Friday

October 28, 2016
Total # Posts: 1,451

**chemistry**

Determine the entropy change for the following displacement reaction. Cl2(g) + PbBr2(aq) → PbCl2(aq) + Br2(l). DS: (J/K mol) Cl2(g) 223.066; PbBr2(aq) 182.7; PbCl2(aq) 131.3; Br2(l) 152.231

*August 6, 2010*

**algebra 1**

Thanks! My calculator doesn't have that button, so the Google calculator will come in handy!

*July 30, 2010*

**algebra 1**

A=1020(1-0.195)exponent of 20 How do you figure out exponents that are high numbers?

*July 30, 2010*

**chem**

how did you get the 5.55 x 10^-3 ?

*July 24, 2010*

**algebra 1 **

Thank you! You were a lot of help!

*July 24, 2010*

**algebra 1 **

Use elimination to solve the the system of equations given by 10x-4y=-20 and 10x-5y=35. I can't figure this one out. Whenever I check my work, it is incorrect.

*July 24, 2010*

**algebra 1**

Thank you!

*July 24, 2010*

**algebra 1**

What point is a solution to the system of inequalities y(inequality arrow pointing right)4x and y(inequality arrow pointing right)-2x-3? -1/2,-2?

*July 24, 2010*

**English**

Thanks!

*July 12, 2010*

**English**

Hi, could you please tell me if these 2 sentences are correc. Each of the twins has a doll in their room. 2. The couple have gone on vacation. Also, when you have neither....nor, you use has don't you? Example Neither Helen nor Sarah has finished their homework.

*July 12, 2010*

**Algebra**

Salisbury High School decided to take their students on a field trip to a theme park. A total of 150 people went on the trip. Adults pay $45.00 for a ticket and students pay $28.50 for a ticket. How many students and how many adults went to the park if they paid a total of $4770

*July 6, 2010*

**Economics**

With the new UK emregncy budget what are the advanatages and disadvantages of decreasing the corporation tax?

*July 6, 2010*

**biology**

Thank you!

*July 5, 2010*

**biology**

When genetically engineering an organism, a plasmid a. is the main chromosome of the bacteria that is cloned. b. is cut with a restriction enzyme to accept the gene of interest. c. helps screen for cells that did not take up the gene of interest. d. combines with the gene of ...

*July 5, 2010*

**grammar**

Thank you soooo much for the help!! (0:

*July 1, 2010*

**grammar**

Can someone please check the errors I have noted and let me know if they see more? I am supposed to find 20 errors but can only find 15!! Please help. The correction is in parentheses. Why are great numbers of students choosing to pursue their college degrees using their home ...

*July 1, 2010*

**spanish**

Thank you so much! ¡Gracias!

*June 18, 2010*

**spanish**

(2 people talking to each other) "?Comen tus amigos contigo todos los dias?" "Si,_____ comen conmigo." a. nunca b. por la noche c. siempre d. manana C? There is a line above A in dias and a squiggly line above the first N in manana. Sorry about the ...

*June 18, 2010*

**spanish**

Thanks!

*June 17, 2010*

**spanish**

El profesor _____,y el estudiante _____. a. termina las clase/empieza la clase b. ensena/estudia c. ensenar mucho/estudiar d. empieza la clase/terminar I think B? There are squiggly things over the N's in ensena and ensenar.

*June 17, 2010*

**geometry**

Right triangle ABC is similar to triangle XYZ, because angle B is congruent to angle Y. If side AB equals 12 inches, side BC equals 27 inches, and side YZ equals 9 inches, then what is the length of side XY?

*June 9, 2010*

**chemistry**

How many grams of glacial acetic acid should be used to make 250 mL of 2.00 M acetic acid? Show all your work.

*May 31, 2010*

**chemistry**

How many grams of glacial acetic acid should be used to make 250 mL of 2.00 M acetic acid? Show all your work.

*May 31, 2010*

**Chemistry - **

create a balanced chemical equation and state the type of reaction. Zinc metal reacts with aqueous silver nitrate to produce solid silver and an aqueous solution of zinc nitrate. please go step by step, would be very helpful.

*May 29, 2010*

**spanish, again**

Thanks! I'll try that!

*May 29, 2010*

**spanish, again**

Thank you! I have a Windows PC. I would really appreciate the chart.

*May 29, 2010*

**spanish, again**

(upside down question mark) Que ____ hacer tu y yo para su cumpleanos? a.puedo b.puedes c.podemos d.pueden Is it C?

*May 29, 2010*

**spanish**

Thank you!

*May 29, 2010*

**spanish**

(upside down question mark)De quien es _____ sueter? a. este b. esta c. su d. esos A?

*May 29, 2010*

**chemistry**

change 120 ml to l .120 L then divide M by L to get moles 2.80 M/.120 L then take this and multiply it by the atomic weight or mass of NO

*May 23, 2010*

**Chemistry**

The most abundant isotope of the element nobellum has a half-life of 58 minutes. After 174 minutes the sample has a mass of .300 mg. What was the orignal mass of the sample? A. 1.20 mg B. 4.80 mg C. .600mg D. 2.40 mg

*May 23, 2010*

**chemistry**

Ba-140 has a half life of 13.0 days. What fraction of a sample will remain after 39 days?

