# patrick

Popular questions and responses by patrick
1. ## chemistry

Am I correct? Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars everyday. Although the actual process also requires water, a simplified equation (with rust shown as iron(III) oxide (Fe2O3) is:

2. ## AP Chemistry

(a)calculate the mass percent of carbon in the hydrated form of the solid that has the formula BeC2O4 X 3 H2O (s). I divided 24.02 g by 151.08 g and got .16, or 16%. is that correct? Also, I'm having trouble with this follow up question. When heated to 220

3. ## chemistry

Calculate Delta G for each reaction using Delta Gf values: answer kJ ...thank you a) H2(g)+I2(s)--->2HI(g) b) MnO2(s)+2CO(g)--->Mn(s)+2CO2(g) c) NH4Cl(s)--->NH3(g)+HCl(g) is this correct? a) H2(g)+I2(s)--->2HI(g) From tables: G HI = +1.3 kJ/mol G H2 = 0 G

4. ## Chemistry

Which ligand binds the tightest? Ligand A, with a Kd of 10^-9M Ligand B, with a Kd of 10^-3M Ligand C, with a percent occupancy of 30% at one micromolar Ligand D, with a percent occupancy of 80% at 10 nm

5. ## Math

Rafi had a board that was 15 1/2 feet long. He cut three pieces off the board that are each 3 7/8 feet long. How much of the board is left? I am confused on how to figure out the answer for the above.

6. ## chemistry

The weak acid HQ has pKa of 4.89. 1)Calculate the [H3O+] of .035 M HQ. 2)Calculate the (OH-) of 0.500 M HQ ....Am I correct? a) pKa = 4.89 => - log(Ka) = 4.89 => Ka = antilog(- 4.89) = 10-4.89 = 1.29x10-5 1. Given concentration of HQ, C = 0.035 M

7. ## Math-Sue

Olivia ties 2.5 feet of ribbon onto one balloon. How many yards of ribbon does Olivia need for 18 balloons? What would be the process on figuring out the above?

8. ## Chemistry Dr BOB

A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+ salt and the other half-cell with a Cd bar in the same volume of a 1.00 M Cd2+ salt. Report your answers to the correct number of significant figures. a)Find E degree cell, delta G degree ,

9. ## AP Chemistry

I am fairly sure that a) is no change, and c) is shifts to the right...but I am not sure about b) and d). Thanks. How does the equilibrium position shift as a result of each of the following disturbances? Sodium bicarbonate undergoes thermal decomposition

10. ## Math

What is the lowest common denominator of the four fractions listed below? 20 7/10; 20 3/4; 18 9/10; 20 18/25 a. 2 b. 40 c. 50 d. 100 Answer-a Please check the above.

11. ## Math

Leah is buying curtains for her bedroom window. She wants the curtains to hang from the top of the window to the floor. The window is 4 feet high. The bottom of the window is 2 and a half feet above the floor. What curtain length in inches should she buy?

12. ## chemistry

Consider the following balanced thermochemical equation for a reaction sometimes used for H2S production: 1/8 S8 (s) + H2 (g) ¨ H2S (g) ƒ¢Hrxn = -20.2 kJ (a)Is this an exothermic or endothermic reaction? (b)What is ƒ¢Hrxn for the reverse reaction?

13. ## physics

A 22 g bullet is accelerated in a rifle barrel 43.2 cm long to a speed of 907 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N

An art teacher has 1 1/2 pounds of red clay and 3/4 pound of yellow clay. The teacher mixes the red clay and yellow clay together. Each student in the class needs 1/8 pound of the clay mixture to finish the assigned art project for the class. How many

15. ## Calculus Help Please Urgent!!!

A cone-shaped paper drinking cup is to be made to hold 30 cm^3 of water. Find the height and radius of the cup that will use the smallest amount of paper. (Round your answers to two decimal places.) Height = ? Radius = ? Show work please!!!

16. ## chemistry

Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to

17. ## Math

Craig scored 12 points in a game. Marla scored twice as many points as Craig but 5 fewer points than Nelson scored. How many points did Nelson score? a. 2x12+5 b. 2 x 12 -5 c. 1/2 x 12 + 5 d. 2 x (12 + 5) Answer-b Can you please check on the above.

