Sunday

December 21, 2014

December 21, 2014

Total # Posts: 263

**Chemistry**

According to his prelaboratory theoretical yield calculations, a student's experiment should have produced 1.41 g of magnesium oxide. When he weighed his product after reaction, only 1.33 g of magnesium oxide was present. What is the student's percent yield?
*December 6, 2014*

**chemistry**

Can somebody please answer my question.
*December 6, 2014*

**Chemistry**

'calculate the mass in amu of 2.879 1023 xenon atoms'
*December 6, 2014*

**Chemistry**

Merchants usually sell small nuts, washers, and bolts by weight (like jelly beans!) rather than by individually counting the items. Suppose a particular type of washer weighs 0.128 g on the average. What would 130. such washers weigh?
*December 5, 2014*

**Chemistry**

What volume will 823 mL of SO3 gas at 11 degrees celsius and 720 mm Hg occupy when the pressure is raised to 1.55atm and the temperature is raised to 81 degrees celsius?
*November 23, 2014*

**Chemistry**

A volume of 725 mL of a gas is collected at 105 degrees celcius and 746 torr. The gas sample wights 1.92 grams. What is this gas?
*November 22, 2014*

**Chemistry**

It takes 37.16 mL of 0.510 M HCL to neutralize 25.00 mL of NaOh. What is the concentration of the NaOH?
*November 22, 2014*

**chemistry**

2.9 in3 of mercury to its volume in milliliters and its mass in kilograms
*November 12, 2014*

**chemistry**

263 mL ethanol to its mass in grams
*November 12, 2014*

**Chemistry**

Figured that one out. Thank you
*November 12, 2014*

**Chemistry**

Iron has density 7.87 g/cm3. If 52.3 g of iron is added to 74.5 mL of water in a graduated cylinder, to what volume reading will the water level in the cylinder rise? mL
*November 12, 2014*

**chemistry**

Thank you Dr. Bob
*November 12, 2014*

**chemistry**

28.09 g of silicon contains 6.02 1023 silicon atoms. What is the mass in grams of 1.06 1025 silicon atoms? Can you help me please.
*November 12, 2014*

**Chemistry**

28.09 g of silicon contains 6.02 1023 silicon atoms. What is the mass in grams of 1.06 1025 silicon atoms?
*November 12, 2014*

**Chemistry**

Thank you
*November 8, 2014*

**Chemistry**

What would be the molarity of a solution made by dissolving 126g K3PO4 into 1500 mL of water?
*November 8, 2014*

**chemistry**

Is this correct? 3.84 mol(2 H2O/7.68)????
*October 27, 2014*

**chemistry**

Find the mass of water (H2O) needed to react with 150 grams of potassium (K) 2K(s) + 2 H2O (g)-2KOH +H2(g) How do I get the number of moles in H2O? Desperate to understand this. I got K= 150g./39.0983=3.84 mols of K. Then would it be 3.84(2mols H2O/7.68) How do I get the ...
*October 27, 2014*

**Chemistry**

Find the mass of water (H2O) needed to react with 150 grams of potassium (K) 2K(s) + 2 H2O (g)-2KOH +H2(g) How do I get the number of moles in H2O? Desperate to understand this. I got K= 150g./39.0983=3.84 mols of K. Then would it be 3.84(2mols H2O/7.68) How do I get the ...
*October 27, 2014*

**chemistry**

Find the mass of water (H2O) needed to react with 150 grams of potassium (K) 2K(s) + 2 H2O (g)-2KOH +H2(g) How do I get the number of moles in H2O? Desperate to understand this. I got K= 150g./39.0983=3.84 mols of K. Then would it be 3.84(2mols H2O/7.68) How do I get the ...
*October 27, 2014*

**chemistry**

Find the mass of water (H2O) needed to react with 150 grams of potassium (K) 2K(s) + 2 H2O (g)-2KOH +H2(g) How do I get the number of moles in H2O?
*October 27, 2014*

**chemistry**

How do I get the number of moles of H2O
*October 27, 2014*

**chemistry**

find the mass of water(H2O) needed to react with 150 grams of potassium(K)
*October 27, 2014*

