Thursday
December 8, 2016

Posts by Jessie

Total # Posts: 721

stat
In an extensive study involving thousands of British children, Arden and Plomin (2006) found significantly higher variance in the intelligence scores for males than for females. Following are hypothetical data, similar to the results obtained in the study. Note that the scores...
November 26, 2016

Social Studies
what did hatshepsut do as pharaoh of Egypt?
November 17, 2016

math
2 1/8 divided by 3 1/4= a.68/104 b.221/32 c.17/26 d.6 29/32
November 10, 2016

Spanish
Instructions: Modifique el párrafo por cambiar las palabras entre comillas al tiempo FUTURO. Modelo: Mi familia ‘va a visitar’ a nuestros abuelos este verano. Mi familia visitará a nuestros abuelos este verano. 1. Este año ‘vamos a hacer&#...
November 6, 2016

Pre Cal help please!!
given f(x) = { 2x^2 + 5 x < or equal to 2 3 - x^2 x > 2 find lim f(x) x -> 2^+ lim f(x) x -> 2^- lim f(x) x -> 2
October 1, 2016

Chemistry AP
I know that the answer is not A... can anyone help me any further?
September 20, 2016

Chemistry AP
The equilibrium constant for the formation of phosphorus pentachloride is 1.9. If the partial pressure of each gas is 0.5 atm, will the reaction (as written) proceed forward or backward to reach equilibrium? PCl3(g) + Cl2(g) PCl5(g) A. Forward, because K is greater than Q B. ...
September 20, 2016

ap chemistry
Which of the following statements about the pH scale is not true? A. In a pH expression, the hydronium ions, H3O+, can be abbreviated simply as H+. B. A solution with a pH of 4 has twice the [H+] of a solution with a pH of 2. C. The pH scale is based on a scale involving ...
September 15, 2016

ap chemistry
When are more products of a reaction available initially than at equilibrium? A. K = 0 B. Q < K C. Q = K D. Q > K
September 15, 2016

chemistry
When are more products of a reaction available initially than at equilibrium? A. K = 0 B. Q < K C. Q = K D. Q > K
September 12, 2016

chemistry
Given the following solubility constants, which list arranges the solutes in order of increasing solubility? CaCO3: Ksp = 2.8 × 10-9 Ca(OH)2: Ksp = 5.5 × 10-6 CaSO4: Ksp = 9.1 × 10-6 CaF2: Ksp = 5.3 × 10-9 A. CaSO4 < Ca(OH)2 < CaCO3 < CaF2 B. ...
September 12, 2016

chemistry
Given the equilibrium concentrations in the table, what is the equilibrium constant for the synthesis of ammonia at this temperature? 3H2(g) + N2 2NH3(g) A. 0.0035 B. 0.014 C. 0.066 D. 0.017
September 12, 2016

chemistry
What change do you expect if the value of the reaction quotient is greater than the value of the equilibrium constant? A. The rate of the forward reaction is greater than the rate of the reverse reaction. More reactant forms. B. The rate of the forward reaction is greater than...
September 12, 2016

chemistry
Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base dissociate into their ...
September 12, 2016

chemistry
What does a buffer do? A. It resists a change in pH when H+ or OH- is added to a solution. B. It prevents an acid-base reaction from happening. C. It prevents an acid or base from being neutralized. D. It prevents a salt from forming in solution.
September 12, 2016

chemistry
Why is HCl required in the stomach? A. To transport proteins into the small intestines B. To help absorb other acids in the stomach C. To catalyze the digestion of carbohydrates D. To aid in the digestion of proteins
September 12, 2016

chemistry
The [OH-] ion concentration of a sample is 1 × 10-10 M. What is the concentration of [H+] in the sample at 25°C? A. 1 × 10-14 M B. 1 × 10-4 M C. 1 × 10-10 M D. 1 × 10-6 M
September 12, 2016

chemistry
Which of the following chemical reactions represents a neutralization reaction? A. CH4 + 2O2 CO2 + H2O B. HCl + NaOH H2O + NaCl C. NH3 + H2O NH4++ OH- D. CH3COOH + H2O CH3COO- + H3O+
September 12, 2016

chemistry
Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base dissociate into their ...
September 11, 2016

