Tuesday
January 24, 2017

Posts by LULU

Total # Posts: 348

chemistry
2Na + 2H2O---> 2NaOH + H2 Need to find the molecules of H2 Atomic wt o Na = 23 48.7 g of Na 48.71/23 = 2.12 mols Na 2.12/2 × 24. (WHERE DOES THE 24 COME FROM) = 25.44 dm^3 H. (PLEASE EXPLAIN THIS PART) = 1.06moles 1.06mols× 6.02×10^23 avagados number= 1....
January 7, 2017

algebra
P +4- 2 (p-10)> 0 Please check, it was marked wrong P+4 -2p +20 > 0 -p+ 24> 0 -p >-24 P > 24 Answer choices are 29, 26, 24, 22 Please explain thank you
January 4, 2017

Math
What does 5 yards 2 feet 3 inches plus 2 yards 2 feet 9 inches equal?
January 4, 2017

algebra
Could you please help? What are the solutions of the compound inequality? 2x - 2 < - 12 or 2x+3 > 7 Is this one x < - 5 or x> 2 2x -1/3 +3 <= -4. Or 8x-2/2 -1 >= 6. This one is 2x-1 divided by 3 plus 3 is less than or equal to - 4 or 8x -2 divided by 2 minus ...
January 2, 2017

math
On the blueprints of Adam's office building, the length of his rectangular office space is 5 1/4 inches. If the actual length of Adam's office space is 10 1/2 feet, what is the scale of the blueprint?
December 14, 2016

Math
I don't know how to do my homework I'm in 4th grade and in Manchester gate in m's snyders class help me ppplllzzzz Its 2016
December 14, 2016

chemistry
Is this balanced properly 2H2O2----> 2H2O +O2 Thank you for the reactions of zinc and acetic acid. REAL QUESTION, if I was to rub all the copper off of a new penny down to the zinc, what would be the appearance of the zinc if I left it in vinegar (acetic acid ) for 30min. I...
November 13, 2016

chemistry
Dr Bob, Sorry about this penny thing, but if I was to put pure zinc into acetic acid, what would happen to the zinc?
November 13, 2016

Chemisry
If you put copper coated penny 1983or newer, in vinegar, it turns blackish green. If you rub the copper off half the penny first and expose the zinc, put the penny in vinegar, will the results change? Thank you.
November 13, 2016

Math
How many letters are there in the correct answer for this question? a. One b. Two c. Three d. Four e Five
November 8, 2016

Masth
November 8, 2016

Masth
How many letters are there in the correct answer for this question? a. One b. Two c. Three d. Four e Five
November 8, 2016

algebra
Could you pls tell me why I have to change this sign. You should look at the sign like an equal sign. -2/5x -9 < 9/10 -2/5x < 99/10 x < -24.75 Why is this wrong? - I know the answer should be x> -24.75, but why? if this got sent twice, it is by error. Sorry.
November 8, 2016

Algebra
The plane is 300 miles west of city A. You need to go 1500 more miles to get to 1800 miles west of city A. The plane is flying 400 mph. So, 400x= 1500. 400 being speed, x being hours, and 1500 being miles. so, you get 3.75 hours. You need to change the .75 hours into minutes, ...
November 8, 2016

algebra
Could you pls tell me why I have to change this sign. You should look at the sign like an equal sign. -2/5x -9 < 9/10 -2/5x < 99/10 x < -24.75 Why is this wrong? - I know the answer should be x> -24.75, but why?
November 8, 2016

Maths
Anne & Tom competed in the 200m long distance swimming race. After the first 50 meters, Anne had gained 2 seconds against Tom's time. Over the next three laps, Tom gained 1.5 seconds, then lost 2.1 seconds and then gained 1.7 seconds. Who is the winner and by how much?
November 1, 2016

Matrh
Anne & Tom competed in the 200m long distance swimming race. After the first 50 meters, Anne had gained 2 seconds against Tom's time. Over the next three laps, Tom gained 1.5 seconds, then lost 2.1 seconds and then gained 1.7 seconds. Who is the winner and by how much?
November 1, 2016

English
I would say shouldn't. They taught me, if you read it without the n't, anad say should not or ought not, should not sounds correct. I probably learned that rule 10 years ago and it usually works. Wait for Ms. Sue though.
October 30, 2016

Math
Sorry, I meant half of 82.. so in 10x+1=41. Anyway, x= 10. Hope I caught you in time.
October 30, 2016

Math
POS= 1/2 of 82, so 10x+1= 42. You can do that. A bisector splits something into 2 equal halves. If you can't get it , draw a picture, it helps. if you are in Geometry, go to you tube videos and watch yay math videos. They saved me last year.
October 30, 2016

