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

15,221 questions, page 24
1. ## physics

At a carnival, you can try to ring a bell by striking a target with a 11.6-kg hammer. In response, a 0.413-kg metal piece is sent upward toward the bell, which is 4.22 m above. Suppose that 26.2 percent of the hammer's kinetic energy is used to do the work

asked by justin on July 3, 2013
2. ## Physics

At a carnival, you can try to ring a bell by striking a target with a 8.46-kg hammer. In response, a 0.411-kg metal piece is sent upward toward the bell, which is 5.22 m above. Suppose that 34.4 percent of the hammer's kinetic energy is used to do the work

asked by Ben on August 27, 2015
3. ## Science

Explain in detail what causes tides and give one reason why it is important for humans to monitor tides? My answer: People need to watch the tides because they might be an mini tsunami! Who knows? It is highly important to watch it, especially in high

asked by Anything But Anonymous on November 29, 2018
4. ## Math

Good evening. I posted a math question earlier that I never received any help on because someone posted something inappropriate. My new math problem is as follows: The area of a rectangular piece of a land is 3/16 square miles. If the width of the piece of

asked by Donald on February 21, 2017
5. ## Science , physics

At the beginning of an invertigation , a student determines that the temp. of a beaker of water is 99.8+_ 0.1C . At the end of the investigation , the temp. Is 35.5+_ o.1C . What is the change in temp.?? My answer is 64.5+_ 0.2 C . Is this right ? Thank

asked by Maria on August 27, 2013
6. ## calculus

You have an 8.5 inch by 11 inch piece of paper. You need to cut out four squares in each corner of the box so you can fold the sides of the paper and create a volume for the box. 1. Write an equation that represents the volume of the box. 2. What is the

asked by John on October 10, 2008
7. ## Algebra

The length of a rectangular piece of steel in a bridge is 3 meters less than double the width. The perimeter of the piece of steel is 48 meters. Find the length of the steel. Find the width. What steps or formula do I use to solve this problem.

asked by Dee365 on March 13, 2016
8. ## Science ( chemistry )

how to make electrohemical cell with iron and aluminium foil? I should make that at home and at school teacher will give me acid or something to put metals in that. And i should know how to conect that with wires and make the bulb light - so i should

asked by angela on April 25, 2010
9. ## SCIENCE

how to make electrohemical cell with iron and aluminium foil? I should make that at home and at school teacher will give me acid or something to put metals in that. And i should know how to conect that with wires and make the bulb light - so i should

asked by ANGELA on April 26, 2010
10. ## math

ok i get the whole FOIL thing but what if there's negative numbers? and what do you if there's an addition and a subtraction? ex. (mn-m^2)(-n+m) you treat negative numbers just like positive numbers (for instance; (6x+3)(2x-2), 1st-6x*2x=12x^2, outer-

asked by heather on February 19, 2007
11. ## physcial science

Explain how the atoms of a piece of wood are tiny magnets, yet the piece of wood is not. The electron in atoms spin, and have magnetic moments. The electrons also have an orbital magnetic moment. However, when all the moments from the atoms are added up,

asked by jan on June 24, 2007
12. ## Chemistry PLS HELP

The cover plate is removed from the gas jars shown iin the diagram. Nitrogen dioxide is a brown gas. After several days, the color of the gas is the same in both of the jars. What explains this change? So the picture shows this jar and nitrogen and

asked by Cheezel on June 23, 2016
13. ## Calc

A 100 inch piece of wire is divided into 2 pieces and each piece is bent into a square. How should this be done in order of minimize the sum of the areas of the 2 squares? a) express the sum of the areas of the squares in terms of the lengths of x and y of

asked by katie on November 16, 2010
14. ## English

Please track the errors by editing this passage of writing. This is an exercise for my English homework. I have made a couple of changes or editing to the writing piece already, but I am not sure if there are more editing that needs to be made. Also,

asked by Sara on September 24, 2013
15. ## MGT

Supervisors are an essential component in improving the overall productivity and effectiveness of an organization—from planning and strategizing to cutting costs and controlling assets. Analyze and discuss the most important thing a supervisor can do to

asked by troyer0269 on November 30, 2008
16. ## bsa 375

Why is a systems development process needed? What is the objective of each phase of the SDLC? Describe briefly? How important are feasibility studies. The text mentions four types of feasibility studies: operational, technical, economic, and schedule. In

