Saturday

August 2, 2014

August 2, 2014

Total # Posts: 2,696

**Chemistry**

Please help in any way that you can. Very small spherical crystals called quantum dots are being investigated for use in electronic devices. a. Calculate the mass of a quantum dot of pure silicon that has a diameter of 4nm. b. If you made a 3.5nm diameter quantum dot of pure g...

**Chemistry (How do I calculate) **

Calculate the Molar Enthalpy of Neutralization (ΔHn) in kJ/mol of the reaction between a monoprotic acid and a monoprotic base, given the following information: The temperature change equals 6.92°C, 50.0 mL of 1.00 M concentration of Acid 50.0 mL of 1.00 M concentrati...

**physics**

what is the potential energy of a 500g flag at the top of a 5.5m tall flag

**physics**

a box of mass 5.7 kg slides across a floor and comes to a complete stop. if its initial speed was 10km/h and mu = 0.34 find the acceleration of the box

**physics**

a car of mass 2000kg has a driving force of 4500N and experiences an air resistance of 1500N, What is the car's acceleration??

**How do I solve for this??**

How much heat (in Joules) is gained by the water when a chemical reaction takes place in 100.0 ml aqueous solution, has a temperature increase of 12.67°C and a specific heat capacity of 4.180 J/°Cg? [Hint: ignore any effects of the calorimeter and solve for qwater]

**Please help me solve **

How much heat (in Joules) is gained by the water when a chemical reaction takes place in 100.0 ml aqueous solution, has a temperature increase of 12.67°C and a specific heat capacity of 4.180 J/°Cg? [Hint: ignore any effects of the calorimeter and solve for qwater]

**Please help me solve **

How much heat is absorbed by the calorimeter (qcal) if the temperature is increased 12.4 °C and the calorimeter constant (Ccal) is 3.30 J/°C?

**Chemistry **

How much heat is absorbed by the calorimeter (qcal) if the temperature is increased 12.4 °C and the calorimeter constant (Ccal) is 3.30 J/°C?

**Chemistry **

How do I solve this? How much heat (in Joules) is gained by the water when a chemical reaction takes place in 100.0 ml aqueous solution, has a temperature increase of 12.67°C and a specific heat capacity of 4.180 J/°Cg? [Hint: ignore any effects of the calorimeter and ...

**Chemistry**

Sorry I forgot the rest of the equation What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.26 M silver nitrate with 150.0 m? Calculate the concentrations of each ion remaining in solution after precipitation is complete. (Enter a 0 if none of the ion...

**Chemistry **

Please please help me on this equation I'm stuck and your steps are confusing. Calculate the concentrations of each ion remaining in solution after precipitation is complete. (Enter a 0 if none of the ion remains.) Cl ‾ Ca2+ I have Ag+=0 and NO3^-3= 0.13 but I can...

**Chemistry**

I have 0.400*0.13=5.2 so far What's next? What volume of 0.300 M Na3PO4 is required to precipitate all the lead(II) ions from 130.0 mL of 0.400 M Pb(NO3)2?

**Chemistry(steps check) **

I figured out the NO3- which is 0.13, I'm stuck on the Cl- I have 0.24*2-0.0416= 0.4384 but I'm being told that's wrong What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.26 M silver nitrate with 150.0 mL of 0.24 M calcium chloride? Cl &...

**Chemistry**

What's next?

**Chemistry**

I don't understand your steps if you can type them clearly that would be great, so far I have 0.400*0.13=5.2

**Chemistry **

What volume of 0.300 M Na3PO4 is required to precipitate all the lead(II) ions from 130.0 mL of 0.400 M Pb(NO3)2? Can you please show the steps I have no idea how to solve

**Chemistry**

I have 0.400*0.13=5.2 so far

**Chemistry **

What volume of 0.300 M Na3PO4 is required to precipitate all the lead(II) ions from 130.0 mL of 0.400 M Pb(NO3)2?

**Chemistry help**

I figured out the NO3-, I'm stuck on the Cl- I have 0.24*2-0.0416= 0.4384 but I'm being told that's wrong

**Chemistry help **

What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.26 M silver nitrate with 150.0 mL of 0.24 M calcium chloride? Also, Calculate the concentrations of each ion remaining in solution after precipitation is complete. Cl ‾ NO3‾ Ca2+

**Chemistry please help **

I can't find the answer of A 0.1052 g sample of copper metal is dissolved in 55 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.5 mL. (Calculate the molarity of Cu2+.) I calculated 0.1052*63.546/6.022e23/0.2085 but webassign ...

