# why was it important to cover each beaker with a piece of aluminum foil?

15,221 questions, page 25
1. ## science

The heaviest naturally occurring element is a) Uranium b) Iron c) Silica d) Aluminum

asked by raul on June 19, 2013
2. ## chem

Can I2 oxidize metallic aluminum? Show the balanced chemical equation and the Eo values.

asked by m on October 31, 2010
3. ## MSU

asked by Sarah on October 6, 2011
4. ## chemistry

Predict the products of the chemical reaction aluminum + iron(III) oxide

asked by Pedro on December 5, 2010
5. ## chem

Can I2 oxidize metallic aluminum? Show the balanced chemical equation and the Eo values.

asked by m on October 31, 2010
6. ## Science

What compound was considered more precious that gold in ancient Rome? i think it's aluminum, i found it in google In my Google search, there was no mention of aluminum as a precious metal. Rather silver, gold and bronze were mentioned, especially in

asked by Ann on February 20, 2007
7. ## algebra

in solving the equation (x +2)(x - 2) = 32 eric stated the solution to be x + 2 = 32 => x = 30 or x- 2 = 32 => x = 34. however at least one of these solutions fails to work when plugged back into the equation. why is that? please help eric to understand

asked by Theresse on September 29, 2012
8. ## Calculus

Consider the function f(x)=-2x^3+33x^2-108x+2. For this function, there are three important intervals: (-Inf,A], [A,B], [B,Inf) where A and B are the critical points. Find A and B and for each of the important intervals, tell whether f(x) is increasing or

asked by Nathan on October 29, 2013
9. ## Social plz......help

1 what is the most important issue or problem facing our word today? 2 what is the most important or problem facing our country today? 3 how should the next president address these issues? what action should he take?

asked by JAsmine on September 9, 2008

Please help I am having trouble with this question Which statement best explains why the Louisiana Purchase of 1803 was important to the development of the United States? A) It created new taxes on important goods B) It resulted in immigrants from France

asked by Kit-Kat_Gamer on January 24, 2019
11. ## plz help now, chemistry

How do you write chemical formulas? For example how so you right a chemical formula for calcium fuoride? Calcium flouride would be CaF2 This is because .. Calcium symbol - Ca Flourine symbol - F you would write CaF BUT you must consider charges calcium has

asked by Beautiful on December 21, 2006
12. ## Math

A piece of wood is 8 and 7/8 in. long is cut a piece 45 1/2 in. long. If 1/16 is wasted for the cut, how much wood is left.

asked by Sally on October 7, 2014
13. ## algebra

A basket contains 11 pieces of fruit: 4 apples, 5 oranges, and 2 bananas. Jonas takes a piece of fruit at random from the basket, and then Beth takes a piece at random. What is the probability that Jonas will get an orange and Beth will get an apple?

asked by den on January 20, 2011
14. ## math

A basket contains 11 pieces of fruit: 4 apples, 5 oranges, and 2 bananas. Jonas takes a piece of fruit at random from the basket, and then Beth takes a piece at random. What is the probability that Jonas will get an orange and Beth will get an apple?

asked by stephanie on October 13, 2011
15. ## Pre calculus

You have a wire that is 71 cm long. You wish to cut it into two pieces. One piece will be bent into the shape of a square. The other piece will be bent into the shape of a circle. Let A represent the total area of the square and the circle. What is the

asked by Hai on March 3, 2016
16. ## Algebra

5. A piece of rope is cut into two pieces. One piece is used to form a circle and the other is used to form a square. Use a length of rope of 20 feet to write a function f representing the area of the circle as a function of the length of one side s of the

asked by Ben on January 23, 2015
17. ## Science

Which of the following statements is not consistent with the results obtained in Rutherford’s gold foil experiment? A. The nucleus of an atom is positively charged. B. The nucleus of an atom contains almost all the mass of the atom. C. Atoms are composed

