Sunday

February 19, 2017
Total # Posts: 319

**Chemistry**

Confused again ok I have to find the number of atoms in carbon with a mass of 13.5. So this is what I didi. 13.5 / 12.01* 6.022 *10^23= 6.77x10^23 but the correct answer is 6.74x10^23 what have I done wrong

*September 25, 2011*

**Chemistry**

Ok I'm given 38.5 mg as mass. I have to find moles and number of atoms. Am I also converting mg to g? If so please help

*September 25, 2011*

**Chemistry**

How many moles of gold atoms do 3.45 x 10^24 gold atoms constitute. This is what I did 3.45 x 10^24 x 1 / 6.022 x 10^23 = 573 am I right

*September 25, 2011*

**Chemistry**

Ok what I did wrong was say 48 O atoms instead of just 3. Thank you very much

*September 23, 2011*

**Chemistry**

Very confused! Converting between grams of a compound and grams of a constituent element Determine the mass of oxygen in a 5.8 g of NaHCO3 5.8 g NaCHO3 * 1 mol NaCHO3/ 84.01 NaCHO3 * 48.00 mol O / 1 mol NaCHO3 * 16.00 g O/ 1 mol = I got 53 but the answer is 3.3 g O Help what ...

*September 23, 2011*

**Chemistry**

When I worked the question I got cu = 0.0196 and o= 0.0196 so the empirical formula is CUO

*September 21, 2011*

**Chemistry**

A 1.250 g sample of copper wire was heated in air and reacted with oxygen to give 1.565 g of copper oxide product. Calculate the empirical formula of the copper oxide. Please help I'm lost. I need step by step Please and thank you

*September 21, 2011*

**Geometry**

A 30-foot cable is suspended between the tops of two 20-foot poles on level ground. The lowest point of the cable is 5 feet above the ground. What is the distance between the two poles?

*September 20, 2011*

**Math**

Sorry if you spend $4 every 7 mins, in 9 days you'll spend how much

*September 12, 2011*

**Math**

A car covers 2924 km in 43 hrs. What is it's speed

*September 12, 2011*

**Chemistry**

Write the Lewis structure for each ion Al3+ Mg3+ Se2- N3- My question is why does Se2- get a bracket and 8 dots. And the same for N3-. I hope I'm making sense.

*September 11, 2011*

**Math**

Chris works an electrician with the Central Electric Company. He earns $16.25 per hour with time and a half after 40 hours. If he works 43 hours Monday through Friday, how much will he earn?

*September 9, 2011*

**Chemistry**

I don't understand what valence electrons and core electrons are. Ex: Se = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4 What makes 4s2 and 4p4 valence electrons and the rest core

*September 4, 2011*

**Science**

When a boxer has been knocked out what part of his brain has been affected?

*September 3, 2011*

**Science**

Rip Van Winkle was a man who slept 20 years Upon autopsy, it was found that there was structual damage to his?

*September 3, 2011*

**Psychology**

When a boxer is knocked out, it is believed that his _____ has been affected.

*September 3, 2011*

**Chemistry**

Silver has a density of 10.5 g/cm3 and gold has a density of 19.3 g/cm3. Which would have a greater mass, 5 cm3 of silver or 5 cm3 of gold

*September 1, 2011*

**Chemistry**

An irregular shaped stone was lowered intro a graduated cylinder holding a volume of water equal to 2.0 ml. The height of the water rose to 7.0 ml. If the mass of the stone was 25 g, what was the density

*September 1, 2011*

**Law**

Thanks Ms. Sue

*August 31, 2011*

**Chemistry**

What are the atomic number (z) mass number (a) and symbols of the carbon isotope with 7 neutrons. What is and how do I get the mass number?

*August 31, 2011*

**Law**

What was the real significance of the Mempa case? What is the difference between a suspended sentence and probation?

*August 30, 2011*

**Chemisrry**

If the specific gravity of E85 gasohol is 0.801' what is the mass of 1.00 gallon of th E85 fuel. Given 1 gallon = 3.75 liters

*August 30, 2011*

**Math**

A thin lead apron is used in dental offices to protect patients from harmful X rays. If the sheet measures 75.0 cm by 55.0 cm by 0.10 cm, and the density of lead is 11.3 g/ cm, what is the mass of the apron in grams?

*August 30, 2011*

**Chemistry**

Serine exists in its zwitterion form at a pH of 5.7. Draw the structural formula for the same. Explain the manner in which the structural formula of polar and non-polar amino acids would vary.

