# san

Most popular questions and responses by san
1. ## Chemistry

A 0.100g sample of a compound containing C, H, and O is burned oxygen producing 0.1783 g of CO2 and 0.0734 g of H2O. Determine the empirical formula of the compound.

2. ## ua

Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

3. ## Biochemistry

Calculate the amount (in grams) of Tris Base needed to make 1L of 0.01M Tris buffer? Tris Base=121.4 g/mol

4. ## chemistry

Ammonium hydrogen phosphate, a common fertilizer, is made from reacting phosphoric acid with ammonia (NH3). If 10.00g of ammonia react, how many grams of fertilizer will be produced?

5. ## Chemistry

How many grams of PbCO3 will dissolve in 1.00L of 1.00M H+ is added to 5.00g of PbCO3?? PbCO3(s) + 2H+ (aq) -> Pb2+ (aq) + H2O (l) + CO2 (g)

6. ## chemistry

Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment,

7. ## chemistry

PCL5(g) -> PCl3(g) + Cl2 (g) Kp= 23.6 at 500K Calculate the equlibrium partial pressures of the reactants and products if the initial pressures are Ppcl5 = 0.560atm and Ppcl3 = 0.500atm.

8. ## Physics

A force of 3.0 newtons applied to an object produces a change in velocity of 12 meters per second in 0.40 second. the mass of the object is? I am not sure how to solve this problem. Formula for momentum is p= mass times velocity impulse (J) = Fnet times

9. ## chemistry

when 1.40 g of hydrated magnesium salfate is heated to constant mass, 0.68 g of the anhydrous salt remains. find the formula for the hydrated magnesium sulfate. MgSO4*xH2O ==> MgSO4 + xH2O grams water = 1.40 - 0.68 = ?? mols H2O = ??/molar mass H2O. mols

10. ## Physics

A commercial resistor can safely dissipate power only up to a certain rated value. Beyond this value, the resistor becomes excessively hot and often cracks apart. The resistor used in this experiment was rated by the manufacturer to be a 2 watt resistor.

11. ## math

A bank wonders whether omitting the annual credit card fee for customers who charge ar least \$3000 in a year will increase the amount charged on its cards. The bank makes this offer to an SRS of 400 of its customers. It then compares how much these

12. ## Economics

What is an oligopoly? A. An agreement by a formal organization of producers to coordinate prices and production B A market structure in which a few large firms dominate the market C A market structure in which two firms have a price way D a market

13. ## Biology

do you know if there are any good websites on population distrubution patterns and relevant adaptations of organisms? You need to choose a population. A species of orchids? A species of animals (kangaroo, etc)? A type of bird? A disease vector ? Make a

14. ## Chemistry

enthalpy of combustion kj mol H2 + 1/2 o2 = h20 + 286 kJ how much did you see? 62.4 ml H2 1 mol of any gas at NTP = 24.5 L You need to clarify your question. Also define NTP.

15. ## chemistry

A 1.0 g sample of food reacts with oxygen in a calorimeter containing 500 g of water. The temperature rises 10°C. What is the energy content of the food?

16. ## Physics

A hot air balloon containing an AP Physics student ascends vertically at a constant speed of 8 m/s. While ascending, he accidentally drops his rubber duckie from the gondola of the ballong. Seven seconds after it is dropped the duckie bounces off a roof at

17. ## physics

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 67.6° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 29.5 m away. By how much does the rocket clear the top of the wall?