**Chemistry(Answer check) **

A 0.1052 g sample of copper metal is dissolved in 55 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.5 mL. (Calculate the molarity of Cu2+.) 0.1052g*63.546/6.022e23 did I set it up right?

**Chemistry **

A 0.1052 g sample of copper metal is dissolved in 55 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.5 mL. (Calculate the molarity of Cu2+.)

**Chemistry **

A 230.-mL sample of a 0.280 M CaCl2 solution is left on a hot plate overnight; the following morning, the solution is 1.10 M. What volume of water evaporated from the 0.280 M CaCl2 solution?

**Chemistry **

What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.26 M silver nitrate with 150.0 mL of 0.24 M calcium chloride? Also, Calculate the concentrations of each ion remaining in solution after precipitation is complete. Cl ‾ NO3‾ Ca2+

**Chemistry **

A 0.1052 g sample of copper metal is dissolved in 55 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.5 mL. (Calculate the molarity of Cu2+.)

**Chemistry **

Please help me what is the ionic equation for AgNO3(aq) + Na3PO4(aq)? Not sure what I'm doing wrong here is what I have so far 3Na^+(aq) + PO_4^-3(aq) + 3Ag^+(aq) +3NO^3-(aq) --> 3Na^+(aq) + 3NO^3-(aq) + Ag_3PO_4(s)

**Chemistry**

I'm not sure what I'm doing wrong it still says oxidation state is improper and no the spaces do not matter

**Chemistry **

What is the complete ionic equation for NaOH(aq) + Fe(NO3)3(aq)? I'm putting this on webassign, but it's telling me "One or more of your reactants appear to have an improper oxidation state. One or more of your products contains an improper oxidation state. 3Na^+ ...

**Math **

Please please help!!!!! Solve the inequality and write the solution set in interval notation 4x^3 -6x^2<0 2x^2 (2x-3)<0 2x-3<0 x= 3/2 Now I'm not sure about this 2x^2<0 x^2<1/2 sq root of x^2<sq root of 1/2 x=.7071 Right? When I plug it in the calculator ...

**calculus **

In the computer game, there must be a ramp that is 2 m wide, with height 3 m and length. 5 m. Assume that one corner of the bottom of the ramp is at the origin.

**Employment Law (HRM300)**

I am having trouble finding Court Case Influential to Establishment of Law for: The Equal Pay Act Age Discrimination in Employment Act(1967) Civil Rights Act of 1991 Family and Medical Leave Act of 1993 Privacy Act of 1974 I have found cases that involve the above laws, but no...

**Physics**

A block of weight 30N lies on a horizontal table top. A force of 40N acts parallel to the surface of the table top, but does not cause the block to move. What is the magnitude of the frictional force between the block and the table?

**physics**

A ball is released from a tower at a height of 100 meters toward the roof of another tower that is 25 meters high. The horizontal distance between the two towers is 20 meters. With what horizontal velocity should the ball be imparted so that it lands on the rooftop of the seco...

**sports**

OK Thanks a lot Ms.Sue

**sports**

Ms.Sue is number 10 still wrong ?

**sports**

#5 Sport orginizations try to make money from "rights fees" paid by (A) A. electronic media that want to sell sport audiences to advertisers B. organized groups of spectators who seek the right to watch events C.local businesses who seek the right to sell things at s...

**sports**

if i am understanding correctly the answer would be (D) as well

**sports**

ok. they are short review questions and #4 c The Internet is different from television in that the Internet (D) A.has sites that are sponsored only by corporations. B.provides users with high quality sequential programming. C.cannot give users the same quality of sports commen...

**sports**

I don't want to have to keep posting numerous questions Ms.Sue.I don't want anyone to be mad at me for trying to get help.

**sports**

3. The legal status of most athletes in professional team sports in North America was for many years governed by the reserve system. The reserve system was designed to (C) A. give players total control over their own careers. B.increase the salaries of the best athletes on a p...

