Friday

September 19, 2014

September 19, 2014

Total # Posts: 560

**CHEM**

Why is CH 4 nonpolar whereas CH 3 Cl is polar?
*September 14, 2014*

**Physics**

A projectile is launched from the earth’s surface at initial speed v0 at angle θ0 with the horizontal. When the projectile is at its maximum height h, it has half the speed it had when it was at half its maximum height (h/2). At what angle was the projectile launched?
*September 13, 2014*

**Goverment**

That's how the question was asked.
*September 12, 2014*

**Goverment**

Since the founding of the nation, there have been countless debates regarding how much power and autonomy should be afforded to the states in relation to the federal government. How much power and autonomy should Texas have in relation to the federal government? Why?
*September 12, 2014*

**chemistry :)**

Write the formula for the polyatomic ion in NaNO 3. Write the formula for the polyatomic ion in Ag2CO3. Write the formula for the polyatomic ion in NaHCO3. Write the formula for the polyatomic ion in BaSO4
*September 11, 2014*

**Math**

I just wanted to double check that I am correct. Answer is in Interval Notation. 1. Solve: |x|<7 Work: -7>x<7 Answer: (-7,7) 2. Solve: |x|>_ 7 Work: -7<_ x >_ 7 Answer: ( - infinity sign, -7] U [7, infinity sign)
*September 9, 2014*

**math 12**

Oh I get it now! Thanks
*September 7, 2014*

**math 12**

Here is question on an math assignment I was given, I have no clue what it is even asking. It's a Challenge Yourself question, I've typed it exactly how it is on my paper: A student is having difficult figuring out what is wrong with his proof: Let C=D C^2=CD C^2 - D^2...
*September 7, 2014*

**CHEM**

Arrange the elements in decreasing order of the number of valence electrons Br,S,Sb,Sr,F,Mg,I,Ca,Na,Kr,Xe,Bi,Ge,Ga,K
*September 5, 2014*

**Math**

Which of these equations would not be in quadratic form? A.X^4-13X^2+36=0 B.2X^(2/5)+X^(1/5)-6=0 C.6x^3+2x^2-8X=0 D.3(2/x-4)^2+5(2/x-4)-2=0 I think its between C or D. C because the exponents are different not doubled and D because its set up is completely the opposite from ...
*September 3, 2014*

**Math**

is the least common multiple of any number n and 1 is n?
*September 3, 2014*

**Math**

Is the GCF factor of any number n and 1 is n?
*September 3, 2014*

**Math**

FACTOR 6x^3+2x^2-8x =0 I know the GCF is 2x thus leaving: 2x(3X^2+X-4X)=0 *Stuck after this part*
*September 3, 2014*

**Math**

Find two pairs of numbers with 10 as their least common multiple
*August 26, 2014*

**science**

Suppose you were balancing a chemical equation that contained the substance sodium nitrate, NaNO3, composed of a sodium ion, Na+1, and a nitrate ion, (NO3)-1. Could you change any of these numbers in order to balance the equation?
*August 25, 2014*

**math**

1.Can a small child play with a fat child onthe see-saw?
*August 8, 2014*

**E**

what is the angle of rotation about D when the measure of the acute angle between lines m and n is 36 degrees
*June 30, 2014*

**Math**

dasdsdjk
*June 24, 2014*

**Physics**

An electric lawn mower has a resistance of 160 ohms and draws 15A. What is the cost of operating the lawn mower for 30 minutes if electrical energy costs $0.12/kWh?
*June 16, 2014*

**Physics**

A 66.2 kg person sits on the 5.3 kg sled (slope is on an angle, angle not given). It is to be pulled across the snow with a coefficient of friction equal to 0.12. What horizontal force is required to pill the sled at a constant speed?
*June 16, 2014*

**physics**

1.2273 m
*May 12, 2014*

**Algebra**

The length of Joe's rectangular garden is 1 meter less than its width and its area is 120m^2. Find the dimensions of the garden. Setup a quadratic equation to find the dimensions of the garden.
*May 12, 2014*

**physics**

Which of the following statements is not true about resonance? Answer It is easy to get an object to vibrate at its resonant frequencies but difficult to get it vibrate at other frequencies. A simple pendulum has many resonant frequencies called harmonics. A spring-mass system...
*May 5, 2014*

**Chemistry**

What volume of each solution contains 0.220mol of NaI? a.) 0.142M NaI b.) 0.902M NaI c.) 1.61M NaI
*May 1, 2014*

