# O-Chem 253

7,319 results

**4th grade math**

The drill team is selling cookies to raise money. It costs .78$ to make each cookie. They sell them for $1.50 each. If they sell 253 cookies, how much profit will they make? Do I have to subtract the .78 from 1.50 then multiply that answer by 253? Or do i forget about the $1....

**Calculus**

Find a formula for the fourth degree polynomial p(x) whose graph is symmetric about the y-axis (meaning it has no odd powers of x), and which has a y-intercept of 10, and global maxima at (3,253) and (−3,253).

**math- check me**

Sung rented a truck for one day. There was a base fee of $17.99, and there was an additional charge of .90 cents for each mile driven. Sung had to pay $253.79 when he returned the truck. For how many miles did he drive the truck? $253.79=$17.99+.90 -$17.99 $$238.80=.90 divide ...

**chem need help**

The most prominent line in the atomic spectrum of mercury occurs at a wavelength of 253.652 nm. What is the energy of 0.625 moles of photons associated with the most prominent line? Express answer in kJ. ANS: 295 kJ Please explain.. Thank you so much!

**physics**

A block of mass 4.253 kg is released on the track at a height 5.52 m above the level surface. It slides down the track and makes a head-on elastic collision with a block of mass 17.012 kg, initially at rest. The acceleration of gravity is 9.8 m/s2 . Calculate the height to ...

**physics**

A triple beam balance, like the scales we use every week in lab, works using rotational equilibrium. If a 253 g mass is placed on the pan, 1 cm from the pivot, and there are three masses, 1 g, 10 g, and 50 g masses on the other side can be slid back and forth between 0 cm and ...

**statistics**

Each person in random sample of 247 male and 253 female working adults living in Calgary, Canada was asked how long, in minutes, his or her typical daily commute was. use the accompanying summary statistics and an appropriate hypothesis test to determine if there is convincing...

**Precalc**

Can you simplify radical 253?

**algebra**

how do you solve for y in the equation 1/y=(1/3)x^3-(253/12)

**Physics**

A 6090kg space probe mobing nose-first toward Jupiter at 105m/s relative to the Sun, fires its rocket engine ejecting 80 kg of exhaust at a speed of 253 m/s relative to the space probe. What is the final velocity of the probe? I should have gotten 108m/s Can you show me the ...

**Chemistry**

If 2.5 g of NaOH is dissolved in 253 mL of water, what is the pH of the solution?

**math**

how do you say 0.253 and 7.632 in word form?

**government- banking industry**

What happened when the government deregulated the banking industry? Since this is not my area of expertise, I searched Google under the key words "bank deregulation" to get these possible sources: (Broken Link Removed) http://www.socialstudieshelp.com/Eco_Deregulation.htm http...

**math**

Weekly pay: $253.07 Not married Exemptions: 3 What is the federal tax?

**Chemistry**

Calculate the mass of a 0.253-mL sample of a liquid with density 0.789 g/mL

**Math Help**

Perform the calculation mentally 1. 90 + 247 + 253 + 110 2. 799 - 117 3. 25 × 25 × 8

**business math**

Weekly pay: $253.07 Not married Exemptions: 3 What is the federal tax?

**math**

The population is 2,253,291 in 2000 and 2,264,617 in 2001. What is the growth rate? Thanks!

**physics**

A jet travels at 435 m/s. How long does it take to travel 253 m? Answer in units of s

**physics**

how many energy is transferred when 8.9g of liquid hydrogen changes to gas -253 degree celsius

**math**

1,643,253 round to the nearest hundred thousand.is this the right answer 1,640,000

**math.**

1. 4.86/0.2 24.3 2. 2.52/0.7 3.6 3. 14.4/1.2 12 4. 17.1/3.8 4.5 5. 3.96/1.32 3 8. 1.296/0.16 8.1 10. 8.253/0.5 16.506 12. 1.50048/0.32 4.689 14. 4.4208/1.8 2.456 16. 160.3639/25.1 6.389

**CHILD DEVELOPMENT**

Which of the following budget items is usually given the lowest priority in running a child care facility? A. CLASSROOM MATERIALS B. SALARIES and BENEFITS C. MAINTENANCE D. SCHOOL EQUIPMENT salaries and benefits Since this is not my area of expertise, I searched Google under ...