US History
If you have a map of 19th century US and the names of the states are changed to Irish names, ie: Irish Sea , Mulligan, etc. And the question was to compare the map to a typical US map, would you answer with just explaining the obvious changes, or is there some hidden message ...
October 30, 2016

algebra 2
I don't know if he does algebra, but look for Yay Math videos on U tube. He saved me in Geometry last year. He could be a little annoying, but he is a great teacher. Hope this helps.
October 30, 2016

math
Give reason 8454 is divisible by 6
October 24, 2016

chemistry
Back to the atomic emmission spectrum and the atomic theory. in the 1900s, scientists observed that when a gaseous element, such as hydrogen was subjected to an electric discarge that the atoms emitted electromagnetic radiation. The light emmitted could be separated into ...
October 15, 2016

chemistry
Explain how understanding of the atomic emmission spectrum led to developement of the atomic theory. The emmissions spectrum for each element is unique. You can identify an eleement by its spectrum. The atomic theory states that all atoms of a given element are identical. The ...
October 15, 2016

chemistry
Element x Isotope 55x 60% Isotope 56x 30% Isotope. 57x 10% 55× 60 =3300 56×30=1650 57× 10= 570 Add them up5520 divide by 100 the atomic weight of x is 55.2 Pls check if this is correct , answer and method
October 14, 2016

chemistry,
Could you pls check back a few questions. The first 1 or 2 digits in each nmber is the family number, so the numbers do not go on a consistant trend. Thank you
October 13, 2016

chemistry
For the elements in row 2 of the PT discover the relationship between ionization and the family number of the element Element. Family. Ionization Ener Lithium. 1 13.6 beryllium. 2. 9.3 boron. 13. 8.3 carbon. 1 4. 11.27 nitrogen. 15 14.53 oxygen. 16. 13.62 fluorine. 17. 17.42 ...
October 13, 2016

I go there also, and the workload is impossible. If Iit only took him 1 hour, it would have taken me a day and a half. He probably used outside sources or run his work through check my work.
October 13, 2016

chemistry
Could you pls just answer this also. Does the family number coincide with the number of electrons in the outer shell of an atom in that family? I just got a brainstorm. Thanks again.
October 12, 2016

chemistry
When calling the families on the periodic chart by the top or first name in the column, where hydrogen is a non metal, and in family 13, where boron is a metaloid , is it correct to call those families the hydrogen or lithium family or/ and the boron family and for family 14, ...
October 12, 2016

Social Studies
1 - How does one person become a citizen? (Select 2) - a person is born in the United States - a person of foreign birth is granted citizenship after living in the U.S. for 5 years - a person of foreign birth successfully completes the naturalization process ** - a person ...
October 6, 2016

Chemistry
Also, I had a question a ways back, it may havebeem skipped over, Does helium has an ionic radius? Thank you
October 6, 2016

Chemistry
Is the atomic mass or atomic weight on the periodic table written in grams.
October 6, 2016

Chemistry
Does helium have an ionic radius? I searched and looked in an old Chem book, and come up empty. Hydrogen is not listed either. Is there a specific reason for this? Thank you.
October 5, 2016

US History
Could you pls check this time line 1, king George issues Proclamation of 1763 2, stamp act 3. Sons of Liberty 4. Boston Massacre 5. Boston Tea Party 6, coersive acts 7, 1st continental congress 8. 2nd continental congree 9. First sho of American revolution 10. Bunker hill ...
September 24, 2016

Chemistry
When you mixand separate CaCO3 and SiO2 with acetic acid-vinegar, it is a chemical reaction. It bubbles and CO2 is produced. What property of CaCO3 causes this to happen? Could you explain this to me pls. I am guessing the acetic acid reacts with one of the acetic acid, but ...
September 21, 2016

Math
the Pythagorean theorem a square + b square = c square a square + x square = 4 square how to find x square?
September 18, 2016

Math
what is the smallest number that 54 can be multiplied by to give a perfect square?
September 15, 2016

algebra
The width of a rectangle is 5 less than twice its length. If the area of the rectangle is 79 cm22, what is the length of the diagonal?
September 11, 2016

algera
A cash register contains only ten dollar and fifty dollar bills. It contains three times as many ten dollar bills as fifty dollar bills and the total amount of money in the cash register is \$2,080. How many ten dollar bills are in the cash register?
September 11, 2016

math or chemistry
5.4 x10^-2 by 2.5 x10^-3 by 7.9 x10^-3m volume = 106.65 x10-8m^3 Check pls yesterday you said 106.65 x10^-6. If you add 2+3+3 you get 8 is that right? Just want to make sure I'm doing it right. Thank you. I may have witten it differently.
September 10, 2016

chemistry
Sig figs 33.067. 5 sig figs .0908. 3sig figs 1099. 4 .0087. 2 check pls
September 10, 2016

math or chemistry
Check pls. 5.4 x 10^-2 by 2.5 x 10^-3 by 7.9 x10^-3 m volume = 107.44 x 10^-8 m^3
September 10, 2016

math
three fireworks are fired at the same time. The first one is fired every 64 seconds, the second one is fired every 84 seconds and the third one is fired every 96 seconds. How many seconds after they start will it take until all three fireworks are again fired together?
September 9, 2016