*May 22, 2010*

**Chemistry**

The half-life of xe-133 is 126 hours. Starting with 250 mg, after 500 hours around how many mg remain?

*May 22, 2010*

**6th Grade Math**

yellow

*May 18, 2010*

**social studies**

sailor

*May 18, 2010*

**science**

what

*May 18, 2010*

**algebra**

how would you solve the follwing equation? (2c/c-4)-2=(4/c+5)

*May 17, 2010*

**math**

628. if there is more than 6 ones, its 628. if it says more than 6 ones, inclusive than it could be both.

*May 17, 2010*

**Geometry**

i believe it would be 56.52 (not 100% positive though) because if the radius is 6, then the circumference would be 3.14(6^2)= 3.14(36) which is 113.04 then you would put that over 360 and set up a proportion: 113.04/360 = x/180 (simplified to 20347.2/360) which gives you a ...

*May 17, 2010*

**math**

i think it would be 8 to 1 because 4000 -> 500 so 400->50 and 40->5 which would be 8->1

*May 17, 2010*

**algebra**

each week, mandy's algebra teacher gives a 10 point math quiz. after 5 weeks, mandy has earned a total of 36 points for an average of 7.2 points per quiz. she would like to raise her average to 9 points. on how many quizzes must she score 10 points in order to reach her goal?

*May 17, 2010*

**Social Studies**

india and china

*May 15, 2010*

**pyschology 1**

How would you use classical conditioning, operant conditioning, and observational learning to improve your academic performance? Give one example for each type of learning.

*April 18, 2010*

**MATH/OPTICS**

given di=145, do=38,hi=-97 formula: hi/ho=-di/do how do i rearrange this?? i do not want the answer. need help rearranging equation please help!!

*April 12, 2010*

**English **

It's A, because demonstrative pronouns = this, that, these, those.

*April 5, 2010*

**biology**

In mitosis, what is the size of a daughter cell relative to the size of the parent cell? If an onion cell has 10 chromosomes, how many double chromosomes does an onion cell have at the start of metaphase? Thanks!

*April 2, 2010*

**Chemistry**

Which of these is true about the following reaction? NaOH + HCl ¡æ NaCl + H2O A. NaOH is the proton acceptor. B. HCl acts as the Br©ªnsted-Lowry acid. C. NaOH and HCl are the products. D. This is an example of a neutralization reaction. E. The products ...

*March 29, 2010*

**Chemistry**

How much heat is given off when 24.0 g of methane is burned in air? The equation for the reaction is: CH4 + 2O2 => CO2 + 2H2O + 890 kJ What equation or formula should I use to solve this? Thanks!

*March 29, 2010*

**SCIENCE: GR.10 OPTICS CONVEX MIRRORS**

A convex security mirror has a focal length of -0.25m. A person with a height of 1.5m is 4m from the mirror. calculate the image distance and image height. AND An object 0.4m tall is placed 2.5m in front of a convex mirror that has a focal length of -90cm. Calculate image ...

*March 28, 2010*

**science optics**

A cosmetic mirror is 50cm from your face and the magnified image of your face is upright. You are told that the focal length of the mirror is 45cm. Explain why this focal length is not possible. I understand that the image would be magnified and upright...that's about it

*March 28, 2010*

**Math**

What is the product of the sum of 1.3 and 0.9 and the difference of 1.2 and 0.8

*March 22, 2010*

**p.e theory**

explain how stregths and weaknessess can affect your health and efficency in sport?

*March 14, 2010*

**Physics**

Thank you.

*March 8, 2010*

**Physics**

A rectangular piece of gold is 3.1 cm long and 3 cm wide. Resistivity of gold is 2.4*10^-8. How deep is the piece when it displays a resistance of R = 1.65 μω for a current that flows along the depth-direction? I used R=(p*l)/A and solved for l. I got the answer ...

*March 8, 2010*

**MATH**

how do you change metric units

*March 3, 2010*

**Math**

The formula for Simple Interest is Interest= Principle x Rate x Time. You fill in the formula- ?= 7540 x 4.5% x 10. Then, you turn the rate into a fraction- 0.045. Fill in the formula again, 7540 x 0.045 x 10, you multiply. 7540 x 0.045 x 10 = 3393. The interest after ten ...

*March 1, 2010*

**Science**

If my project is about a lie detecting project waht would be my independent, dependent, and controlled variable?

*February 28, 2010*

**biology**

Which objective (4x, 10x, or 40x) has the shortest depth of focus? Thanks for the help!!

*February 27, 2010*

**5th grade**

look in the dictionary

*February 24, 2010*

**viking age**

who are the vikings and what are their daily life, thank you

*February 20, 2010*

**music**

Character

*February 11, 2010*

**Math**

what is the total cost of the rechargeable batteries and battery chager?

*February 8, 2010*

**English - Mari Djata**

i think C

*February 1, 2010*

**Chemistry**

Approximately how many grams of NaNo3 will dissolve in 100g of water at 20 degrees Celsius?