asked by darren on March 20, 2010
17. ## History

15.) Which change to the article would show bias in favor of one side of the gun-control debate It is important that we reach a compromise!" "Many Floridians think that the gun-control issue is important to address." "Most people know that limiting access

asked by YRN DJ on January 12, 2016
18. ## english to ms Sue

in the future, how will thing critically influence the ways that you: read,write, process information. Critical thinking and writing somehow are linked to each other. The most important part is to read and come up with an argument before making any

asked by Rose on April 1, 2008
19. ## epcc

How many moles of aluminum ions are present in 0.80 mole of Al2(SO4)3

asked by sylvia on October 24, 2015
20. ## Science

Were can i find a coloured diagram of a aluminum-nickel electrochemical cell?

asked by Claire on July 15, 2011
21. ## Physics

Why do some cooks put long aluminum nails through potatoes to be baked?

asked by Tweety on December 1, 2013
22. ## Chemistry

How many grams of aluminum sulfate are produced if 15.7 g Al reacts with excess CuSO4?

asked by karen on January 20, 2016
23. ## Chem

In the reaction that forms aluminum nitride from its elements, which element is being oxidized?

asked by Dan on November 15, 2015
24. ## Chemistry

If the percent yield was 81.5%, how many grams of aluminum were used to prepare 20.0 g of potassium alum?

asked by Cynthia on February 29, 2012
25. ## chemistry

how much heat is needed to bring 90.0 grams of aluminum from 25 to 75 degrees celcius?

asked by debbie on June 16, 2011
26. ## Physics

Would electrons be ejected from aluminum if the incident violet light has a wavelength of 4.00 x 10-7 m?

asked by Jackson on April 25, 2017
27. ## algebra

1 cm to the third of aluminum weighs 2.7 grams if a sheet is 0.003 8 find the weight

asked by joyce on September 27, 2014
28. ## chemistry

write a balanced equation for the reaction of aluminum with platinum and chloride.

asked by genny on September 30, 2010
29. ## Chemistry-Equation

How many moles of aluminum are needed to react completely with 2.4 mol of FeO?

asked by meg on March 5, 2010
30. ## asomaning

Aluminum has specific heat capacity of 900j/kg explain this statement?

asked by nanaldo on March 20, 2016
31. ## Chemistry

If 57j of heat are added to an aluminum can with a mass of 17.1g, what is its temperature change?

asked by Anonymous on January 26, 2011
32. ## College Chemistry

Given: 2Al2O3 (s) 4Al (s) + 3O2 (g) °H = 3351.4 kJ, what is °H for the formation of 12.50 g of aluminum oxide? Help please.

asked by Taylor Marie on March 20, 2010
33. ## Physics

A 40 kg sample of ALUMINUM is undergoing SUBLIMATION. How much does the temperature change during this process?

asked by Cameron on October 27, 2018
34. ## science

how could you use physical prperties to separate a mixture of iron and aluminum powder ?

asked by aya on April 20, 2009
35. ## physics

How much heat energy must be added to a 3.0 cm × 3.0 cm × 3.0 cm block of aluminum to raise its temperature from -50∘C to 50∘C?

asked by Anonymous on February 10, 2017
36. ## college

what will be the final temperature if a 5.00-g block of aluminum at 37.0 celsius gives off 25.0 J of heat to its surroundings?

asked by notsure on September 20, 2010
37. ## chemisrty

565 g block of aluminum metal is cooled from 243 c to 100 c is what?

asked by george on September 14, 2013
38. ## physics

How much heat does 25g aluminum give off as it cools from 95celsius to 30celsius?

asked by bits on September 28, 2016
39. ## Physics

Why do some cooks put long aluminum nails through potatoes to be baked?

asked by Anonymous on December 1, 2013
40. ## chemistry

How much hydrogen gas (H2) forms when 54 g of aluminum reacts with excess HCI ?

asked by Ed on April 16, 2011
41. ## pre-calc

Newline Recyclers processes used aluminum into food or dink containers. The recycling plant processes up to 1200 tons of aluminum per week. At least 300 tons must be produced for food containers, while at least 450 tons must be produced for drink

asked by court on February 17, 2009
42. ## math

Rachel cut a length of rope 4 1/3 meters into two pieces. The length of one piece of rope is 2 1/2 meters. What is the length of the second piece of rope. Please answer and explain.

