Wednesday
July 27, 2016

Posts by Allie

Total # Posts: 337

Maths
Given sec θ =(square root) 10 and tan θ = 3, determine the following, csc(90° − θ)
July 9, 2016

Maths
If sinθ = (square root) 3/2 , find the value of θ in degrees (0 < θ < 90°)
July 9, 2016

English
B is wrong. It is C
May 19, 2016

Chemistry
What is the pH of a solution prepared by mixing 50.0 mL of 0.010 mol/L HCl(aq) and 50.0 mL of 0.010 mol/L Ca(OH)2(aq)? Assume the temperature is 25 degrees Celsius. Additional information given: Kw = 1.0×10^−14 at 25 degrees Celsius. The possible answers are: A) 2....
May 4, 2016

enlish part 1
A Lincoln Preface is an example of what kind of writing?
May 4, 2016

Chemistry
0.012
March 4, 2016

CHEMISTRY
I'm showing the procedure of the lab and what was asked. What I have question on is towards the end. Much help would be appreciated a lot!! First I had to balance the equation given to me: 2 Na HCO3 (s) Δ over arrow (produces) Na2 CO3 (s) + CO2 (g) + H2O (g). From the...
February 22, 2016

CHEMISTRYHELPP!! BOBPURSLEY
I only did that ^ to get your attention. Thankyou for your help.. 2. so is it 2.9000 because technically thats wrong cuz theres 3 digits on the right of the period right? or is it 20.900 but that woudn't make sense. even if it was 02.900, the zero wouldn't matter. so ...
February 22, 2016

CHEMISTRY
I'm showing the procedure of the lab and what was asked. What I have question on is towards the end. Much help would be appreciated a lot!! First I had to balance the equation given to me: 2 Na HCO3 (s) Δ over arrow (produces) Na2 CO3 (s) + CO2 (g) + H2O (g). From the...
February 22, 2016

Chemistry
1. Would it be advisable to determine the freezing point of pure p-dichlorobenzene with one thermometer and the freezing point of the solution with a different one? Explain. 2. If 0.150 mole of a nonvolatile non-electrolyte solute is present in 1200g of water, what are the ...
February 19, 2016

English
Why do u put like three stars in the end is the the answer
January 28, 2016

Algebra 2
Find the x and y intercepts for the following parabolas. y=(x+12)^2-144 y=(x-8)^-4
December 15, 2015

math
A.) write the rational expression as an equivalent expression whose denominator is the given polynomial. 1.) 6/7x^2y = ________/49x^3y^2 B.) perform the indicated operations, simplify if possible. 2.) x^2-3x-4/x^2-16 x x+4/3x-9
December 6, 2015

Algebra
A 6 m by 9 m swimming pool is surrounded by a deck which has a constant width. How wide is the deck if its area equals the area of the pool? I got 6*9=54 so for the deck xy=54 but I don't know where to go.
December 3, 2015

Algebra
Great Job Steve, I like that you didn't put only the answer. I needed help with the last one and you really helped.
November 29, 2015

AP Chemistry
Hey guys! I have answers, but am confused. Please and thanks for any help! A) Which of the following is false? 1.A spontaneous change occurs by itself without assistance. 2.The greater the statistical probability of a state, the greater is its entropy. 3.A non-spontaneous ...
November 9, 2015

AP Chem (Conceptual Questions)
Hey guys! If you could just please, look over a few of these conceptual problems because I'm pretty confused? (I put what I think is the answer below each question). Thank you for any help in advance!!!! A.Which statement *does not* apply to a heterogeneous catalyst? 1.It ...
November 1, 2015

AP Chem
Hey guys! I'm not really stuck on this problem, but I was wondering if someone could look it over to make sure that what I did makes sense. Thank you: 1) Balance this equation. What is the coefficient in front of I2? IO− + I− --> I2 in acidic solution Maybe ...
October 25, 2015

AP Chemistry
I'm so sorry to bother you guys again! Stuck on two other questions: 1. In the following equilibrium: NaCl(s) Na+(aq) + Cl–(aq), would adding more NaCl(s) increase the Cl-(aq) concentration? Explain why. My thoughts: I thought that it wouldn't increased the Cl- ...
October 22, 2015