Chemistry
Confused, conflicting texts when you are finding % error for density formula: experienced value-accepted value/ accepted value ×100. Does the ×100 cancel out the percent sign? EX; 7.28g/mL-6.54g/mL/6.54g/mL ×100. Is the answer 11.31 or 11.31% The lab video ...
September 7, 2016

chemistry
What particle is needed to complete this equation 14/7N+ _______=14/7C+ 1/1H I think it is a beta particle because of beta decay and transmutation. I could be really off because this chapter is really confusing me.
May 30, 2016

chemistry
If I have a sample from doing a half lfe lab with m&ms, not timed, just pulling out decayed or m&ms with rhe m on top, how do I calculate the half life using t1/2=(.693)/k formula. Do I have to do this 9 times as it took 9 trys to use up all the m&ms. I am not really sure what...
May 29, 2016

W. History
I know what the domino threty is. Question is, What 3 aspects of foreign policy do we see the domino theory reflected? I assume they are talking from 60's to 70's. I don't like to submit w/o an answer, but if someone could help, I'd be extremely appreciative. ...
May 18, 2016

Grammar
May 15, 2016

Medical Transcription Editing
pain discomfort is (auxillary verb)
May 15, 2016

geometry and trig
If a cylinder with a 4 inch diameter and a 6 inch height holds 1 pound of oatmeal. How much oatmeal will a cylinder (similar) with a 10 inch diameter hold? Volume of 4 in-----24pi volume of 10 in----137pi I get 91 oz choiced are37,44,74, 192
May 10, 2016

language arts
Thank you!!! I'm literally screaming and jumping! :)
May 3, 2016

language arts
1. What is the prepositional phrase in the sentence: The family drove to the store. a. the family drove b. drove to the store c. the family d. to the store *** 2. What is the appositive phrase in this sentence: My mother, Rebecca, loves to eat pumpkin pie. a. Rebecca *** b. my...
May 3, 2016

Geometry
7 is the hypotenuse. 4 and 6 are either opposite to or adjacent to angle A. Tangent is opposite/adjacent. Use 4 and 7 to fill in opposite/ adjacent depending on their location.
April 29, 2016

Chemistry
One more, confused How can you tell by the periodic chart which ions of metals are most easily reduced or oxidized. A website or video would be fine. I know it is quite involved. thanks again
April 29, 2016

chemistry
Dr Bob Could you check this please? Voltaic cell---cathode is positive, accepts electrons, reduced, anode is negative, gives up electrons and is oxidized Electrolytic cell------cathode is negative, accepts electrons and is reduced. Anode is positive, givesup electrons and is ...
April 29, 2016

Chemistry
A 110g piece of copper is heated and the temperature changes from 38C to 172C. The heat absorbed is 686 cal. What is the specific heat of copper. I think the answer is .385, but I have tried 100 different ways to get this answer or anything close, and I am lost..it is just a ...
April 17, 2016

chemistry
What is the equilibrium constant for 2A + 3B (double arrow) =4C Is it (C)^c/ (A)^a (B)^b
April 17, 2016

chemistry
Calculate the energy needed to produce 10 moles of Cl2O7 using this balanced equation. 2Cl +70+ 100kCal==2ClO7 please explain steps if I needed to calculate for 7 moles, how would it change?
April 16, 2016

Biology , AP Biology
April 16, 2016

Math
A student cuts 1/3 of a coil of wire. He then cuts out another piece that was 8 meters long (I assume from the remaining coil). The two pieces of cut off wire are only half the total length of the wire. How long was the coil before the student cut it? I am getting 25, 50, to ...
April 14, 2016

life orientation
Need help with the conclusion plzzz
April 14, 2016

Science
What is anything that has mass and takes up space? 1) Weight 2) Volume 3) Density 4) Matter When you measure the boiling point of mercury, you are investigating a ____. 1) Chemical change 2) Chemical property 3) Physical change 4) Physical property Ab object weighing 90 N has ...
April 6, 2016

geometry and trig
I figured out my mistake. With thearea of the triangle, I forgot the .5 thanks steve, sometimes you need another perspective.
March 30, 2016

geometry and trig
I have a regular octagon with a radius of 9. I have split the 8 pie slices into right angles--leaving angles 90, 67.5, and 22.5. I looked for the sine of 22.5 opp/hyp and get .38. Then the oppositeside is 6.84. I can't get the right answer, what am I doing wrong? Thanks
March 30, 2016

