Saturday

February 6, 2016
Total # Posts: 3,002

**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*

**History**

OK is right!!! I JUST TOOK IT AND ITS 100% 4/4 RIGHT TY SO MUCH!!!
*December 22, 2013*

**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*

**algebra**

F(X)=45+5x
*December 15, 2013*

** I NEED HELP TOO!!!**

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

**Math**

Ok, now this is a question I was looking for. So, I have the answer choices, so I know what to do. A) 9 bags of sugar and 10 bags of flour. Sugar is 2 pounds. So 9X2= 18 Flour is 5 pounds, which is 10X5=50 50+18=68 That is not 48 pounds. Moving on. B) 4 bags of sugar and 8 ...
*December 10, 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*

**program planning**

Please respond to the following questions either by writing the design name or by describing the design using standard notation (X= program, O=Observation, R=random assignment. For each design, please discuss all threats to internal validity. 1. Design: Single group post-test ...
*October 26, 2013*

**Science**

Trini adds 10g of baking soda to 100g of vinegar. The mixture begins to bubble. When the bubbling stops, trini finds the mass of the resulting mixture. She determines its mass is 105g. Why has the mass changed? A. A gas has formed and left the mixture B. Vinegar evaporated ...
*October 20, 2013*

**Math (Algebra 1)**

use the cylinder formula and 3.14 time 4 times 4 times 6 then the answer to that is the answer to your problem
*October 20, 2013*

**Science**

I think it is A
*October 20, 2013*

**Science**

Which of the following is an example of how economics can affect science? A. Limited funding may lead scientists to research one topic instead of another. B. Legislators may create new laws about the use of natural resources based on the recommendations of scientists. C. A ...
*October 20, 2013*

**history**

I haven't found anything besides how women went into the armed forces and helped the country.
*October 18, 2013*

**history**

how is America's involvement in WW2 relevant to today?
*October 18, 2013*

**Science help! URGENT. Check answers**

Do your own work
*October 15, 2013*

** (History)**

What specific challenges did the South Vietnamese face as they tried to flee Vietnam in 1975?
*October 9, 2013*

**Math**

I thought Huong had to spend $3.42 because I multiplied $.03x9 and got $.27 and then I multiplied $.03x3 and got $.09. I also multiplied $.03x7 and got $.21, then I added them and got $.57. Finally I multiplied $.57x6 (by the number of sides of the box) and got $3.42. However...
*October 9, 2013*

**Reading**

64.8% Of students went to the football game are the other half was busy . Can you multiply to get the answer
*October 7, 2013*

**Math**

4600
*October 3, 2013*

**geography**

this doesn't really answer my question...
*October 1, 2013*

**geography **

what does mexico's city site on top of the aztec city suggest about the location?
*October 1, 2013*

**Geography (Ms. Sue)**

These countries are located in the western part of the continent.
*October 1, 2013*

**Health**

What is intensity?
*October 1, 2013*

**chemistry**

What is the major difference between the two-dimensional and three- dimensional models of ethane and methane? When might you choose to use a two-dimensional model rather than a three-dimensional model when representing one of the molecules?
*September 30, 2013*

**Finance**

You take out a 30 year $100000 mortgage loan with an apr of 6% and monthly payments. In 12 years you decide to sell your house and pay off the mortgage. What is the principle balance on the loan?
*September 28, 2013*

**social studies**

in 1777 who commanded the American soldiers who captured 5,800 british soldiers under general burguyne at Saratoga?
*September 25, 2013*

**chemistry**

Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 4.00-g sample is burned, and 3.30 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?
*September 22, 2013*

**Math**

The population of New York doubles during the workday. At the end of the workday, the population decreases by half. If the population in New York City is roughly 4,000,000 people before rush hour, and the morning rush hour lasts 3 hours, what would be the population if the ...
*September 21, 2013*

**business math**

You are the buyer for the shoe outlet. You are looking for a livie of mes shoes to retail for $49.95 if your objective is a 55% markup based on selling price, what is th most that you can pay for the shoes and still get the desired markup?
*September 19, 2013*

**business math**

Carousel Toys has ramper buckaroo wooden rocking horse for toodlers on a 30% markdown sale for 72.09 each what was the original price before they were markdown?
*September 19, 2013*

**business math**

The flour power bakery makes 200 cherry cheese cakes at a cost of 2.45 each. If a spoilage rate of 5% is anticipated at what price should the cakes be sold to achieve a 40% markup based on cost?
*September 19, 2013*

**business math**

Epicure market prpares fresh gourmet entrees each day. On wednesday, 80 baked chicken dinner were made at a cost of 3.50 each
*September 19, 2013*

**business math**

Whawas the orginal selling price of a trendmill curently on sale for 2,484 after a 25% markdown?
*September 19, 2013*

**BUSINESS MATH**

You are shopping for an executive desk chair at the furniture Gallery. You see two you like on sale Chair A was originally $119.99 now on sale for $ 79.99 and chairB
*September 18, 2013*

**Business Math**

Bloomingdales purchases imported perfume for $24.30 per ounce. If the store policy's to mark up all merchadise in that department 39% based on selling price, what is the retail selling price of the perfume?
*September 18, 2013*

**business math**

What is the percent markup based on selling price for the Western Wear shirts?
*September 18, 2013*

**business math**

Wyatt's western wear purchases shirts for $49.50 each. A $34.00 markup is added to the shirt. What is the selling price?
*September 18, 2013*