18. ## Chemistry

Which of the following statements is not consistent with the results obtained in Rutherford’s gold foil experiment? A. The nucleus of an atom is positively charged. B. The nucleus of an atom contains almost all the mass of the atom. C. Atoms are composed

asked by quick help needed on June 7, 2016
19. ## Chemistry

Why is it important to determine the wavelength of maximum absorption? I assume we are talking spectroscopy here? When describing the spectrum it is usual to record the wavelength of a maximum absorption (there may be several absorptions) as this is a

asked by Janna on April 24, 2007
20. ## chemistry

Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide. Materials are: *50.0 mL of 0.10 M HCl(aq) *bromophenol blue indicator *50.0 mLsaturated calcium hydroxide *50.0 mL buret *125 mL Erlynmyer Flask *50.0 mL of distilled

asked by Tim's Titration Lab on April 4, 2008
21. ## English creative project

I have to make this half circle from a piece of white paper. It has to be circle shaped like a beach ball but made out of paper and only half of a circle. Does anyone know how to make this with a piece of paper? Could someone tell me a video too Thanks

asked by Amy~ on June 5, 2010
22. ## math

a carpenter has a piece of lumber measuring 9 feet 6 and 3/4 inches long how much the carpenter saw off to be left with a piece 7 feet 11 and 5/16 inches long?

asked by jashira on November 14, 2008
23. ## geometry

Jake needs 9 pieces of rope that are each the same length. He cuts the pieces from a rope that is 8 yards long and uses up the whole piece of rope. How long is each piece of rope?

asked by Anonymous on November 6, 2014
24. ## English

Can you please check these sentences I'm doubtful about? Thank you very much. 1) My parents like my clothing style because they think that wearing practical clothes is the most important thing/most important is to wear practical clothes/ 2) I was given

asked by Frank on December 20, 2013
25. ## Math

Eric has a straight garden path which is 2' x 15'. He wants to cover it with tiles that are each 1' x 2'.How many ways can he do this?

asked by Claire on December 9, 2010
26. ## math

if a room is 14ft by 12ft how many 1sq. ft. tiles do I need to cover my floor?

asked by gianna on April 29, 2015
27. ## Physics

A car travels at a speed of 70km/h. What distance will it cover in 30 minutes

asked by Anonymous on June 18, 2017
28. ## Consumer Math

Compute the square footage of carpet needed to cover a room 12' 3" x 18' 4".

asked by Will on January 11, 2013
29. ## Math

If a car travels 180km in 4hrs how much time will it take to cover 400km

asked by Mohammed Zayed Ali on November 23, 2016
30. ## Physics

A car travels at a speed of 70km/h. What distance will it cover in 30 minutes

asked by swayamdeep sahoo on June 18, 2017
31. ## MATH

how many one-inch square tiles will he need to cover a surface that is 2ft by 3ft

asked by ALI on February 24, 2011
32. ## math

the kitchen is 12 ft wide and 14 ft long how many six inch tile will I need to cover the floor

asked by mike on July 11, 2016
33. ## maths

if the diameter of a bullock cart is 1.4 how much rotation it will take to cover the distance off 1.1km

asked by zainab on December 1, 2017
34. ## Chemistry

What happens when NaOH has been sitting for a couple of days without cover before starting the titration?

asked by Melanie on March 29, 2011
35. ## English

1. Mr. Perez said we had to find a way to cover both topics. 1. Is we a subject pronoun in this sentence? Yes

asked by Hayden on September 29, 2015
36. ## College Math

Evaluate the expression. (8 7) however the () should cover both numbers. Please explain answer if poss.

asked by Jessica on August 25, 2012
37. ## english

My son has to make a cover page for his book report. What all needs to be on this sheet?

asked by shanen on May 8, 2008
38. ## Eng. Quick ?

At the bottom of your cover letter do you have to put resume enclosed or attached or no?

asked by Molly on March 25, 2009
39. ## hca210

, can you think of more efficient ways to cover the costs of long-term care

asked by luz on January 13, 2010
40. ## math

if a room is 12ft by 14ft how many square tiles do I need to cover the floor?

asked by gianna on April 29, 2015
41. ## mathes

A room is 8m×6m.how many tiles of 8cm×10cm are required to cover the floor?

asked by Anonymous on July 19, 2016
42. ## math

if a room measures 12 by 15 feet how many l square ft. tiles would I need to cover the floor.

asked by gianna on April 29, 2015
43. ## English Quick ?