**physics**

Three resistors, each of resistance 6 Ω, are connected in such a way that that they form the three sides of a triangle. What is the equivalent resistance between any two vertices of the triangle?
*April 23, 2014*

**Math**

Richard Simons is selling his house. He has a choice of taking $125,000 today or $135,000 in 6 months. If he takes the money today, he can invest it at Valley Bank at 5% interest compounded monthly. a) How much would be in the account after six month if he took the $125,000. b...
*April 13, 2014*

**math**

A man has 21 coins in his pocket, all of which are dimes and quarters. If the total value of his change is 405 cents, how many dimes and how many quarters does he hav
*April 9, 2014*

**physics**

How many excess electrons are there in a typical lightning bolt that has about 16 C of charge? Answer 1 x 1020 1 x 1019 10 1 x 1016
*April 7, 2014*

**statistics**

A multiple choice exam has 20 questions; there are four choices for each question. A student guesses the answer to every question. Find the chance that he guesses correctly between four and seven times. Find the minimum score the instructor can set so that the probability that...
*February 10, 2014*

**social**

Season 3 episode 6 apparently, at least one of the early episodes in season 3
*January 27, 2014*

**Chemistry**

Consider 51.5 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.210. What volume of water must be added to make the pH = 5.000 I've tried everything but I am not getting the right answer!
*January 26, 2014*

**strayer**

In a survey of a TriDelt chapter with 50 members, 21 were taking mathematics, 32 were taking English, and 6 were taking both. How many were not taking either of these subjects?
*January 22, 2014*

**health**

A. Digestion, movement, absorption B. Digestion, elimination, restoration C. Digestion, absorption, elimination D. Digestion, absorption, restoration
*January 10, 2014*

**health**

What three processes does food undergo in the digestive system?
*January 10, 2014*

**World Geography**

Central America & Carribean
*December 12, 2013*

**World Geography**

a What are the major groups that blended to form the culture of this region? b What are some major sources of income in the economies of Central America and the Caribbean? c What forms of music have evolved in the region?
*December 12, 2013*

**8th grade Science**

Please help I'm not very sure about my answer
*September 29, 2013*

**8th grade Science**

In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock formations. From this ...
*September 29, 2013*

**math**

2. Assume you working on the house pictured below. The length of the house is 50 feet, the width is 30 feet, and from the ground to the gable (the height of the rectangle) is 10 feet. The height of the triangular prism on top is 6.5 feet.
*September 20, 2013*

**physics**

A commuter backs her car out of her garage with an acceleration of 1.6 m/s2. How long does it take her to reach a speed of 2.3 m/s in seconds
*August 29, 2013*

**math**

Michelle buys 18 oz ofa certain cereal for $1.14. What was the price per pound of the cereal to the nearest cent?
*July 28, 2013*

**MITx: 2.01x**

are you shure i put this Q2_1_1 TXC=-t_0*L and its wrong and this one c) x=2*L too
*July 26, 2013*

**Math/Algebra**

Find the standard equation of an ellipse with the given characteristics and sketch the graph. Vertices at (0,-5), and (0,5); Foci at (0,-4)and (0,4).
*May 26, 2013*

**Math/ Algebra**

Find the slope-intercept equation of the line that satisfies the given conditions. Then graph the line. Contains points P=( -1,4);parallel to the line with equation 3x+y =5
*May 26, 2013*

**Math/ Algebra**

Graph each liner equation and locate the x and y intercepts y/2-3x/5=1
*May 24, 2013*

**Math/ Algebra**

Graph each liner equation and locate the x and y intercepts y/2-3x/5=1
*May 24, 2013*

**physics**

An automobile and train move together along parallel paths at 28.8 m/s. The automobile then undergoes a uniform acceleration of −4 m/s 2 because of a red light and comes to rest. It remains at rest for 63.8 s, then accelerates back to a speed of 28.8 m/s at a rate of 1....
*May 21, 2013*

**Writing skills 1**

1. Which of the following is correct in regard to the use of formal English? A. Formal English is used more frequently in speaking than in writing. B. In formal business correspondence, it's best keep the language impersonal. C. Contractions are considered acceptable in ...
*May 9, 2013*

**Chemistry**

I just to know how to identify the substance that is reduced, the substance that is oxidized, the oxidizing agent and the reducing agent in each reaction. As (s) + ClO3-(aq) → H3AsO3 (aq) + HClO(aq) CN-(aq) + MnO4-(aq) → CNO-(aq) + MnO2(s) C2H5OH + MnO4- → ...
*April 30, 2013*