*January 28, 2010*

**algebra**

Write a word phrase for 5p

*December 11, 2009*

**math**

Thank you! :)

*December 10, 2009*

**math**

So it would be half of his piece?

*December 10, 2009*

**math**

I'm doing a problem, and it says "Robert has a piece of twine that is 3/4 yard long. He needs a piece of twine that is 2/3 of this length. How long of a piece of twine does robert need?" Help?

*December 10, 2009*

**math**

How do you write repeating decimals as fractions? There's directions in my book,but I don't understand it? For example, how would you write as a fraction 0.81 with the 81 repeating?

*December 7, 2009*

**Physics**

To suck water up a straw to a maximum height of 187 mm, what minimum gauge pressure must be produced in the lungs? Note that in order to be able to suck up water, the pressure in the lungs must be lower than the pressure outside by the exact amount of pressure created by the ...

*November 25, 2009*

**crt 205**

I need to identify two arguments and define the premises and conclusion. I have to tell weather it is deductivly valid or inductivlely strong or in valid or weak and why. In the appendix 1 article Controlling Irrational Fears After 9/11. Can you help with this.

*November 22, 2009*

**math**

It becomes 17? But usually with problems like these aren't you supposed to subtract since it's an addition problem?

*November 13, 2009*

**math**

So the problem is 9 = w + (-8) I know the answer is 17. But I don't know how I solve it/show work.

*November 13, 2009*

**Writing**

Ooops! I'll try to find a word to substitute that.

*November 12, 2009*

**Writing**

Is "confidentialationalize" spelled like that?

*November 12, 2009*

**URGENT Grammar **

I think it is mental. Am I correct?

*November 12, 2009*

**URGENT Grammar **

Are you absolutely sure? You might be correct.

*November 12, 2009*

**URGENT Grammar **

In the sentence "She approved the apposed marriage" is approved a: (a)linking verb (b)action verb (mental) (c)action verb (physical)

*November 12, 2009*

**Grammar**

Then it must be an action verb mental.Right?

*November 12, 2009*

**Algebra**

For each function, find three ordered pairs that lie on the graph of the function. -6=3x+2y

*November 9, 2009*

**travel and tourism**

$2.

*November 9, 2009*

**math**

Solved both!

*November 6, 2009*

**math**

I figured out the first one. Still trying number 2.

*November 6, 2009*

**math**

1.Explain why there is no number that can replace N to make the equation |n| = -1 true. 2. List the integers that can replace N to make the statement -|8| < n < -|-5| true. I don't really get what am I supposed to do?

*November 6, 2009*

**to kill a mockingbird**

I'm reviewing for my test about the novel "To Kill a Mockingbird". There's this question I can't answer: 1. What are the generalizations (like stereotyping) made about black people? Who makes them? And how are black people affected by it? The same ...

*October 28, 2009*

**math**

In my book, it says to use a number line to find the sum of the equations. Should I draw a numberline on my paper, or just write down the answer on the paper?

*October 22, 2009*

**physics**

Work= force * distance Multiply 12.0 m and 25 N and that's your answer

*October 21, 2009*

**math**

15 ***********--------- *********/| | ********/ | | 20 *****25/ | | ******/ | | *****/____|________| *****15*******15

*October 20, 2009*

**math**

Ahh. The shape didn't show. Basically, it's a rectangle with like a triangle on the side of it. 15 on the top, 25 on the side with the triangle point, 20 on the right side, 15 on the bottom, where the triangle is. and 15 on the bottom of the rectangle

*October 20, 2009*

**math**

So, I need to find the area of this shape. It's an irregular shape, and I don't know how to figure it out. The shape looks like, 15 -------- /| | 25 / | | 20 / | | / | | /____|______| 15 15 I was told the answer was 450. Though I don't know how to figure 450 out?

*October 20, 2009*

**math**

i still don't get what a prime number is?

*October 17, 2009*

**math**

The formula for the area A of the triangle is A=1/2BH, where B is the length of the base, and H is the height. Solve the equation for B. I don't know how I'm supposed to be able to figure this out?

*October 16, 2009*

**math**

What are algebraic models? There's a problem and it says to use an algebraic models to answer the questions. I don't know what those are?

*October 13, 2009*

**math**

What is 7(y+3)+2y simplified? and if possible, can you break down how you got it? Simplifying equations confuses me easily.

*October 13, 2009*

**Math**

sue correctly answered 42 of the 50 questions. what percent of the questions dud she answer correctly?

*October 8, 2009*

**Science**

Thanks!

*October 4, 2009*

**Science**

What is the difference between direct and indirect sunlight?

*October 4, 2009*

**social studies,word unscrambler**

what???? :)

*September 28, 2009*

**art(need help)**

i know these are a few questions but i just can't find them anywhere.i really need to know why the bauta mask was made,how you make one,who made it, and it's texture.if you could help me with any of these,i would be so thankful.

*September 21, 2009*

**art**

I just need to know who made the'bauta mask"?

*September 19, 2009*