18. ## Language Arts

Underline the prepositional phrase in each sentence below. 5. The girl look behind the door for her friend-I feel that behind the door would be the prepositional phrase 6. Don't leave without your coat. -Underline without your coat. 7. During lunch we had

19. ## chemistry

How many moles of H3O+ or OH- must you add per liter of HA solution to adjust its pH from 9.75 to 9.01? Assume a negligible volume change. ……….x 10………Moles of ……………………..h3O+ or OH- I got 4.6001 x 10-5 M of h3o+...but it was

20. ## Math

Susie spent 4 1/4 hours on Monday and 3 5/8 hours on Tuesday working on a history project. About how long did she spend working on the project? a. 1 hour b. 7 hours c. 8 hours d. 9 hours Answer: 8 hours I first found the common denominator which is 8 and

21. ## Math

Ava's bedroom rug is 2 3/4 feet long and 2 1/2 feet wide. What is the area of the rug? How do I go about figuring out the answer to the above? It seems to be very extremely complicated.

22. ## Language Arts

Draw a circle around the action verb in each sentence. On the line, tell whether the verb is past tense, present tense, or future tense. 1. Daniel will choose a baseball bat. -Circle will choose and it is present 2. He steps up to the plate.-Circle steps

23. ## Math

1. Quinn spent \$16.49 for 3 magazines and 4 sheets of stickers. The magazines cost \$3.99 each and the sales tax was \$1.02. Quinn also used a coupon for \$1.50 off her purchase. If each sheet of stickers had the same cost, how much did each sheet of stickers

24. ## Math

Determine whether the event is impossible, unlikely, as likely as not, likely, or certain. Then tell whether the probability is 0, close to 0, 1/2, close to 1 or 1. Picking a number that is divisible by 5 from a jar with papers labeled from 1 to 12. The

25. ## Language Arts

Directions: Underline the prepositional phrase in each sentence below 9. For a fraction of the cost you can buy a watermelon.-underline for a fraction 10. The boy tried to finish the race at any cost-underline at any cost. 11. At noon we all went to lunch.

26. ## Language Arts

Directions: Underline the prepositional phrase in each sentence below, and circle the direct object. 1. The man sat on top of the historic rock. 2. The baseball was just out of reach from the boy. 3. They were about to win the championship. 4. He felt

27. ## Math

Use the circle graph to determine how many hours per day Becky spends on each activity. School=25% Eating=10% Sleep=40% Homework=10% Freetime=15% I think my answer would be 25/100=x/1 4 hours Can you please check my answer,Please help me I am a little

28. ## Early Childhood Education

What are disadvantages of using puppets with children

29. ## chemistry

Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on decomposition. 2 H2O2(l) 2 H2O(l) + O2(g) Hrxn = -196.1 kJ How much heat is released when 529 kg H2O2 decomposes? ( ......... ) KJ *note ..watch sig figs . my

30. ## Statistics

Calculate each binomial probability: a. Fewer than 4 successes in 12 trials with a 10 percent chance of success. b. At least 3 successes in 7 trials with a 40 percent chance of success. c. At most 9 successes in 14 trials with a 60 percent chance of

31. ## chemistry

What is the (H3O+) and the ph of a buffer that consists of 0.25M HNO2 and 0.69M KNO2? (Ka of HNO2 = 7.1 x 10^-4) is this right? pH of acidic buffer pH = pka + log(salt/acid) pka = -log ka = -log(7.1*10^(-4)) = 3.15 = 3.15+log(0.25/0.69) pH = 2.71 [H3O+] =

32. ## Math

A farmer divides 20 acres of land into one fourth acre sections. Into how many sections does the farmer divide her land? Please let me know how do I go about figuring the above?

34. ## Language Arts

Write S if the underlined word is a subject pronoun. Write O if the word is an object pronoun. 1.We learned about the Anasazi people. We is underlined and this is a subject pronoun 2. They built a civilization in the Southwest. They is underlined and this

35. ## calculus

Give a possible formula for the illustrated function using a vertical shift of an exponential function. The two points marked on the graph are A=(−172) and B=(10). The red horizontal line is given by y=−3, and is a horizontal asymptote of the function

36. ## language arts

are my feet are killing me is a alliteration, personification , or hyperbole?

37. ## Physics

Consider the following four possibilities for two point charges and choose the one(s) that do not change the magnitude of the electrostatic force that each charge exerts on the other: A. Double the magnitude of each charge and double the separation between

38. ## BIOLOGY

Heat exhaustion caused by a person's exposure to heat can result in weakness or collapse. It usually involves a decrease in blood pressure. Explain why the homeostasis adjustment to heat can cause a drop in blood pressure. ---------- I'm not sure if I'm

39. ## Physics

The seesaw in the figure below is 4.5 m long. Its mass of 20 kg is uniformly distributed. The child on the left end has a mass of 14 kg and is a distance of 1.4 m from the pivot point while a second child of mass 39 kg stands a distance L from the pivot

40. ## Math

Javier bought 48 sports cards at a yard sale. Of the cards, 3 over 8 were baseball cards. How many cards were baseball cards? How would I go about figuring out the answer? I am confused.