18. ## Biosci 101

Hi there :)I was just wondering if you knew how the lac operon theory works? And if there are any good websites for this? This is the best one I could find. http://www.dartmouth.edu/~cbbc/courses/bio4/bio4-lectures/ProkGeneControl.html Most sites discuss

19. ## Chemistry

Hoffmans apparatus find out the energy available per mole of water if it is split into h2 and o2 Data 1 mol of gas at NTP is 24.5l 31.2ml of _______ 62.4ml of _______ it looks like this question comes from a lab experiment. You have not provided all the

20. ## English Essay

hello everyone...all my time spent on net surfing for if i can find some help with my HM essay....on Man to Man/Women to Women. please if someone can help out with this..i really appreciated. i m not really good on writing essay but i m looking for some

21. ## finance

The Nutrex Corporation wants to calculate its weighted average cost of capital. Its target capital structure weights are 40 percent long-term debt and 60 percent common equity. The before-tax cost of debt is estimated to be 10 percent and the company is in

22. ## physics

The temperature of 6.80 mol of an ideal monatomic gas is raised 12.0 K in an adiabatic process. What are (a) the work W done by the gas, (b) the energy transferred as heat Q, (c) the change ΔEint in internal energy of the gas, and (d) the change ΔK in

Review the business in action case studies on pp.143,.146,.154, and 159 of the text in Cpt3 select one case that you find especially interesting and explain how ethics and decision making effect the individuals involved in the scenario.

24. ## chem

how do u calulate percentage composition of NO2 [mass N/mass NO2] x 100 = %Nitrogen [mass O2/mass NO2] x 100 =%oxygen

25. ## Stats

Urn 1 contains 3 green balls and 5 white balls, and Urn 2 contains 2 green balls and 4 white balls. A ball is drawn from each urn. What is the probability that both balls are green?

26. ## chem

When a bond forms between C(H3) and MgBr, why would MgBr have a partial positive charge?

27. ## Chemistry

On top of one of the peaks in Rocky Mountain National Park the pressure of the atmosphere is 500. torr. Determine the boiling point of water at this location. The heat of vaporization of water is 40.7 kj/mol.

28. ## chemistry

what particles with electrical charges repel one another

29. ## English

I have to write and essay on similarity and difference. What are some points to writing paragraphs for the body?

Does Jiskha have Public Administration or Organizational Behavior experts available? Or. is there an expert on public sector OB and public sector finance? Not exactly. The closest is one person has a Masters in Systems Management (UnivSouthernCal).

31. ## Science/maths

what are some problems you might encounter when a)finding the volume of a rugby ball b)finding the diameter of a tennis ball c) finding the mass of a grain of sugar can you help me then I help you please w/b a) submerge it in water in a graduated container

32. ## english essay

Here is a sample outline for the essay: Introduction: Topic: male/female communication Comparison of two articles (state article names) state thesis Body: Summarize both articles Comapare and contrast both articles argue for which one is better provide

33. ## Economics

according to the law of supply the higher the price A the more consumers are willing to pay B the larger the quantity produced c the smaller the quantity produced D the more the availability of a good is reduced

34. ## Spanish

11. Si ---------- el número de mi jefe, le -------- para decirle que no puedo ir al trabajo hoy. A. sabría, llamara B.llamaría, supiera C. supiera, llamaría D.llamara, sabría My Ans: C 12. ------------ a la fiesta si ----------- encontrar un vestido

35. ## Maths

if the ratio of the length to the breadth of a rectangle be 5:3 and its perimeter is 144m, find the length of the rectangle .

36. ## chemistry

How do I draw Lewis Structure for BN and CN-

WHAT ARE the pros and cons of the following statement: “Egalitarian companies are more innovative.”

38. ## english

the term freewriting refers to?

39. ## Biology

i need to understand how draw a kite diagram. Any good websites would be helpful Thank you for using the Jiskha Homework Help Forum. Hopefully, you mean the botanical chart:

40. ## physics conclusion

im not quite sure what to write for my conclusion for this physics experiment. The aim is to record measurements and carry out calulations with the correct number of figures. We had to take a brass rod and measure its width with vernier calipers which was

41. ## english essay

Thanx alot again. Writeacher, Jenna, jk1115, for all your help thank you so much. Introduction: Topic: male/female communication Comparison of two articles (state article names) state thesis... i need help on this... What are the titles of the two

42. ## English Essay

When it comes to conversation, husband and wives often have problems that close friends of the same sex don't have. First, they may not have much to talk about, and second when they do talk. misunderstanding s often developed that lead to major fights. our

43. ## physics

A body at rest explodes into three equal parts, two parts after explosion fly off due north and west respectively with velocity 8m/s then calculate the magnitude and direction of velocity of 3rd pat.

