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

15,221 questions, page 21
1. ## Precalc

•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 right triangle with legs of equal length. The other piece will be bent into the shape of a circle. Let A represent the total area enclosed

asked by Bethany on October 27, 2015
2. ## math

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 right triangle with legs of equal length. The other piece will be bent into the shape of a circle. Let A represent the total area enclosed by

asked by Anonymous on October 22, 2018
3. ## geometry

Mr. Smith built a fence around a piece of land he wons. The piece of land is 30 yards long and 12 yards wide. How may feet of fencing did Mr. Smith use to build the fence?

asked by Adam on March 5, 2012
4. ## math

from a square piece of cardboard with length and width of x inches, a square of width x-1 inches is removed from the center. Write the area of the remaining piece of cardboard as a function of x

asked by Zach on February 13, 2013
5. ## Geometry

Joel is laying pipe for a sprinkler system before he plants his lawn.The lawn is a rectangle 15 feet long and 8 ft wide. He needs to lay a piece if pipe that will run diagonal along the lawn. It will divide the area of the lawn into two right triangles.

asked by Ashley on June 21, 2012
6. ## math

A box with no top is to be constructed from a piece of cardboard whose width measures x cm and whose length measures 6 cm more than its width. The box is to be formed by cutting squares that measure 2 cm on each side from the four corners, and then folding

asked by amanda on May 12, 2012
7. ## Precalc

You have a wire that is 100 cm long. You wish to cut it into two pieces. One piece will be bent into the shape of a right triangle with legs of equal length. The other piece will be bent into the shape of a circle. Let A represent the total area enclosed

asked by Cristiano on October 21, 2016
8. ## math

You are planning to spend no less than \$6,000 and no more than \$10,000 on your landscaping project. Write an inequality that demonstrates how much money you will be willing to spend on the project. Suppose you want to cover the backyard with decorative

asked by Anonymous on May 31, 2008
9. ## Chemistry

Hi! I'm having trouble solving this question, not sure how to go about starting it: Magnalium is a solid mixture of aluminum metal & magnesium metal. An irregular shaped chunk of a sample of magnalium is weighed twice, once in air (211.5g) and once in

asked by Mila on February 26, 2016
10. ## Physics

A spaceship of mass 2.1×10^6 kg is cruising at a speed of 5.0×10^6 m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 4.8×10^5 kg , is blown straight backward with a speed of 2.3×10^6 m/s . A second

asked by Joseph on November 11, 2015
11. ## College Algebra

A rectanguler piece of metal is 5 inches longer than it is wide. Square with sides 1 inches longer are cut from the four corners and the flaps are folded upward to form an open box. If the volume of the box is 644 inches, what are the original dimensions

asked by Meghan on January 19, 2016
12. ## Math

A piece of fabric is 52 inches long. You cut the fabric into two pieces. The first piece is x inches long. The second is 14 inches longer than the first. Draw a diagram & solve for x.

asked by Olivia on August 24, 2014
13. ## Chemistry

When titrating a weak base with a strong acid, what effect will washing the tip of the burette and sides of the beaker with distilled water have on the pKa and equivalence points?

asked by C on March 31, 2013
14. ## Chemistry

When titrating a weak base with a strong acid, what effect will washing the tip of the burette and sides of the beaker with distilled water have on the pKa and equivalence points?

asked by C on March 31, 2013
15. ## chemistry

Calculate the change in free energy when you drop 4.70 g of calcium metal into a beaker containing excess water so that Ca(OH)2(s) and H2 gas are formed? The delta-G values you need are in your textbook. The units are kJ.

asked by danny on February 7, 2015
16. ## science

density of gold is 19.32 g/cm^3.A piece of gold leaf is 2.50 cm on each side and 0.100 mm thick,How many atoms of gold are in this piece of gold leaf?

asked by Anonymous on April 4, 2016
17. ## Physics

A spaceship lifts off from the Earth with constant acceleration. 9 seconds into the flight, a small piece of the ship breaks off and falls back to the Earth. If the piece hit the ground 11.5 seconds after breaking off from the spaceship, what is the

asked by Kayla on January 29, 2012
18. ## physics

A copper plate has a hole cut in its center. When the plate is heated, the hole gets smaller. When heat is added to a system, the temperature must rise. When the pendulum of a grandfather clock is heated, the clock runs more slowly. Cold objects do not

asked by anonymous on April 16, 2012
19. ## Math

I have 100 bucks to buy 100 fruits. The fruits which I need to buy are- mango; which is 20 piece for 1 buck, lichi; which is 1 piece for 1 bucks and coconut; which is 1 piece for 5 bucks. How many each of those fruits do I have to buy to get this

asked by Amanda on February 5, 2017
20. ## Art

How has colantorio used visual composition to communicate the glory of war in Alexander the Great and His Conquest of Asia A colantorio shows exuberant soldiers celebrating their victory B. colantorio shows powerful Alexander slaying his enemy C.