When your writing a cover letter to a women of a company you address her as Ms. right not Mrs?

asked by Molly on March 25, 2009
44. ## College Chemistry

The sun bombards the earth with about 1KJ m^-2s^-1. Calculate the maximum mass of pure ethanol that can be vaporized in 10 min from a beaker left in strong sunshine, assuming the surface area of the ethanol t be 50cm^2.

asked by James on August 15, 2012
45. ## Chemistry

You are given a solution of HCOOH (formic acid) with an approximate concentration of 0.20 M and you will titrate with a 0.1105 M NaOH. If you add 20.00 mL of HCCOOH to the beaker before titrating, approximately what volume of NaOH will be required to reach

asked by Amber on November 11, 2015
46. ## MATH

WRITE THE GREATEST POSSIBLE ERROR FOR EACH MEASUREMENT. 43mL I don't understand the question It depends on the graduations. I assume on this beaker you have 40ml, 50 ml marks. So the 3 is an estimated digit. A safe assumption is +-.5ml error.

asked by SANDRA on April 29, 2007
47. ## physics

A heavy piece of equipment(85kg) is being moved by elevator between floors in a building. Two identical small cranes are used. A cable connecting each crane to a mounting hook on the top of the piece of equipment.The cable from one crane is at an angle of

asked by Emily on September 5, 2012
48. ## Chemistry

A piece of metal alloy (a solution of metals) is made of gold and silver. It is 20% by mass silver. An irregularly shaped piece of this alloy contains 0.356 lb of gold. When the alloy is added to a graduated cylinder that contains 31.55 mL of alcohol, the

asked by Mom on October 9, 2011
49. ## Chemistry

A student dried a wet crucible with a kimwipe. A piece of kimwipe was left clinging to the inside wall of the crucible. The student did not see the piece of kimwipe when adding the NaHCO3-KCl mixture to the crucible. The crucible and its contents were

asked by Avi on September 26, 2012
50. ## Physics

In an experiment done by scattering 5.5 MeV α particles on a thin gold foil, students find that 10,000 α particles are scattered at an angle greater than 90 degrees. How many α particles will be scattered between 60 degrees and 80 degrees?

asked by Sarah on September 30, 2014
51. ## Algebra

Megan factored the expression -12x^2 +52x-35as (-2x+5)(6x-7). But when Jacob applied the FOIL principle and multiplied out (-2x+5)(6x-7), he got -12x^2+44x-35; thus, Meganâ€™s solution does not appear to check. Why is that? Please help Megan to

asked by traci on June 29, 2011

robert has a piece of twine 3/4 yards long. he needs a piece of twine that is 2/3 of this length. how long of a piee of twine does robert need?

asked by natalie on August 17, 2010
53. ## Language Arts

9. Read the following sentence: Brian, would you please take that binder to Mrs. Smith with the red cover? What is the best way to correct the misplaced modifier in the above sentence? (1 point) a. Brian, would you please take that binder with the red

asked by marie on September 26, 2013
54. ## Physics

I have a few physics questions that I don't understand. Two are thermal expansion problems and the other is an ideal gas law problem. 1. Two rods, one made of iron and the other of aluminum, have the same initial length at 64.00 deg. C? When the

asked by Alyssa on February 8, 2016
55. ## 8th Grade US History

How is manifest destiny important to our past and future? How is it important? I don't really get what manifest destiny is... all we did in class is read O'Sullivans document called Manifest Destiny

asked by INeedHelp on September 24, 2014
56. ## classroom instruction

Teachers do need to establish ground rules about discussion: students should learn to listen politely to each other, and to agree to differ on occasion. Teachers can model calm and polite behavior, without giving in to irrationality. It is important to

asked by scooby on March 10, 2010
57. ## World History

These documents(Declartion of the rights of man and the citizen, English bill of rights, Marna carta , declaration of independence) established a system in which: a.The power of a leader came straight from God b. The individual was more important than the

asked by Boberto on February 27, 2016
58. ## chem (boyles and charles law)

