Friday

January 20, 2017
Total # Posts: 891

**chem**

Anhydrous aluminum oxide can be reduced to aluminum according to thisa chemical equation: 2 Al2O3 (s) ---> 4 Al (l) + 3 O2 (g) Calculate the mass of aluminum oxide reacted if 91.4 g of Al was produced and the percent yield was found to be 89.3%

*September 15, 2010*

**science**

sodium is attracts magnets

*September 14, 2010*

**MATH**

Given the GCF or LCM, what else do you know about each pair of numbers? a) Two numbers have GCF of 2. b) Two numbers have an LCM of 2. Please and thankyou!

*September 13, 2010*

**chem**

yes ion.

*September 5, 2010*

**chem**

How many electrons are in an atom of O2-.

*September 5, 2010*

**12th grade maths**

Alicia needs $2000 three years from now. How much should she deposit at the end of each year for the next 3 years in an account that pays 5% compounded annually?

*August 20, 2010*

**chemistry**

a. NaBr - nearly neutral b. K2SO3 - basic c. NH4NO2 - acidic d. Cr(NO3)3 - acidic

*July 4, 2010*

**math**

Car A is moving 48 km/h

*July 2, 2010*

**math**

oh okay... thank you very much!

*July 2, 2010*

**math**

can you please tell me how you got the answer? :)

*July 2, 2010*

**math**

Car B is 48km ahead of Car A. If Car Bis not moving and Car A is moving at 48km/h, how long will it take Car A to reach Car B?

*July 2, 2010*

**math**

Can you bisect a acute angle, right angle, or obtuse angle using each method: paper folding, a transparent mirror, and a compass and ruler? why or why not?

*May 18, 2010*

**CHEMISTRY**

2NO(g) + O2(g) --> 2NO2(g) Derive the theoretical rate law and indicate whether or not this is a possible mechanism for the above reaction: (1) 2NO(g) <-->* N2O2(g) (fast) (2) N2O2(g) + O2(g) --> 2NO2(g) (slow) Extra Info: This reaction is third order overall. NO ...

*April 25, 2010*

**Chemistry**

2NO(g) + O2(g) --> 2NO2(g) Derive the theoretical rate law and indicate whether or not this is a possible mechanism for the above reaction: (1) 2NO(g) <-->* N2O2(g) (fast) (2) N2O2(g) + O2(g) --> 2NO2(g) (slow) * indicates equilibrium arrows Thank you!

*April 24, 2010*

**CHEMISTRY**

thank you so much! no, I've been doing many questions on half cells and cell potential and I mindlessly forgot to assign oxidation numbers, just going by the sign of the element as you would with half cell questions. you're awesome help! thanks!

*April 22, 2010*

**CHEMISTRY**

Hello, I am trying to balance this redox reaction WITHOUT using the half-reaction method. Here is the unbalanced equation: MnO4 -(aq) + Zn(s)--> Mn 2+(aq) + Zn 2+(aq) It looks as if both elements are being oxidized. The answer is supposed to be: 2MnO4 -(aq) + 16H +(aq) + ...

*April 22, 2010*

**math**

calculate the surface area of each prism. length 9cm width 4cm hieght 8cm

*April 21, 2010*

**math**

how do you find the surface area and volume?

*April 21, 2010*

**CHEMISTRY**

Hello, I am having trouble balancing this redox reaction WITHOUT using the half-reaction method. I believe this is because not all of the elements are in (aq). BrO3-(aq) + N2H4(g) --> Br-(aq) + N2(g) Br is reduced by a factor of 6. N is oxidized by a factor of 2. I will ...

*April 21, 2010*

**math**

The capacity of a 1cm cube is 1mL. How many 1cm ice cubes would you need ti melt to fill a 1.5L jar?

*April 20, 2010*

**chemistry**

why are the flair lights at the air port yellow/orange instead of white? my teacher gave me until monday 18th to answer this and i think he expects a scientific answer but i have nothing

*April 17, 2010*

**earth**

If the distance from the moon to the Earth increased from 230,000 (which it is today) to 2,000,000 miles, what affect would this have on the tides?

*April 12, 2010*

**Physics**

A spherical steel ball has a diameter of 2.540cm at 25 degree Celsius. (a)What is its diameter when the temperature is raised to 100 degree Celsius? (b)What temperature change is required to increase its volume by 1%?

*April 8, 2010*

**Physics**

A spherical steel ball has a diameter of 2.540cm at 25 degree Celsius. (a)What is its diameter when the temperature is raised to 100 degree Celsius? (b)What temperature change is required to increase its volume by 1%?

*April 8, 2010*

**education**

Thanks

*April 6, 2010*

**education**

Children will generally select equipment based on: a.their prior success with the equipment. B.the size of the equipment c.the brightness and boldness of the equipment's colors d. The opportunity for challenge presented by the equipment. My answer is D. Could someone ...

*April 6, 2010*

**Physics**

Well it's an kinematics project and it involves alot of questions. So here goes the problem: Suppose a football was thrown at an angle of 37 degrees with a velocity of 90mi/hr while leaving a quarterback hand at a height of 6'4" above the ground. A)Calculate the ...