*August 10, 2011*

**marketing**

What is the best approach for marketing services such as a City's best features to attract tourism?

*August 9, 2011*

**english**

using atleast five different pronouns, adverbs, and adjectives, write several sentences describing a recent interaction with a friend of a "ritual" you celebrate.

*July 25, 2011*

**Chemistry**

A 50g sample of metal was heated to 100 degrees Celsius and then dropped into a beaker containing 50g of water at 25 degrees Celsius. If the specific heat of the metal is .25 cal/g degrees Celsius, what is the final temperature of the water? A. 27 B. 40 C. 60 D. 86 (units are ...

*July 23, 2011*

**physics**

In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that ...

*April 14, 2011*

**Finance**

A three-year bond has 8.0% coupon rate and face value of $1000. If the yield to maturity on the bond is 10%, calculate the price of the bond assuming that the bond makes semi-annual coupon interest payments.

*April 8, 2011*

**linguistics**

Give two different kinds of specific examples of transfer from an L1 to and L2? A particular grammar construction, a particular pronunciation, and a particular word meaning

*March 26, 2011*

**linguistics**

Describe how the verb argument structure(VAC)subject+verb++lo… is learned by a second language learner? why or how based on Ellis and Larsen-Freeman(2009) and Eskilsden(2008) all make the case that second language learning emerges from usage, from a learner's ...

*March 26, 2011*

**linguistics**

Describe what contrastive analysis is and what transfer is(both positive transfer and negative transfer)?

*March 26, 2011*

**linguistics**

Describe what contrastive analysis is and what transfer is(both positive transfer and negative transfer)?

*March 26, 2011*

**linguistics**

Give two different kinds of specific examples of transfer from an L1 to and L2? A particular grammar construction, a particular pronunciation, and a particular word meaning

*March 26, 2011*

**Green**

Describe how the verb argument structure(VAC)subject+verb++lo… is learned by a second language learner? why or how based on Ellis and Larsen-Freeman(2009) and Eskilsden(2008) all make the case that second language learning emerges from usage, from a learner's ...

*March 26, 2011*

**math 1-2**

how do you change a linear equation to make the graph steeper?

*January 19, 2011*

**math 1-2**

thank you very much Reiny

*January 19, 2011*

**math 1-2**

how do you change a linear equation to shift it up or down

*January 19, 2011*

**Math**

48 = dividend 6 = divisor 8 = quotient

*January 19, 2011*

**math**

y=2x-5 a third as steep

*January 19, 2011*

**Physics**

Three identical stars of mass M form an equilateral triangle that rotates around the triangle's center as the stars move in a common circle about that center. The triangle has edge length L. What is the speed of the stars?

*January 11, 2011*

**Physics**

A construction worker attempts to lift a uniform beam off the floor and raise it to a vertical position. The beam is 2.50m long and weighs 500N. At a certain instant the worker holds the beam momentarily at rest with one end at distance d=1.50m above the floor by exerting a ...

*January 10, 2011*

**Algebra**

maximize Z = 30x+50y subject to 2x+4y=100 and x+5y=80

*January 7, 2011*

**managerial finance- grad level**

An option can often have more than one source of value. Consider a logging company. The company can log the timber today, or wait another year (or more) to log the timer. What advatages would waiting one year potentially have? Name three considerations.

*January 6, 2011*

**RSNHS**

What is the limit of 1-2x^2 -2cosx + cos^2x all over x^2? please answer ASAP. TY

*December 13, 2010*

**science**

Standars enthalpy Mg(OH)2 + H2SO4 = MgSO4 + 2 H2O

*November 24, 2010*

**algebra**

5+16x<-59

*November 8, 2010*

**statistics**

use the normal distribution to approximate the desired probability. find the probability that in 200 tosses we will obtain at least 40 fives.

*October 16, 2010*

**10th grade Honors English**

how should I start my paper on persuading my teacher that I'll get an A in her class

*September 1, 2010*

**geometry**

In an isosceles triangle, the measure of the vertex angle is 4x. The measure of each base angle is 2x + 10. What is the actual measure of the vertex angle?

*August 8, 2010*

**COM156**

How has media convergence changed American culture?

*August 1, 2010*

**College physics**

The magnetic field at the center of a 0.70-cm-diameter loop is 2.4 mT. What is the current in the loop? A long straight wire carries the same current you found in part a. At what distance from the wire is the magnetic field 2.4 mT?