A 1.00L balloon is filled with helium at 1.20 atm.If the balloon is sqeezed into a 0.500L beaker and doesnt burst ,what is the pressure of the helium?

asked by ty on April 28, 2013
59. ## chemistry

1-Barium sulfate and strontium sulfide both are placed into beaker of water. a- Will the strontium sulfide dissociate? ....... - If it does,write the equation showing the dissociation.

asked by Marie on May 5, 2012
60. ## Science

When we evaporate a salt solution salt crystals are left in the beaker or utensil but does the same thing happen in case of sugar solution?

asked by Diana on June 11, 2016
61. ## Chemistry

3. Is determining the excess reactant and limiting reactant an important part of a synthesis reaction? Is it an important part of a decomposition reaction? Explain.

asked by Morgan on January 25, 2015
62. ## History

choose four important influences on louisiana's contemporary culture and explain why each one is so important? I'm wondering if someone could explain or give an example to how I find what influences culture?

asked by Ugh! on May 2, 2016
63. ## AP Chemistry

Is determining the excess reactant and limiting reactant an important part of a synthesis reaction? Is it an important part of a decomposition reaction? Explain.

asked by Jessica AP Chemistry on July 5, 2016
64. ## chemistry

Calculate the percent error when a student measured a sample of aluminum and obtained a density of 2.5g/mL.

asked by Kyle Jackson on September 5, 2012
65. ## Stoichiometry Problem?

How many Milliters of 18.0M H2SO4 are required to react with 250mL of 2.50 M Al(OH)3 if the products are aluminum sulfate and water?

asked by Anonymous on March 29, 2009
66. ## chemistry

What is the maximum mass of H2 formed, when 0.380 g of aluminum are reacted with 55.0 mL of 8.00 M HCl? The other product is AlCl3

asked by joan on September 26, 2011
67. ## chemistry

i need help with a balanced equation for the displacement of aluminum in the soil and H+ ions from acid rain? (for leaching) thanks :)

asked by remi on November 8, 2008
68. ## chemistry

consider the electrolysis of molten AlCl3 what must the current be in amps if you need to obtain 25.0 grams of aluminum in 5.00 min

asked by Sanaa on April 20, 2010
69. ## chemistry

Calculate the percent error when a student measured a sample of aluminum and obtained a density of 2.5g/mL.

asked by jonas on September 5, 2012
70. ## chemistry

how much heat is required to raise the temperature of a 35 gm block of aluminum from 125 to 322 degrees?

asked by maryam on November 26, 2012
71. ## Chemistry

How many moles and how many grams of potassium alum, KAl(SO4)2 · 12 H2O, can be prepared from 5.00 g of aluminum?

asked by Cynthia on February 29, 2012
72. ## PHYsics 101

How much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22°C to 252°C unit of answer must be Joule

asked by Sammie on October 20, 2015
73. ## Chemistry

How many milliliters of 18 M H2SO4 are required to react with 250 mL of 2.5 M Al(OH)3 if the products are aluminum sulfate and water?

asked by Emma on April 25, 2011
74. ## chemistry

how many grams of copper can be heated from 21.5 c to 35.4 c by the heat energy released when 245 g of aluminum cools from 80.5 c to 49.8 c

asked by Kevbot on February 20, 2013
75. ## chemistry

What is the maximum mass of H2 formed, when 0.380 g of aluminum are reacted with 55.0 mL of 8.00 M HCl? The other product is AlCl3

asked by joan on September 21, 2011
76. ## physics

A aluminum wire has a diameter and uniform electric field of imposed along its entire length

asked by JAY Z on October 16, 2014
77. ## Chemistry

Does adding chromium and sulfuric acid together make a reaction? What about aluminum bromide and magnesium?

asked by Cierra on January 14, 2008
78. ## chem

what are the crystalline shapes of sucrose, sodium thiocyanate, and aluminum pottasium dulfate dodecahydrate??

asked by Amanda on January 11, 2008
79. ## Chemistry

the solubility of aluminum sulfate in water at 20 degrees celcius is 26.7 g/100mL Calculate the molarity?