asked by Anonymous on April 3, 2013
43. ## HCA 210

Describe at least two roles of medical staff and two roles of hospital administration that you consider most important. (Medical and Clin ical staffs, such as physicians and nurses, have roles and responsibilities different from those of hospital

asked by Jen on April 5, 2009
44. ## Math

Drew has a piece of wood that is 12 feet long . She cuts off 4 feet of wood and the remaining length is cut into 3 shorter pieces of equal length . What is the length of each shorter piece of wood ?

asked by Anonymous on November 13, 2018
45. ## physics

The illustration for this problem is at ds055uzetaobbcloudfrontnet/image_optimizer/142fdba0bc53bb9ae12ecea6de058f57fef01274.png A rope of length 90cm lies in a straight line on a frictionless table, except for a very small piece at one end which hangs down

asked by unowen on March 28, 2018
46. ## physics

The illustration for this problem is at ds055uzetaobbcloudfrontnet/image_optimizer/142fdba0bc53bb9ae12ecea6de058f57fef01274.png A rope of length 90cm lies in a straight line on a frictionless table, except for a very small piece at one end which hangs down

asked by unowen on March 30, 2018
47. ## Social Studies (Check, Please!) (Ms. Sue)

What was the Doolittle Raid and why was it so important? A: The Doolittle Raid was the first air raid on Japan in 1942, during World War II. Among several selected targets was the Japanese capital, Tokyo. This raid was so important because it provided an

asked by Victoria on January 5, 2016
48. ## physics

given the following apparatus; retort stand,stone,thread,spring balance,water,beaker and kerosine.using Archimede's principle, describe a simple experiment on how to determine the density of kerosine.

asked by kelechi on April 10, 2016
49. ## Chemistry lab

I mixed 10 mL of 9mM KI with 5 mL of 0.9mM in a flask, and then added it to a beaker that contained 10 mL of 45 mM KBrO3, and 10 mL of 90mM HCl. This reaction took 61.60 seconds to complete. I think I need to find the change in concentration, but don't

asked by Calley on April 8, 2014
50. ## algebra

Megan factored the expression 72x^2-43x+6 as (9x-3)(8x-2). But when Jacob applied the FOIL principle and multiplied out (9x-3)(8x-2), he got72x^2-42x+6; thus, Megan’s solution does not appear to check. Why is that? Please help Megan to understand this

asked by Elisa on June 19, 2011
51. ## Algebra

Megan factored the expression 72x^2-43x+6 as (9x-3)(8x-2). But when Jacob applied the FOIL principle and multiplied out (9x-3)(8x-2), he got72x^2-42x+6; thus, Megan’s solution does not appear to check. Why is that? Please help Megan to understand this

asked by Elisa on June 20, 2011
52. ## English

Here is the question What Is the Secret to Reaching Someone With Words? In this discussion, you will post issues related to connecting generations. To support your ideas, refer to the texts in this section, other texts you have read, and your personal

asked by Jay on May 26, 2018
53. ## Chemistry

A student places 100 mL of tap water in a beaker and uses both a thermometer and a temperature probe to measure temperature. The temperature of the water as measured by the thermometer is 27.7 C. The temperature of the water as measured by the temperature

asked by Drew on February 1, 2010
54. ## math

a carpenter was putting up a shelf. the shelf needed to be 87 centimeters long but the piece of wood she had was 1 meter and 28 centimeters long. her saw was 46 cm long. how much did she have to cut off the piece of wood?

asked by princess on November 28, 2011
55. ## Chemistry

In hydration of of 2-Ethyl-1-Butene What important bands (include wavenumbers) would begin to disappear in an IR spectrum and what important bands would begin to appear in the IR spectrum as the reaction progressed?

asked by Mandy on November 27, 2010
56. ## math,question

why are function notation important? I don't know that it is important. However, it is a convenient shorthand notation that speaks to the variables and the function rather plainly. what do you mean speaking to the variables can you give me an example of

asked by jasmine20 on January 14, 2007
57. ## English

Revise the following sentence to omit personal pronouns. I think it is important for you to evaluate information before it in a paper. It's important to evaluate information before including in your paper. Please check my work.