41. ## chemistry

A chemist decomposes several samples of carbon monoxide into carbon and oxygen and weighs the resultant elements. The results are shown below: Sample Mass of Carbon Mass of Oxygen 1 6 8 2 12 16 3 18 24 Do you notice a pattern in these results? Next, the

42. ## Math

A rectangular tank 40cm wide by 50 cm long by 30 cm high is filled up with water up to 2/3 of its height .water flows from a tap into the tank at a rate of 0.5 liter per minute. Find the amount of water in the tank after 30 minutes. Give your answer in

43. ## Math

There are 45 vehicles in a parking lot. Three fifths of the vehicles are minivans. How many of the vehicles in the parking lot are minivans? I am confused on how to figure out the above answer. Would you be able to assist me with this please.

44. ## chemistry

Codeine (C18H21NO3) is a narcotic pain reliever that forms a salt with HCl. What is the pH of 0.064 M codeine hydrochloride (pKb of codeine is 5.80)? Thank you.

45. ## Chemistry

I was doing a lab experiment on the reaction of copper(II) sulphate and aluminum: 1) I measured 2.02g of copper(II) sulphate pentahydrate 2) I dissolved the copper(II) sulphate pentahydrate in 10mL of distilled water 3) I added 2.0mL of concentrated HCl to

46. ## Math

A spinner has 3 equal sections that are red, white, blue. What is the probability of not landing on blue? My answer 2 out of 3 or 2/3 is the probability of not landing on blue. Is this correct?

47. ## math

Meg's pension plan is an annuity with a guaranteed return of 3% per year (compounded quarterly). She would like to retire with a pension of \$50,000 per quarter for 5 years. If she works 21 years before retiring, how much money must she and her employer

48. ## Geometry

44. The volume of a sphere is 2,098 m3. What is the surface area of the sphere to the nearest tenth? (1 point) 1,700 m2 146.2 m2 850 m2 26,364 m2

49. ## Math

What is the difference in minutes between the shortest collection times before and after the well was installed? Box Plot 1 25 to 35 Box Plot 2 45 to 64 What numbers do I need to subtract? 64-45 and 35-25 and then find the difference between those? I am

50. ## Math Questions

Find Part of a Group Use a model to solve. 7/8 x 16= Answer: 14 8x2=16 7x2=14 6/10x10=6 10x1=10 6x1=6 Please let me know if I have the above answers correct? Thank you

51. ## chemsitry

1)Balance the following gas-phase reaction and 2) write its reaction quotient, Qc: CH4(g)+F2(g)......>>.....

52. ## Physics

Find the work done in stretching the spring. Answer in units of J

53. ## Chemistry

Care must be taken when diluting sulfuric acid with water, because the dilution process is highly exothermic: H2SO4(l) "arrow" H2SO4(aq) + heat a) Find the ÄHo for diluting 1.00 mol of H2SO4(l) (d = 1.83 g/mL) to 1 L of 1.00 M H2SO4(aq) (d = 1.060 g/mL).

54. ## Math

Yvette earned \$66.00 for 8 hours of work. Lizbeth earned \$68.80 working the same amount of time. How much more per hour did Lizbeth earn than Yvette earned? a. \$0.35 b. \$0.45 c. \$2.80 d. \$8.25 Answer-c Please check the above.

55. ## Geometry

The angle of elevation of a ladder leaning against a wall is 45°. If the distance from the base of the ladder to the wall is 15 feet, find the length of the ladder.

56. ## chemistry

Assume water boils at 100.0 C in Houston(near sea level) and at 90.0 C in Cripple Creek Colorado(near 9, 500 feet). If it takes 4.7 min to cook an egg in Cripple Creek and 4.4 min in Houston, what is Ea for this process? Enter your answer in scientific

57. ## chemistry

Whenever organic matter is decomposed under oxygen free conditions, methane is one of the products. Thus enormous deposits of natural gas, which is almost entirely methane, serve as a major source of fuel for home and industry (dHrxn for the combustion of

58. ## chemistry..anybody!

I don't know why it was marked wrong. This is what it said: Where is the 5.64 coming from? Is this a typo?(thank you) HINT To balance the equation, make sure that the number of each atom on the reactant side is the same as the number on the product side.

59. ## Math

A student wrote this statement: "A triangular prism has a height of 15 inches and a base area of 20 square inches. The volume of the prism is 300 square inches." Identify and correct the error. I am not sure because I am new at doing this kind of math.