*April 6, 2010*

**education**

Someone please check this for me

*March 29, 2010*

**education**

1.For motor development,the greatest importance for the developing infant is. A.tummy time b.sitting c.crawling d.walking my answer is crawling 2. At what stage does the ability to use imagination begin to develop? A.infancy b.toddlerhood c.preschool d.early elementary my ...

*March 29, 2010*

**education**

Someone please check me answer

*March 25, 2010*

**education**

I think it is b.verbal\linguistic

*March 25, 2010*

**education**

Cooperative activities enhance which intelligence? A.logical\mathematical b.verbal\linguistic c.intrapersonal d.interpersoal

*March 25, 2010*

**Chemistry**

Wilh this form a buffer? 50 mL of .10 M HCl; 35 mL of .150 M NaOH WORK: Moles of HCl= .005 Moles of NaOH= .00525 total litres of solution= .05 + .035= .085 L [HCl]= .005 mol/.085 L = .0588 M [NaOH]= .00525 mol/ .085 L = .0618 M Ka of HCl= 1.3*10^6 pKa= -log(1.3*10^6) = -6.114 ...

*March 22, 2010*

**chemistry**

Will this solution form a buffer? 100 mL of .10 M NH3; 100 mL of .15 M NH4Cl Work: NH3= .01 moles NH4Cl= .015 moles .... not sure what else to do. I think we use the H-H equation, but I don't know how to find pKa, or even what pKa is. This should give the pH of the ...

*March 19, 2010*

**pre algebra**

r=2

*March 18, 2010*

**French**

Can you please check these Choose A. Le caissier m'a donné 200 euros en liquide. B. Je suis toujours fauché. C. Le caissier m'a donné 10 billets de dix. D. J'aime mettre de l'argent de côté. 1. -------- J'ai touché ...

*March 15, 2010*

**education**

Transition planning for children with special needs should focus primarily on: a.maintaining continuity of services b.getting the child ready for school c.the family's needs d.the child's needs

*March 8, 2010*

**education**

A major goal of a child's transition to a new program is to: a.meet new people b.learn new skills c.meet new teachers d.transfer skills

*March 8, 2010*

**education**

1.Transition planning for children with special needs should focus primarily on: a.maintaining continuity of services b.getting the child ready for school c.the family's needs d.the child's needs. My answer is d.the child's needs. Will someone please check my answer

*March 8, 2010*

**early childhood education**

A.a bad personality

*March 8, 2010*

**early childhood education**

1.A child's noncompliance is often due to all of the following EXCEPT: a.too many rules b.not enough choices c.poor ability to understand d.a bad personality

*March 8, 2010*

**college**

B."Walk in the hallway"

*March 8, 2010*

**college**

1.You want children to walk in the hallway.If they begin to run,the best thing to say to redirect them is:a."Stop running" b."Walk in the hallway" c."Running is for outside" d."We don't run"

*March 8, 2010*

**Computer Data Analysis**

How to apply the concepts of readability,reusability,and reliability in the use of spreadsheets.Do you think these really matter in the workplace? How about charting?

*March 6, 2010*

**math**

suppose you are starting an office-clening service. You have spent $315 on equipment.To clean an office, you use $4 worth of supplies.Yoou charge $25 per office. How many offices must you clean to break even?

*February 24, 2010*

**Computers**

Hi, I have an IT programming question but I'm not sure what the question means exactly. Question: Make an immutable class to represent DNA and RNA, these classes must wrap around a mutable character array the contents of which is used to set the state of these objects ...

*February 18, 2010*

**Computers**

Hi, does anyone know the difference between "public int getId()" and "public static int getId()" and when would you use them? thanks

*February 8, 2010*

**math**

40 is the answer. You are right :)

*February 8, 2010*

**Math**

4% of 1058.3 = B)

*January 31, 2010*

**Algebra**

Thanks Damon and Reiny, it helped a lot. Really appreciate it :)

*January 31, 2010*

**Algebra**

Hi, I'm struggling to do two questions. 1) If ||u||=2, ||v||=root 3 and u dot v = 1, find ||u+v|| 2)Show that there are no vectors u and v such that ||u|| = 1, ||v||=2 and u dot v = 3 Please help if you can. Thanks a million

*January 31, 2010*

**algebra**

b would be the y-int. Therefore b = 3 then sub the pt (-16,0) into the equation and solve for m.

*January 31, 2010*

**algebra**

- x = 1 11 26

*January 26, 2010*

**french**

Pouvez-vous me tansformer le mot gratÃ©sinoge en un vrai mot franÃ§ais?

*January 25, 2010*

**français**

Qu'est-ce que gratÃ©sinogÃ©?

*January 25, 2010*

**math**

what are the odds of drawing a spade and a heart out of a regular deck of playing cards?

*January 23, 2010*

**math**

N/3 + 6 = 10

*January 23, 2010*

**your own opnion**

do you think chocolate is pure? why or why not?

*January 18, 2010*

**a matter of opinion**

do you think chocolate is pure? why or why not?