**chemistry**

9.88*10^-6 m
*April 26, 2013*

**wesley**

there will be a coin toss to determine the winner of the $5 million prize. You are offered $100,000 for your ticket right now. What would you do?
*April 21, 2013*

**Chemistry**

Calculate the pH of a 50.0 mL solution 0.0120 M ethylaminium chloride (C2H5NH3Cl ) and 0.0360 M ethylamine C2H5NH2. Kb = 4.3 x 10-4 Calculate the pH when 5.0 mL of 0.1 M HI is added. Ignore any changes in the volume
*April 17, 2013*

**Chemistry**

Which is the strongest acid, CCl3COOH or CH2ClCOOH please explain WHY it is stronger.
*April 7, 2013*

**Chemistry**

i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 c. a 0.1 M solutions of a base ...
*April 7, 2013*

**Chemistry**

i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 c. a 0.1 M solutions of a base ...
*April 6, 2013*

**physics**

both a) and b) are 0.024
*April 6, 2013*

**Chemistry**

i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 c. a 0.1 M solutions of a base ...
*April 6, 2013*

**chemistry**

If your equation of the line for you SAM analysis is y=1x+0.3436, what is the concentration of MgO in W/w% in your unknown with a mass of 0.1018?
*April 5, 2013*

**chemistry**

If your equation of the line for you SAM analysis is y=1x+0.3980, what is the concentration of Mg in ppm in your unknown solution?
*April 5, 2013*

**Life orientation**

Global warming,air pollution and water pollution
*March 26, 2013*

**PreAlgebra**

Math estimate quotient 6 1/3 divided by 3 1/7
*March 20, 2013*

**chemistry**

If 24.0 L of O2 burns completely a sample of carbon disulfide, how many moles of sulfur dioxide (SO2) will be produced at 15 degrees Celsius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2SO2
*March 17, 2013*

**chemistry**

If 24.0 L of O2 burns completely a sample of carbon disulfide, how many moles of sulfur dioxide (SO2) will be produced at 15 degrees Celsius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2SO2
*March 17, 2013*

**chemistry**

If 24.0 L of O2 burns completely a sample of carbon disulfide, how many moles of sulfur dioxide (SO2) will be produced at 15 degrees Celsius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2SO2
*March 17, 2013*

**Chemistry**

How do you solve this: if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? (the answer is 45.7 g). CS2 + 3O2 -> CO2 + 2SO2
*March 17, 2013*

**Chemisrty**

the equation is supposed to say: CS2 + 3O2 -> CO2 + 2SO2 * O2 not 3CO2
*March 17, 2013*

**Chemisrty**

How do you solve this: if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? (the answer is 45.7 g). CS2 + 3CO2 -> CO2 + 2SO2
*March 17, 2013*

**Chemistry**

if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2 SO2
*March 17, 2013*

**Chemistry**

if 24.0 L of O2 burns completely a sample of carbon disulfide, how many grams of sulfur dioxide will be produced at 15 degrees celcius at a pressure of 1.3 atm? CS2 + 3O2 -> CO2 + 2 SO2
*March 17, 2013*

**Calculus**

16/5=21
*March 15, 2013*

**accounting**

24000 pounds of product a can be sold for $8 per pound
*March 13, 2013*

**Algebra**

432.5
*March 12, 2013*

**Chemistry**

The decomposition of hydrogen peroxide is first order in H2O2: 2H2O2(aq) → 2H2O(l) + O2(g) Rate = k [H2O2] How long will it take for half of the H2O2 in a 10-gal sample to be consumed if the rate constant for this reaction is 5.6 x 10-2 s-1?
*March 5, 2013*

**Chemistry**

Never mind I figured it out Ln(At)=-(.152min-1)(120min)+ln(10) Ln(At)= -18.24+(2.30) Ln(At)=-15.9 e^At=e^-15.9 At= 1.19 x 10^-7 %=1.19 x 10^-7 x 100 =1.19 x 10^-5 % of the isotope
*March 5, 2013*

**Chemistry**

I've figured out most of it. I'm not sure how to find the percentage ofd the isotope. Define the half life. The half-life of a radioisotope is found to be 4.55 minutes. If the decay follows first order kinetics, what percentage of isotope will remain after 2.00 hours ...
*March 5, 2013*

