Tuesday

January 27, 2015

January 27, 2015

Total # Posts: 2,740

**Chemistry**

10.1g of potassium nitrate were dissolved in 50cm^3 of water. the temperature fell by 16 degrees celsius. Determine (a) the number of moles of potassium nitrate dissolve in 50cm^3 of water. (b) heat change that would be produced if one mole of potassium Nitrate dissolve ...
*March 25, 2014*

**Chemistry**

3.25g of zinc was added to 50cm^3 of a 4.0 molar dm^-3 HCl. When the reaction was completed the temperature rose by 28 degrees celcius. (a) Is the reaction exothermic or endothermic? (b)All the zinc dissolve in this reaction. How many moles of zinc reacted? (c) How many moles ...
*March 24, 2014*

**statistics**

help i do not understand how to solve this question: assume that blood pressure readings are normally distributed with a mean of 111 and standard deviation of 7. A researcher wishes to select people for a study but wants to exclude the top and bottom 10 percent. What would be ...
*March 24, 2014*

**statistics**

assume that blood pressure readings are normally distributed with a mean of 111 and standard deviation of 7. A researcher wishes to select people for a study but wants to exclude the top and bottom 10 percent. What would be the upper and lower readings to qualify people to ...
*March 24, 2014*

**language of medicine medical billing and coding**

How does the musculoskeletal system change from birth to adulthood and what are the steps that the system goes through from childhood to adulthood to reach 206 bones?
*March 21, 2014*

**Help pleasssseee!!!**

1. Which of the following describes an example of land reclamation? A. After an area is mined for copper, the soil is replaced and new plants are planted B. After a forest is clear-cut, desertification occurs C. After a forest is clear-cut, it is mined for copper D. After an ...
*March 19, 2014*

**America history**

6. In Mesoamerica, the shift to basic crops, including corn, beans, and squash, is referred to as the _______ revolution.
*March 18, 2014*

**algebra 1**

The sum of three consecutive integers is -204 . What is the largest integer?
*March 17, 2014*

**Business Calc**

We deposit $19000 into an account earning 3% interest compounded semiannually. How many years will it take for the account to grow to $47500 ? Round to 2 decimal places.
*March 8, 2014*

**Pre-Algebra**

How do you find the surface area of a cylinder and a cone?
*March 6, 2014*

**Chemistry**

Many portable gas heaters and grills use propane, C3H8(g). Using enthalpies of formation, calculate the quantity of heat produced when 17.0g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.
*March 3, 2014*

**world history**

Your Welcome! :)
*March 3, 2014*

**world history**

Why was it built? Answer..... Shortcuts, Land transportation the entire way. Ship through the Mediterranean and off load the ship, move the goods by land to the Red Sea or Arabian Gulf and reload on a ship.
*March 3, 2014*

**math**

A sweater that reg. sold for $48 was put onsale for 33 1/3% off. what is the sale price?
*March 1, 2014*

**math**

Dylan's Bicycle Shop offers a new bicycle on sale for $259.92 after a 10% markdown. What was the cost of the bicycle to Dylan if the markup was 30% based on the cost? (Round to the nearest cent.)
*March 1, 2014*

**college busines math**

The Mills Lunch Shop prepares fresh take-out entrees each day. On Tuesday, 40 baked chicken dinners were prepared at a cost of $3.20 each. A 20% spoilage rate is anticipated. Mills Lunch Shop sells the dinners at an 80% markup based on cost. They decided to offer a $1.00-off ...
*March 1, 2014*

**Help please!!**

Oh so third?
*February 27, 2014*

**Help please!!**

Read the sentence below. Harry didn't know that his actions would affect so many people. He now regretted his choice. This is an example of ____________. A. first-person point of view<--- B. second-person point of view C. third-person point of view
*February 27, 2014*

**Help Pleasee!!**

1.Select the community activity that is a healthy choice to promote fitness for all ages A.annual 5K fun run for charity<--- B.annual state fair C.monthly movie in the park D.monthly laser light show at the planetarium 2.Mollie is well respected by her teammates even though...
*February 27, 2014*

**English**

Where can I search poverty in my community and its poverty statics for their respective areas? For instance, MN. Thank you.
*February 24, 2014*