asked by Tim on February 4, 2017
58. ## Art

Hello, If you want to balance complementary colors so they'll appear static and harmonious it's important to use the proper proportions of each color. Is that correct? Thank You Yes it is important but If you use the proper proportion of complementary

asked by Mandi on August 15, 2007
59. ## algebra

. Victoria wants to plant a vegetable garden in the shape of a square. She has a space allocated in her backyard that will accommodate 175 square feet. Using the drawing below, use the FOIL method to find the polynomial that represents the area of the

asked by billy on March 9, 2014
60. ## a

Victoria wants to plant a vegetable garden in the shape of a square. She has a space allocated in her backyard that will accommodate 175 square feet. Using the drawing below, use the FOIL method to find the polynomial that represents the area of the

asked by WillyB on March 12, 2014
61. ## Cis/105

Besides budgeting - What are some uses for MS Excel we did not cover in class? Can you think of any other way you could use this application? Explain.

asked by Tonya on August 11, 2010
62. ## MATH

HOW MANY 1FT TILES ARE NEEDED TO COVER A 15FT BY 25 FT PATIO

asked by CLEO on January 27, 2011
63. ## Geometry

Which of the following best describes the front and back cover of a textbook when closed?

asked by Unknown on August 20, 2013

What are some authentic details of magazines? That would be price, captions, cover... What else?

asked by Sara on October 28, 2010
65. ## science

how many seconds will it take a speedboat traveling at 70 km/h to cover a distance of 5km?

asked by hello on February 19, 2013
66. ## physics

How long does it take the horse to cover the first 35.0 m of the race? acceleration is 3.00m/s^2

asked by bnh on September 8, 2015
67. ## History 8

What is the average amount of days of snow cover in New Hampshire?

asked by Alyonka on September 18, 2011
68. ## Science

What parts of the earth did glaciers cover during the ice age.

asked by Anonymous on November 16, 2016

For the highest accuracy, would you choose an aluminum or a steel tape rule for year-round outdoor use? a. steel tape rule b. either of the two c. aluminum tape rule Why? I am not quite sure what this question is asking. I took an educated guess of steel

asked by Mary on April 24, 2007
70. ## math (find height)

A piece of construction paper is .01mm thick. It is cut in half and one piece is placed on top of the other to make a pile. These are cut in half, and all four pieces are placed in a pile. These four are cut in half and placed in a pile, and the process is

asked by anonymous on September 22, 2007
71. ## English

I must combine the following sentences in the most effective way. Is my answer correct? Sentences: 1. He didn't cover his vehicle with the traditional camouflage. 2. He covered it with his own drawings. My answer(s) - Not sure which is the best way: He

asked by M on January 24, 2013
72. ## Math

Stan's Cans, Inc. expects to earn \$150,000 next year after taxes on sales of \$2,200,000. Stan's manufactures only one size of garbage can and is located in the small, but beautiful, town of Mount Dora, Florida. Stan sells his cans for \$8 a piece and they

asked by Jessie on March 6, 2012
73. ## Math Brain Teaser

This is a brain teaser and this is all the information you are given. I am sure that there is a simple answer, but I can't figure this out. There is no information about the weight of each steak. A man, buying steaks for his restaurant, approached a

asked by MomWhoIs50 on August 11, 2015
74. ## Calc.

Evaluate the indefinite integral. Please check my work? Not sure if I am doing this correctly. S= integral symbol S x^3*sqrt(x^2 + 1) dx u = x^2+1 x^2= u - 1 du = 2xdx du/2 = xdx 1/2 S x^2 * x sqrt (x^2 + 1) du 1/2 S (u - 1) * sqrt (u) du multiply square

asked by CMM on January 27, 2011
75. ## Chemistry

Some of your reaction mixture splashed out of the beaker when you dropped the tablets into the acetic acid. How would this affect your measurements? Woud your final calculated mass of sodium bicarbonate in the tablet be artificially high or low as a result

asked by John on February 16, 2013
76. ## chemistry

A strip of aluminium of mass 40.7g is dropped into a beaker of dilute hydrochloric acid. Calculate the work done (in J) on the surrounding atmosphere (1atm pressure, 26.1oC ) by the evolution of hydrogen in the subsequent reaction. State any assumptions