**Chemistry**

How many moles of chloroform, CHCl^3, are required to fill a 253-ml flask at 100.0 degrees Celsuis and 940 torr?

**physics**

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by 107 J of work (10.0 kW...

**physics**

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by 107 J of work (10.0 kW...

**physics**

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by 107 J of work (10.0 kW...

**physics**

(a) What is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0°C and a cold reservoir temperature of -20.0°C? (b) How much heat in kilocalories would it pump into the warm environment if 3.60 multiplied by 107 J of work (10.0 kW...

**Math permutations**

pi=(245)(1354)(125) 1) Write as a product of disjoint cycles. Ans: (14)(253) Is this correct? 2) Solve : pi^2, pi^5,pi^(-1) 3) What's the order of pi? and why?

**Algerbra**

Find three cosecutive odd intrgers such that when twice the smallest is added to five times the largest the result is -253

**OCEANOGRAPHY HELP**

Sediments composed of particles of one size are called ___________. I think it's well-sorted but am not sure. You are correct. See: http://72.14.253.104/search?q=cache:BtQzENSvQ4MJ:flightline.highline.edu/wmoses/Ocean101/OC101PowerPoints/Sediments.ppt+Sediments+%22particles+of...

**physics**

The largest tension that can be sustained by a stretched string of linear mass density μ, even in principle, is given by τ = μc2, where c is the speed of light in vacuum. (This is an enormous value. The breaking tensions of all ordinary materials are about 12 ...

**chemistry**

49.5(0.506-x)(0.253-x)=4x^2 How to make it in quadratic equation Please help with step by step. thank u so much

**Chemistry**

What molarity of KNO3 should be used in order for dilution of 63.2 mL to yield 253 mL of 0.319 M KNO3?

**Geometry**

I need to find surface area of triangular prism-dimension of base is 9.9 by 6.2 distance between bases is 14.6 choices are: 436.278 466.97 332.94 253.46 Thank you

**physics**

A bullet is ﬁred straight up from a gun with a muzzle velocity of 253 m/s. Neglecting air resistance, what will be its displacement after 2.9 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m

**Math**

Round 1,643,253 to the nearest hundred thousand. I say it's 1,600,000 but the workbook says 1,700,000. Please explain.

**health**

how much dose smoking cost Ontario canada taxoayers because of health care? plz answer asap! Your exact answer is at the following site page: http://72.14.253.104/search?q=cache:PFmJA0Kt4-EJ:councilarchive.region.halton.on.ca/cdm/cdm/rphs/rp2000/aghs0900/mo3400.pdf+%22smoking+...

**SCIENCE**

The_____________ of a portion of a lithospheric plate determines its final elevation. I can't find an answer. Since this is not my area of expertise, I searched Google under the key words "lithospheric plate elevation" to get these possible sources: (Broken Link Removed) http...

**Math**

What is the maximum slope for a bridge on an interstate? Since this is not my area of expertise, I searched Google under the key words "maximum slope interstate bridge" to get this possible source: http://72.14.253.104/search?q=cache:_pnq5Gew-asJ:www.modot.mo.gov/...

**Math College 115**

t. Q (t) 0. 900 1. 802 2. 714 3. 636 4. 567 5. 505 6. 450 7. 401 8. 357 9. 318 10. 283 11. 253 12. 225 Construct an exponential decay functiom Q(t), where t is measured in minutes. Q (t)=__?____ x (1/2)^ (_?_)

**mgt 253**

need to prepare rations for my own business but simply finding and listing the rations for the industry that your business will be in

**Algebra**

If you drive 253 miles on 11 1/2 gallons of gas, what is the simplified ratio of miles to gallons? ____ to 1?

**Biology**

Are IV fluids hypertonic, hypotonic, isotonic? The tonicity depends on what fluids are being used in the IV. Since this is not my area of expertise, I searched Google under the key words "IV fluids hypertonic hypotonic isotonic" to get these possible sources: http://www.efn....

**algebra**

If you drive 253 miles on 11 1/2 gallons of gas, what is the simplified ratio of miles to gallons?

**chem**

what are the other practical applications of Analytcal chem on being a medical technologist?