**Social studies**

ok thanks :)
*February 21, 2014*

**Social studies**

C A D D B C D I don't think any of them are right I did the best I could.
*February 21, 2014*

**Social studies**

I have tried to answer these im just not sure help plz. 1. Which word best describes modern life for Japanese teenagers such as Asuka? relaxed crowded isolated traditional 2. Tropical storms often hit Japan during the ________. summer winter spring fall 3. Which of Japan's...
*February 21, 2014*

**history**

If you were one of the new immigrants who arrived in America in the 1880s, it's most likely that you would have been A. Italian and Catholic. B. Irish and Protestant. C. German and Lutheran. D. Swedish and Protestant. I think it's b.
*February 20, 2014*

**Math-- Check My Answers Please**

Thanks!
*February 19, 2014*

**Math-- Check My Answers Please**

Bonnie has a rectangular photographic print that is 5 inches wide and 7 inches long. If she multiplies both the length and width by 1.5, how will the perimeter of the print increase? a.) It will be 1.5 times the original size. b.) It will be 1.75 times the original size...
*February 19, 2014*

**Ap chem-Bases**

Calculate the pH of a 0.2M solution of Triethylamine, (C2H5)3N, with a Kb of 4.0x10^-4
*February 17, 2014*

**Ap chem-Bases**

Calculate the pH of a 0.2M solution of Triethylamine, (C2H5)3N, with a Kb of 4.0x10^-4
*February 16, 2014*

**Chemistry- acids/bases**

Find the concentration of OH- of a solution of 45.0mL of 0.0921 M Ba(OH)2 diluted with enough water to make 350.0 mL of solution.
*February 12, 2014*

**Chemistry- acids/bases**

Find the concentration of OH- of a solution of 45.0mL of 0.0921 M Ba(OH)2 diluted with enough water to make 350.0 mL of solution.
*February 12, 2014*

**Statistics in Psychology**

19. You measure how much people are initially attracted to a person of the opposite sex and how anxious they become during their first date. For the following ratio data, answer the questions below. Participant Attraction X Anxiety Y 1 2 8 2 6 14 3 1 5 4 3 8 5 6 10 6 9 15 7 6 ...
*February 10, 2014*

**Statistics**

A researcher measures how positive a person’s mood is and how creative he or she is, obtaining the following interval scores: Participant Mood X Creativity Y 1 10 7 2 8 6 3 9 11 4 6 4 5 5 5 6 3 7 7 7 4 8 2 5 9 4 6 10 1 4 (a) Compute the statistic that summarizes this ...
*February 10, 2014*

**Statistics**

(a) For the relationship in question 19, what is the proportion of variance accounted for? (b) What is the proportion of variance not accounted for? (c) Why or why not is this a valuable relationship?
*February 10, 2014*

**accounting**

C 3-5 years
*February 7, 2014*

**Math**

Kyle had 5/7 lb of birdseeds. Each bird feeder holds 1/5 lb of seed. Can kyle fill 5 bird feeders?
*February 5, 2014*

**Chemistry**

That makes sense! Thank you so much for your help! You really have no idea how much I appreciate it!
*February 4, 2014*

**Chemistry**

The question about the percent error and the reason for recovering more than the original mass is not asked in my lab questions. Being a math wiz, I know I did my calculations right and I even asked a fellow classmate and they too had a similar outcome. I am really just curious!
*February 4, 2014*

**Chemistry**

NaCl 36.4% SiO2 36.4% CaCO3 40.9% Percent recovery 113.7% Percent error 13.7% Original mass sample is 2.2g recovered masses NaCl 0.8g SiO2 0.8g CaCO3 0.9g total mass recovered 2.5g
*February 4, 2014*

**Chemistry**

Dr. Bob, I think youre right. I think I am over thinking this!
*February 4, 2014*

**Chemistry**

The CaCo3 and SiO2 are both solids so they remain in the filter. From there transfer it to a preweighed evaporation dish and add 3M HCl. From there we have a solid SiO2 and the supernatant liquid that we pour into a beaker and heat off to boiling and add 1M K2CO3. From there ...
*February 4, 2014*