*January 18, 2010*

**graphs**

the number in the data file are 71,56,62,77,38 what scale would you use to graph the data

*January 13, 2010*

**simple equations ( math)**

Divide 300 cards between Ann and Elizabeth so that Ann has 5 times as many as Elizebeth's cards

*January 10, 2010*

**simple equations ( math)**

Oh. ook ... thank you for your help

*January 10, 2010*

**simple equations ( math)**

ohyes sorry i meant that. 3/4 of 100 is 75 so the rest is 25

*January 10, 2010*

**simple equations ( math)**

so altogether the have $100. Joseph has 3 time more then Peter. would joseph have $75 and Peter have $15 ?

*January 10, 2010*

**simple equations ( math)**

sorry i don't understand

*January 10, 2010*

**simple equations ( math)**

Share $100 between Joseph and Peter so that Joseph has 3 times as much as Peter.

*January 10, 2010*

**simple equations ( math)**

Mary has $38 and Jane has $12. How much must Mary give Jane so that they both have the same amount>?

*January 10, 2010*

**simple equations ( math)**

Let X= the n Peter's weight. 216 * 4/3 = 48 kg... am i right?

*January 10, 2010*

**simple equations ( math)**

well.... 36kg * 4/3 ???

*January 10, 2010*

**simple equations ( math)**

Tom's weight is 3/4 of Peter's. If Tom weighs 36kg, find the weight of Peters

*January 10, 2010*

**simple equations ( math)**

ook thanksss

*January 10, 2010*

**simple equations ( math)**

A shop sold 216 pairs of shoes in a month, which was equal to 60% of the number of pairs in the shop. How many pairs of shoes were in the shop at first??

*January 10, 2010*

**math**

how do u right it like a formula or a equation?? ex. X + 18 ..... ?

*January 10, 2010*

**math**

There are18 colour pages in a magazine, which is equal to 2(over)5 of the book. how many pages are there in the whole book? Please show the steps. thanks

*January 10, 2010*

**gr.7 math**

State whether or not each figure has rotational symmetry. a) scalene triangle b) equilateral triangle c) rectangle d) square e) regular hexagon

*January 6, 2010*

**math**

what is the tenths place?

*December 23, 2009*

**math**

what is the Tenths place

*December 23, 2009*

**sewing.**

can someone tell me if my answers are correct or not? thank you :) If your sewing machine were skipping stitches,wat would u check first? A.bobbin stitches B.needle setting C.thread type D.tucker my answer:A How do you secure the beginning and end of every seam? A.add a double...

*December 16, 2009*

**design.**

thanks guys :)

*December 15, 2009*

**design.**

pls help me answer this question. thank you:) youre repairing an armhole seam in a turtleneck used primarily for skiing.The stitching has come loose because of the extra movement.What type of hand stitch do you use? A.backstitch B.slipstitch C.running stitch D.blind stitch

*December 15, 2009*

**math 6 grade**

36

*December 3, 2009*

**history**

grade 7

*December 2, 2009*

**history**

its doesn't say anything. its just a question

*December 2, 2009*

**history**

how native cultures affected eropeans

*December 2, 2009*

**history**

umm which one do i choose?

*December 2, 2009*

**history**

is there more to it? any websites?

*December 2, 2009*

**history**

how the arrival of Europeans in north america affected native cultures

*December 2, 2009*

**Technology discovery**

History of development and applications of electrcity. A 3-5 page report. My mom is sick and I have no idea where to begin. Please help! Thank you

*November 29, 2009*

**math**

A certain number when divided by 4, 5 or 7 will have a remainder of 3, 4 and 6 respectively. Find the least possible value of the number. ( L.C.M. of 4, 5. 7) -1

*November 27, 2009*

**college english**

i have to write a 700 word essay on what will it mean to america if the economy declines in coming decades? What will happen if our debt is controlled by china? should we worry? I need help understanding what would happen if china held our debt

*November 23, 2009*

**Tecnology Discovery**

I Need a current event in technology discovery

*November 12, 2009*

**bookz**

could i find a geometry book at the libray?

*October 26, 2009*

**gr.7 math**

thank you!!!!

*October 26, 2009*

**gr.7 math**

what set of intervals would you choose to create a stem-and-leaf-plot for each set of data? 263 282 274 265 277 281 277 283 272 267

*October 26, 2009*

**geometry**

if <def < abc then <def <abc

*October 14, 2009*

**chemistry**

2 Mg(s) + O2(g)= 2 MgO(s) ÄH= -1204 kJ How many grams of MgO are produced during an enthalpy change of 96.0 kJ?

*October 2, 2009*

**Chemistry**

Okay so I need help with this question: How many grams of NH3 can be produced from 3.87 mol of N2? Can someone tell me how to do this probelm? Maybe do the question with a different set of numbers just so that I can see how to do it? Thank you!

*September 24, 2009*

**math**

im sorry but i do not understand :(

*September 23, 2009*

**math**

All the numbers from 1 to 99 are multiplied together. Use a pattern to determine the last digit of the product. Justify your answer.

*September 23, 2009*