Sunday

April 20, 2014

April 20, 2014

Total # Posts: 803

**Chemistry**

calculate the amount of heat generated when 50g of water is condensed at 100 degrees celsius

**Chemistry**

Difference between ionic radius and atomic radius

**Physics**

tanx dats d answer

**Physics**

A block of mass 5kg is lifted 2m in 3sec. Find the work done.

**Chemistry (The Composition of an Atom)**

In 1808, John Dalton wrote his atomic theory of matter. The following is a list of points from that theory. If it is still considered true today, label it true. If it is not considered true today, label it false. 1)Atoms cannot be subdivided. 2)Atoms cannot be created or destr...

**math**

Mesa wants to order salad, pizza, and dessert, but he can't decide in what order he wants to eat them. How many different choices does he have?

**elementry algebra**

use the slope intercept form to graph the equation y=2x+2

**Bio - Reproductive Organs**

whoever posted this is totally doing the mcmaster anatomy quiz im currently doing lol

**math**

4 weeks x 12 months = 48 pay peroids. so no a month is not equal to 4 weeks. 52 weeks in a year. You would take the the weekly amount the employee is paid and x's it by 52 and then divide it by 12.

**Math**

15/125 = 8.333 groups of 15 students 8.33 x 3 (chaperons) = 24.99 rounded 25 :-)

**Math**

An art gallery has reserved ten locations for Maggie's show. Maggie has ten paintings but is uncertain how to display them. She insists on trying every possible arrangement before making her decision! If she takes 1 minute to set up and view each arrangement and works 10 h...

**Chemistry (Acids and Bases)**

thank you very much

**Chemistry (Acids and Bases)**

THIS HAS TWO PARTS NaOH(s) was added to 1.0 L of HCl(aq) 0.42 M. 1) Calculate [H3O+] in the solution after the addition of 0.13 mol of NaOH(s). 2) Calculate [H3O+] in the solution after the addition of 0.81 mol of NaOH(s).

**Chemistry (Acids and Bases)**

thank you very much

**Chemistry (Acids and Bases)**

The natural pH of rainwater is 5.6. The acidity of rainwater is caused by the dissolution of (TRUE OR FALSE) boric acid sulfuric acid carbonic acid calcium carbonate calcium oxide nitric acid

**algebra**

the formula r= -0.075t + 3.85 can be used to predict the world record for the 1500 meter run, t years after 1930.find an inequality that identifies the years in which the world record will be less than 2.8 minutes

**science**

what is an explanation for the relationship between currents and the brightness of a light bulb??

**english**

I am having some serious problems with parallelism. I do not understand how to use parallelism. I've read the lesson in my textbook and I've looked at different websites that help explain it, but I just can't get it. Can anyone break this down in "layman's...

**Statistics**

The length of time it takes college students to find a parking spot in the library parking lot follows a normal distribution with a mean of 4.0 minutes and a standard deviation of 1 minute. Find the probability that a randomly selected college student will take between 2.5 and...

**Algebra 1**

Explain the differences between solving these two equations: Brake down the steps. log3(x - 1) = 4 and log3(x - 1) = log34 )

**Algebra 1**

Explain the differences between solving these two equations: •log3(x - 1) = 4 AND log3(x - 1) = log34 I think it has to deal with the formulas?

**Andy**

Name: Lesson 3 Assignment.Instructions Explain the differences between solving these two equations: •log3(x - 1) = 4 and log3(x - 1) = log34. I think it has to do with the formulas

**Calc-slopes & concavity**

1. Let f(x)=x^3-3x+2 a.) Find the equation of the line tangent to the graph of y=f(x) at x=2 b.) For what values of x is the function increasing? c.) For what values of x is the graph concave down?

**English 12**

okay thank you!

**English 12**

In your understanding is this thesis statement clear enough? What other improvements would you make? The topic is "Theme of Overcoming struggle in the course text" Many themes are presented in: Hamlet, Death of a Salesmen, Life of Pi, the Road, and the Kite Runner th...

