + NH3 (aq) --> NH4Cl (aq). HCl = 50 ml (2.00M) NH3 = 50 ml (2.05 M) Delta T = 9.28 degrees Celsius. Ccal = 28.9J/g degrees celcius.

64. ## MATH

One light flashes every 2 minutes and another light flashes every 3.5 minutes. Suppose both lights flash together at noon. What is the first time after 1 PM that both lights will flash together ?

65. ## MATH

f 210 people said football was their favorite sport to watch, how many people were surveyed? Football is labeled on the circle graph as 42%.

66. ## physics

A shot-putter throws the shot ( mass = 7.3 kg) with an initial speed of 15.0 m/s at a 33.0 degreCalculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 1.90 m above the ground.e angle to the horizontal.

67. ## Algebra

Simplify the rational expression. State any restrictions on the variable. t^2+4t-12/t^2-4

68. ## Chemistry

combustion analysis of 63.8 mg of C,H, and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?

69. ## Social studies

Which factors influenced the growth of Christianity in East Africa select all that apply A mansa munsa's pilgrimage to Mecca B trade with Greeks and Romans C influence of a captured Syrian servent D invasion of mail's Christian military E caravans of

A box weighing 65.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. Part a) Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley

71. ## science

The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a 257 g sample, after 48 days how much will you have?

72. ## History

How were William Lloyd Garrison and the Rev. Elijah Lovejoy alike? Both lived in Boston and were Underground Railroad conductors. Both printed newspapers with antislavery messages in the North. Both used their houses as Underground Railroad stations and

73. ## History

1. How did new England's textile industry affect both children and women? a) It allowed them to earn a living wage until the age of 25. b) It gave them opportunities not available on family farms. c) It permitted them to complete their schooling. d) It

74. ## Math

If two cylinders are similar, find the scale factor of the smaller figure to the larger figure. The surface area of the smaller area is 20 pi yards squared. The surface area of the larger cylinder is 125 pi yards squared. No radius or height is given, and

75. ## History

Hai! Anyone Please Check This Answer Please! Which of the following is the most likely reason why many Mexicans were opposed to American investment in their country? A. American leaders overthrew the successful government of Porfirio Díaz.* B. Many

76. ## calculus

The height of a cylinder with a fixed radius of 4 cm is increasing at the rate of 2 cm/min. Find the rate of change of the volume of the cylinder (with respect to time) when the height is 14cm.

I am so lost and confused right now with this question. I might have a quiz. Help me understand before this pop quiz!!!! THANKYOU A diver runs horizontally with a speed of 1.2 m/s off a platform that is 10.0 meters above the water. a) how long before the

78. ## Psychology

5.Regarding the trichromatic theory of color vision, which statement is most accurate? A. The theory maintains that receptor cells are grouped in pairs, such as black-white. B. Specialized cells in the retina engage in a process called feature detection.

79. ## calculus

A 15-ft ladder rests against a vertical wall. If the top of the ladder slides down the wall at a rate of 0.33 ft/sec, how fast, in ft/sec, is the bottom of the ladder sliding away from the wall, at the instant when the bottom of the ladder is 9 ft from the

80. ## PHYSICS

a constant force of 6.00N acts on a 3.00kg object for 10.0s. what are the changes in the objects momentum and velocity?

81. ## chemistry

Choose the bidentate ligand from the substances below. A) cyanide ion B) ammonia C) EDTA D) carbon monoxide E) ethylenediamine

82. ## English

Which of these does William Wordsworth celebrate in "I Wandered Lonely as a Cloud" nature aloneness the death of reason human companionship I think either A or B, but I can't decide which.

83. ## math

The time is 6:10 Is the hour hand closer to the 6 or 7 and why?

84. ## math

Gabriel walked 100m around the perimeter playground.How long and how wide could the play ground be? give three different answers.

85. ## Chemistry

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution. What is the concentration of the H2SO4 solution (in M)?

86. ## math

Assume you want to accumulate \$125,000 for a long-range goal in 40 years. You have two choices. Plan A is an account with annual compounding and an APR of 5%. Plan B is an account with continuous compounding and an APR of 4.5%. How much of an investment

87. ## Psychology

Dr. Jones is interested in how human behavior may be genetically inherited from remote ancestors, such as chimpanzees. Her field of interest is A. chemical psychobiology. B. evolutionary psychology. C. clinical neuropsychology. D. behavioral genetics. I

88. ## Algebra

Write a recursive formula for the sequence 5, 18, 31, 44, 57, ... Then find the next term. I’m thinking that the answer is A. A. a1=-8; an=an-1+13. The next term is 70 B. a1=5; an=an-1+13. The next term is 70 C. a1=5; an=an-1-13. The next term is 83 D.

89. ## Chemistry

Suppose 0.780 of potassium iodide is dissolved in 150. mL of a 51.0mM aqueous solution of silver nitrate. Calculate the final molarity of iodide anion in the solution. You can assume the volume of the solution doesn't change when the potassium iodide is

90. ## physics

Cliﬀ divers at Acapulco jump into the sea from a cliﬀ 37.1 m high. At the level of the sea, a rock sticks out a horizontal distance of13.39 m. The acceleration of gravity is 9.8 m/s^2. With what minimum horizontal velocity must the cliﬀ divers leave

91. ## Chem

How do you do this? If 100 grams of boiling water at 100 degrees C is poured into a 100 g beaker of platinum at 0 degrees C, an intermediate temperature will result. Knowing that the specific heat of water is about 32 times larger than the specific heat of

92. ## physics

A large boulder is ejected vertically upward from a volcano with an initial speed of 39.0m/s . Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at a speed 19.0m/s upward? (b) At what time is it moving at a speed

93. ## Chemistry

Which of the following compounds can exhibit cis-trans isomerism? A) [Fe(CO)5ONO]2+ B) [Fe(CO)3(NH3)3]3+ C) [Cu(CO)5Br]+ D) [Cr(H2O)4Br2]+ E) [Fe(NH3)6]2+

94. ## maths

how do i find out the the equation of the line of symmetry for f(x)=ax^2+bx+c ? please explain it do me thanks! The line of symmetry runs through the vertex. so the x of the vertex is -b/(2a) and the equation of the line of symmetry is x = -b/(2a) e.g. for

95. ## Math

1 1/4 teaspoons baking powder per 3/8 cup flour, what is the unit rate

96. ## History

What was the impact of the Scopes Trial on education in the United States? A. It was the first significant effort to draw interest in the separation of church and state in education. B. It promoted grassroots legal efforts to fortify the need for teaching

97. ## Science

1.Infrared radiation has wavelengths ranging from about 800 nm to 1 mm. What is the frequency of radiation of wavelength 970 nm? Answer in units of s−1 . 2.Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths

98. ## algebra

All the members of a construction crew work at the same pace. Four of them working together are able to pour concrete foundations in 32 hours. How many hours would this job take if the number of workers: increased 2 times