**chemistry**

can you please give me some practical applications of qualitative chem and quantitative chem...

**AP CHEM**

For the reaction A + 2B + C ----> 2 D + E the following initial concentration and initial reaction rates are found: [A]null (M) [B]null (M) [C]null (M) 0.150 0.150 0.150 0.275 0.150 0.150 0.275 0.564 0.150 0.150 0.314 0.253 0.193 0.314 0.217 initial rate wrt E (Ms^-1) 0.210...

**Acc. Algebra 2**

Jan invested $1200 at a certain simple interest rate and $2200 at 3%higher. Her annual earnings were $253. Find the two interests rate if she earned $121 more on the larger investment than on the smaller.

**Algebra**

I'm totally confused help please?!? In 1990, 253 million people visited theme parks in the United States. In 2000, the number of visitors increased to 317 million people. What was the percent of increase?

**Chem 400**

Direct reaction of solid iodine (I2) and gaseous chlorine (Cl2) produces an iodine chloride,(IxCly), a bright yellow solid. 0.678 g of iodine (I2) is mixed with 0.851 g of chlorine (Cl2). After the elements react, some chlorine is left over along with a single compound that ...

**chem- drbob222 please help**

my original question was: how do i figure this out?? How much heat does your body lose when 2.46 g of sweat evaporates from your skin at 25°C? chem - DrBob222, Tuesday, February 22, 2011 at 10:52pm q = mass water x delta Hvaporization. chem - Rebekah, Wednesday, February 23, ...

**Chemistry**

A compound has the empirical formula CHCL .A flask with volume 253 cm3 at temperature of 373K and pressure of 1.0 atm contains 0.8 g of the gaseous compound. Find the molecular formula of the compound.

**Data management**

1)SOLVE: a) 2nP3 = 2(nP4) b)6(n+1P2) = 3nP2 2) If (nC12 = (nC8), find (nC17) and (22Cn) 3)simplify. a) n(squared) (n-2)! - n(n-2)! / n! b) (nC2) - (nCn-2) 4)If nPr - 506 and (nCr_ = 253, find n and r. 5) If (28C2r)/(24C2r-4) = 225/11, find r.

**math**

what is a number model? Since this is not my area of expertise, I searched Google under the key words "number model" to get these possible sources: http://www.minet.uni-jena.de/~novak/model.html http://72.14.253.104/search?q=cache:Jv_3THbD6vIJ:andean.kulture.org/owen/...

**social studies**

Are the symboles of dimocracy important? should the government make more effort to maintain and explainthese symboles? What symbols of democracy? I can think of no symbols that are unique to democracies except a voter registration card, and even some non democracies have those...

**math**

a metal cutter was accurate to the nearest micron.about how many pieces of metal 0.8188 centimeters long could the metal cutter cut from a 32.253 length of metal?

**physics**

Salmon often jump waterfalls to reach their breeding grounds. Starting 1.77 m from a waterfall 0.253 m in height, at what minimum speed must a salmon jumping at an angle of 44.8 leave the water to continue upstream? The acceleration due to gravity is 9.81 m/s2 . Answer in ...

**math**

Find the sum of the first 33 terms of the arithmetic sequence whose first term is 3 and whose 33rd term is -253

**Algebra1**

Find the sum of the first 33 terms of the arithmetic sequence whose first term is 3 and whose 33rd term is -253.

**math**

I am having a difficult time calculating rates and unit prices. Can someone describe a simple process for using rates and unit prices that will help me understand these concepts? I searched Google under the key words "rates 'unit prices'" to get these possible sources: http://...

**psychology**

What are the 3 c's of johnson and johnson described for safe and productive schools. Give an example of how this might work. What is the link that researchers have found between aggression and students conflict This abstract reviews the 3 c's. I'm sure you can think of ...

**Algebra**

A scientist wants to research the potential spread of germs by contact. She knows that the number of possible handshakes within a group of n people is given by the equation N=1/2(n^2-n). Everyone at a party shook hands. There were 253 handshakes in all. How many people ...

**O-Chem 253**

I hydrolized the following compound: cis-norbornene-5,6-endo-dicarboxylic anhydride then took the cis-norborene-5,6-endo-dicarboxylic acid and added H2SO4 to it (warmed it up and cooled it) then added drop by drop water (then I reheated the mixture and crystallized it again). ...