AP Chem (Thanks!)
Hey guys! Stuck on some! My maybe answers are written next to the problem (1 problem-5 parts). Thanks for any help: 1. Lead (II) chromate, PbCrO4, is a slightly soluble salt. Write a net ionic equation for the dissolution of solid PbCrO4 in water. My thoughts: PbCrO4+2H+-->...
October 22, 2015

CHEMISTRY!!!
12.) If 4.75 * 10^23 atoms of silver are placed on one side of a platform balance, how many atoms of gold should be placed on the other side to balance this quantity of silver? Atoms to Atoms? How would I convert that. It's kind of live a division problem too but how to ...
October 19, 2015

Chemistry
12.) If 4.75 * 10^23 atoms of silver are placed on one side of a platform balance, how many atoms of gold should be placed on the other side to balance this quantity of silver? Atoms to Atoms? How would I convert that. It's kind of live a division problem too but how to ...
October 19, 2015

chemistry
1.) Here is what I did. 1.500 carat diamond (C) * (200.0 mg C/1 caret diamond C) * (1 g C/ 1,000 mg C) *( 1 mol C / 12.011 g C) * (6.022*10^23 atoms C/ 1 mol C) Sorry its confusing when you type it
October 19, 2015

chemistry
Here are my answers after I figured it out. Are these correct though? 1.) 1.50 *10^25 atoms C 2.) 5.173 *10^23 atoms Mg
October 19, 2015

chemistry
1.) How many carbon atoms are contained in a 1.500 carat diamond (carbon) if 1 caret =200.0 mg? _____________________________ I don't know if I'm doing this right but I tried. Can someone help? 1.500 carat diamond (C) *(200.0 mg/1 caret) ... ...
October 19, 2015

AP Chem (Thank you for help)
Thank you. I got 2 and 3, but I still don't understand how to balance the first one. Can you offer any help with that? Also, if you could, could you check my last problem? I'm sorry, and thank you!
October 17, 2015

AP Chem (Thank you for help)
Hey guys! Stuck on some Redox Reactions. I tried my best to put as much work as I could, but I'm super stuck on these ones. Thanks for any help: 1) Balance the equation as written, what is the coefficient for O2? NH4+ + O2-->NO2− + H2O (in basic solution) Maybe ...
October 17, 2015

AP Chem
Hey guys! Thanks for any help in advance! I'm back with this problem: Calculate the percent dissociation for a 1.00 × 10-6 M solution of HCN at 25 °C. Ka = 4.90 × 10-10. So my question really is do I have to use water when I calculate the percent ...
October 12, 2015

math
112.5 = 1x
October 12, 2015

Accounting
In its first month of operations, Giffin Company made three purchases of merchandise in the following sequence: (1) 260 units at $5, (2) 360 units at $7, and (3) 460 units at $8. Assuming there are 160 units on hand at the end of the period, compute the cost of the ending ...
October 12, 2015

AP Chem
Thanks for the help! Sorry about D; I've never experiences a problem like that before. I guess I have a question about D. I understand that k2 is a lot smaller than k1, but since you get a different answer when doing the second ionization doesn't that mean that it is ...
October 10, 2015

AP Chem
Hey guys! Stuck on some pH problems! Thanks so much in advanced: A) Calculate the pH of a 0.200 M solution of potassium acetate, KCH3CO2, in water at 25 °C. At this temperature, Ka = 1.76 × 10-5 for acetic acid. 1. 2.73 2. 5.45 3. 9.02 4. 9.94 5. 10.16 6. none of ...
October 10, 2015

AP Chemistry
Hey guys stuck again! Bromine and chlorine dissolve in carbon tetrachloride and react to form BrCl: Br2 + Cl2--> 2BrCl (in CCl4) Under equilibrium conditions [Br2] = [Cl2] = 0.00430 M and [BrCl] = 0.0114 M. The addition of 0.100 moles of Br2 to exactly one liter of this ...
October 9, 2015

AP Chemistry
Sorry! Here: ICE Table N2O N2 O2 .2M 0M 0M -2x 2x x .2-2x 2x x Kc=[N2]^2[O2]/[N2O]^2 3.5*10^-18=[2x]^2[x]/[.2-2x]^2 0=-4x^3+1.4*10^-17x^2 -2.8*10^-18+1.4*10^-19 I then graphed this cubic and my x was actually 3.3*10^-7 I plugged that x into 2x to get 6.6*10^-7, which is none ...
October 8, 2015