asked by BUBBLES on February 16, 2015
21. ## chemistry

A beaker contains 50.0 mL pf 0.953 M solution of a diprotic acid. How many grams of Mg(OH)2 are required to neutralize this solution?

asked by Monica on June 12, 2010
22. ## GN National Public School

If one third of 100 gm of 27% of aqueous solution is taken in a beaker and 10 gm of sugar is added to it,the concentration of resulting solution is.....

asked by saumya on October 24, 2015
23. ## Chemistry

A beaker contains 50.0 mL of 0.952 M solution of a diprotic acid. How many grams of Mg(OH)2 are required to neutralize this solution?

asked by Monica on June 12, 2010
24. ## chemistry lab

Why do we have to weight the beaker with salt and water before dissolving the Nacl ? why is it incorrect to weight it after we dissolve it

asked by terenlo on June 14, 2016
25. ## pre-calc

"An open gift box is to be made from a square piece of material by cutting 2 centimeter squares from each corner and turning up the sides. The volume of the finished gift box is to be 200 cubic centimeters. Find the size of the original piece of material."

asked by kari on October 30, 2011
26. ## english - after revision

In order to find information for topics that interest me, I will go to the University library. When using different sources such as website, library and articles, it is very important to know that each source has an author and which one is the most

asked by rose - Ms. Sue on April 14, 2008
27. ## science

There are 150 grams of water in a beaker. If the water freezes,what is the massof the ice?

asked by elsie velasquez on March 12, 2011
28. ## science

you have 100 ml of water in a beaker.you add 20 ml of table salt.the water level rises to only 105 ml.

asked by Anonymous on November 18, 2018
29. ## 9th grade science

A strong acid, HBr, has been dissolved into a beaker of water. If the solution is known to be 0.000 001 M, what is the pH solution?

asked by Amy on March 11, 2011
30. ## Chemistry

If a silver wire is placed in a beaker containing 1 M Cu(NO3)2, what will happen? I don't think anything will happen, but what is the right way to explain this is chemical terms?

asked by Ryan on March 24, 2010
31. ## chemistry

A beaker contains 199 mL of NaOH with a concentration of .100 mol/L. Calculate the number of moles of NaOH

asked by Anonymous on June 27, 2011
32. ## Science

you have 100ml of water in a beaker. you add 20 ml of table salt. the water level rises to only 105 ml.

asked by Tee on September 19, 2012
33. ## Math

Question! If you put a bacteria in a beaker that doubles itself every minute at 11 and it's full at 12 at what time is it half full

asked by Sagar on February 2, 2017
34. ## Ochem Lab

why is it important to spot samples directly on the marks made on the TLC plate? This is for Thin Layer Chromotography. Is this important so that the solvents move directly up the plate and can be identifies easily? Thanks

asked by Adam on October 24, 2010
35. ## worldhistory

What were two important trade goods in west Africa during The Middle Kingdom Slaves were traded with European countries and with the Americas. Salt was an important trade item inside Africa.

asked by paris on November 30, 2006
36. ## Economics

Advertising is an important aspect of the business world. a. which business environment is it especially important and explain why? b. does advertising increase or decrease the cost and therefore the price of the product to the consumer? Provide one

asked by Jay on April 15, 2008
37. ## algebra

The length of a rectangular piece of steel in a bridge is 4 meters less than triple the width. The perimeter of the piece of steel in a bridge is 4 meters less than triple the width. The perimeter of the piece of steel is 48 meters. Find the length of the

asked by laurie on February 5, 2015
38. ## Health (Ms. Sue)

Describe why it is important for teens to separate feelings and behaviors. A: Separating feelings from behaviors is important because this action makes a teenager truly more mature and independent?

asked by Anonymous on December 7, 2013
39. ## chemistry

How would you find moles of aluminum used?

asked by MG on October 16, 2008
40. ## science

what is the charge on an aluminum ion?

asked by mic on October 18, 2010
41. ## Chemistry

Aluminum chloride as acid

asked by Anonymous on March 29, 2019
42. ## science

if aluminum has the density of 2.7g what would the mass be?