**chemistry**

1/10^-8 in scientific notation
*October 27, 2014*

**chemistry**

1/10^-8 in scientific notation. I need help please.
*October 27, 2014*

**chemistry**

1/0.000015 in scientific notation. Please explain how to do this.
*October 27, 2014*

**Chemistry**

1/10e-8 in scientific notation. How do I solve this please.
*October 27, 2014*

**Chemistry**

If 525J of energy are added to a 75.5g piece of iron at 22.2 degrees celcius what is the final temperature?
*October 27, 2014*

**Chemistry**

Never mind. I got it.
*October 27, 2014*

**Chemistry**

How much energy is required to raise the temperature of a 34.4g Al bar from 20.0 to 35.5 degrees celcius?
*October 27, 2014*

**Chemistry**

How many atoms of nitrogen are in 3.00g of N2O5?
*October 27, 2014*

**Pharmacy Tech**

15gr of potassium chloride is diluted in 2 L of sterile water for injection. What is the final percent strength?
*October 9, 2014*

**world issues**

Imagine that you are advising President Obama as he develops his address to the nation on ISIS, what specific actions would you advise him to include in his strategy to deal with the ISIS crisis? (Based on the article: U.S. Weighs Direct Military Action Against ISIS in Syria) ...
*September 9, 2014*

**math**

find the height in feet of a ball after 6 seconds in the air. after one second the ball is 148 feet in the air; after 2 seconds it is 272 feet in the air
*June 16, 2014*

**math**

this investment require table factors for periods beyond the table. create the new table factor AND the present value for $100,000 (compound amount) for 50 years at a nominal rate of 5 percent with interest compounded annually thanks
*May 15, 2014*

**math**

what is the maturity value of $20.000 investment with the rate of 6 percent for a term of 15 years
*May 15, 2014*

**math**

the following investments require table factors for periods beyond the table, create the new table factors AND present value $31,000 (compound amount) time period is 50 years nominal rate is 5% and interest compounded annually thanks
*May 14, 2014*

**math**

calculate the present value (principal) and compound interest on $900 (term of investment 1.75 years ) rate of 18% compounded monthly
*May 14, 2014*

**math**

for the month of january, an engine parts supplier company had the following financial information: merchandise inventory, january 1, $322,000, merchandise inventory january 31 $316,400, grooss purchases, $243,460, purchase returns and allowances $26,880 and frieght in $3,430 ...
*May 14, 2014*

**math**

what was the interest rate on the loan for $50,000 if the interest amounted to $4500 for 9 months
*May 14, 2014*

**math**

the fabric mart had cost of goods sold at $844,000 for the year.the beginning inventory at cost was $305,500, and the ending inventory at cost amounted to $414,200. the inventory turn-over rate published as the industry standard for a business of this size is five times...what...
*May 8, 2014*

**math**

The fabric mart had costs of goods sold at $844,000 for the year
*May 7, 2014*

**Medical billing and coding**

research project APA style, regarding:P POA indicator questions. I want to know if I need to post the questions, and then answer them, or do I just use the format for numbers and than answer. I have never done APA style, and this is really puzzling me. Thank you for your help...
*April 30, 2014*

**math**

what percent is 6,944.85 of 154,330.00
*April 30, 2014*

**math**

what is 4.5 % of $154,330.00
*April 30, 2014*

**math**

calculate compound interest (quarterly )earned in a year for $1000.00 with a nominal rate of 8%...(APY) ? THANKS
*April 24, 2014*

**math**

find compound and (apy) amount for $1000.00 with a 12% nominal rate (quarterly).determine how many days of loan thanks
*April 24, 2014*

**math**

calculate the present value AND the compound interest for this investment, round to the nearest cent...$20.000 with a nominal rate of 14% for 30 months ( semiannually)
*April 24, 2014*

**math**

create a new table factor and calculate the compound amount for $10.000 with a nominal rate of 6% for 4 years
*April 24, 2014*

**Early Childhood**

Mrs. Bates watched David work a puzzle that he had chosen from the ones she put on the table. She listened and commented when David made guesses at the correct location for the pieces. This is an example of a/an __________ activity. A. structured B. unstructured C. child-...
*March 12, 2014*