**Chemistry**

I think I understand the SiO2 having a smaller amount present because the SiO2 most will absorb into the atmosphere due to the amounts of oxygen in the mixture to the oxygen level present in the atmosphere. I think the NaCl mass changes due to the heating process and alters ...
*February 4, 2014*

**Chemistry**

Beaker with the mixture, add distilled water, stir, pour through filered funnel= residue and filtrate filrate is boiled over a hot plate and the water boils off leaving just the NaCl
*February 4, 2014*

**Chemistry**

I did a lab the other day where we separated a mixture of NaCl, SiO2, and CaCO3. The Mixture was made by my professor and we did not know the original amounts of each compound. After recovering all of the compounds we found that there was.. 36.4% NaCl 36.4% SiO2 40.9% CaCO3 ...
*February 4, 2014*

**Math**

John has 18 coins worth $1.25. Some are nickels and dimes. How many of each does he have?
*February 3, 2014*

**Physics**

A 1.40 kg skateboard is coasting along the pavement at a speed of 5.5 m/s when a 0.800 kg cat drops from a tree vertically downward onto the skateboard. What is the speed of the skateboard-cat combination.
*February 3, 2014*

**Chemistry**

What mass in grams of a 0.500 m(molal) solution of sodium acetate, CH3CO2Na, in water would you use to obtain 0.200mol of sodium acetate?
*February 2, 2014*

**Calculus**

Find an equation of the plane. The plane that passes through (8, 0, −2)and contains the line x = 6 − 2t, y = 3 + 5t, z = 3 + 2t
*January 31, 2014*

**maths**

1 curry and 1 tea cost £4. 2 curries and 2 puddings cost £9. 1 pudding and 2 teas cost £2. What do you have to pay in total for 1 curry, 1 pudding and 1 tea? What does each item cost on its own?
*January 30, 2014*

**math**

1 curry and 1 tea cost £4. 2 curries and 2 puddings cost £9. 1 pudding and 2 teas cost £2. What do you have to pay in total for 1 curry, 1 pudding and 1 tea? What does each item cost on its own?
*January 30, 2014*

**Science ~CHECK MY WORK PLEASE~**

A scientist is trying to determine the identity of an element. It is highly reactive in water and forms an ionic bond with chlorine. It is also very shiny. The element is likely A. From Group 17 ********** B. From Group 1 C. From Group 15 D. A Noble Gas Which is most likely to...
*January 28, 2014*

**Science -CHECK MY WORK-**

Subject: The Periodic Table
*January 28, 2014*

**Science -CHECK MY WORK-**

a.) How can you describe the location of vanadium (V, atomic number 23) on the periodic table? Choose all that apply. 1. period 5, group 4 <<<My choices>>> 2. period 4, group 5 3. lanthanum series <<<My choices>>> 4. nonmetals 5. transition ...
*January 28, 2014*

**Algebra **

Systems of equation 1. +2y=5 8 -6y=3x-15 2).p-2q=4 2q=p+2 Solve the equations? I am stuck on how to do these last to problems thanks for the help
*January 26, 2014*

**Physic II**

Explain how objects can get charged by Friction.
*January 26, 2014*

**Physic II**

Explain how objects can get charged by Friction.
*January 26, 2014*

**college physics**

17.776
*January 25, 2014*

**Equation solving**

Perpendicular. To x-3y=2 and contains ( 2,4) 2). That is parallel to 2x+5y=4 I don't get how to solve and use y=Mx+b
*January 23, 2014*

**Eng**

I have to do an assignment on Ecosystems perspective and social work. I'm asked to write how they would apply the in ecosystems working with a community issue. How should I start my essay? I need ideas and issues to write and what exactly is ecosystem perspectives? Thank you!
*January 22, 2014*

**Accounting**

it is c do you need any help on anything else and my name is Jessica
*January 22, 2014*

**Math**

1. Marissa is a photographer. She sells framed photographs for $100 each and greeting cards for $5 each. The materials for each framed photograph cost $30, and the materials for each greeting card cost $2. Marissa can sell up to 8 framed photographs and 40 greeting cards each ...
*January 20, 2014*