asked by sand on January 11, 2012
77. ## Physics

A potter’s wheel with rotational inertia 24 kg m2 is spinning freely with no friction at 50 rpm. A piece of clay is dropped from above the wheel and sticks 0.5 m from the center of the wheel. Afterward, the rotational speed of the wheel and clay has

asked by Anonymous on March 15, 2017
78. ## Chemistry

After adding a hot piece of titanium to a cup containing 300.0 mL of 30.0 °C water, the final temperature of the solution is 41.2 °C and the final volume of the solution is 400.0 mL. The density of titanium is 4.50 g/cm3. If no energy is lost to the

asked by Laura on December 11, 2014
79. ## Geometry

1. Why are points and lines hard to define? A point you can't move at all, a line you can only move back and forth in the same direction. Does drawing a point or a line accurately illustrate its characteristics? 2. What do we mean when we say a point

asked by Sue on October 6, 2015
80. ## science

asked by Anonymous on November 30, 2011

82. ## math

A sphere with a diameter of 13x8 centimeters is shown below. 104x118 Which of the following expressions best represents the volume of this sphere in cubic centimeters in terms of 7x5 ? A 45x24 B 45x24 C 44x14 D 44x14 2 These two boxes have the same volume.

asked by yee on February 4, 2019
83. ## Chemistry

Of the following metals, which ions are most easily reduced? aluminum*** iron mercury potassium

asked by Lara on May 25, 2016
84. ## Chemistry

stupid question making sure im right but whats Aluminum rounded to 3 sig figs

asked by Anonymous on November 5, 2018
85. ## HELP

Can a solution of CrCl3 be stored in an aluminum container? I did the math part- E= 2.45 (approx)

asked by scilover on May 9, 2013
86. ## chemistry

2. Aluminum chloride was a product in step 6. How could you instruct your lab partner to recover it.

asked by jhong on March 6, 2012
87. ## Chemistry

I am trying to find tests physial/chemical to distinguish an aluminum and iron mixture.

asked by Jim on February 1, 2008
88. ## college chem

How do i write the overall reaction equation for the synthesis of aluminum potassium sulphate dodecahydrate

asked by Anonymous on June 26, 2012
89. ## Physics

What happens to your tongue when you lick an aluminum ice cream scrapper just after it has been used? Does it stick to the scraper? Why?

asked by Tweety on December 1, 2013
90. ## Chemistry

How many moles of Carbon dioxide are produced from the decompostion of 1.45 grams of Aluminum Carbonate?

asked by Barb on February 24, 2008
91. ## Chemistry

How many kilograms of aluminum can be extracted from 2.0 metric tons of the ore 'alumina' (Al2O3)?

asked by Nathalie on January 13, 2008
92. ## Physics

What happens to your tongue when you lick an aluminum ice cream scrapper just after it has been used? Does it stick to the scraper? Why?

asked by Anonymous on December 1, 2013
93. ## tsu

what mass of aluminum must be used to produce 42.56 g of iron? fe2o3(s) + 2al(s) → 2fe(l) + al2o3(s)

asked by pppp on March 31, 2015
94. ## Science

What volume of hydrogen is produced when 70 grams of phosphoric acid react with aluminum

asked by dkdd on March 26, 2019
95. ## chemistry

2. Aluminum chloride was a product in step 6. How could you instruct your lab partner to recover it.

asked by Anonymous on March 3, 2012
96. ## Chemistry

What are washers, nuts, and bolts made of? Aluminum, Zinc, Iron, or Nickel?

asked by Alz on October 2, 2012

Consider the following substance: Al2(SO4)3 What is the oxidation number of: a) aluminum b) sulfur c)oxygen

asked by sam on January 31, 2012
98. ## Science

if an aluminum cube has a mass of 20g and the length of each side was 2 cm, between what two liquids would it float?

asked by Anonymous on September 27, 2012
99. ## Biology

Can you give me an order from 1 to 3 for the following materials, 1 being the best insulator and 3 being the poorest? styrofoam, plastic, aluminum

asked by Cara on November 12, 2012
100. ## electrochemistry

How do I determine the standard potential for an aluminum half cell? Can someone please explain to me how I do this? like what are the steps? thanks

asked by Kim on January 25, 2012