**Alegbra**

-8 3.4x 10
*March 12, 2014*

**Language Arts**

homes
*March 12, 2014*

**Algebra**

Needing help, Please.. Robert needs to fill up a box with packaging material. Use the picture below to calculate the volume of the box. (2x+3)length (x-3)height (x+2)width
*March 5, 2014*

**Algebra**

Robert needs to fill up a box with packaging material. Use the picture below to calculate the volume of the box. Length (2x+3) Width (x+2) Height (x-3)
*March 4, 2014*

**math**

Two numbers have a product of 3 and 1/5 and a sum of 3 and 3/5 what are the numbers
*February 28, 2014*

**Algebra**

Victoria wants to plant a vegetable garden in the shape of a square. She has a space allocated in her backyard that will accommodate 175 square feet. Using the drawing below, use the FOIL method to find the polynomial that represents the area of the square. If x=6, will she ...
*February 25, 2014*

**Math**

Victoria wants to plant a vegetable garden in the shape of a square. She has a space allocated in her backyard that will accommodate 175 square feet. Using the drawing below, use the FOIL method to find the polynomial that represents the area of the square. If x=6, will she ...
*February 25, 2014*

**Math**

John wants to hire an editor to check his thesis paper. The editor charges a flat rate of $50 and $2 per page. Write a polynomial to describe the cost. Find the cost of editing 75 pages. Calculations: Answer: Polynomial: ____________________Cost:_________________
*February 24, 2014*

**Math**

A party planner can spend a maximum of $5000 on food. If the chicken dinner (x) costs $20 and the steak dinner (y) costs $25, make a graph of the region that shows the possibilities for the number of chicken and steak dinners that can be purchased while still staying within ...
*February 18, 2014*

**Math**

3/7= 0.428 liters each or 428 mililiters each
*January 13, 2014*

**Penn Foster**

@Writeacher I think she already did that, it's says (my choice) after the answers :D
*January 13, 2014*

**physics I'M STUCK PZL HELP**

because they ask you for half of the time, so in your case in 145 it gets burned 5% in 145 seconds
*December 8, 2013*

**physics I'M STUCK PZL HELP**

p: percentage (4.5% is burned in 155s) m:mass of rocket u:fuelspeed in meter/s! v=u*ln(1/(1-p))=1500*ln(1/0.955) a=v/t = 69.065/155= 0.4455
*December 8, 2013*

**physics I'M STUCK PZL HELP**

Me too!!!
*December 8, 2013*

**physics(URGENT!!!!!)**

it doesnt matter if the wind blows, so its the same frequency. In your case 450.
*December 8, 2013*

**Physics Classical Mechanics**

A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= ...
*December 8, 2013*

**Business Math and Statistics**

You deposit $1,000 for 4 years at an interest rate of 2.0%. If the interest is compounded annually, how much money do you have after 4 years?
*December 8, 2013*

**Math**

if takes bob 40 mins to type 6 pages how many pages can bob take type in 2.5 hours
*November 19, 2013*

**canadian history**

thank you!
*November 12, 2013*

**canadian history**

i meant hbc*
*November 12, 2013*

**canadian history**

i don't know. they hunted, worked for the h&c and nwc and lived along the river but thats all i know. i need enough to present to a class
*November 12, 2013*

**canadian history**

what was the way of life or lifestyle like for fur traders and settlers at red river? how is it different from our lifestyles today?
*November 12, 2013*

**emt**

I have to do a project on medical shock do you have any ideas, I need a good grade on this.
*October 13, 2013*

**physics**

How much heat ( In calories)is needed to warm 200 grams of water from an initial temperature of 24 degrees celsits to a final temperature of 84 degrees celsuis
*September 24, 2013*

**Information Literacy**

11. Which of the following sets of Library of Congress call numbers is in the correct order? A. E88 G62 L166 1995, E88 G62 L45, E88 G62 D225, E88 G2512 S57 1998 B. E88 G2512 S57 1998, E88 G62 D225, E88 G62 L166 1995, E88 G62 L45 C. E88 G2512 S57 1998, E88 G62 D225, E88 G62 ...
*May 21, 2013*