chemistry
What is the general form for the simplest type of acid-base reaction? A. acid + base salt + water B. acid + base base + acid C. acid + base H+ + OH- D. acid + base solid + water
September 11, 2016

chemistry
A, B, C, and D are 4 salts whose Ksp values are 9.21 × 10-8, 7.44 × 10-11, 1.07 × 10-21, and 38.65, respectively. What is the correct arrangement of their solubilities in decreasing order? A. D, A, B, C B. C, B, A, D C. A, B, D, C D. C, B, D, A
September 11, 2016

chemistry
Acetic acid is known to be a weak acid. What will happen to the acidity of the solution when sodium acetate is added to acetic acid? A. The solution will become more acidic. B. The pH will remain the same. C. The solution will become less acidic. D. The solution will become ...
September 11, 2016

chemistry
Which of the following bases could you write an equilibrium expression for? A. Ba(OH)2 B. KOH C. NaOH D. NH3
September 11, 2016

chemistry
During a chemical reaction, if Q = K, what can be said about the reaction? A. The reaction still proceeds in both directions, but the net result is that the reactant and product concentrations do not change. B. The amount of product is always equal to the amount of reactant. C...
September 11, 2016

chemistry
Which of the following is true of the solubility product constant? A. It is the product of the initial concentrations of the ions in a solution. B. It is an equilibrium constant. C. It is an equilibrium position. D. Its value changes in the presence of a common ion. Hi, I know...
September 11, 2016

chemistry
Which equation would describe the following equilibrium constant? Kc = [Bi3+]2[S2-]3 A. Bi2S3(s) + 6HCl(aq) 2BiCl3(aq) + 3H2S(aq) B. Bi2S3(s) 3Bi2+(aq) + 2S3-(aq) C. BiS(s) Bi3+(aq) + S2-(aq) D. Bi2S3(s) 2Bi3+(aq) + 3S2-(aq)
September 11, 2016

chemistry
What happens to the following reaction at equilibrium if the pressure is decreased? 2H2(g) + O2(g) 2H2O(g) A. The equilibrium shifts left because Q < K. B. The equilibrium shifts right because Q < K. C. The equilibrium shifts right because Q > K. D. The equilibrium ...
September 11, 2016

chemistry
What is the equilibrium expression for the change when iron(II) chloride dissolves? FeCl2(s) Fe2+(aq) + 2Cl-(aq)
September 11, 2016

science ap chemistry
What is the equilibrium expression for the following acid dissociation reaction? CH3COOH + H2O CH3COO- + H3O+ A. [CH3COO-][H3O+]/[CH3COOH][H3O] B. [CH3COOH][H2O]/[CH3COO-][H3O+] C. [CH3COOH]/[CH3COO-][H3O-] D. [CH3COO-][H3O+]/[CH3COOH]
September 10, 2016

math homework
use the limit process to find the slope of the graph of 'square root' x+8 at (8,4) a. 4 b. 1/4 c. the slope is undefined at this point d. 1/8 e. infinity
August 31, 2016

math
solve the system of equations for x and y { x^2 - 11x -y =-24 x^2 - 11x + y = -24
August 31, 2016

maths
evaluate the expression (94) (93) a. 94 b. 93 c. 1 d. 88 e. -5
August 31, 2016

maths
find the area of the parallelogram that has the vectors as adjacent sides u = -2i + j + 5k v = 4i - 3j - 3k a. 11 b. squareroot 26 c. 86 d. 2 squareroot 86 e. 1
August 30, 2016

math homework help please?!!
determine lim f(x) x -> 1 where f(x) = { 13 - x^2, x < or equal to 1 11 - x, x > 1 a. 11 b. limit does not exist c. 13 d. 10 e. 12
August 30, 2016

