# Posts by Allie

Total # Posts: 421

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

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

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) ... ...

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!

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 ...

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 ...

math
112.5 = 1x

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 ...

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 ...

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 ...

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 ...

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 ...

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...

AP Chemistry
That makes sense! Just wanted to say thanks!

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. ...

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?

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!

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...

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!!!

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...

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 ...

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 ...

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)  &...

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 ...

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 ...

Algebra
Nope^^ you convert all the units to inches first!!!!

Chemistry
Okay thank you! :)

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?

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

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

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?

Math.
5: is c, not d

social studies
thank you kat i got 100%!

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.

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 ...

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, ...

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

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.

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

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 ...

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?

algebra 1
so its letter d

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.

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...

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. -...

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

Algebra 1B
1. C - 30.25 2. B - x = -1 3. D - no solution 4. B - 8 in. I just took the assessment and got 4/4.

Chemistry
0.212 g CuO

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

Math
how do i get 3 cups of flour if i only have 9 cups

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?

social studies (check plz)
the weekend is wrong the real answer are B C A D C D D C C A 100% true i promise

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?

ALGEBRA
Anonymous and Margaret are right

science
Sem and tem microscope

Algebra I
what does factoring the sum or difference of two cubes mean

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

MATH UGH WORD PROBLEM
3.14 (r squared)40 =

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?

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 ...

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

science
I need an acrostic poem for the element Sodium?? puhleez?! THANX!!!

Lit
how does mark twain show racism and slavery in huckleberry fin? thanks!

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

For this question my answer keeps on coming to 25m/s but answer is 28.

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

Math
I don't know. :T

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

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!

religion/theology
i have to make a prayer video and i don't know what to make it about, please help! thank you

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 ...

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 ...

Lit
in the scarlet letter what influence did the witches have on pearl thanks!

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

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

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 ...

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

theology
WHO IS saint. cecilia?

Lit
thank you so much!!

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)

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 ...

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?

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

math
Part 1: Write two conditional statements for which the converse is true. 1. Statement: 2. Converse: 3. Statement: 4. Converse: Part 2: Write two conditional statements for which the converse is false. 5. Statement: 6. Converse: 7. Statement: 8. Converse:

math
simplify sin(540-2x) this is to do with trig

Trig
Verify the identity. (secx + tanx)/(secx - tanx) = (1 + 2sinx + sin(^2)x)/cos(^2)x

maths
find the general solution for the equation: sin2x+ square root 3cosx =0

ENGLISH ELA :D
So, like, what you like, have to like, do is like, look back in like, whatever reference you, like, have. If you like, have a play sheet or something look back in, like, there. If you don't, like, watch the play or something..I dunno how to, like, help you.

english
a dolls house questions: what religious themes do you see in the play? What is the significance of Nora’s words, “to hell and be damned” in Act I? Was Nora wrong to have acquired the money for the trip to save Torvald’s health? What elements of Nora and ...

Algebra
The stem-and-leaf plot represents the average monthly high temperatures in Tampa, Florida. What is the first quartile (Q1) of the temperatures? Round to the nearest tenth. Stem leaf 6 9 7 1267 8 14799 9 00

Math
Does this set of data have any outliers? Data: 1, 2, 2, 4, 6, 6, 7, 8, 9, 10, 12, 13, 16, 16, 18. no or yes

Algebra
The data below represents the average score per game of the top 40 NBA players, rounded to the nearest whole number. Find the minimum, Q1, median, Q3, maximum for the data. Stem l leaf 1 l 55667777888888899 2 l 00000011123445566679 3 l 135

AP Chemistry
yea you're right!

english
Just took this test and got 100% the answers are, rhetorical criticism and structure

College Statistics
A random variable X has a Gamma distribution with (alpha = a, beta = b). Show that P(X > 2ab) < (2/e)^a. hint: X > c is equivalent to e^Xt > e^ct

Math
the answers are A D A B A

Chemistry
How many liters of hydrogen gas can be produced at 300.0K and 1.55atm if 20.0g of sodium metal is reacted with water?

Chemistry
How many liters of hydrogen gas can be produced at 300.0K and 1.55atm if 20.0g of sodium metal is reacted with water?

science
I just wish that people could post a helpful answer, Translational motion is movement of an object without a change in its orientation relative to a fixed point, as opposed to rotational motion, in which the object is turning about an axis. With that in mind a leaf blowing ...

1. Pages:
2. <<Prev
3. 1
4. 2
5. 3
6. 4
7. 5
8. Next>>