**math**

jim paddle from one shore of a lake three miles wide at 4 mph, and john paddles from the opposite shore at 5 mph. how long will they travel before they meet?
*September 17, 2013*

**advance icd-9**

This 35-year-old female patient has carcinoma of the upper-outer left breast. She had a lumpectomy performed and a sentinel lymph node biopsy of the axillary lymph node. The pathology report for the lymph node states no pathological change.
*September 13, 2013*

**Science**

what is a device that does work in a electrical current? A. load B. turbine C. charge D. Magnet
*September 12, 2013*

**health**

Genital HSV-1 outbreaks recur less regularly than genital HSV-2 outbreaks. The answer is c. I took this test and got it right.
*September 12, 2013*

**business math**

Arturo Muina is the captain o a charter fishing boat. He is paid a salary of $140 per day. He also averages tips amounting to 12% of a $475 daily charter rate. Last month during a fishing tournament, Arturo worked 22 days. What wre his total gross earnings for the month?
*September 8, 2013*

**business math**

Spencer Morris works in the telemarketing division for a company that pays a salary of $735 per month plus a commission of 3 1/2 of all sales greater than $15,500. If he sold $4,900 last month, what was his total gross pay?
*September 8, 2013*

**business math**

Foremost fish market pays a straight commission of 18% on gross sales, divided equally among the three employees working the counter. If foremost sole $22,350 in seafood last week, how much was each counter employee's total gross pay from this?
*September 8, 2013*

**math**

Mitch Anderson is a security guard. He earns $7.45 per hour for regular time up to 40 hours time and a half for overtime and double time f or the midnight shift. If mitch worked 56 hours last week, including 4 hours on the midnight shift, how much were his gross earnings?
*September 8, 2013*

**Math**

I'm pretty sure it goes something like: 3/5 = 3➗5 (sorry if that's a box, it's supposed to be a division sign) = 0.6 50*0.6= 30 5th grade students ________________________________________ Another way to think about it is if the denominator is the same as the...
*September 4, 2013*

**Math**

Thanks so much!!!!!! That was the only problem I had trouble on.
*September 4, 2013*

**Math**

This is Translating Problems into Equations: (a) Ms. Dixon had a 25ft ribbon that was cut into two peices. (b) One piece is 6ft longer than the other. Ms. Dixon --> Ribbon/Pieces --> Equation -->
*September 4, 2013*

**6th grade math**

They are all correct great job for not getting LCM and GCF mixed up! I used to get them mixed up all the time when I was in 6th grade.
*September 4, 2013*

**Math**

I'm not sure so maybe the numbers on the question are wrong but thanks for the help anyway.
*September 3, 2013*

**Math**

Nia and Trey both had a sore throat so their mom told them o gargle with warm salt water. -Nia mixed 12 teaspoon salt with 3 cups of water. -Trey mixed 12 teaspoons salt with 112 cups of water. Nia tasted Trey's salt water.She said," I added more salt so I expected ...
*September 3, 2013*

**physics **

a car travels 40 miles at an average speed of 80 mph and then travels 40 miles at an average speed of 40 mph. The average speed of the car for this 80 mile trip is: A) 80 mph B) 72.5 mph C) 60 mph D) 53.3 mph E) 40 mph
*September 2, 2013*

**physics **

which of the following situations are impossible : A) velocity negative, acceleration positive B) velocity positive , acceleration negative C) velocity increasing, acceleration negative D) velocity decreasing , acceleration zero E) velocity negative , acceleration negative
*September 2, 2013*

**College chemistry math ratio problem**

Earlier you determined that the proper ratio of packages of buns, packages of patties, and jars of pickles is 3:2:4. If you want to feed at least 540 people, but also maintain the proper ratio, what minimum number of packages of buns, packages of patties, and jars of pickles ...
*September 2, 2013*

**science**

wildlife
*September 2, 2013*

**business math**

Castle Mountain furniture sells desks for $346.00. If the desk cost $216.66, what is the amount of the markup?
*August 31, 2013*

**business math**

The Empire Carpet Company orders merchandise for $17,700, including $550 in shipping charges, from Mohawk Carpet Mills on May 4. Carpets valued at $1390 will be returned because they are damaaged. The terms of sales are 2/10, n30 ROG. The shipment arrives on May 26 and Empire ...
*August 25, 2013*

**Business Math**

Nature Garden Center buys lawn mowers that list for 679.95 less a 30% trade discount. What is the dollar amount of the trade discount?
*August 25, 2013*

**History **

What were the differences in kingship between France and England in the thirteenth century?
*August 18, 2013*

**math**

if there are 28 students in a class and there are 13 girls, what percentage of the class is girls?
*August 14, 2013*

**math**

a triangle has two sides with equal length and a third slide 16 meters long. if the perimeter is 42 meters what is the length of each of the equal side
*July 7, 2013*

**Chemistry**

Can you explain why?
*July 2, 2013*

**Chemistry**

The phrase “the heat absorbed or released by a system undergoing a physical or chemical change at constant pressure” is a. the change in enthalpy of the system. b. the change in internal energy of the system. c. the definition of a state function. d. the temperature ...
*July 2, 2013*

**Chemistry**

If 25.0 mLs of 0.150M nitric acid was used, how many grams of barium carbonate would be required for complete reaction?
*July 2, 2013*