chemistry
Make the conversion 8.5 x10^2 cal to Calorie 4.5x10^-1kj to calories
March 28, 2016

chemistry
Ould you please offer me some insight to this, Calculate the hydrogen ion concentration (H+) for the aqueous solution in which (OH-) is1×10-15 mol/L. Is this solution acidic, basic or neutral? Thanks in advance
March 20, 2016

chemistry
Then the answer would be 4828 grams, right. I was using 2 molecules of SO4. What is the mass of Na2SO4 needed to make 8.5L of 4.0 M solution?
March 20, 2016

chemistry
What mass of Na2SO4 is needed to make 8.5L of 4.0M solution? Is the answer 7480 grams?
March 20, 2016

Chemistry
What is the maximum amount of KCl that can disolve in 500 g of warer? The solubility of KCl is 34g/100 g H2O at 20 degrees C.
March 19, 2016

chemistry
Dr Bob, Thanks for your help. Ihad googled for 3 hours before asking you. For future reference, if anyone asks this question again, 10th grade chemistry, I found a video on You Tube that makes it easy to understand. It is, The Sci Guys, Ph indicator, acid-base indicator. ...
March 5, 2016

chemistry
Thanks for your help. I did google for 3 hours before I came here. You asked me to specify the lab I was doing so I did. Thank you again.
March 5, 2016

chemistry
In the red cabbage lab, we just took the cabbage juice and in 5 separate cups mixed it with 5 different liquids, ex: coke, milk, cleaning agent, etc, and matched the color to a ph chart to tell if it was a base or an acid. Simple lab. The question needs a relatively simple ...
March 5, 2016

Chemistry
Explain the chemical changes that occur in the red cabbage lab that changes the color of the cabbage juice. I know it has something to do with the hydrogen ions and maybe something to do with the electrons, but I don't understand what or how to answer this question
March 4, 2016

chemistry
what chemical changes are responsible for the color changes in the red cabbage lab?
March 4, 2016

Social Studies
Thanks Everybody!
February 26, 2016

What steps take place during DNA replication
January 12, 2016

english grammar
I am very sorry. What does the adverb very modify
December 8, 2015

Grammar
I am very sorry. What does the adverb very modify.
December 5, 2015

English
Thanks
November 11, 2015

English
I looked it up and it says become is ALWAYS a linking verb. It seems confusing because you would expect a linking verb to link 2 verbs as in: has become, had jumped, and became is alone. It is not has become.
November 11, 2015

English
Action because there is not any other verbs with it.
November 11, 2015

English
White House pets become almost as well known as their owners, what type o verb is become?
November 11, 2015

English
Whe Abe Lincoln was president, he had a turkey. what type of pronoun is he?
November 11, 2015

English
Teddy Roosevelt kept a pet snake. What type of noun is snake.
November 11, 2015

Health
Salted caramel is right
November 6, 2015

AP 1 Physics
A motorcycle has a constant speed of 25.0 m/s as it passes over the top of a hill whose radius of curvature is 144 m. The mass of the motorcycle and driver is 326 kg. Find the magnitudes of the following. Centripetal force: mv^2/r = 1414.93 N Normal force: ?? I tried N = mg...
November 3, 2015

english
Kiki is wrong
October 29, 2015

compare and contrast Rational (formal) model for strategy- emergent strategy
October 11, 2015

human resources
prepare HR plan for the production and line department
October 11, 2015

Macroeconomics
I found out a few answers myself 1. 6 2. ? 3. b
September 20, 2015

Macroeconomics
Suppose that Paulie and Vinny each can produce ice cream or t-shirts. it shows the quantity of each good that Paulie and Vinny each can produce in one hour, respectively, if they devote all of their time and effort into making the good. paulie can make 3 ice cream (cups) ...
September 20, 2015

POL 201 History
Under the "necessary and proper" clause, Congress may? A. Do as it pleases B. Not do anything unless it has been enumerated C. Do that which is necessary to exercise its enumerated powers D. do that which is necessary even if it violates the basic tenets of the ...
June 28, 2015

Hisrory
Please let me know if I am close..Thanks
June 28, 2015

Hisrory
I think I have found the answer I think it is C...???
June 28, 2015

Hisrory
In Cooperative Federalism A. relations between the states and national government are characterized as hostile. B. there is a strict separation between the states and the national government. c. relations between the states and national government are characterized by ...
June 28, 2015

Maths trig
Sketch the graphs of f(x)=3overx+1 and g(x)=-2x-4 on the same set of axes
June 17, 2015

1. Pages:
2. 1
3. 2
4. 3
5. 4
6. Next>>