**human biology**

I need some information on the nephron and H+ ions. My book just has it in a diagram, but the diagram talks mostly about the K+ ion relationship. Can someone just give the gist of the H+ relationship with the nephron? thanks Since this is not my area of expertise, I searched ...

**Science HELP!**

when an electric current passes through water during the process of electrolysis, 2 gases are formed. one gas has a boiling point of -183 C and the other gas has a boiling point of -253 C. Has a physical or chemical change occured? Explain.

**Science, pls help Ms. Sue!!!!!!!**

an electric current is passed through water in the process of electrolysis two gases are formed one has a boiling point of -183 C and the other one has a boiling point of -253 has a chemical or physical change ocured

**chem**

so i posted this question yesturday and got some help. which is the stuff below. can you look at the last thing i said which was the answer i got by doing what DrBob222 said to do and tell me if its correct.(the question is the first section) thanks chem - hannah, A salt ...

**chem chem**

hi does anyone know what the VSPER theory is

**Science**

when an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has the boiling point of -183 C and the other has a boiling point of -253 C. Has a physical change or a chemical change occurred? explain.

**chem**

if a car produces 81g of {\rm CO_2}, how many grams of {\rm O_2} are used up in the reaction? the complete chem reaction is C2H6O+3O2--->2CO2+3H2O

**Physics**

A pair of narrow parallel slits separated by a distance of 0.253 mm are illuminated by the green component from a mercury vapor lamp (λ = 545.1 nm). What is the angle from the central maximum to the ﬁrst bright fringe on either side of the central maximum? Answer ...

**chemistry**

A volatile liquid was allowed to evaporate in a 43.298g flask that has a total volume of 253 mL. The temp of the water bath wad 100 °C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vaporous was 44.173g. Calculate the molar mass of the liquid

**green valley college**

automotive airbags inflate when sodium aside NaN3 Rapidly decomposes to its consistent elements. the equation for the chemical reaction is NaN3=Na+In2 The gaseous N2SO generated inflates the airbag. How many moles of NaN3 would have to decompose in order to generate 253 ...

**Chem Help!**

I really need help with this question for my chem H.W. 1) On a summer day in Breckenridge, Colorado, the atmospheric pressure is 525 mm Hg. What is this air pressure in atmospheres? (round to the hundredths place) atm

**Math**

The table below shows the height (in inches) and weight (in pounds) of eight basketball players. Height=67 69 70 72 74 74 78 79 Weight=183 201 206 220 226 240 253 255 What is the correlation coefficient of the set of data? Round your answer to the nearest thousandth. a. -0.946...

**Biology**

For each of the folliwng groups of animals (marine invertebrates, marine vertebrates, fresh-water animals & land animals) describe osmosregulatory probkems they face and how they cope with them? I think what you need can be found at the following 3 sites: http://en.wikipedia....

**Algebra**

I just need help setting up the equation - the rest I can do on my own: A man built a walk of uniform width around a rectangular pool. If the area of the walk is 253 square feet and the dimensions of the pool are 9 feet by 3 feet, how wide is the walk?

**Math (1 question)**

estimate the area of a circle with a radius of 27 meters. Use 22/7 for pi. A. 258 square meters B. 1,125 square meters C. 2,291 square meters D. 5,253 square meters

**math help**

Tom was engrossed in his 340 page book. He stopped on page 127 at noon to eat lunch. He stopped on page 253 to eat dinner.How many pages did tom read during the afternoon

**math**

Tom was engrossed in his 340 page book. He stopped on page 127 at noon to eat lunch he stopped on page 253 to eat dinner.how many pages did tom read during the afternoon?

**Math**

I know if you type Alt + 253 it will give you an exponet. I was wondering if anyone knows how to type a radical symbol? Thanks HOLD ON ALT AND TYPE 251 AND LET GO RIGHT AWAY GIVE IT A SECOND AND THE RADICAL SIGN SHOULD COME UP

**math**

Tom was engrossed in his 340 page book. He stopped on page 127 at noon to eat lunch. He stopped on page 253 to eat dinner. How many pages did tom read during the afternoon

**Chem- bobpursley**

What mass of protons would be required to just neutralize the charge of 1.5 g of electrons? my teacher said .0015kg times 1e-/.00091e-27kg times 1pt/1e- times 1.67262e-27 over 1 p chem - bobpursley, Tuesday, September 21, 2010 at 6:48pm That is what I would do also. But I ...