**Chemistry**

Which of the following must be the same before and after a chemical reaction? Answer: The sum of the masses of all substances involved and the number of atoms of each type involved. WHY?
*January 17, 2014*

**Chemistry**

Assume a baker of pure water has been boiling for 30 minutes. What is in the bubbles in the boiling water? Answer: water vapor. WHY?
*January 17, 2014*

**Chemistry**

Heat is given off when hydrogen burns in air according to the equation: 2H2 + O2 ---> 2H2) What is responsible for the heat? I know the answer is froming hydrogen-oxygen bonds gives off energy, but why?
*January 17, 2014*

**Chemistry**

Iron combines with oxygen and water from the air to form rust. If an iron nail were allowed to rust completely, one should find that the rust weighs: I know the answer is the rust should way more than the nail it came from but can someone explain why please!
*January 17, 2014*

**business math**

What would be the compound amount after 19 years an investment of 42,000 with an 11% interest rate compounded annually?
*January 12, 2014*

**Pre-Algebra**

How do you solve 4x+4=9x-36? I understand that you need to get the variables alone but to I add or subtract 9x to both sides?
*January 10, 2014*

**Chemistry/Math**

so is my answer correct?
*January 8, 2014*

**Chemistry/Math**

The density of water is 1 g/cm^3. What is the mass of 7.500 liters of water reported in kilograms? I got 7.5kg. Is this correct?
*January 8, 2014*

**Health**

Pulmonary circulation transports oxygen-poor blood from the right ventricle to the ________, where blood picks up a new blood supply. A. Heart B. Lungs C. Brain D. Extremities I said A but it was wrong. I want to say B
*January 8, 2014*

**health**

Neurons carry out the functions of the nervous system by conducting ________. A. Nerve stimulation B. Nerve tissue development C. Nerve impulses D. All of the above I wanna say C, but I want to make sure I am right.
*January 8, 2014*

**math**

i need help on properties of arithmetic
*January 8, 2014*

**math**

Fran Molley is married, claims five withholding allowances, and earned 3,500 gross per month in edition to federal income tax, social security, and Medicare withholding , Fran pay 2.1% state income tax, and 1/2% for state disability insurance ( both based on her gross income...
*December 19, 2013*

**math**

Arturo Muina is the captain of a charter fishing boat. He is paid salary of 140 per day He also averages tips amounting to 12% of 475 daily charter rate. Last month during a fishing tournament, Arturo worked 22 days. What were his total gross earnings for the month?
*December 19, 2013*

**Government**

What issues do liberals and conservatives support and what constituency do they serve?
*December 18, 2013*

** I NEED HELP TOO!!!**

how did you get part a and b???
*December 12, 2013*

**Geometry **

Kelly drew four points A, B, C, and D in her notebook. A straight line joins points A and C. Another straight line joins A and B. A point D is located on the left of the line AB Kelly made the following statements about the points. Statement 1: There is at least one more point...
*December 9, 2013*

**Biology**

Can someone provide an example of positive and negative control in a very easy and simple example?
*December 4, 2013*

**Math**

the area of a yard is 420 ft. what is the probability that any leaf landing in the yard will land ina circular wading pool that has a diameter of 14 ft?
*December 4, 2013*

**Calculus**

The first boat is sailing towards the North at the speed of 6 km per hour and sees that another boat is heading east at the speed of 5 km per hour. The second boat is to the northwest of the first boat. what is the minimum distance between two boats, assuming that they do not ...
*December 3, 2013*

**Math**

2/5 is 0.4. Multiply by 100, you get 40% -> 40% of the figure is shaded. so the percentage of the figure that is not shaded is 100% - 40% = 60%
*December 3, 2013*

**health**

what does hiv stand for
*December 2, 2013*

**maths probability**

Consider an experiment with four possible outcomes which we denote by Wi for i = 1,2,3,4. Sample space is Omega = {w1,w2,w3,w4}. Consider events A= {w1}, B = {w1,w2}, C = {w1,w2,w3} and D = {w2,w4}. Given that P(A) = 1/10, P(B) = 1/2, P(C) = 7/10, compute P(D)
*November 28, 2013*