asked by Gina on October 24, 2014
80. ## Chemistry

The Ksp of aluminum hydroxide is 5 x 10 -33.At what ph foes Al(OH)3 just begin to precipitate in a 0.15M solution of AlCl3?

asked by Beth on October 7, 2010
81. ## CHEM

asked by Jay on January 24, 2010
82. ## Chemistry

How much heat is required to raise the temperature of 25g of aluminum from 25.0 C to 100 C? Convert this value to joules?

asked by Santiago on April 11, 2017

what mass of copper may be produced when excess CuSO4 is reacted with 100g of aluminum metal?

asked by carson on February 23, 2009
84. ## Chemistry

the solubility of aluminum sulfate in water at 20 degrees celcius is 26.7 g/100mL Calculate the molarity?

asked by Gina on October 28, 2014
85. ## chem

How many mL of a 0.123 M aqueous solution of aluminum bromide, AlBr3, must be taken to obtain 7.77 grams of the salt?

asked by Danielle on November 18, 2014
86. ## chemistry

Using the balances eqution and assuming all other reagents are in excess, how many hydrogen would be produced when 1.00 g of aluminum react?

asked by Joanne on September 15, 2010
87. ## Chemistry

The solubility of aluminum sulfate in water at 20degrees Celcius is 26.7g/100L. Calculate its molarity?

asked by Gina on October 29, 2014
88. ## physics

how much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22 degrees C? unit of answer must be joule

asked by sammie on October 19, 2015
89. ## Chemistry

How many mL of 18 M H2SO4 are required to react with 250 mL of 2.50 M Al(OH)3 if the products are aluminum sulfate and water? How do i solve this?

asked by Anna on April 30, 2010
90. ## chemistry

need essay on,(a)Briefly describe the important similarity between light and matter revealed by Louis de Broglie's discovery of matter waves, and (b)list two important differences between light and matter waves.

91. ## chemistry

An aqueous solution of copper (II) sulfate is a thermodynamic system under study. What typer of system is this if the solution is contained in a beaker on a laboratory table?

asked by Grace Peterson on October 26, 2013
92. ## Physics

Work of 700 J is done by stirring an insulated beaker containing 110 g of water. (a) What is the change in the internal energy of the system? J (b) What is the change in the temperature of the water? °C

asked by Tiffany on March 30, 2012
93. ## To Mrs. Sue

a pyrite rock has density of 5.02 g/cm What will happen when the rock is placed in a beaker of mercury which has a denisty of 13.6 g/cm3? will it float or sink or neither but remain suspended? Is it sink?

asked by hunter on January 14, 2010
94. ## physics

how much heat is needed to melt a 50- gram 0 degrees celcius sample of ice that is placed in a glass beaker containing 200g of water at 20 degrees celcius?

asked by Jeanna on January 18, 2011
95. ## Physics

A spaceship of mass 2.0×106kg is cruising at a speed of 4.6×106m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 5.2×105kg , is blown straight backward with a speed of 2.2×106m/s . A second piece,

asked by Robbie on December 7, 2014
96. ## Analytical CHM

Rank the following items in order of accuracy: volumetric pipet, beaker,buret,erlenmeyer flask,volumetric flask

asked by Neda on September 3, 2014
97. ## Science

A large beaker contains 500ml of liquid mercury? The mass of mercury is 6773 g. What is the density? Do I divide 6773/500?

asked by Vonte' on October 23, 2011
98. ## chemistry

You have 26.44 mL of 1.83 M HCl in a beaker. You dilute this acid with 40.08 mL of water. When you analyze the solution you find that the number of moles of HCl in the new solution is

asked by Anonymous on December 5, 2011
99. ## math

A pipe is cut into twp pieces. One piece has a length of 33 inches. If the other piece has a lenght of u inches, what was the total lenght of the pipe, in inches, before cut?

asked by john on April 12, 2017
100. ## Art

What does this mean? I am suppose to find a piece of art that represents a human-centered view. but I don't know what human centered view means? can someone help me please so I can find a piece of art

asked by TJ on February 29, 2008