*July 26, 2010*

**College physics**

If the force increases when the current increase what can you say about the force on a current element as a function of the current?

*July 26, 2010*

**substitution method**

7x+9y=-86 x-y=6

*July 20, 2010*

**College physics**

Find the following potential differences. The magnitude of the potential difference DeltaV1 across the resistor of resistance R1 = 15.0 Ohm. The magnitude of the potential difference DeltaV2 across the resistor of resistance R2 = 45.0 Ohm. The magnitude of the potential ...

*July 17, 2010*

**College physics**

Find the following currents. The current I_1 through the resistor of resistance R1 = 15.0 Ohm * The current I2 through the resistor of resistance R2 = 45.0 ohm. * The current I3 through the resistor of resistance R3 = 20.0 Ohm. * The current I4 through the resistor of ...

*July 17, 2010*

**Geography**

[THESE QUESTIONS ARE NOT THE SAME AS MY PREVIOUS POST) I am working on my take home quiz questions now...and i am not sure about the answers of the folowing questions...can anyone please help me to check???? THANKS A LOT!!!! (The "*" represents the answer I chose) ...

*July 7, 2010*

**Geography**

I am working on my take home quiz questions now...and i am not sure about the answers of the folowing questions...can anyone please help me to check???? THANKS A LOT!!!! (The "*" represents the answer I chose) In the United States, early warning systems have not ...

*July 7, 2010*

**grammar**

Could you please give an example of a topic sentence?

*April 13, 2010*

**CRT 205**

Assignment: Argument Evaluation · Read the article “Controlling Irrational Fears After 9/11” on pp. 456–458 of Appendix 1. · Identify at least two arguments in the article. Outline the premises and conclusions of each argument you find. Then, ...

*April 10, 2010*

**History**

What impact did Martin Luther and John Calvin have upon the perceptions and events of the Old World?

*April 10, 2010*

**Final Project**

Create a 750-1,050 word survival guide that will serve a a resource throughout your program. Your guide should be formatted as a paper.

*February 26, 2010*

**science**

what three vitamina and minerals undergo the greatest percentage of increase during pregnacy?

*February 18, 2010*

**Sociology**

Imagine a society in which there are no social classes- no differences in people’s wealth, income, and life chances. What would such a society be like? Would it be stable or would its social structure change over time? How could you apply Max Weber’s theory to this ...

*December 28, 2009*

**chemistry**

how do you figure out how to Balance H2SO4+pb(OH)4=pb(SO4)2=H20

*December 7, 2009*

**Physics**

A child riding a bicycle has a total mass of 40kg. The child approaches the top of a hill that is 10m high and 100m long at 5m/s. If the force of friction between the bicycle and the hill is 20N, what is the child's velocity at the bottom of the hill? (Assume no air ...

*November 15, 2009*

**physics**

Which has more momentum, a speeding baseball or an ocean liner at rest in a harbor? Baseball. Ocean liner. Both the same. Can't say without more information. 2 . A truck moves with a certain momentum. If both its speed and its mass are doubled, how much greater is its ...

*November 9, 2009*

**physics**

Which has more momentum, a speeding baseball or an ocean liner at rest in a harbor? Baseball. Ocean liner. Both the same. Can't say without more information. 2 . A truck moves with a certain momentum. If both its speed and its mass are doubled, how much greater is its ...

*November 9, 2009*

**physics**

Yes! Thank you so much! I realized that you had to put gravity in but I couldn't figure out where. Thanks again!

*October 14, 2009*

**physics**

A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?

*October 14, 2009*

**science**

what special seasonal event happened september 22 2009

*September 30, 2009*

**AP Chemistry**

An organic compound was synthesized and found to contain only C, H, N, O, and Cl. It was observed that when .150g sample of the compound was burned, it produced .138g of CO2 and .0566g of H2O. All the Nitrogen in a different .200g sample of the compound was converted to NH3, ...

*September 15, 2009*

**buisiness**

Which of the following would a company use to securely link to a new user within a day ?

*September 15, 2009*

**math**

if you have 5 candy bars and have to share them with 20 people but 1/4 of the people gave up 50% of the total number of people. what % of the people had no candy? how many of the total had more than their share? How much was the original share every one suppose to get?