Rainy can you help me with this question?!
find the values of x and y that will make the matrix equal [x y] 1 9 = [3 5] 1 9 the answer options are a. x=-3 y=-5 b. x=5 y=3 c. x=-3 y=5 d. x=3 y=5 e. no solution
August 30, 2016

chemistry
What is the equilibrium expression for the following acid dissociation reaction? CH3COOH + H2O CH3COO- + H3O+ A. [CH3COO-][H3O+]/[CH3COOH][H3O] B. [CH3COOH][H2O]/[CH3COO-][H3O+] C. [CH3COOH]/[CH3COO-][H3O-] D. [CH3COO-][H3O+]/[CH3COOH]
August 22, 2016

chemistry
A reaction has an equilibrium constant very much less than 1. Will the reaction proceed spontaneously? A. Yes, because products are favored and deltaG° < 0. B. Yes, because reactants are favored and deltaG° > 0. C. No, because reactants are favored and deltaG°...
August 22, 2016

chemistry
If the equilibrium constant is much less than 1, how can you tell where the equilibrium lies? A. Reactants are in the numerator of the equilibrium expression, so equilibrium lies toward the reactants. B. Products are in the numerator of the equilibrium expression, so ...
August 22, 2016

chemistry
What information does an equilibrium constant give about a reaction? A. It tells how long it takes the reaction to reach equilibrium. B. It tells how much energy is required for the reaction to happen. C. It tells what the rate constant of the reaction is at equilibrium. D. It...
August 22, 2016

chem
Under constant pressure, a system of gases is sealed in a cylinder and then allowed to expand. What can you conclude about the work associated with this change? A. Work is negative and is done to the system. B. Work is negative and is done by the system. C. Work is positive ...
August 20, 2016

chem
Knowing what information would allow you to order gas molecules according to their velocity? A. Pressure and temperature B. Volume and molecular mass C. Pressure and volume D. Temperature and molecular mass
August 20, 2016

science
Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the reactants D. The rate ...
August 20, 2016

please help with this trigonometric identity!
verify this trigonometric identity cos 'a' - cos 'b' / sin 'a' + sin 'b' + sin 'a' - sin 'b' / cos 'a' + cos 'b' = 0 please help me with this! i don't know how to do it!
August 19, 2016

Chem
Knowing what information would allow you to order gas molecules according to their velocity? A. Pressure and temperature B. Volume and molecular mass C. Pressure and volume D. Temperature and molecular mass
August 19, 2016

chemistry help?!
Which properties result from minimal interactions between molecules in a gas? A. A characteristic geometric shape and limited particle motion B. A random shape, limited particle motion, and inability to be compressed C. A random shape, significant particle motion, and ability ...
August 19, 2016

chemistry help
How do forces determine the shape of a protein? A. The covalent bonds in the protein determine the shape of the protein. B. The protein folds into complex shapes through intermolecular forces. C. Polar parts of a protein are repelled by water. D. Hydrophobic parts of a protein...
August 19, 2016

them
How do intermolecular forces determine the vapor pressure of a liquid? A. A nonpolar compound has a low vapor pressure because of London dispersion forces. B. A compound that can form hydrogen bonds has a low vapor pressure. C. A polar compound has a high vapor pressure ...
August 19, 2016

Chem
So is it just IV?
August 19, 2016

Chem
Which of the following statements is (or are) true? I Hydrogen bonds occur between two hydrogen atoms. II Hydrogen bonding occurs between a hydrogen atom and an oxygen atom within a molecule. III Hydrogen bonding requires a molecule containing a large atom. IV Hydrogen bonding...
August 19, 2016

chemistry help?!
so is it d ?
August 19, 2016

chemistry help?!
Which statement correctly pairs the order of a reaction with the units for the rate constant? A. third order; s/M B. zero order; 1/(M2) C. second order; 1/(M•s) D. first order; 1/M
August 19, 2016

chemistry help?!
Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the reactants D. The rate ...
August 19, 2016

Steve help please?!?!
How many moles of oxygen are produced from the decomposition of 36.7 g of dinitrogen pentoxide? 2N2O5 4NO2 + O2 A. 3.19 mol B. 0.340 mol C. 0.170 mol D. 5.44 mol Hi Steve, I posted this question the other day but really don't know how to answer it. Can you walk me through ...
August 19, 2016

chemistry
Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the reactants D. The rate ...
August 18, 2016

Science - Chemistry
If the rate law of a chemical reaction is k[NH4+]2[NO2–], what is the order of the reaction? 1. The order of the reaction cannot be determined. 2. 3 3. 1 4. 2
August 18, 2016