**Sociology of Sports**

Would SOMEONE PLEASE CHECK MY ANSWERS... THANKS 1. The owners of major sport teams and the sponsors of major sport events do not think alike on all issues but they generally (B) A. love sports more than their own businesses. B. agree on the need to protect their investments an...

**sports**

i am not able to post all my questions it keep saying i am not allowed to post web addresses but i am not trying to

**sports**

Has the layout of this site changed?

**Math**

A maple tree casts a shadow of 45 ft long. At the same time, a 40-ft-long oak tree casts a shadow which is 60 ft long. Explain how you can use similar triangles to find the height of the tree. Then find the height of the tree.

**math**

the angle of depresssion from the top of a building to a point on the ground is 59 degrees. how far is the point on the ground from the top of the building if the building is 87 meters high?

**Math-HELP PLEEEEAAASE**

Thank you.

**Math-HELP PLEEEEAAASE**

The volume of a cuboid is 1200cm^3, if the length is 20 cm, give two other pair of values that could be used for its width and height.

**Sociology of Sports**

# 8 IS A.

**Sociology of Sports**

Please Help these are the last of the questions I need Help with.... Which of the following is NOT one of the reasons why women are under represented in coaching and administrative positions in sports? (C) A. Men are more likely than women to be seen as qualified for these pos...

**Sociology of Sports**

Thanks Ms.Sue... I'll go with your answers...

**Sociology of Sports**

Thanks Ms.Sue, I am not to sure about 1& 2 from what i have read they seem to be the correct answers but maybe i am not comprehending it correctly. I don't know

**Sociology of Sports **

Would Someone PLEASE HELP? 1.Deviant overconformity is associated with some forms of violence in sports. The roots of this violence are grounded in (d) A. a desire for self-fulfillment and personal satisfaction. B.a lack of loyalty to team rules. C.the desire to gain reaffirma...

**Math130 HELP**

5/2=2.5 2.5+.7=3.20 2.5-.7=1.8 Compass cost $3.20 Ruler cost $1.80

**Biology**

I need help in tying 3 things from: cellular respiration, energy transfer, osmosis, ATP to the water cycle

**Macroeconomics**

If Mary takes money from her savings account and buys a T-bond from Jody with that money, it's: A. An example of expansionary monetary policy. B. An example of contractionary monetary policy. C. An example of neutral (neither expansionary nor contractionary) policy. D. The...

**physics HELP!!**

An object is moving along a straight line, and the uncertainty in its position is 2.40 m. (a) Find the minimum uncertainty in the momentum of the object. Find the minimum uncertainty in the object's velocity, assuming that the object is (b) a golf ball (mass = 0.0450 kg) a...

**physics**

An object is moving along a straight line, and the uncertainty in its position is 2.40 m. (a) Find the minimum uncertainty in the momentum of the object. Find the minimum uncertainty in the object's velocity, assuming that the object is (b) a golf ball (mass = 0.0450 kg) a...

**physics!**

Late one night on a highway, a car speeds by you and fades into the distance. Under these conditions the pupils of your eyes have diameters of about 7.0 mm. The taillights of this car are separated by a distance of 1.2 m and emit red light (wavelength = 669 nm in vacuum). How ...

**physics**

Two stars are 2.4 × 1011 m apart and are equally distant from the earth. A telescope has an objective lens with a diameter of 1.72 m and just detects these stars as separate objects. Assume that light of wavelength 590 nm is being observed. Also, assume that diffraction ...

**PHYSICS**

Two parallel slits are illuminated by light composed of two wavelengths. One wavelength is λA = 553nm. The other wavelength is λB and is unknown. On a viewing screen, the light with wavelength λA = 553nm produces its third-order bright fringe at the same place ...

**PHYSICS**

In the lungs there are tiny sacs of air, which are called alveoli. An oxygen molecule (mass = 5.30 × 10-26 kg) is trapped within a sac, and the uncertainty in its position is 0.120 mm. What is the minimum uncertainty in the velocity of this oxygen molecule?

**Math**

8943854

**math**

find the amount due on a $300 invoice recieved on june 3 and paid on june 11 if the sales terms are 3/15, n/30

**chemistry**

the density of mercury is 13.6 g/cm3. how many liters are in 829 grams of Hg.

