Wednesday

June 1, 2016
Total # Posts: 1,033

**CHEMISTRY**

a) Write the formula for each component in a buffer solution of acetic acid and its’ salt. b) The Ka, for hypochlorous acid, HClO, is 7.2 x l0^–4 at 25°C. What is pKa? Write the equation for the reaction to which Ka applies.
*October 26, 2015*

**CHEMISTRY!!**

1) How would you prepare 20 mL of a solution having pH = 2.00 by dilution of 0.10 M HCl? 2) The Ka, for hypochlorous acid, HClO, is 7.2 x l0^–4 at 25°C. What is pKa? Write the equation for the reaction to which Ka applies.
*October 25, 2015*

**Physics**

A rocket blasts off from rest and attains a speed of 42.3 m/s in 13.8 s. An astronaut has a mass of 70.2 kg. What is the astronaut's apparent weight during takeoff?
*October 24, 2015*

**Math(ANSWERCHECK)!!**

percent error formula= |experimental value -accepted value| / |accepted value| * 100% % error = |0.846 g/mL - 0.78948 g/mL| / |0.78948 g/mL| *100% = 7.31 % Is 7.31% correct or was there a calculation mistake?
*September 28, 2015*

**MathHELP!**

How do I show my work as to identify the vertex, axis of symmetry, and x intercepts? g(x)= x^2 +2x +1
*September 28, 2015*

**Chemistry**

Calculate the amount of hydrochloric acid in 25cm3 of 0.100M HCl
*September 14, 2015*

**physics**

Vector Upper A Overscript right-arrow EndScripts has a magnitude of 75 units and points due west, while vector Upper B Overscript right-arrow EndScripts has the same magnitude and points due south. Find the magnitude and direction of (a) Upper A Overscript right-arrow ...
*September 13, 2015*

**physics**

One afternoon, a couple walks three-fourths of the way around a circular lake, the radius of which is 2.12 km. They start at the west side of the lake and head due south to begin with. (a) What is the distance they travel? (b) What is the magnitude of the couple’s ...
*September 13, 2015*

**physics**

The data in the following table describe the initial and final positions of a moving car. The elapsed time for each of the three pairs of positions listed in the table is 0.52 s. Review the concept of average velocity in Section 2.2 and then determine the average velocity (...
*September 13, 2015*

**college physics**

You step onto a hot beach with your bare feet. A nerve impulse, generated in your foot, travels through your nervous system at an average speed of 124 m/s. How much time does it take for the impulse, which travels a distance of 1.60 m, to reach your brain?
*September 13, 2015*

**Math**

Thank you, Reiny!!
*July 29, 2015*

**Math**

Oops, I left the equal sign out! The problem would actually be: ((1/x)-(1/y))/(y^2-x^2)= ____
*July 29, 2015*

**Math**

How would you simplify this equation?? ((1/x)-(1/y))/(y^2-x^2)
*July 29, 2015*

**english**

Thank you.
*June 22, 2015*

**english **

Asepsis, 766-793 Medical, 766-781 Cleaning in, 767 Client education in, 780 Control of infection transmission and, 768-769 Disinfection and sterilization in, 767-768 Hand hygiene in, 769-770 Isolation precautions and, 774-776 Personal protective equipment and, 779-780 ...
*June 22, 2015*

**math **

How can we measure a dollar bill? Is it in Inches, centimetres, and any measurements??
*June 22, 2015*

**bio**

what happens when the alveoli are destroyed? It is decrease in oxygen?
*June 22, 2015*

**Math**

Between 4am and 5am, the water rises from 1.4m to 1.9m. Therefore, it rises 50 centimetres in 60 minutes. This means that the water rises approximately 0.83 centimetres every minute (50 ÷ 60 = 0.83cm). The water will have to increase 0.31m – or 31cm – from 1....
*June 15, 2015*