*September 8, 2009*

**Math (repost)**

How do find the inverse function for this problem: f(x) = -(x+3)^2, x is greater than or equal to 3 I know the first thing you do is switch the variables, so it looks like this: x = -(y+3)^2 Then expand: x = -y^2-6y-9 And solve for y: x + 9 = -y^2-6y I get a little confused ...

*August 8, 2009*

**Math**

oh, i also meant that x is greater than or equal to 3. sorry.

*August 8, 2009*

**Math**

How do find the inverse function for this problem: f(x) = -(x+3)^2, x is greater or less than 3 I know the first thing you do is switch the variables, so it looks like this: x = -(y+3)^2 Then expand: x = -y^2-6y-9 And solve for y: x + 9 = -y^2-6y I get a little confused after ...

*August 8, 2009*

**Calculus**

An open box is to be made from cutting squares of side "s" from each corner of a piece of cardboard 25" by 30". Write an expression for the volume, V, of the box in terms of s. -I have no idea where to start on this. I know V=lwh (length*width*height), but ...

*August 1, 2009*

**primary sources**

Oh,so they are primary sources.Thanks for the info I get it now :).

*July 14, 2009*

**primary sources**

Are these quotes primary sources?Why? It give me pleasure to announce...that the...removal of the Indians...is approaching to a happy end...We could not wish to see this continent restored to the conditions in which it was found by our forefathers.What good man would prefer a ...

*July 14, 2009*

**history**

Are these quotes primary sources?Why? It give me pleasure to announce...that the...removal of the Indians...is approaching to a happy end...We could not wish to see this continent restored to the conditions in which it was found by our forefathers.What good man would prefer a ...

*July 14, 2009*

**Math**

Using the TI-89 Titanium calculator: Find the largest and smallest values of each of the following functions on their given intervals. (I'll show you one) f(x) = 2^x + x^2 [-4, 1] I put in the function on the Y= screen as shown, then -4 < x < 1 (it's actually the...

*June 24, 2009*

**Algebra**

maximize Z = 30x+50y subject to 2x+4y=100 and x+5y=80

*March 23, 2009*

**math**

So 1 3/16?But how did you change th 5 1/16 to 4 17/16?

*March 9, 2009*

**math**

A piece of metal 3 7/8 inches long is to be cute from a longer piece of 5 1/16 inches.What will be the length of the remaining piece?

*March 9, 2009*

**Physical Science**

When attempting to solve a gravitational potential energy equation, is the free-fall acceleration always 9.8m/s2?

*January 26, 2009*

**math**

Actually calculate the final amount on $1000 compounded annually at 6% per year for 4 years.

*December 28, 2008*

**4th grade**

what do i find answer to this question how much time has passed? start 11:05 am end 3:20 pm

*November 10, 2008*

**History**

was Rupert's Land named after King Rupert?

*September 22, 2008*

**CHEMISTRY**

10-g what does it mean?

*September 17, 2008*

**high school**

how many ml of moffine at a dosage of 0.1mg/kg in a consentration of 1.5mg/ml should be given to a 30kg dog

*September 15, 2008*

**science**

how many ml of moffine in a dosage of 0.1mg/kg in a consentgration of 1.5mg/ml should be given to a 30kg dog.

*September 15, 2008*

**college**

how many ml of moffine at a dosage of 0.1 mg/kg in a consentgration of 1.5mg/ml should be given to a 30kg dog.

*September 12, 2008*

**urbanization**

I need help with a 7 to10 slide power point on 1996 award winners, dicssion how they over came one of the challenges

*September 8, 2008*

**Statistics #3**

THANK YOU

*June 11, 2008*

**Statistics #3**

The estimate of the population proportion is to be within plus or minus .10, with a 99 percent level of confidence. The best estimate of the population proportion is .45. How large a sample is required?

*June 11, 2008*

**Math Statistical #2**

Research at the University of Toledo indicates that 50 percent of the students change their major area of study after their first year in a program. A random sample of 100 students in the College of Business revealed that 48 had changed their major area of study after their ...

*June 11, 2008*

**Math**

A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students: Major Gender Accounting Management Finance Total Male 100 150 50 300 Female 100 50 50 200 Total 200 200 100 500 a. What ...

*June 11, 2008*

**Statistics**

A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students: Major Gender Accounting Management Finance Total Male 100 150 50 300 Female 100 50 50 200 Total 200 200 100 500 a. What ...

*June 11, 2008*

**Statistics**

Thank you

*June 10, 2008*