asked by Brandon on April 4, 2013
43. ## physics

A 500g trolly is placed on a runway that is tilted so that it makes an angle of 30 degrees to a horizontal table.A light inextensible string is attached to 150g mass piece.the trolly accelerates down the slope as a result of the force applied by the

asked by sinethemba on March 6, 2016
44. ## Englishj

1. But the most important thing is there are no more rats. 2. But the most important thing is that there are no more rats. 3. But the most important thing is, there are no more rats. ============== Which expressions are correct? Are they all grammatical?

asked by rfvv on May 16, 2015
45. ## Poverty

Why is important to fight against poverty? these people in poverty are characterized by others as being worthless, are rejected, and are made to feel guilty because of their situation. It's important to help these people because their lives have been torn

asked by Sarah on November 18, 2010
46. ## Biochemistry

1. Describe the ran world hypothesis 2. A) list the types of non covalent interactions that are important in providing stability to the three dimensional structures of macromolecules. (B) why is it important that these interactions be noncovalent , rather

asked by Viv on September 18, 2015
47. ## chemistry

Two 50mL beaker. One contains 50mL of 1.0M PbSO4 and the other contains 10mL of 0.1M Pb(NO3)2 added with 40mL of .10M KI. What is the Ksp of PbI2?

asked by slamj on October 24, 2013
48. ## Physics

A 500-mL beaker has a mass of 250 g when empty and 645 g when filled with an unknown liquid. What is the density of the liquid?

asked by Lance on May 2, 2018
49. ## Clinical chemistry

Describe how you can prepare 0.25 molar solution of sodium hydroxide from an 80 percent stock solution in a 500mls beaker

asked by Lowicy on November 9, 2014
50. ## Chemistry

Determine the density (in g/mL) of a liquid given: A beaker was weighed at 90. g, then 413.5mL of liquid was added and the new weight was 795 g.

asked by Oscar on March 6, 2011
51. ## chemistry

Two 50mL beaker. One contains 50mL of 1.0M PbSO4 and the other contains 10mL of 0.1M Pb(NO3)2 added with 40mL of .10M KI. What is the Ksp of PbI2?

asked by denny on October 24, 2013
52. ## Physics

Work of 730 J is done by stirring an insulated beaker containing 80 g of water. What is the change in the temperature of the water? Please show calculation

asked by BOB on October 19, 2011
53. ## Chemistry

when heating a beaker, where should the burner flame be located for maximum heating?

asked by Anonymous on June 16, 2008
54. ## geometry

I am confuse as to how to actually work these problems. Please help!!! 1. You are planning to spend no less than \$6,000 and no more than \$10,000 on your landscaping project. a) Write an inequality that demonstrates how much money you will be willing to

asked by Anonymous on May 31, 2008
55. ## human resources

Discuss the pay and compensation you receive at your most recent place of employment and what aspects of compensation are most important to you? How important is direct pay and bonuses?

asked by kim on January 28, 2013
56. ## Math

A square piece of cloth is folded in half to form a rectangle. If the resulting rectangle has a perimeter of 8 inches, what are the area and perimeter of the square piece of cloth?

asked by Tiffany on January 7, 2009
57. ## math

in order for piece of rectangular luggage to fit in the overhead compartment of a certain airplane, the sum of the height of the luggage and the perimeter of the base of the luggage must be less than or equal to 110 inches. If a piece of luggage has a

asked by Julia Ten on July 29, 2009
58. ## Math

You have a wire that is 35 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 ME on August 8, 2010
59. ## math

lynda cut 3.2 meters of ribbon into equal size pieces. each piece was longer than 0.1 meter, but shorter than 2.o meters, with lengths in increments of 0.02 meters. How many pieces did lynda cut,and how long was each piece?

asked by Mashiya on November 27, 2012
60. ## math 5th grade

Lynda cut 3.2 meters of ribbon into equal-size pieces. Each piece was longer than .01 meter, but shorter than .02 meters, with lengths in increments of .02 meters. How many pieces did Lynda cut and how long was each piece?

asked by Patrick on December 12, 2012
61. ## math

Gail and 3 friends all share 1/2 a pie. All the pieces in pie put together make up 180 degrees. Gail and friends finish the pie and each eat an equal piece. They believe each piece has an angle of 25 degrees. Are they right?