**Chemistry**

At a certain temperature, the Kp for the decomposition of H2S is 0.774. H2S(g) <---> H2(g)+S(g) Initially, only H2S is present at a pressure of 0.120 atm in a closed container. What is the total pressure in the container at equilibrium?
*November 26, 2013*

**math**

Nancy made the following statement: The range of f(x) = ax + b is the set of all real numbers given that a and b are real numbers. Which produces a counter example to her statement? b = 0 a = 0 b < 0 a < 0 i think its a=0 please help
*November 26, 2013*

**chemistry**

consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi
*November 20, 2013*

**Chemistry**

A student ran the following reaction in the laboratory at 650 K: H2(g) + I2(g) 2 HI(g) When she introduced 0.204 moles of H2(g) and 0.229 moles of I2(g) into a 1.00 Liter container, she found the equilibrium concentration of I2(g) to be 5.77E-2 M. Calculate the equilibrium ...
*November 19, 2013*

**Chemistry**

A student ran the following reaction in the laboratory at 327 K: CH4(g) + CCl4(g) 2 CH2Cl2(g) When she introduced 4.07E-2 moles of CH4(g) and 7.57E-2 moles of CCl4(g) into a 1.00 Liter container, she found the equilibrium concentration of CH2Cl2(g) to be 1.21E-2 M. Calculate ...
*November 19, 2013*

**Chemistry**

A student ran the following reaction in the laboratory at 651 K: 2 NH3(g) N2(g) + 3 H2(g) When she introduced 8.75E-2 moles of NH3(g) into a 1.00 Liter container, she found the equilibrium concentration of H2(g) to be 0.119 M. Calculate the equilibrium constant, Kc, she ...
*November 19, 2013*

**Physics**

A rifle shoots 50.0 gram bullet with a muzzle a velocity of 350 m/s. How fast would a 80.0 kg person have to run in order to have the same amount of kinetic energy as the bullet in flight? If the bullet is shot vertically, what is the the maximum height about the gun barrel ...
*November 19, 2013*

**Physics**

A 1000 kg car is going 8.90 m/s has a minimum braking distance of 6.0 meters. Find the average braking force exerted on the car during the stopping process.
*November 19, 2013*

**english-project**

Hi!I am doing project, its about making the world a better place for humans. I have to join organizations online and subscribe t email lists to get action updates-issues like anti-war/peace, social justice and environments, animals, food water and democracy. Please tell me ...
*November 12, 2013*

**chemistry **

MASS (GRAMS) Nac1- 0.9992 C12H22O11- 0.9822 NH4C1- 0.9510 C6H5OH- 0.9723 C9H20- 1.0038 *Find the Molar Mass (g/mol) for each * *Find the Moles of each element for each * *Find the Atoms of each element for each * - if possible show work and or equation set up to find answers
*November 8, 2013*

**Psychology**

Please Help
*November 6, 2013*

**Psychology**

Which of the following variables are independent and dependent? 1. Personality and Gender 2. Happiness 3. Scores
*November 6, 2013*

**Math/Infinity**

Explain why the union of two countably infinite sets with nothing in common is also countably infinite. I said that it was because the two sets are in one-to-one correspondence with each other. Is this right?
*October 31, 2013*

**Thomas Nelson**

Check out definr (dot) com just type in chromatin and see what comes up
*October 31, 2013*

**english**

What literary work is this from? You will need to post the lines in order for people to understand your question.
*October 31, 2013*

**physics **

A projectile launched straight upward at 141 m/s. How fast is it moving at the top of its trajectory? Suppose it is launched upward at 45° above the horizontal plane. How fast is it moving at the top of its curved trajectory?
*October 31, 2013*

**Math/Infinity**

Split the natural numbers into three sets A, B, and C so that the sets have nothing in common, they each are countably infinite, and A U B U C = the set of natural numbers. So here's what I got A: 2,4,6,8,10... B:1,3,5,7,9... C: ? I don't know what to do for C because ...
*October 30, 2013*

**Chemistry**

When the stopper of the Erlenmeyer flask is loosened before weighing, why doesn't the carbon dioxide escape? Why isn't the mass of air displaced by the water taken into account when the the mass of water is determined?
*October 27, 2013*

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