60. ## Math

Using the words listed below fill in the blanks with the correct number type Real Number, Rational Number, Integer, Whole Number, Irrational Number 3) 0.12 - Rational and Real number I am not sure about the rest. Am I correct on this? 4)

61. ## Language Arts

Circle the correct form of the pronoun 1. Jane and Sarah said (she, they) were too tired to skate any longer. Circle they 2. Either Bill or John will bring a sample of (his, their) own work. Circle their 3. Jane and Jill called (her, their) friend. Circle

62. ## physics

A puck on a horizontal, frictionless surface is attached to a string that wraps around a pole of finite radius, as shown in the figure . As the puck moves along the spiral path, does its speed increase, decrease, or stay the same?

63. ## Math

What is the best estimate for the quotient. 5,397 division sign 62 a. 80 b. 90 c. 800 d. 900 My answer to the above is b Can you please double check my answer and let me know if I am right or wrong

64. ## Math

Jaime graphed linear data in the form (cost, number). The y-intercept was 0. Jayla graphed the same data in the form (number, cost). What was the y-intercept of her graph? Complete the explanation. Jaime's graph contained (0,1) (0,0) or (1,0). Since

65. ## Chemistry

During the combustion of 5.00 g of octane, C8H18, 239.5 kcal is released. a) What is the sign of (delta)H for this reaction? b) How much energy is released by the combustion of 1.00 mol of C8H18

66. ## Math

Define the variables for each situation. Then write an equation. 7) Jana's age plus 5 equals her sister's age. J + 5=x Would this be correct? 8) Andrew's class has 3 more students than Lauren's class. L + 3=A Is this correct?

67. ## chemistry

Calculate K at 298 K for the following reactions. NO(g) + 1/2 O2(g)......> NO2(g) Nog 86.60 No2 g 51 o2.... O I got 6.81 x 10^-7........thank you.

68. ## Math

What is the shortest time it takes to collect a container of water? This is from a Box Plot. The answer choices are: 45 minutes 56 minutes 64 minutes 53 minutes 48 minutes 48 minutes is the lower quartile 56 minutes is the upper quartile 53 is the number

69. ## chemistry DR BOB

A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+ salt and the other half-cell with a Cd bar in the same volume of a 1.00 M Cd2+ salt. Report your answers to the correct number of significant figures. a)Find E degree cell, delta G degree ,

70. ## Math

Kaylee,a residential builder,is working on a paint bugit for a custom designed home she's building.A gallon of paint costs \$38.50,and its label says it covers about 350 square feet. A. Explain how to calculate the cost of paint per square foot.find this

71. ## Accounting

Jay Pembroke started a business. During the first month (April 20--), the following transactions occurred. Invested cash in business, \$18,428. Bought office supplies for \$4,433: \$1,896 in cash and \$2,537 on account. Paid one-year insurance premium, \$1,003.

72. ## Math

For each situation first write and equation in the form of y=mx + b. Then solve each problem. A farm has 75 acres of wheat. The farmer can harvest the wheat from 12 acres per day. In how many days will all of the fields be harvested? y=12x + 75 74/12=6.25

73. ## Math

A bakery used 4 cups of flour to make a full size cake. If they wanted to make a cake that was 0.5 the size, how many cups of water would they need.

74. ## Math

How do you divide 54 by 6.75

75. ## Math

Paulina works out with a 2.5 kilogram mass. What is the mass of the 2.5 kilogram mass in grams? Please help to be able to figure out the answer.

76. ## chemistry

Care must be taken when diluting sulfuric acid with water, because the dilution process is highly exothermic: H2SO4(l) "arrow" H2SO4(aq) + heat a) Find the ÄHo for diluting 1.00 mol of H2SO4(l) (d = 1.83 g/mL) to 1 L of 1.00 M H2SO4(aq) (d = 1.060 g/mL).

77. ## Math

Jake can carry 6 1/4 pounds of wood in from the barn. His father can carry 1 5/7 times as much as Jake. How many pounds can Jake's father carry? Answer: 1 3/28 Can you please double check the above answer. I don't know if it is right or wrong. 2. A glass

78. ## Math

Jamal is making pancakes. He has 6 and three fourth cups of batter, but he needs a total of 12 cups. How much more batter does Jamal need? How do I go about figuring the above problem out?

79. ## Literature

1 - In Ulysses by Alfred, Lord Tennyson, Ulysses is unhappy because: a - he's idle. b - the war has started. c - he has to leave his son. d - he's no longer leader of his country. Are these correct? MY ANSWER: A 2 - What crisis does Ulysses face? a - war.