AP Chemistry
Hey guys! Stuck on another one: The reaction 2N2O(g) 2N2(g) + O2(g) has Kc = 3.5 × 10-18 at a particular temperature. If 0.20 mol of N2O is placed in a 1.00 liter container, what will be the N2 concentration when equilibrium is reached? 1. 4.4 × 10-9 mol/liter 4. 3...
October 8, 2015

AP Chemistry
That makes sense! Just wanted to say thanks!
October 8, 2015

AP Chemistry
Hey guys! Stuck on some problems: 1)Consider the following chemical reaction between gases: 2N2O(g) + O2(g)->4NO(g) + heat The amount of O2 at equilibrium will be decreased by: 1. Adding more NO(g). 2. Increasing the pressure by decreasing the volume. 3. Removing N2O. 4. ...
October 8, 2015

AP Chemistry
Hey guys! Thanks in advance for help! Confused on a question: If the rate=k[NO]^2[Br2], and the concentration of Br2 is doubled, what happens to the rate? Maybe Answer: Maybe the rate would increase by a factor of two?
October 1, 2015

Advanced Placement Chemistry
I just wanted to say thanks for all your help! I'm still thinking about what to do for seven, but you make a good point. Your way makes more sense than mine did! Thanks again! You're amazing!
September 24, 2015

Advanced Placement Chemistry
For 7, this my thinking: Molality of solution: 5.63 g CdBr2 / 272.2 g/mol = 0.0207 mol / 0.1 kg water = 0.207 m 0.54C = i (1.86) (0.207) i = 1.4 If CdBr2 was completely dissociated, i would be 3. If it was a non-electrolyte, i would = 1. So I guess that's why I think it is...
September 24, 2015

Advanced Placement Chemistry
I'm so sorry! I didn't even think of that, but I will do that next time! I don't understand number 1, does BF3 have a zero dipole moment? Do the others look okay? Thanks so much!!!
September 24, 2015

Advanced Placement Chemistry
Hey guys! Stuck on some review problems: (My maybe answers are at the end) 1)Which of the following molecules has a nonzero dipole moment? A. CO2 B. H2 C. C12 D. CH4 E. BF3 F. None of the above has a nonzero dipole moment 2) Which of the following would you predict to have the...
September 24, 2015

AP Chemistry
Hey guys! I'm stuck on some study guide problems... (On the bottom of this, I put what answers make sense to me) A) A factor that affects the speed of heterogeneous reactions but not of homogeneous reactions is 1)nature of reactants 2)concentration of reactants 3)area of ...
September 23, 2015

AP Chemistry
Hey guys! What is the rate constant is particularly sensitive to: 1 A change in volume 2 A change in pressure 3 A change in product concentration 4 A change in reactant concentration 5 A change in the activation energy I feel like it is a change in the activation energy b/c ...
September 20, 2015

AP Chemistry
Hey guys! I'm really lost on this equation. Any help? H2(g) yIelds 2H(g)   Delta  H = 436 kJ/mol F2(g) yields  2F(g)             DeltaH = 158 kJ/mol H(g)  + F(g) yields HF(g)  &...
September 19, 2015

physics
In the (Figure 1) the coefficient of static friction between mass mA and the table is 0.42, whereas the coefficient of kinetic friction is 0.17. Ignore masses of the cord and the (frictionless) pulley. What minimum value of mA will keep the system from starting to move? What ...
September 10, 2015

Chemistry
Hi guys! I just learned about significant figures today, and I have a question about them. My teacher gave us a problem where all values have what I think is four significant figures (like 44.56) except the value for temperature (which is 25.5C). Are temperature values ...
September 9, 2015

Algebra
Nope^^ you convert all the units to inches first!!!!
September 9, 2015

Chemistry
Okay thank you! :)
August 14, 2015

Chemistry
For the reaction ? Li+? N2 →? Li3N , what is the maximum amount of Li3N which could be formed from 11.79 g of Li and 17.08 g of N2? I got 19.72 g as my final answer and I just want to make sure I am correct. If I am not can you please help me understand this problem?
August 14, 2015

Algebra
For the following sequences determine the term indicated: a_1=-2, a_n=2(a_n-1)^2,a_4 a_n=ln(e^n+2), a_5 b_0=1, b_1=2, b_n+1=2b_n-b_0
May 4, 2015