**IT computer memory**

No, incorrect. Be carefull with this, your: 18MB x 10^6 x 8 bits = 144,000,00 Should in fact be: 18mb x 2^20 x 8 bits = 150,994,994 Your second part is correct, so its 4 megabits per second = 4 x 10^6 = 4,000,000 Answer: 150994994 / 4000000 = 37.75 seconds.

**math**

A student claims that every prime greater than 3 is a term in the arithmetic sequence whose nth term is 6n + 1 or in the arithmetic sequence whose nth term is 6n - 1. Is this true? if so, why?

**11th grade math **

The equation Ax^2 + 4y^2 = 16 represents an ellipse. Find all values of A such that its intersection with y = |x| has coordinates (x,y) which are integers.

**Math**

The equation Ax^2 + 4y^2 = 16 represents an ellipse. Find all values of A such that its intersection with y = |x| has coordinates (x,y) which are integers.

**physicis**

How much power does it takes to do 104 J of work in 8 seconds

**physicis**

How far will 350 J raise a 7kg mass?

**English**

Can anyone see any rhetorical device in this sentence? His father’s voice: You gonna let ’em push you around like that, boy? “No sir, Daddy,” Perry whispered. “I sure as hell ain’t.”( Sigler 227)

**math**

Sum of a 3 digit # is 24. Ones digit is 2 more than 2xs the hundred dig. Tens dig is 1 more thn 3xs the hund dig. Wats the #??

**chemistry**

2 Na202 + 2H20 -> 4NaOH + 02 When 200.g of Na202 were reacted, 32.0 g of 02 were collected. The yield of 02 collected was (how many percentages)

**English 12 U**

Please ignore my previous post, I accidentally posted my rough draft Okay for English 12 U, I'm doing a literary essay for Life of Pi, by Yann Martel. The topic of my essay is Martel (author's) depiction of setting in Canada and India. (Role of setting) I'd like so...

**Math**

Many thanks

**Math**

The path of a cliff diver as he dives into a lake is given by the equation y= -(x-10)^2+75, where y meters is the divers height above the water and x meters is the horizontal distance travelled by the diver. What is the maximum hight the diver is above water? Is the answer to ...

**Math**

The path of a cliff diver as he dives into a lake is given by the equation y= -(x-10)^2+75, where y meters is the divers height above the water and x meters is the horizontal distance travelled by the diver. What is the maximum hight the diver is above water? How can I find th...

**English 12**

Yesterday, i posted a question about writing a thesis for Life of Pi. However i'm not sure how to develop a thesis from my topic. The topic of my essay is "Yann Martel's depiction on the role of setting in India and Canada". If anyone can kindly help me to de...

**English 12**

alright thank you, ill post a question later on when i develop a thesis

**English 12**

Okay, for English 12 im doing a semiar on Yann Martel's book, "Life of Pi" The topic of my essay is "martel depiction of Canada and India= the role of setting" My main body paragraphs are Setting in Canada Setting in India Setting in the Ocean what im a...

**physics**

you're not following the sig fig rule- it's -110 because you can only have 2 significant figures.

**Finance**

I need help writing scenario style questions for a school business management class

**Bio Lab**

You need to prepare medium for your culture cells. Your salt solution is 10x concentration, dilute to 1x for use. You also need to add fetal bovine serum for a final concentration of 10%. What would you add of each for the correct final concentrations in a liter of media?

**Organic Chemistry**

What would have happened if we had forgotten to neutralize the aqueous solution before recrystallization?

**Physics**

Sam is taking his girlfriend Sally out for a ride in his boat. He starts out at rest. He accelerates with an acceleration of 0.263 m/s^2 for 92.1 s. At that time Sally decides they are going fast enough and the boat moves at constant speed for a distance of 286 m. Then Sally d...

**science**

Do plants grow better with tap water or distilled water?