**Life Orientation**

Hi I am a matric learner and I am having trouble with an lo portfolio assignment. it is about environmental issues and im stuck. I need to identify and describe 3 environmental health hazards that cause ill health, accidents, crisis and disasters within my community or any oth...

**Math**

List all potential rational zeros of 9x^3+6x^2-29x-10

**chemistry**

Al2(SO4)3+6KOH-->2Al(OH)3+3K2SO4 a)How many grams of potassium hydroxide are needed to completely react with 870 mg of aluminum sulfate? b)If you want to make 7.00 grams of potassium sulfate, how many grams of aluminum sulfate would you need to react? c)How many grams of al...

**Math**

A multiple choice quiz contains five question. Each question has four answer choices. Michael is not prepared for the quiz and decides to guess for each question. What is the probability that Michael will get at least one question correct? What is the probability that Micheal ...

**Eng B**

B - Weaves exciting action around a standard formula C - Contains or suggests universal truths refers to today's hot topics

**english.**

4. b

**english.**

3. d

**english.**

Is one C?

**english.**

1 D. 2 D. 3 C. 4 c.

**english. **

1. Read the following stanza from “Alone”: Lying, thinking Last night How to find my soul a home Where water is not thirsty And bread loaf is not stone I came up with one thing And I don’t believe I’m wrong That nobody, But nobody Can make it out here alone...

**Herndon High**

cos15°cos30°- sin15°sin30° =

**Algebra**

{5x-4y=-21} {-2x+4y=18}

**Math **

I can't remember how to do simplifying algebraic expressions can anyone help me?

**chemisrty**

A 21.00 sample of 0.3254M Hcl solution requires 26.09 ml of NaOH solution for complete neutralization. Calculate the volume of NaOH solution in liters, required for the titration.

**physics**

800+x-1300-400=0 800+x-1700=0 x=900

**Algebra**

Given the following piecewise function f(x)= {-x+1 for x < 0 {-1 for 0 ≤ x ≤ 3 {-2x for x > 3 a) Find the domain b) Find the range c) Find the intercepts d) Is f continuous on its domain? If not, state where f is discontinuous. e) Graph the function

**Chemistry**

Write the balanced chemical equation for reaction the following chemical reaction ozone gas , O3 , reacts with 2,3,4,5-tetramethylheptane, CH3-CH(CH3)-CH(CH3)-CH(CH3)-CH(CH3)-CH2-CH3 , to produce carbon dioxide gas, CO2 , and water vapor, H2O

**probability**

A company manufactured 1, 000 televisions. Testing showed that 20 of the televisons were defective. What is the experimental probability that the next television will be defective?

**Chemistry**

What is the equation for the reaction of potassium soap with HCL?

**Chemistry**

In saponification, does sudsing show after adding acid. Why?

**Got it right **

:0

**Calculus**

Find two positive numbers whose sum is 8 such hat when the cube of th first number is multiplied by the second number, the result is maximum.

**Chemistry**

Give the equation for the base hydrolysis of methyl benzoate by KOH. What are the 2 types of molecules being formed in this reaction?

**Chemistry**

If the molecule triglyceride underwent base hydrolysis, what 4 products would you obtain? Give the condensed formulas.

**Trig**

Solve the multiple-angle equation. (Enter your answers as a comma-separated list. Let n be any integer. Enter your response in radians.) sec 9x = 2

**Chemistry**

A balloon contains 2000mL of helium gas at 300K what is the new volume in mL at 600K

**Math**

Ok, thank you.

**Math**

x^2(3-x)=k. That's the equation.

**Math**

Given that the equation x^2(3-x) has 3 real solutions of k, give the set of possible values for k.

**anthropology**

Chiefdoms are characterized by all of the following except

**Chemistry**

How many grams of NaF should be added to 612 ml of 0.4 M HF (Ka = 6.8 x 10-4) to produce a buffer solution where pH = 3.10?

**problem solving**

ou are completing the final exam in your class. Your instructor’s assignment instructions state that you may only use the following resources: library books, class notes, texts, and the instructor. You and your roommate discussed one of the questions, but you wrote your o...

**Chemistry **

How much energy would be released when 675 grams of steam is condensed to water

**place vowlue**

2 tens and333 hundreds

Pages: <<Prev | 1 | 2 | **3** | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>