Friday

December 19, 2014

December 19, 2014

Total # Posts: 942

**chemistry. please help drbob222**

One of the reactions involved in the smelting of copper sulfide ores involves copper (I) oxide and copper (I) sulfide: 2Cu2O2 + Cu2S ---> 6Cu + SO2 Assuming that 35.00 g of copper (I) oxide is heated with 25.00 g of copper (I) sulfide A) determine which reagent is present ...
*December 7, 2014*

**chemistry check if my answers are right. drbobzz**

I also have another chemistry question that i am stuck on.
*December 7, 2014*

**chemistry check if my answers are right. drbobzz**

So A would be 147.5 and C) 33.22
*December 7, 2014*

**chemistry check if my answers are right. drbobzz**

A) mass of O2 = (48.0 C2H2/26.04 g/mol)(5O2/2C2H2)(16.00 g/mol) = 73.7 g of oxygen C) mass of H2O = (48.0 g C2H2/26.04 g/mol)(2H2O/2C2H2)(18.02 g/mol) = 14.8 g of water
*December 7, 2014*

**chemistry check if my answers are right. drbobzz**

Acetylene gas(c2h2) is used in welding. During one job a welder burns 48.0 g of acetylene. Using a balanced equation for the complete combustion of acetylene calculate the following. Equation 2C2H2 + 5O2 ---> 4CO2 + 2H2O A) the mass of oxygen used B) the mass of carbon ...
*December 7, 2014*

**chemistry **

Acettlene gas (C2H2) is used in welding. During one job, a welder burns 48.0 g of acetylene. Using a balanced equation for the complete combustion of acetylene, calculate the following: Balanced Equation a) the mass of oxygen used b) the mass if carbon dioxide produced c) the ...
*December 6, 2014*

**Chemistry**

CuSO4.xH2O Determine the percent by mass of water in your sample of hydrated copper (II) sulfate. Show your calculations clearly. My work. i got 10% is that correct
*December 1, 2014*

**physics**

The temperature of the air is 20.0 degrees Celsius when a tourist drops a coin into a wishing well. She hears the splash 5.30 s after drops the coin. If air resistance is ignored, how deep is the well?
*November 29, 2014*

**Physics**

so is the answer D correct?
*November 28, 2014*

**Physics**

Which wave of the following wavelengths could not make a standing wave in a 1.0 m string, with nodes at both ends? A. 2.0 m B. 1.0 m C. 0.75 m D. 0.50 m E. 0.25 m i think the answer is D
*November 28, 2014*

**Physics**

ok thank so much! it makes senses
*November 28, 2014*

**Maths**

Jake mixes pineapple, orange and lemonade in the ratio of 1:2:4. If he has 3 parts pineapple, how much orange and lemonade does he need?
*November 25, 2014*

**biology**

Are Lilac flowers vascular or non vascular
*November 22, 2014*

**Biology**

Is a Lilac Flower: a) Vascular or non-vascular b) Gymnosperm or angiosperm c) Monocot or a dicot My Work i know c) is dicot but i am not sure of the other two
*November 20, 2014*

**Physics**

A woman on a bicycle traveling at 10m/s on a horizontal road stops pedaling as she starts up a hill inclined at an angle of 10° to the horizontal. How far up the hill does she travel before coming to rest? I really don't understand this question. Please help!
*November 19, 2014*

**Physics **

A meteorite weighing 1860N strikes the earth with a velocity of 45.2m/s. What is its kinetic energy? Write in SN to one decimal place. When I plugged in (1/2)(1860N)(45.2m/s)^2, I got the answer 1.9e6, but it was incorrect. Please help. I'm really confused!
*November 19, 2014*

**Algebra please help out**

Two games went a total of32 mins one goes 12mins longer than the other .use letter to represent the unknown. Solve the problem
*November 19, 2014*

**Physics **

Calculate the power needed from the motor of an elevator for it to be able to lift a 1x10^4kg mass a distance of 20m in 5s. (Enter your answer in scientific notation utilizing "e" format and rounding the decimal value to one decimal place.) I used the equation p = w/...
*November 19, 2014*

**arithmetic**

How do I solve 15x=75?
*November 16, 2014*

**arithmetic**

How do I solve .15x=75
*November 16, 2014*

**arithmetic**

If you spent 85% of your money and have only $75.00 left, how much money did you start with?
*November 16, 2014*

**machnics**

The equations of motion are derived from the indefinite integral of acceleration.verify
*November 6, 2014*

**Astronomy**

How much does the luminosity of a spherical source of blackbody radiation increase if you triple its size?
*November 3, 2014*