**chem--need help, please!!!**

thank you very much, DrBob222!

**chem--need help, please!!!**

Ka for benzoic acid, C6H5COOH, 6.5x10^-5. Calculate the pH of solution after addition of 10.0, 20.0, 30.0, and 40.0 mL of 0.10 M NaOH to 40.0 mL of 0.10 M Benzoic acid. PLEASE CHECK MY ANSWER!!!!! My answer is: Moles acid = 0.040 L x 0.10 M = 0.0040 Moles base = 0.010 L x 0.10...

**social studies**

What is the base for the earth's hills and mountains?

**physics**

does each of the two lenses used in a microscope produce a magnification of the object being viewed?

**AP Human Geography**

idiocy

**Biology**

Are there any viruses/diseases in the tundra?

**math**

marcias house is approx. 10 miles east of the airport. a jet is flying directly over her house after taking off from the airport and flying approx. 12 miles. approx how many miles high is the jet when it flys over marcias house?

**math**

when a marble hits a wall at a 22 degree angle, what is the measure of the angle between the two paths of the marble?

**History**

What difficulties did the Pilgrims encounter in their attempt to gain passage to the New World?

**chem**

what are the net ionic equations for ClO3^-; Zn^2+ undergo hydrolysis?

**math**

the equation is f(x) = (1/sq. root of 1-x^2) 1. f(x) is never zero. 2. 0 is in the domain of f 3. All negative real numbers are in the domain of f 4. All positive real numbers are in the domain of f 5. 1 is in the domain of f 6. f(x) is never negative 7. f(x) is never positive...

**physics**

The pilot of an airplane traveling 180 km/h wants to drop supplies to flood victims isolated on a patch of land 125 m below. The supplies should be dropped how many seconds before the plane is directly overhead? ______s

**physics**

A ball is thrown horizontally from the roof of a building 60 m tall and lands 45 m from the base. What was the ball's initial speed? _______m/s

**Chemistry**

Than from here I need to find: Using the volume of solvent calculated in step 1, calculate how much sulfanilamide will remain dissolved in the mother liquor after the mixture is cooled to 0 degree Celsius? Can you please explain?

**Chemistry**

thank you!

**Chemistry**

Please help the question that I got is: Calculate how much 95% ethyl alcohol will be required to dissolve 075g sulfanilamide at 78 degree Celsius. Knowing that solubility of sulfanilamide is 210 mg/ml at 78 degree Celsius, 14mg/ml at 0 Degree Celsius. please explain.

**Science**

thank you

**5th grade**

327,676

**algebra 8th**

ok gat it

**algebra 8th**

YOU THINK? BUT I HAVE TO DO ALL THE PROBLEM

**algebra 8th**

ADD OR SUBTRACT> 5.2-2.5 HOW DO I DO THIS?

**chem**

What is the total pressure in mm Hg of a gas mixture containing argon gas at 0.25 atm helium gas at 350 mm,Hg, and nitrogen gas at 360 torr.

**chem**

What is the volume in liters of 3.2 moles methane gas, CH4, at 12degrees C and 1.52 atm?

**chem**

An airplane is pressurized to 650mmHg , which is the atmospheric pressure at a ski resort at 1.30×10^4 altitude.If air is 21 % oxygen, what is the partial pressure of oxygen on the plane?

**biochemistry**

an intramalecular meds is given at 5.0mg/kg of body weight. if you give 425mg of medicatioon to a pt. what is the ppTIENT weight?

**biochemistry**

ordered 1.0g of tetracycline to be given every 6 hours. on hand 500mg. how many will we need for 1 days treatment?

**Literature**

During the Renaissance, people rediscovered the literature of the past. True or False? At that time there was an enormous renewal of interest in and study of classical antiquity. So True, right? Just wanna make sure, Thanks.

**personal finance**

Sue and Tom Wright are assistant professors at the local university. They each take home about $42,000 per year after taxes. Sue is 37 years of age, and Tom is 35. Their two children, Mike and Karen, are 11 and 9. Were either one to die, they estimate that the remaining family...