Chem
So that would be answer A correct?
August 18, 2016

Chem
During which stroke of a four-stroke internal combustion engine is the system's temperature raised because work is done to the gases? A. Compression stroke B. Power stroke C. Exhaust stroke D. Intake stroke
August 18, 2016

Chem
_____________ are a type of intermolecular force that _____________ . A. London forces; occur between permanent dipoles B. London forces; are the attractive forces between all molecules due to instantaneous dipoles C. Hydrogen bonds; are weaker than dipole-dipole forces D. ...
August 18, 2016

Them
I don't know. Please help me figure it out!!
August 18, 2016

Them
How many moles of oxygen are produced from the decomposition of 36.7 g of dinitrogen pentoxide? 2N2O5 4NO2 + O2
August 18, 2016

Calculus
What are the zeroes of the polynomial equation, 𝑦 = 𝑥3 + 3𝑥2
August 17, 2016

Chemistry
An antifreeze solution is prepared containing 40.0 g of ethylene glycol (molar mass = 62.0 g/mol) in 60.0 g of water. Calculate the freezing point of this solutions A.-20.1°C B.0.518°C C.20.1°C D.120.1°C
July 30, 2016

math
what is 875 multiplied by 3/2?
May 25, 2016

World History
Winning which World War II battle allowed the Allied forces to protect strategic locations for trade and resources in the Mediterranean region? Battle of El Alamein**** Battle of Stalingrad Battle of Britain Battle of Midway
May 14, 2016

Chemistry
How many grams of sodium sulfate na2so4 must be added to make 500ml of a 12.5 M sodium sulfate solution
May 10, 2016

English II
Is it A?
May 9, 2016

English II
From the three windows, through the cracks of the old wooden shutters, came only a few scattered sunbeams which, in the midst of the obscurity, made a soft brightness that bathed surrounding objects in a diffused and tender light. Which word, if substituted for "diffused&...
May 9, 2016

English II
I think its A
May 9, 2016

English II
Standing before the press which faced the windows, Dr. Pascal was looking for a paper that he had come in search of. With doors wide open, this immense press of carved oak, adorned with strong and handsome mountings of metal, dating from the last century, displayed within its ...
May 9, 2016

English II
Okay, I was leaning more towards A. Thank you!
May 9, 2016

English II
Marc Antony's Speech from Shakespeare's Julius Caesar Friends, Romans, countrymen, lend me your ears; I come to bury Caesar, not to praise him. The evil that men do lives after them; The good is oft interred with their bones; So let it be with Caesar. The noble Brutus ...
May 9, 2016

English II
Thank you!
May 9, 2016

English II
Friends, Romans, countrymen, lend me your ears; I come to bury Caesar, not to praise him. The evil that men do lives after them; The good is oft interred with their bones; So let it be with Caesar. The noble Brutus Hath told you Caesar was ambitious: If it were so, it was a ...
May 9, 2016

English II
@Mrs. Sue?
May 9, 2016

English II
So, would it be A?
May 9, 2016

English II
Read the following passage and answer the questions that follow: Doctor Pascal by Emile Zola In the heat of the glowing July afternoon, the room, with blinds carefully closed, was full of a great calm. From the three windows, through the cracks of the old wooden shutters, ...
May 9, 2016

English II
reason for the lady’s journey beginning of the lady’s journey destination of the lady’s journey end of the lady’s journey it could actually be either a or c.. I know it isn't d
May 4, 2016

English II
from "The Lady of Shalott" by Alfred, Lord Tennyson In the stormy east-wind straining, The pale-yellow woods were waning, The broad stream in his banks complaining, Heavily the low sky raining Over tower'd Camelot; Down she came and found a boat Beneath a willow ...
May 4, 2016

English II
Read the passage and answer the question that follows: Despite our best efforts as parents, we will always make mistakes in raising our children. It's inevitable. There are so many decisions to be made in any given day, week, month, or year. It's an inhuman task to ...
May 4, 2016

English II
I was leaning more towards A. Thank you! :)
May 4, 2016

English II
Read the passage and answer the question that follows. Chief Joseph's Surrender Speech, October 5, 1877 by Chief Joseph Tell General Howard I know his heart. What he told me before, I have it in my heart. I am tired of fighting. Our Chiefs are killed; Looking Glass is dead...
May 4, 2016