**Science**

1. Two 20.-newton forces act concurrently on an object. What angle between these forces will produce a resultant force with the greatest magnitude? (1) 0° (2) 45° (3) 90.° (4) 180.° 2. A rock is thrown straight up into the air. At the highest point of the rock...
*June 12, 2015*

**Alg 2 HELP!**

I also wasn't sure how to put the equation together.. perform the indicated operation... g(f(x)); f(x)=x^2+3x; g(x)=2x+1
*June 12, 2015*

**Alg 2 HELP!**

Also my other question asked to perform the indicated operation AND STATE THE DOMAIN. (5x+7)*(x-9) = 5x^2 -38x-63 < ANSWER How would I write my Domain?
*June 12, 2015*

**Alg 2 HELP!**

Identify the x-intercepts, local maximum, and local minimum of the graph of f(x)=x^3+2x^2-13x+10 I am confused on where to begin.
*June 12, 2015*

**alg 2**

So I tried -4 and it worked. So that is so far my zero of f. so is this the right way to write the equation in order to find those zeros. f(x)=(x+4)(x^2+0+9) ?? cuz if you do synthetic division, you would subtract 4 from 4 to get zero which is the middle term. or should it not...
*June 12, 2015*

**alg 2**

list all the possible rational zeros of f using the rational zero theorem. Then find all hte zeros of the function. f(x)=x^3+4x^2+9x+36
*June 12, 2015*

**Alg**

Help please
*June 12, 2015*

**Alg**

Sorry about that. So the function is : y=x^4-2x^2-x-1
*June 12, 2015*

**Alg**

describe the end behavior of the graph of the polynomial function. Then evaluate the fucntion for x=-4, -3, -2, -1, 0, 1, 2, 3, 4. I'm confused on this. Help.
*June 12, 2015*

**Alg 2**

so is the answer I put correct in standard form??
*June 12, 2015*

**Alg 2**

If I were to graph it, the vertex would be (3,-7) so what would my other point be? Write this equation : y =4(x-3)^2 -7 in standard form . answer: y=4x^2 -24x +29 idk if this is right?
*June 12, 2015*

**pre calc**

The variables x and y vary directly. When x=12, y=9. Write an equation that relates the variables.
*June 8, 2015*

**Physics**

A plane is flying horizontally with speed 215 m/s at a height 2770 m above the ground, when a package is dropped from the plane. The acceleration of gravity is 9.8 m/s^2. Neglecting air resistance, when the package hits the ground, the plane will be _________. Can anyone ...
*June 1, 2015*

**general chemistry**

Explain the following quote with your understanding of the concept of gas mixtures (Ch. 10 concepts) and the composition of “common air” (i.e. the air in the atmosphere). Inflammable air is hydrogen. “By the experiments... it appeared that when inflammable air ...
*May 29, 2015*

**Anne Frank**

i agree with ms.sue on this one
*May 19, 2015*

**Math**

i agree with reiny
*May 12, 2015*

**Math**

the answers are 1.B 2.C 3.B 4.D
*May 8, 2015*

**math functions**

ya nice username bro
*May 4, 2015*

**math help me**

1.C 2.B 3.D 4.B 5.D 6.B 7.B 8.B 9.C 10.A here found the answers
*April 30, 2015*

**math help me**

i think
*April 30, 2015*

**math help me**

all i know on those answers are 1.C 2.C 3.D and that's all i know
*April 30, 2015*

**Math**

hey thats not cool man and she right number 7 and number 8 r wrong mystery girl and amy r right just amy got 7 and 8 wrong
*April 24, 2015*

**chem 2**

For 520.0mL of a buffer solution that is 0.140M in HC2H3O2 and 0.125M in NaC2H3O2, calculate the initial pH and the final pH after adding 0.020mol of HCl
*April 23, 2015*

**english**

WHAT ARE FEATURES OF A SHAKESPEARIAN COMEDY? ANSWER QUICKY PLEASE I NEED IT IN THE NEXT 10 MINUITES PLEASE.
*March 25, 2015*