**Astronomy**

If some external force were able to compress the sun, how would the sun react and why?
*November 3, 2014*

**chemistry**

I dont understand
*November 2, 2014*

**chemistry **

Complete and balance the following reactions, where applicable. If no reaction occurs, write N.R. Li + H2O ----> KCI + F2 ---> Au + HNO3 ---> CI2 + NaF ----> Li + Fe(NO3)3 --->
*November 2, 2014*

**Physics**

Three children are fighting over a toy. One child pulls on the toy with a force of 100N at an angle of 37° north of east. The second child pulls on the toy with a force of 200N south. The third child pulls with a force of 250N at an angle of 20° south of west. Watching...
*October 31, 2014*

**Physics**

A satellite orbits a planet at 4000m/s, and the acceleration of gravity (centripetal acceleration) on the satellite is 0.58m/s2. What is the diameter of the orbit of the satellite? (Enter your answer in scientific notation utilizing "e" format and rounding the ...
*October 31, 2014*

**Physics**

A cord 0.65m long exerts a centripetal force of 23N on a whirling 2kg mass tied to the end of the cord. What is the velocity of the whirling mass? Round to nearest tenth. For this problem, I used to formula V = square root of f/rm. I did the square root of 23/0.65(2) = 8.4m/s^...
*October 31, 2014*

**MATH ASAP**

2.)D-about 20 3.) A- about 48 4.) A- about 8 5.) C- 3 modes What number is underlined on #1?
*October 30, 2014*

**Biology**

A couple has a child with an autosomal recessive form of glycogen storage disease, a deficiency of a lysosomal enzyme. An enlarged liver and heart and weak muscles cause the baby to die from heart and lung failure at 20 months. Now the woman is pregnant again. Her doctor ...
*October 21, 2014*

**Algebra HELP!**

The student bookstore had a textbook for sale at $89.95. A student found the textbook on eBay for $62.00. If the student bought the book on eBay, what percentage of the cost of the bookstore book did she save?
*October 21, 2014*

**Algebra, help please!!!**

Solve for x in each of the following: a: 2/3x = 11/6 b: 3/4 / x = 1/3 c: 5/6 - 2/3x = 3/4 d: 2x/3 + 1/4 = x/6 - 1/2 Please help me and explain, I don't get fractions at all!
*October 11, 2014*

**statistics**

The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 42 and a standard deviation of 10. Using the empirical rule (as ...
*October 8, 2014*

**Chemistry**

Naturally occurring copper is a mixture of two isotopes. One of these has 34 neutrons the other has 36. If the relative atomic mass of copper is 63.55 amu calculate the natural abundances (percentages ) of the two isotopes.
*October 5, 2014*

**Algebra**

Find the first five terms of the sequence whose nth term is given. a: (-2)n + 2n b: n squared(-1)n c: |10-n squared|
*October 1, 2014*

**Microbiology**

What is the preferred method of sterilization for heat-sensitive solution? In addition, note a heat-sensitive solution that can be sterilized using the method you noted. a. Preferred method: b. Example:
*September 26, 2014*

**Microbiology**

How would you disinfectant a plastic chair surface contaminated with blood in the hospital? (Please note in detail the steps required for personal protection, initial clean-up, follow-up disinfection, and the disposal methods of contaminated items) a. Personal protection ...
*September 26, 2014*

**Microbiology**

Explain why regular hand soaps are good de-germing agents but poor antimicrobial agents
*September 26, 2014*

**Microbiology**

If you are formulating a new chemical disinfectant for bacterial control in the home, note two factors that you would take into consideration when designing this disinfectant. a. b.
*September 26, 2014*

**Microbiology**

A patient with an active case of Mycobacterium tuberculosis (TB) was treated and released from the hospital. You are responsible to oversee the decontamination of the patient’s room. Explain why is it a concern if the beside roll-away table has dried-up sputum on it from ...
*September 26, 2014*

**Microbiology**

Name a pathogenic bacterium (provide genus and species names) and the disease caused in humans that is typically spread by healthcare professionals in a healthcare facility due to improper techniques. In your explanation, provide an example how this bacterium could be spread ...
*September 26, 2014*

**Microbiology**

How would you disinfectant a plastic chair surface contaminated with blood in the hospital? (Please note in detail the steps required for personal protection, initial clean-up, follow-up disinfection, and the disposal methods of contaminated items.) a. Personal protection ...
*September 26, 2014*

**Microbiology**

What methods would you use to sterilize and clean a lab coat contaminated with a broth culture of Vibrio cholerae so that the lab coat could be safely used again? a. Method of sterilization: b. Method of cleaning: c. Name which method would be implemented first:
*September 26, 2014*