44. ## Algebra 2

Let F(x) = -5x-4 and g(x) = 6x-7 find the f(x)+g(x) 1.-11x+3 2.x+3 3.-11x-11 4.x-11

45. ## physics

The average car today has a mass of 1100 kg, and when accelerating from rest, covers 0.25 miles in 15 seconds. Each rim and tire together has a diameter of 46 cm and a mass of 9.1kg. If we agree the rim and tire have the shape of a solid disk that rotates

46. ## PHYSICS

A SPRING WITH A CONSTANT K = 8N/m IS STRETCHED 5CM AND RELEASED. IT BOBS UP AND DOWN EVERY 2.5 SECONDS. WHAT IS ITS FREQUENCY, PERIOD, ABD AMPLITUDE

Si ---------- el número de mi jefe, le -------- para decirle que no puedo ir al trabajo hoy. sabría, llamara llamaría, supiera supiera, llamaría llamara, sabría 12. ------------ a la fiesta si ----------- encontrar un vestido apropiado para llevar. A.

48. ## fin decision making for managers

Aberdeen Corp. uses activity-based costing system with three activity cost pools. The following cost information is provided: Wages and salaries \$ 220,000 Depreciation 120,000 Utilities 100,000 Total \$440,000

49. ## Chemistry

Is it possible to calculate heat of vaporization if i only have pressure and temperature.

50. ## math

2 person in a business. first pur \$100& gets \$120 and second puts \$80 and gets \$100. Who gains more and by what percentage?

51. ## physics

why are ice packs at 0 degree better for cooling a sprained ankle than similar sized packs containing water at 0 degree? thanks Ice has much more thermal capacity to cool. Consider the heat that has to be removed at 0C to turn to ice, 80cal oer gram.

52. ## Science/maths

describe how you could make the following measurements and discuss any problems you might encounter a) finding the volume of a rugby ball b) finding the diameter of tennis ball. c) findin the mass of a grain of sugar a) submerge it in water in a graduated

1. ## Biology

There are quite a few. The four most common are: cephalosporins, macrolides, quinolones, and penicillins. However, many of these are cloned and expressed in bacterial hosts.

posted on February 9, 2016
2. ## Science

light from the sun isn't actually considered matter. It would be leaves.

posted on December 3, 2015
3. ## Science

This is actually hurting the dog so its not commensalism.

posted on December 2, 2015
4. ## biology

actually all of those disciplines do have some foundation in biology but that doesn't change my initial answer.

posted on December 2, 2015
5. ## biology

Only two of those answers have a foundation in biology and its not B. I would probably say A.

posted on December 2, 2015
6. ## Biology

A few ways, but usually as a glucose polymer stored within a vacuole of some sort.

posted on November 17, 2015
7. ## Accounting

tender price ~ 59.22/sq.m

posted on November 11, 2015
8. ## biology

The last one.

posted on November 9, 2015
9. ## Biology

Plasma membrane, perhaps. It is semi-permeable not permeable. They are essential for all living cells which includes prokaryotic and eukaryotic organisms. Selectivity due to receptors and other proteins does allow for homeostasis.

posted on October 26, 2015
10. ## Biology

It would probably be a chloroplast, although they're not only found in plants. Light-dependent reactions take place within these organelles. Although, green is reflected away so it wouldn't be the favorite color, it would be red or blue, depending on the

posted on October 26, 2015
11. ## science

There's missing information.