**pre algerba**

Tom was engrossed in his 340 page book. He stopped on page 127 at noon to eat lunch. He stopped on page 253 to eat dinner. How many pages did tom read during the afternoon

**Physics**

Suppose a nucleus of 93X236 fissions into two fragments whose mass ratio is 0.37:0.63. With the aid of the drawing, estimate the energy (in MeV) released during this fission. Ive treied to do this problem but i keep getting the wrong answer. I keep getting 164.253 MeV

**chem - br bob is this right**

What is the pH of a solution prepared by adding 4.000 grams of NaOH to a 50.00 mL of a buffer that is 2.00 molar both in acetic acid and sodium acetate? (Assume final volume is still 50.00 mL) * chem - DrBob222, Wednesday, April 21, 2010 at 10:52pm * chem - phil, Wednesday, ...

**sociology**

What kind of measures do sociologists use to calculate prejudice other giving a person an implicit association test? Essentially prejudice depends on how you divide people into "us" and "them" categories. There are various types of scales used (e.g., Likert-type scales and ...

**Chem**

What causes dispersion forces? Disperson forces are caused by an unsymettrical distribution of charge in the molecule, causing a net electric force. http://www.chem.purdue.edu/gchelp/liquids/disperse.html

**math**

How do you find the interest and the new balance on these charge accounts? Balance=$253.00, Payment=$12.65, Unpaid Balance=$12.63, Interest Rate per Month=1.6%, Interest= , New Balance=

**Pure Math**

How to plot a steam and leaf for the following data 0 0 11 140 152 253 257 309 392 419 541 644 751 770 810 897 1295 1340 1419 1482 1515 1719 1763 1891 2005 2127 2631 2988 3686 6726 11465 12917 14701 regards

**Gen Chem II**

Thanks for the information Dr. Bob. Would you be able to work it out so that I can actually see the steps with the numbers and follow from there. The question was on Vitamin K from Sunday at 2:44pm which you answered at 3:45pm. Thanks again. I am looking to get a tutor since I...

**AP CHEM**

A secondary alcohol results from the attachment of a hydroxy group to which carbon atom? C | <---GIVEN STRUCTURE C1-C2-C3-C4 A) C1 B) C2 C)C3 D)C4 Answer is C! I have to explain why, but the teacher never taught us anything about organic chem. So please explain!

**Physics**

Two forces, 364 N at 19° and 253 N at 32° are applied to a car in an effort to accelerate it. The resultant forces of these two forces is 558.72 N. What is the direction of the resultant force (in relation to forward, with counterclockwise considered positive, with -180° &...

**Finance**

An employee makes an hourly rate plus any tips they earn. This tip employee made a total of $400 by working 28 hours last week. If $253 of their total earnings was their tips, what is their hourly rate of pay?

**Biology-squid anatomy**

Why do squids need to have three separate hearts? Since this is not my area of expertise, I searched Google under the key words "Squid anatomy hearts" to get these possible sources: http://www.thewildones.org/Curric/squid.html http://en.wikipedia.org/wiki/Squid http://72.14....

**AP Chemistry**

In a chemical atomic weight determination, the tin content of 3.7692 g of SnCl4 was found to be 1.7170 g. If the atomic weight of Chlorine is taken as 35.253, what is the determined value for the atomic weight of tin from this experiment? I already know the answer, 118.64. It ...

**Dr.Bob222 Chem**

I believe that you are correct because you have more experience in G-chem then I have. But how does doubling the reaction rate double the k value? Isn't k just a constant for a particular reaction?

**chem org**

dipole-dipole means? and diff between non polar and polar? is it really part of organic chem?

**Chem 1**

Write a chemical equation that shows how acid rain H2SO3 was produced from SO2 gas and water in a zip sealed bag? My chem. teacher never explained how to do this and I have several other questions on this type of subject. If you could help me out it would help me tremendously...