asked by ellen on January 7, 2014
62. ## English

For each item on the list of writing techniques below, choose the selection from Unit 3 that best utilizes it. Describe how it is used and the effect of its use in the story, and give reasons why you chose it. Options: The Lottery The Cask of Amontillado

asked by Clique Member |-/ on May 30, 2017
63. ## Art

The Art of War 1) How has Colantonio used visual composition to communicate the glory of war in Alexander the Great and His Conquest of Asia? :Colantonio shows exuberant soldiers celerbrating their victory. :Colantonio shows powerful Alexander slaying his

asked by TheLOUDEST_0430 on March 2, 2015
64. ## English

1. It was missing a piece. (It refers to 'the circle' One piece was felling from the circle. In this situation, what is the meaning of Sentence 1? Was the piece in the process of falling away from the circle?) 2. You should not make a fire in the

asked by John on June 13, 2009

1. Why was it important for Lincoln to wait to issue the Emancipation Proclamation It could have caused revolts in the north It was important to have popular support beforehand It could have ended the rebellion before Union victory It may have caused

asked by Not my name on March 2, 2017
66. ## English

Choose the correct sentence. A. The conference spokesperson delivered his speech wearing a three-piece suit. B. Wearing a three-piece suit, the speech was delivered by the conference spokesperson. C. Wearing a three-piece suit, the conference spokesperson

asked by Angela on June 24, 2014
67. ## english

Choose the correct sentence. A. The conference spokesperson delivered his speech wearing a three-piece suit. B. Wearing a three-piece suit, the speech was delivered by the conference spokesperson. C. Wearing a three-piece suit, the conference spokesperson

asked by Angela on June 24, 2014
68. ## English - Miss Sue

Choose the correct sentence. A. The conference spokesperson delivered his speech wearing a three-piece suit. B. Wearing a three-piece suit, the speech was delivered by the conference spokesperson. C. Wearing a three-piece suit, the conference spokesperson

asked by Angela on June 24, 2014
69. ## help me improve my sentence

It is interesting to see how these three Internet sources all cover the same story, but with different methods and techniques to persuade the reader to believe the media’s perspective of things. how can i say this in a different way. It is interesting to

asked by david on January 28, 2007
70. ## Art

1) what is te message of the monument? 2) why was a particular location chosen for its display? 3) Do you ageee with the chosen location for display? 4) Do you feel that the best way to communicate the message of the piece? 5) Given the tragedy That

asked by Jennie on November 13, 2018
71. ## math

Suppose you want to cover the backyard with decorative rock and plant some trees as the first phase of the project. You need 30 tons of rock to cover the area. If each ton cost \$60 and each tree is \$84, what is the maximum number of trees you can buy with

asked by heather on July 30, 2007
72. ## Chemistry

Does the solid Zn(OH)2 dissolve when concentrated lye, NaOH solution, is added to a beaker containing a saturated solution of Zn (OH)2 and a small amount of Zn(OH)2?

asked by Ron on May 5, 2010
73. ## Chemistry

So I mixed 25 mL of 0.002 M KSCN and 25 mL of water in a beaker. The solution was clear with no precipitants. But then it says the ions present in KSCN are: so i put K+,S2- , CN- is that right?

asked by Ana on November 28, 2010
74. ## Biology

what will the final temperature be of a beaker of water weighing 100g if its initial temperature is 21 ° and is heated using 125 joules in energy?

asked by cake on January 23, 2015
75. ## Chemistry

The thermite reaction, used to weld rails together in the building of railroads, is described by the following equation. Fe2O3(s) + 2Al(s) --> Al2O3(s) + 2Fe(l) Calculate the mass of iron metal that can be prepared from 150 grams of aluminum and 250 grams

asked by Anonymous on November 3, 2015
76. ## Science/Physics

Which Is A True StateMent? When comparing the force that is required to climb a mountain by walking up a trail that slopes gently upward to the top, versus getting there by scaling asheer vertical cliff face, """"I believe it would be D"""" a. You use more

asked by Jenny on March 4, 2009

a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for warm water is 100L/day,

asked by Anonymous on October 26, 2013
78. ## Math

A piece of wire 9 m long is cut into two pieces. One piece is bent into the shape of a circle of radius r and the other is bent into a square of side s. How should the wire be cut so that the total area enclosed is: I need help finding the radius and side

asked by Anonymous on April 11, 2016
79. ## math

Peter wants to wear a 3 piece outfit .In the wardrobe he has a white shirt and a blue shirt,a pair of brown trousers,a pair of black trousers and some blue jeans.He has a cashmere coat and a windcheater.How many different 3 piece outfits can he wear? Is it