**Math**

Find the z-scores that bound the middle 55% of the standard normal distribution ____ small value _____ larger value
*May 11, 2013*

**Math**

Find the z-scores that bound the middle 55% of the standard normal distribution ____ small value _____ larger value
*May 11, 2013*

**Chemistry**

Net Ionic Equation for reaction between bromide and silver nitrate
*April 22, 2013*

**math**

how to solve this problem ln(x-4)=-3
*April 12, 2013*

**Economics**

Suppose two passengers end up with a reservation to Los Angeles. Two alternatives are proposed: a. Toss a coin b. Sell the ticket to the highest bidder Compare the two options from the standpoint of efficiency and equity.
*March 17, 2013*

**Math 208**

Rectangle Dimensions: The length of a rectangle is 7 inches longer than the width. If the perimeter of the rectangle is 62 inches, find the measures of the length and width.
*March 3, 2013*

**math**

Lumberjacks had 30 acres to clear.they cleared 5 acres a day. How many days did it take to clear the trees from the acre?
*February 20, 2013*

**edu- Home, school and community**

If you are using the Home, school and community book. The answer is in chapter 6 on page 195 top page. The answer is; D. "detached concern" I suggest careful reading.
*January 31, 2013*

**English**

What type of analogy is garbage:smelly and antenna:radio?
*January 16, 2013*

**math**

express 16^21/2^7 - 5^12 in simplest fotm
*January 16, 2013*

**physics **

a 1.00 x 10 W electric motor is used to life a 955 kg object vertically 25.0 m at a constant velocity. How much time does it take to lift the object.
*December 2, 2012*

**grammar**

2. the basket's handle 5. The walruses' tusks. 9. The thieves' plan. Everything else you have correct.
*November 13, 2012*

**Chemistry**

25.00 mL of heavy water (D2O where D is a hydrogen with a neutron in its nucleus) at 20 degrees C was pipetted into a 37.234 g beaker. The final mass of the beaker was 64.859 9 a- what is the density of heavy water at 20 degrees C b-The density of normal water (the hydrogens ...
*September 20, 2012*

**college algebra**

x^4+2x^2-15=0
*September 18, 2012*

**chemistry**

You are given 28.0 of aluminum and 33.0 of chlorine gas. Part A If you had excess chlorine, how many moles ofof aluminum chloride could be produced from 28.0 of aluminum?
*September 17, 2012*

**Geodetic Survey**

a surveyor is trying to determine the change in hight h from the bottom to the top of a hill. If the height of instrument H is 4.5 ft the height of the object that he sights on the tower A is 6.5 ft and the zenith angle Z is 54deg 16' 25" determine the height of H (...
*September 14, 2012*

**HCS/451**

What criteria should Healthcare organizations use to prioritize regulartory requirements. I just need to find information on this part of the DQ.
*September 6, 2012*

**Physics**

Forcefriction=(Psin37+15*9.8)*.70 So Pcos37 must equal to the force, solve for P. how to get the magnitude of P??how to solve for P. thanks a lot~~
*August 26, 2012*

**Physics**

A 15 kg box sits on a horizontal force. the coefficient of static fricition between the box and the surface is 0.70. if a force P is exerted on the box at an angle directed 37 degrees below the horizontal, what must be the magnitude of P to get the box moving??
*August 26, 2012*

**math**

solve -6x+5+5=47 x=
*August 5, 2012*

**Algebra**

-6x+5=47 x
*August 5, 2012*

**algebra**

add simply or fraction 5 3 4 ------ + -- + --- = 8 20 15
*July 30, 2012*

**Physics please help.**

At 265 K, the pressure of 0.0454 mol of an ideal gas is 1.42×105 Pa. What volume does the gas occupy? Please help!
*June 22, 2012*

**Physics help**

At 265 K, the pressure of 0.0454 mol of an ideal gas is 1.42×105 Pa. What volume does the gas occupy?
*June 21, 2012*

**English**

Romeo and Juliet
*May 8, 2012*