World History
Just so everyone knows, 7, 8, and 9 are wrong
April 25, 2016

World History
What immediate effect will the pieds-noirs have on these native Algerians' lives? A. They will become factory or commercial farm workers.****** B. They will be forced to fight for their freedom. C. They will relocate to France and learn modern skills. D. They will gain an ...
April 25, 2016

Math
😭😭😭😭😭😭ORDER OF OPERATIONS!!!!!!😰😰😥😪🤔(9+22-2^2)divided by (9-7)
April 18, 2016

Spanish
Hello, would anyone be willing to check several of my answers? Teresa _______ dio una camara a mi. me le nos <<< os Mi Tio Isaac ______ planes (Plans) para ir a Mexico. hicieron hiciste hizo<<< hicimos Teresa y yo siempre _____ la verdad. digo decimos<<...
April 18, 2016

Chemistry
In 2006, Soviet dissident Alexander Litvinenko was murdered when Polonium-210 was added to his tea; he died three weeks later. Polonium-210 is an alpha emitter. What other product is formed?
April 7, 2016

English, Please help me correct the grammar
House and Lot for sale. With 2 rooms on the 2nd floor and own toilet. 1room on the ist floor. Lot area 80 square meter. Total Price pesos 500k negotiable 2 rooms are being rented with tenants for monthly rent. Reason, I'll be leaving for abroad and no one will look after ...
April 5, 2016

World History: Check Please!
Look at the prompt for this unit: Was Brutus a betrayer or a patriot? and write a one-sentence statement of your claim. Then write two or three examples of counterclaims to your argument. Provide specific examples from the play to support your claim. Use proper spelling and ...
March 29, 2016

Geometry (check)
You are correct, it is D F = 12, V = 10 V - E + F = 2 10 - E + 12 = 2 -E + 22 = 2 -E = -20 E = 20
March 29, 2016

Statistics
An IQ is measured with scores that range from 0-200. The means is 100, the standard deviation is 15. Suppose you choose an SRS of 9. What is the probability that the sample will have an average IQ between 105 and 115?
March 26, 2016

Statistics
Use the following information to answer the following questions. IQ is measured with scores that range from 0-200. Thea mean is 100 and the standard deviation in the population is 15. What is the probability that a randomly chosen person has an IQ of 115? Suppose you have a ...
March 26, 2016

Geometry
Updated work: M=dv v=359,189 d=0.000011142 m≤359189×0.000011142 m≤4.002083838 Since we already know the density and volume of the tank, we need to find the mass. The formula to find the mass of an object is density time volume. When you multiply the density ...
March 12, 2016

Geometry
3.In step 1, you found the volume (in cubic feet) of the main tank. If the maximum density of killer whales per cubic foot is 0.000011142, what is the maximum number of killer whales allowed in the main show tank at any given time? You must explain your answer using words, and...
March 12, 2016

English
Thank you so much! :)
March 4, 2016

English
Fix the sentence by following the apostrophe rule. Strong childrens education is essential to the progress of any nation a. Strong childrens' education is essential to the progress of any nation. ***b. Strong children's education is essential to the progress of any ...
March 4, 2016

English
Fix the sentence by following the apostrophe rule. The books story was pretty exciting, even though its cover was not. a. The books' story was pretty exciting, even though its cover was not. b. The book's story was pretty exciting, even though it's cover was not...
March 4, 2016

English
Thank you!
March 4, 2016

English
Correct the following paragraph so that it uses the right words and includes appropriate apostrophes. Tomorrow, its supposed to be hot outside, so your going to have to wear sunblock. Youre skin will be safer with brands of sunblock that offer several layers of protection. ...
March 4, 2016

English II
Roosevelt is arguing that journalists must only attack misconduct when they have valid proof. They must not dig just for the sake of digging; it is offensive to good Americans. Which statement most effectively argues against this claim? a. Even sensational journalism is ...
March 1, 2016

English II
In Bunyan's Pilgrim's Progress you may recall the description of the Man with the Muck-rake, the man who could look no way but downward, with the muck-rake in his hand; who was offered a celestial crown for his muck-rake, but who would neither look up nor regard the ...
March 1, 2016

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