**Chemistry**

I need to know the kcal/mol. How do I find the kcal/mol??
*March 5, 2013*

**Chemistry**

I've figured out the Ea but I'm not sure how to find the kcal/mol The gas reaction N2O5 → 2NO2 + 1/2O2 follows the Arrhenius equation k = Ae(-Ea/RT) where R = 8.314 J K-1 mol-1 and 1 calorie = 4.184J. At the temperature T=273K, k = 3.46 x 10-5 s-1, whereas at T...
*March 5, 2013*

**Chemistry**

. For the reaction 2H2(g) + 2NO(g) → N2(g) + 2H2O(g) The observed rate law is Rate =k[NO]2[H2] The mechanisms shown below have been proposed to explain the kinetics of the above reaction Which of the following are acceptable mechanisms? Explain you answer Mechanism I 2H2...
*March 5, 2013*

**Chemistry**

I've tried to answer some -The reaction mechanism for a reaction is as follows… Step 1 O3 (g) + NO2 (g)→ NO3 (g) + O2 (g) slow Step 2 NO3 (g) + NO2 (g) → N2O5 (g) fast a. Write the overall reaction equation. b. Identify the molecularity of each step. They ...
*March 5, 2013*

**Chemistry**

Given…Overall reaction: 2 NO2 (g) + F2 (g) → 2 NO2F (g) Rate = k[NO2][F2] a. Can this be a single step reaction? b. Postulate a mechanism using experimental data and chemical intuition come up with a mechanism that fits.
*March 5, 2013*

**7th Math**

What is the function rule for 2,30 4,15 6,10 10,6 12,5 15,4 30,2
*March 5, 2013*

**Chemistry**

First find the moles of HCl by dividing .15/36.45 and then once you find the moles divide that by the liters given which in this case is 8 and that will give you the molarity which you can plug into -log(H+) and that should give you 3.3 as the answer.
*March 1, 2013*

**trig**

If cot x = .78, what is tan x?
*February 21, 2013*

**physics**

A 0.145-kg baseball pitched horizontally at 27 m/s strikes a bat and is popped straight up to a height of 38 m. If the contact time between the bat and the ball is 2.35 ms, calculate the average force [exerted by the bat on the ball] during contact. [Let the positive axis lie ...
*February 19, 2013*

**chemistry**

How do I find mols?
*February 17, 2013*

**chemistry**

A solution contains 0.02755 g of a protein in 25.0 mL of solution. The osmotic pressure is 3.22 torr at 298 K. What is the molecular weight of the protein?
*February 17, 2013*

**Chemistry**

Lauryl alcohol is obtained from coconut oil and is used to make detergents. A solution of 5.00 g of lauryl alcohol in 100.0 g of benzene freezes at 4.2 oC. What is the approximate molar mass of lauryl alcohol. Refer to the text book for the boiling point of pure benzene. (80 C...
*February 17, 2013*

**Chemistry**

Arrange the following aqueous solutions in order of increasing boiling point, explain your answer: 0.120 m glucose (C6H12O6), 0.05 m LiBr, 0.05 m Zn(NO3)2. Using data the boiling point constants given in the test book, calculate the boiling points of each of the above aqueous ...
*February 15, 2013*

**Chemistry**

What is the % mass of 12 M hydrochloric acid. Density of 12 M hydrochloric acid solution is 1.18 g/mL and the density of water is 1.00 g/mL
*February 15, 2013*

**Chemistry**

How many grams of sulfuric acid is in 25.0 g of 8.00 % H2SO4 solution?
*February 15, 2013*

**Alagbra 2**

0.125
*February 15, 2013*

**Math**

Find the intergral of (1+x)/sqrt(3-x^2)
*February 13, 2013*

**Calculus**

Find the intergral of (1+x)/sqrt(3-x^2)
*February 13, 2013*

**chemistry**

anyone help me . .what volume of concentrated HCL solution whoch is 36% by mass and has a density of 1.179 g/ml , should be used to make 4.7 L of hcl solution with a pH of 1.8 ?
*February 13, 2013*

**Chemistry**

Why don't you tell me how you approached the problem and then I can see for myself. There's a general method of doing this so I figure you'd know and get some kind of answer. My question wasn't if you could check my work; my questions are clearly indicated with...
*February 10, 2013*

**Chemistry**

The first-order rate constant for the decomposition of N2O5, 2N2O5(g) --> 4NO2(g) + O2(g), at 70 degrees C is 6.82 x 10^-3 s^-1. Suppose we start with .0208 mol of N2O5(g) in a volume of 2.2 L. How many minutes will it take for the quantity of N2O5 to drop to .014 mol? I&#...
*February 10, 2013*

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