80. ## Math

1. The base of a fountain is rectangular. Its dimensions are 1 2/3 feet by 2 2/3 feet. What is the are of the base of the fountain? I am confused on how to figure this out. Please help. 2. Bills living room floor is covered with carpet tiles. Each tile s 1

81. ## Math

The names of the students in Mr. Hayes' math class are written on the board. Mr. Hayes writes each name on an index card and shuffles the cards. Each day he randomly draws a card and the chosen student explains a math problem at the board. What is the

82. ## Lnguage Arts

There is a paragragh and I have to circle dependent clauses an underline independent clauses. The paragraph is as follows: Although some people are afraid of ninjas, since they kill tons of people, I think they're cool. Because Ninjas have so many enemies,

83. ## Language Arts

Directions. Identify the tense of each underlined verb. Write past, present or future. In this assignment there is nothing underlined. 1. You will enjoy this book about inventions. -Future 2. Inventors create new machines. -Present 3. Each machine does a

84. ## chemistry

Calculate K at 298 K for the following reactions. NO(g) + 1/2 O2(g)......> NO2(g) Nog 86.60 No2 g 51 o2.... O I got 6.81 x 10^-7........thank you.

85. ## Math

Determine whether each event is impossible, unlikely, as likely as not, likely or certain. Then tell whether the probability is 0, close to 0, 1/2, close to 1 or 1. 2. Randomly picking a green card from a standard deck of playing cards. My answers is that

86. ## Math

Which of the following is the best estimate for the total weight of these cold meats: 1 and seven eights pounds of Bologna, one and a half pounds of ham, and seven eights pound of roast beef? How would I add these fractions? Please help

87. ## Chemistry

The vapor pressure of liquid chloroform, CHCl3, is 400.0 torr at 24.1 degrees Celsius and 100.0 torr at -6.3 degrees Celsius. What is delta Hvap of chloroform?

88. ## chemistry Dr. Bob

Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to

89. ## Chemistry

Question asking about how enzymes affect the rate of a reaction. Check all that apply 1. They shift the reaction equilibrium towards the products. 2. They increase the concentration of the reactants. 3. They lower the activation energy of the reaction. 4.

90. ## Math

The ratio of strawberry to bannana is 2:3 We need 30 cups of batter total. How much banna batter do we need to make? How do I find this out? Please help

91. ## chemistry

Sucrose (C12H22O11, table sugar) is oxidized in the body by O2 via a complex set of reactions that ultimately produces CO2 (g) and H2O (g) and releases 5.16x10^3 kJ/mol sucrose. a) Write a balanced thermochemical equation for this reaction. Make sure to

92. ## Math

Eli's Dad made him a birthday cake, but forgot to buy candles. He could only find a few. But Eli was smart in math, so his Dad said "The ratio of candles to years is 3 to 5" That gave him the right number. How old was Eli? I am very confused on how to even

93. ## Probability and Statistics

A certain system can experience three different types of defects. Let Ai (i = 1,2,3) denote the event that the system has a defect of type i. Suppose that P(A1) = 0.34, P(A2) = 0.33, P(A3) = 0.43, P(A1 ∪ A2) = 0.6, P(A1 ∪ A3) = 0.64, P(A2 ∪ A3) =

94. ## chemistry

A 49.3 g sample of ethylene glycol, a car radiator coolant, loses 624. J of heat. What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol = 2.42 J/gK)? 624= 49.3 x 2.42(T-32.50) T = 37.73 = 38degrees is

95. ## Acid-base titration

A weak acid HA (pKa = 5.00) was titrated with 1.00 M KOH. The acid solution had a volume of 100.0 mL and a molarity of 0.100 M. Find the pH at the following volumes of base added and make a graph of pH versus Vb: Vb = 0, 1, 5, 9, 9.9, 10, 10.1, and 12 mL.

96. ## Physics

A positive charge Q is on the y-axis at a distance a from the origin, and another positive charge q is on the x-axis at a distance b from the origin. A) For what values(s) of b is the x-component of the force on q a minimum? B) For what values(s) of b is

97. ## statistics

The mean lifetime of a sample of 100 light tubes is 1570 hours with a standard deviation of 80 hours test the hypothesis that the mean lifetime of the tubes is 1600 hours

98. ## Math

Marco drew 20 pictures. He drew 3/4 of them in art class. How many pictures did Marco draw in art class? Answer: 15 pictures Caroline has 10 marbles. One half of them are blue. How many of Caroline's marbles are blue? Answer: 5 marbles What is the value of