Chemistry
How much heat is absorbed by a 2966 kg granite boulder as energy from the sun causes its temperature to change from 3°C to 31°C? 1000 g = 1 kg
May 3, 2015

math
a person had to drive 1417 miles. They drove 9 hours a day for 3 days. How many miles per hour did they drive?
April 30, 2015

calculus trig substitution
∫ x^3 √(x^2+9) dx If you work it can you write the steps? I really don't like the way my teacher teaches it. Someone else doing it might help.
March 14, 2015

physics
The tortoise and the hare agree to a race. Of course, they are racing cars, having gotten tired of racing on foot. The tortoise, having just bought a new Mercedes AMG GT, allows the hare to have a running start in his Volkswagen Rabbit. The hare starts the race by getting up ...
February 15, 2015

physics
A sprinter in a race can run 100m in 11.4 seconds. If it takes him 4.2 seconds to accelerate to top speed, what is the magnitude of his acceleration? Assume that he stays at his top speed from 4.2 seconds till the end. I do not understand which kinematics equation will help, ...
February 15, 2015

math
how do I translate this sentence into an equation. 51 is the product of Malik's height and 3 . Use the variable m to represent Malik's height
February 13, 2015

algebra
diana drove 320 miles, then increased her speed by 10 miles per hour for 500 miles. if the second part of the trip took 2 hours longer than the first, find her average speed.
February 11, 2015

physics
What potential difference is needed to stop an electron having an initial speed of 3.70x 105 m/s? Answer in volts
January 29, 2015

physics
The three charges in the figure are at the vertices of an isosceles triangle. Calculate the work that needs to be expanded, in Joules, to bring the charges together (as shown.) Take q=5.7 μC. The length of base is b=2.30 m. The lengths of sides are s=5.80 m. The two ...
January 28, 2015

math
Karen collects local and foreign coins. of the coins in her collection, 1/4 are foreign coins. Of the foreign coins,2/5 are from mexico What fraction of the collections are foreign coins that are not from mexico?
January 12, 2015

alegbra 1
so its letter d
January 11, 2015

Algebra 1
Where would the system below intersect on a graph? y=12x+15 y=15x I know that: x=5 y=75 But I need help on how to graph it.
January 9, 2015

Physics 11
A 1.00 x 10^4 W electric motor is used to lift a 955 kg object vertically 25.0 m at a constant velocity in 45.0 s. What is the efficiency of the motor? I did P=W/t (1.00x10^4 x 45 =W) And got 4.50 x 10^5 Then I did Ep' = Ek 955 x 9.81 x 25 = 234213.75 But I wasn't sure...
January 4, 2015

English
I have this question on my homework to find six pieces of figurative language and six pieces of symbolism for the book The Barcode Tattoo by Suzanne Weyn. I could only find two though- the barcode and the Whiteface Mountain. Please help. Your help is very much appreciated. -...
December 10, 2014

chemistry
Write out the mechanism (using correct curved arrow notation) for the acid-catalyzed, cis-trans isomerization of maleic acid (into fumaric acid) If teh electrophilic addition reaction of maleic acid with HCl had gone to completion what would be the structure of the addition ...
December 3, 2014

Chemistry
Assign the two absorptions found above 3000 cm-1 in acetamide. Why are these absorptions missing in n,n-dimethylacetamide
October 8, 2014

Math
how do i get 3 cups of flour if i only have 9 cups
September 19, 2014

statistics
In order to subject their cash registers to random audit, suppose we want to select a random sample of three people from this group of cashiers. Bonita, Chandra, Earl, Glenda, Homer, Jamal, Kendra, Maria, Oscar, Reshonda. How do I use a random number table?
July 30, 2014

Biology
A strand of DNA contains the following bases. ATT CCG GGA TTT a) what amino acids are coded for? First of all, would the mRNA strand be UAA GGC CCU AAA?
May 18, 2014

science
Sem and tem microscope
May 7, 2014

Algebra I
what does factoring the sum or difference of two cubes mean
May 4, 2014

Calculus Help Please Urgent!!!
Yeah.
May 1, 2014

Pre algebra
A bag of balloons contain 2 red balloons, 1 green balloon, 17 yellow balloons, and 8 orange balloons. What is the probability that a randomly selected balloon would be green or orange? I got 9/28, but I think that's wrong
April 30, 2014