**Microbiology**

Name a pathogenic endospore-forming bacterium (provide genus and species names) which can be associated with improperly canned beans. Note what method is used to process canned beans. If the canned beans are not properly processed and these pathogenic endospore-forming ...
*September 26, 2014*

**Science**

An object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?¿???????????????
*September 23, 2014*

**Economic**

The Admissions Director (AD) wants to determine the optimum number of students for each ECO561 class. You are provided with the following data: Tuition is $1250 per student. Instructor Pay $2500 Other incidental (variable) costs - $1000.00 Variable cost increases by 10% per ...
*September 23, 2014*

**math**

Simone rents a compact car that gets 31 miles per gallon. When she rents the car, the price of a gallon of gas is $3.10. The cost C of the gas used to drive the car is a function of the number of miles x that the car is driven. The cost of renting the car is $0.10 per mile ...
*September 15, 2014*

**Grade 11 Physics**

Average speed: Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 kilometres away. It takes Amy 40 mins to arrive at school. Bill arrives 20 mins after Amy. How much faster(in meters/second) is Amy's average speed for the entire trip?
*September 2, 2014*

**physics**

calculate the amount of heat energy required to melt a 1kg iron ingot initially at 20 ¡ãC? (heat of fusion for Fe is 33.0 J/g
*August 4, 2014*

**chemistry**

Describe how the structure of polyethylene impacts its function in terms of chemical bonding and intermolecular forces
*July 5, 2014*

**Spanish**

Thanks soo much!!! btw i forgot to write my name but any ways thanks again^__^
*May 21, 2014*

**Spanish**

Thanks i really need this help.
*May 21, 2014*

**Spanish **

Spanish Help Me Plz!!^__^ _________ 1. La Marcha _________ 2. La Cruz de Guía _________ 3. La Bulla _________ 4. Los Nazarenos _________ 5. El Paso del Cristo _________ 6. Los Penitentes _________ 7. El Paso Palio a. crowds of people b. the members of the fraternity, ...
*May 21, 2014*

**math**

a plane leaves Vancouver headed for Toronto of a speed of 700 km/hr. Half an hour later a planes leaves toronto headed to vancouver travelling at a spped of 750 km/hr. the distance between vancouver and toronto is 3420 kn. How long after the plane leaves vancouver will it pass...
*April 30, 2014*

**math**

how much is 8 liters jug water he fills 9750 millimeters pitchers with water how much water is left?
*April 23, 2014*

**geometry**

3 times the complement of an angle is 30 more than the supplement of the original angle. What is the measure of the angle?
*April 23, 2014*

**Physics **

f a 40 kg weight and a 200 kg weight each dropped from 1 m above the trampoline, find the final position of each weight. Assume the trampoline is a simple spring obeying Hooke's law with a k value of 12 000 N/m. I was able to get the answer to this, using mg(h+x) = 1/2kx^x...
*April 18, 2014*

**English grammar**

Thanks
*April 11, 2014*

**English grammar**

Who can give me a good explanation with examples for the following conjunction. a) while b) unless
*April 11, 2014*

**math**

if 10 of the 50 pieces if candy are green, then what percent of the pieces of candy are green?
*March 25, 2014*

**math**

Rachel , smith , john and Thomas brought in 300 pennies for the penny harvest . Smith brought in 2/6 of the pennies . Rachel brought 1/5 and Thomas brought 1/4 of the pennies. How many pennies did john bring in?
*March 24, 2014*

**trigonometry**

a clock has a dial face of 12 inches radius the minute hand is 9 inches while the hour hand is 6 inches the plane of rotation of the hour hand is 2 inches above the plane of rotation of the minute hand. Find the distance between the tips of the minute and hour hand at 5:40 am.
*March 18, 2014*

**math**

please solve 100 divided by 5 to the 2nd power times 4 to the 3rd power.
*March 16, 2014*

**math**

Andrew wants supplement his pension with investment interest if he invests 28,000 at 6% interest how much would he have to invest a t 7% to achieve the goal of 3,000 per year in supplemental income.
*March 2, 2014*

**help-3 questions**

Thanks! This helps SO much!
*January 22, 2014*

**math**

the first term of a geometic sequence is 3 and the sum of second and third terms is 60 determine the first three terms and the general terms tn.
*January 21, 2014*

**math**

show that x(-4,-3) and y(4,3) are endpoints of a diameter of the circle x^2 + y^2 = 25
*January 3, 2014*