asked by karen on February 11, 2013
80. ## French I

We're just learning how to use adjectives and I am a little confused. "A blue piece of paper" I know a piece of paper is "une feuille de papier". And blue is "bleu" Since feuille is feminine you would say bleue but papier is masculine. Where does the bleue

asked by Jessie on June 8, 2008
81. ## physics

A steel rod of length 4 m is welded to the end of an aluminum rod of length 3 m (lengths measured at 23 °C). The combination rod is then heated to 198 °C. What is the length of the combination rod at 198 °C? (The linear expansion coefficients for steel

asked by sima on April 4, 2012
82. ## Physics

You have a brass ring of inside diameter 10.00 cm that is at 20.0oC. You want to slip this ring over an aluminum rod that is at 20.0oC and has a diameter of 10.01 cm. a. To what temperature do you have to heat the ring to slip it over the rod? b. Once you

asked by David on December 4, 2014
83. ## Physics - Center of Mass

A square aluminum plate (volume mass ρ = 2700 kg/m^3) has dimension L = 4.8 m and e = 0.9 m. A cylinder of radius R = 1.5 m and at a distance d = 1.2 m from the center of the plate and at 20 deg with the horizontal, is removed from the plate. Find the

asked by Kid on August 24, 2017
84. ## Physics

A 5.0 kg shell is fired vertically upward. At its max height of 350.0 m, it explodes into 3 pieces. A 1.0 kg chunk lands 15.0 m away, 45 O due northeast from the launch site. A second 1.0 kg piece lands 25.0 m, 60 O south of east from the launch site. If

asked by Chad on August 7, 2012
85. ## social studies!!!

I left my textbook in my locker...again. sorry If u can find me a website to help me...great...if u can answer them...even better!! 1. Would shipping be easier to block in the gibralter or bosporus strait? Why? 2.what countries rely on the strait of hormuz

asked by leslie on March 4, 2013
86. ## Math

The length of a rectangular board is 10 centimeters longer than its width. The width of the board is 26 centimeters. The board is cut into 9 equal pieces. a. What is the area of each piece? b. What are the possible dimensions of each piece? (Take the

asked by Anonymous on September 8, 2015
87. ## math

A pipe is 42 inches long. It is to be cut into three pieces such that the longest is four times as long as the shortest and the middle-size piece is six inches longer than the shortest. How long is the middle-sized piece?

asked by Anonymous on September 7, 2012
88. ## chemistry

How many kilocalories are required to produce 12.7g of aluminum?

asked by dakota on March 9, 2015
89. ## chemistry

how many atoms are in 0.320 moles of aluminum?

asked by samantha on April 5, 2011
90. ## chemistry

how many grams of aluminum are in 25.0 ml of a 14%(w/v) solution of Al2O3?

asked by unk on April 25, 2011
91. ## Chemistry

How many aluminum atoms are there in 15.0mg of Al2O3?

asked by Les on December 12, 2016
92. ## SCIENCE

is aluminum MIXED with or COMBINED with other elements?

asked by Happy Face on February 28, 2010
93. ## chemistry

kc expression for aluminum+hydrochloric acid

asked by fareeha on August 14, 2014
94. ## Chemistry

Aluminum sulfate and calcium acetate = ?

asked by Alexis on March 29, 2012
95. ## science

is aluminum MIXED with or COMBINED with other elements?

asked by Happy Face on February 28, 2010
96. ## AP chemistry

what is the balanced equation of Aluminum + Koh

asked by Lilly on October 15, 2009
97. ## Chemistry

What is the percent of aluminum in Al2(SO4)3? A. 15.8% B. 28.1% C. 56.7% D. 54.0% C?

asked by quick help please on June 9, 2016
98. ## mathe

Please respond with a number to the question: I have a pie. If I give two pieces to Joe, one piece to Mary, and another piece to Joe, how many pieces of pie does Joe have?

asked by waldhans on January 28, 2017
99. ## science

a piece of wood that measures 3.0 cm by 4.0 cm by 5.0 cm has a mass of 90.og. what is the density of the wood? would the piece of wood float in water? remember the density of water is 1.00g/ml

asked by dylan on June 21, 2011
100. ## ALGEBRA 1

kendra owns a restaurant. she charges \$3.00 for 2 eggs and 1 toast, and \$1.80 for one egg and one piece of toast. how much does kendra charge for an egg? a piece of toast?

asked by loraine on May 14, 2012