MATH UGH WORD PROBLEM
3.14 (r squared)40 =
April 1, 2014

Chemistry
If 0.08 mol of LiCl is added to a one liter solution that has dissolved 0.01 mol of PbCl2, will a precipitate occur?
March 4, 2014

algebra
The rack of weight plated at the fitness center has a total of 148 plates weighing 2.5,5,and 10 pounds each. The total weight is 500 pounds. There are ten times as many 5 pound plates as 10 pound plates. Set up a matrix equations and then solve it to determine the number of ...
December 16, 2013

physics
in other terms of units, what is a joule equal to? a)N*m b)N/m c)W/s d)s/W e)N*s
December 10, 2013

science
I need an acrostic poem for the element Sodium?? puhleez?! THANX!!!
December 7, 2013

Lit
how does mark twain show racism and slavery in huckleberry fin? thanks!
December 3, 2013

World History
For my research project, I need to choose an absolute monarch. I want to do one on  a monarch/emperor/king from Vietnam because I have Vietnamese origins and am interested in learning more about its history. Is there any well known Vietnamese absolute monarchs? Thank you
November 19, 2013

Grade 12 Physics
For this question my answer keeps on coming to 25m/s but answer is 28.
November 18, 2013

Math
I'm sorry I'm trying to get my own help. Any good webs?
November 4, 2013

Math
I don't know. :T
November 4, 2013

Science
Explain what acids and bases are in terms of hydrogen ions. Which has more hydrogen ions and which has less?
October 29, 2013

physics
the moon has a period of 27.3 days and a mean distance of 3.90x10^8 m from the center of the earth. find the period of a satellite in orbit 6.7x10^6 m from the center of earth. thank you!
October 26, 2013

religion/theology
i have to make a prayer video and i dont know what to make it about, please help! thank you
October 12, 2013

CHEMISTRY
Given that Mg(ClO3)2 decomposes into magnesium chloride and oxygen: A) Write a balanced equation for this reaction. I got Mg(ClO3)2 yields MgCl2 + 3 O2 Is that right? B) If 0.302 grams of O2 is lost from 1.890 grams of a mixture of Mg(ClO3)2 and an inert material, what is the ...
September 30, 2013

CHEMISTRY
Given that Mg(ClO3)2 decomposes into magnesium chloride and oxygen: A) Write a balanced equation for this reaction. I got Mg(ClO3)2 yields MgCl2 + 3 O2 Is that right? B) If 0.302 grams of O2 is lost from 1.890 grams of a mixture of Mg(ClO3)2 and an inert material, what is the ...
September 30, 2013

Lit
in the scarlet letter what influence did the witches have on pearl thanks!
September 10, 2013

lit
yea i had to read the book over the summer but my teacher wants us to find a celebrity that kinda represents them. like how lindsey lohan is like a pearl
September 9, 2013

lit
im doing a character analysis and i need help on what celebrity is like hester and one like pearl
September 9, 2013

Writing
Can you proofread my essay? Life in the Fast Lane Have you ever changed so much in life that you couldn’t possibly bare it? Well, that person is called a dynamic character, someone who changes throughout a drama. In the drama, “The Crucible,” by Arthur Miller ...
September 7, 2013

history
why is the columbian exchange and pilgrims important to the U.S history? thank you!
September 4, 2013

theology
WHO IS saint. cecilia?
August 31, 2013

Lit
thank you so much!!
August 25, 2013

algebra
It's a difference of two squares. It'll be (x+sqrt(4)) and (x-(sqrt(4)), for example---replacing 4 with whatever number is being subtracted from x squared. That one is (x-2)(x+2). Another example: x^2-16 = (x-4)(x+4) You can even do this: x^4-16 = (x^2-4)(x^2+4)
August 25, 2013

Writing
Can you proofread my essay and I also need a good title? Christopher Columbus was a brave, strong, hard-worker who took sea to America in 1470. What is biased? Biased is your opinion or idea on someone. In Christopher Columbus journal excerpt, there were many examples of how ...
August 24, 2013

math
In a class of 80 seniors, there are 3 boys for every 5 girls. In the junior class, there are 3 boys for every 2 girls. If the two classes combined have an equal number of boys and girls, how many students are in the junior class?
July 9, 2013

theology
there are no variations within the catholic liturgy. all liturgy is identical worldwide. true or false?
May 27, 2013

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