**pre calculus**

2k^2+5k-9
*December 10, 2013*

**pre calculus**

2k^2+5k-9=0
*December 10, 2013*

**pre calculus**

x^2-3x-7=0
*December 10, 2013*

**pre calculus**

x^2-3/4x+1/8=0
*December 10, 2013*

**pre calculus**

2x^2+11x-21=0
*December 10, 2013*

**chemistry**

Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas
*December 4, 2013*

**social studies**

how did poverty affect the aboriginal in canada in last 500 hundred years ?
*November 28, 2013*

**us history**

did the federalist support a strong or weak federal government????
*November 13, 2013*

**math**

I don't know
*November 4, 2013*

**chemistry**

Write a balanced equation for the dissociation of Mg(NO3)2. I wrote Mg(NO3)^2(s)==>Mg^2+(aq)+NO3^3-(aq) That isn't the answer in the book. Can someone explain to me how dissociation works?
*November 1, 2013*

**chemistry**

Write the balanced equation for the hydration of CuSO4. Indicate the physical states using the abbreviations (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) to indicate the aqueous phase. Indicate appropriate charges on negative and positive ions if they are...
*November 1, 2013*

**chemistry**

How would i use the grams in this equation though?
*October 23, 2013*

**chemistry**

A 0.286g sample of carbon dioxide, CO2, has a volume of 585mL and a pressure of 495mmHg . What is the temperature, in kelvins and degrees Celsius, of the gas?
*October 23, 2013*

**Chemistry**

What is the volume in liters of 3.0moles methane gas, CH4, at 12∘C and 1.48atm ?
*October 23, 2013*

**Science**

contact Lenses improve lives. Contact lenses are an example of an __________. my answer is indepentant variable. Someone help. it's for a science experiment.
*October 4, 2013*

**Physics **

Air resistance acting on a falling body can be taken into account by the approximate relation for the acceleration: a= dv/dt = g - kv, where k is a constant. (a) Derive a formula for the velocity of the body as a function of time assuming it starts from rest (v=0 at t=0). [...
*September 26, 2013*

**math grade 10 **

Solve 3p-6q = 0 4p+1q = 3 Using any method Thank you!!!!
*September 23, 2013*

**algebra**

A rectangular box has Dimensions 16 inches and 22 inches and volume 4224 cubic inches. If the same amount is decreased from the largest and smallest sides, the volume of the new box is 6/11 of the first box. Find the dimensions of the second box.
*September 17, 2013*

**Maths**

At the beginning of the week, a particular stock sold for 29 3/8 per share. At the end of the same week it sold for 31 2/8. What was the amount per share?
*September 11, 2013*

**english 101**

which of the above topics are appropriate for an expository essay? why do you think so? which of the above topics are appropriate for a persuasive essay? explain. what differentiates an expository essay from a persuasive essay?
*August 22, 2013*

**CIS**

Chocolate Delights Candy Company manufactures several types of candy. Design a flowchart using Visual Logic for the following: A program that accepts a candy name (for example, “ chocolate-covered blueberries”), price per pound, and number of pounds sold in the ...
*August 11, 2013*

**Statistcs**

Please help I am so lost and my book shows me nothing helpful. You are interested in the incomes of your customers. A sample of 100 customer incomes yields a standard deviation of $141,421 and a mean of $300,000: a. Determine the point estimate b. Determine the interval ...
*August 9, 2013*

**Chemistry**

What is the Lewis structure formula, electron pair geometry and the molecular geometry for SO4^2-
*August 7, 2013*

**earlychildhood**

when a teacher hears a preschool student using incorrect language she should
*August 2, 2013*

**bacteria**

at 52 degrees F, how fast does bacteria grow? At 37 degrees F, how fast does bacteria grow?
*July 5, 2013*

**Physics**

A block of mass m1 is on top of a block of mass m2. Block 2 is connected by an ideal rope passing through a pulley to a block of unknown mass m3 as shown. The pulley is massless and frictionless. There is friction between block 1 and 2 and between the horizontal surface and ...
*June 23, 2013*

**math**

4800
*June 13, 2013*

**math**

if you have two thirds of lace and another pattern calls for five ninths of lace,how much more did the first pattern call for?
*May 8, 2013*

**chemistry**

Is benzophenone soluble in phosphoric acid?
*April 30, 2013*

**english**

ms sue can u help me?
*April 24, 2013*

**english**

ive read the book. im having trouble answering them...
*April 24, 2013*

**english**

questions based on the book to kill a mockingbird: describe mr radley(not nathan radley. what does jem do to thank their mysterious benefactor and what happens after.
*April 24, 2013*

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