posted on October 26, 2015
12. ## biology

posted on September 13, 2015
13. ## biology

A community simply describes the different population of organisms within a geographic range, it does include any physical characteristics, that's an ecosystem. Think about the organisms you listed and whether you think they could be found together.

posted on September 13, 2015
14. ## Algebra

A low ha

posted on August 31, 2015
15. ## Math

Supplementary angles have a combined sum of 180 degrees. You have one value given, so......

posted on August 20, 2015
16. ## College Algebra

That's right. Did it mark it wrong because you forgot to add the base? Or a different input format?

posted on July 31, 2015
17. ## science

It's B

posted on July 27, 2015
18. ## math

What's the amount for the last one?

posted on June 15, 2015
19. ## Trigonometry

50/(tan(41)) = x

posted on June 1, 2015
20. ## Math

y=mx+b with M being your slope. What do you think the answer is?

posted on May 30, 2015
21. ## MAth

posted on May 29, 2015
22. ## Help somone!! (Technical Diffculties with Jiskha)

are you trying to post links?

posted on May 29, 2015

Without getting into much detail he would compare their genome and look for similarities that might indicate that they are closely related and perhaps belong on the same lineage or not.

posted on May 28, 2015
24. ## geometry

P=2(L+w) 28=2(2.5w+w) 28/2=3.5w 14/3.5=w w=4 I found the width for you now use that information to find the length. I also gave the formula for the perimeter of a rectangle.

posted on May 28, 2015
25. ## math

(12+18+16+17+X)/5=16 solve for x

posted on May 28, 2015
26. ## math

Where's the data?

posted on May 28, 2015

What's the question?

posted on May 28, 2015
28. ## PHYSICS

F=kx F: refers to the force applied to the spring K: the spring constant of your particular spring. X: the distance stretched Find the spring constant from the first statement of your question and use that to find the distance stretched by the 100N force.

posted on May 28, 2015
29. ## Science

They would form an ionic bond

posted on May 27, 2015
30. ## Algebra

Is there more to this? If not then: X^15*Y^5

posted on May 25, 2015

For the 3rd should be: =7x + 5 - 3y + 3x + 5 - 4y =10x -7y + 10

posted on December 17, 2014
32. ## Economics

So b?

posted on December 15, 2014
33. ## Economics

Thank you

posted on December 15, 2014
34. ## Biology

G1 checkpoint mechanism ensures that the cell is ready for cell division

posted on December 14, 2014
35. ## Chemistry

Transition metals exist in many oxidation states.

posted on December 14, 2014
36. ## Biology

yes

posted on December 14, 2014
37. ## Biology

1. wrong, eye cells are somatic, while egg cells are not. 2. correct. 3. wrong. 78 homologous pairs would equal 156 total chromosomes.

posted on December 14, 2014
38. ## physics

posted on December 14, 2014
39. ## physics

1) KE=1/2*m*v^2 (KE*2)/v^2=m 2) KE=m*v^2 use the mass we found and convert mph to m/s

posted on December 14, 2014
40. ## Biology

correct

posted on December 14, 2014
41. ## chemistry

well if the system loses heat E, delta H is - , if the system requires an input of energy delta H is +

posted on December 9, 2014
42. ## physics

posted on December 9, 2014
43. ## math

before you actually apply these equations you need to know the equivalences between the two units being analyzed

posted on December 9, 2014
44. ## math

oops y lbs * (x kg/ y lbs) = x kg

posted on December 9, 2014
45. ## Math

i don't know how you got 105. it should be 90. so, -10x=90 divide by -10

posted on December 9, 2014
46. ## math

x kg * (y lbs/ x kgs) = y lbs

posted on December 9, 2014
47. ## algebra

\$5=F \$2=T F+T=500 5F+2T=\$1450 solve for either variable on either equation and plug into equation you did not use. the rest should pretty straightforward from there

posted on December 9, 2014
48. ## science

e=mc^2 solve for m

posted on December 4, 2014