**personal finance**

Sue and Tom Wright are assistant professors at the local university. They each take home about $42,000 per year after taxes. Sue is 37 years of age, and Tom is 35. Their two children, Mike and Karen, are 11 and 9. Were either one to die, they estimate that the remaining family...

**chem**

Calculate the specific heat (\rm{J/g \; ^\circ C}) for a 21.5 g sample of a metal that absorbs 685 J when temperature increases from 42.1^\circ C to83.2^\circ C.

**chem**

Calculate the specific heat (\rm{J/g \; ^\circ C}) for a 18.5-\rm g sample of tin that absorbs 183 {\rm J} when temperature increases from 35.0 ^\circ \rm C to 78.6 ^\circ \rm C.

**bio**

A typical adult body contains 55 \% water. If a person has a mass of 70.0 kg, how many pounds of water does she have in her body?

**Biology**

can anyone please help me answer this question: How is DNA put together into chromosomes?

**chemistry**

Complete and balance the displayed half reaction in neutral aqueous solution taking into account the electrons. Mg(s) → Mg2+(aq)

**biology**

Does asexual reproduction of sponges depend on time of year, availability of food, or other factors?

**Biology**

sorry, this link does not answer these specific questions!

**Biology**

Under what conditions does asexual reproduction in sponges occur? Does it depend on time of year, availability of food, or other factors?

**Science**

What is the pH of a 2.62 x 10^-2 M HBr solution? thanks

**chem can u check answer please**

thanks so much

**chem can u check answer please**

Which is NOT a chareteristic property of acids? A: react with carbonate to yield CO2 gas B: taste sour C: neutralize bases D; turns litmus red to blue E:reacts with metal to yield H2 gas I reckon its D because isnt it the other way around ? Blue to red ...not...red to blue Any...

**chem can u check answer please**

what is the hydrogen ion concentration of an aqueous solution with a pOH of 9.262? I got 5.47X 10 ^-10 is this correct? Thanks Andy

**chem can u check answer please**

the solubility of silver sulfate in water is 0.223%(w/v) at 35 degrees celsius.calculate the solubility product of this salt at this temp. I got 1.46 X 10^-6 M is this right please thanks Andy

**Chem/science**

what is the ph of 2.62 x 10 ^-2 M HBr solution? I get 5.94 is that right? thanks andy

**Chem/science**

What is the conjugate acid of HC5H6O4-?? Is it HC5H6O42-?? thanks andy...

**Chemistry**

Why can't benzene dissolve sodium chloride?

**3rd grade**

Ineed help with the synonyms and antonyms ex. perfect, frawless is this an antonym or synonym?

**SCIENCE?CHEMISTRY*****

Dr Bob each time i do a problem on this site I have to print out answer....is there any way you know how to save it to usb stick???? I cant for the life of me find a save feature... also how do YOU when you give us a link to a site ...make it appear in blue and all we have to ...

**SCIENCE?CHEMISTRY*****

thanks dr bob Andy

**SCIENCE?CHEMISTRY*****

Am using the inventory method at moment but am stuck on how fill i the inventory for __Agl+__Fe2(CO3)3--> __Fel3+__Ag2CO3 I think the brackets are throwing me Hows this element b4 after ------------------------------------ Ag 1 2 l 1 3 Fe 6 1 CO 3 3 I dont know if this is r...

**SCIENCE?CHEMISTRY*****

well done thanks... Andy

**SCIENCE?CHEMISTRY*****

an 56 Fe 2+ particle has how many protons neutrons amd electrons??? 56 2+ Fe Thanks Andy

**SCIENCE?CHEMISTRY*****

how many dozens of dust particles are in 2.45 g if each particle has a mass of 2.51 x 10^-4 grams...? I dont have a clue!!!!!! Thanks Andy

**SCIENCE?CHEMISTRY*****

thanks..... andy

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