**Physics**

We want to find how much charge is on the electrons in a nickel coin. Follow this method. A nickel coin has a mass of about 5.7 g. a. Find the number of atoms in a nickel coin. Each mole (6.02 × 10^23 atoms) has a mass of about 57.9 g. Answer in units of atoms. b. Find ...
*March 10, 2015*

**Physics**

b. Find the force on q1. Answer in units of N c. If an object contains the same number of electrons as protons, it is said to be 1. negatively charged. 2. neutral. 3. positively charged. 4. energized.
*March 10, 2015*

**Physics**

A charge q1 = 5 µC is at the origin, and a charge q2 = 4 µC is on the x axis at x = 6 m. Find the force on charge q2 . The Colulomb constant is 8.98755 × 10^9 N·m^2/C^2. Answer in units of N.
*March 10, 2015*

**Physics**

A strong lightning bolt transfers about 21.45 C to Earth. How many electrons are transferred? The elemental charge is 1.602 × 10^−19 C.
*March 10, 2015*

**LA**

What part of speech is idle in this sentence? "The kids are left idle with nothing to do."
*February 27, 2015*

**physics 100**

An aluminum wing on a passenger jet is 30 m long when its temperature is 20°C. At what temperature would the wing be 5 cm (0.05 m) shorter?
*February 26, 2015*

**statistics**

In a course there is a midterm exam, worth 40% of the course grade, and a final exam worth 60%. On the midterm the mean grade was 80 with a standard deviation of 10, and on the final the mean was 75 with a standard deviation of 15. The correlation between the two exams is 0.6...
*February 25, 2015*

**Chemistry**

A piece of iron (Cp = 0.450 J/(gi°C)) that has a mass of 21.5 g and an initial temperature of 100.0°C is submerged in X g of water (Cp = 4.184 J/(gi°C)) at 20.0°C. The temperature of the system (iron and water) changes to 21.4°C. What is the value of X?
*February 22, 2015*

**Physics**

A car and driver weighing 7740 N passes a sign stating “Bridge Out 27.7 m Ahead.” She slams on the brakes, and the car decelerates at a constant rate of 12.3 m/s^2. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the work done stopping the car if ...
*February 14, 2015*

**Geometry**

Quadrilateral GHIJ is a scale drawing of quadrilateral ABCD with a scale factor r. Describe the following statements as always true, sometimes true, or never true, and justify your answer. a. AB/GH = BC/HI b. perimeter (GHIJ) = r * perimeter (ABCD) c. Area (GHIJ) = r * area (...
*February 13, 2015*

**Physics**

A 65.0 kg ice skater moving to the right with a velocity of 2.5 m/s throws a 0.15 kg snowball to the right with the velocity of 32.0 m/s relative to the ground. a. What is the velocity of the ice skater after throwing the snowball? disregard the friction between the skates and...
*February 10, 2015*

**Chemistry**

If 3.0 liters of oxygen gas react with excess carbon monoxide at STP, how many liters of carbon dioxide can be produced under the same conditions? 2 CO (g) + O2 (g) ---> 2 CO2 (g)
*February 4, 2015*

**statistics**

The following contingency of frequencies is based on a 5-year study of fire fatalities in Maryland. For purposes of clarity, columns and rows are identified by the letters A-C and D-G, respectively. Blood Alcohol Level of Victim A B C Age 0.00% 0.01-0.09% ¡Ý0.10% ...
*January 31, 2015*

**linear equation**

john invested $4000 into stocks(s) and bonds(b). The stocks earned 7% interest. the bonds earned 9% interest. if the investment earned $300, how much money did john have in stocks and bonds. my question- how do I write this formula so I can find the answer
*January 22, 2015*

**history**

I think the answer is C
*January 19, 2015*

**history**

15. The Articles of Confederation called for which of the following? A. The right of the legislature to assess taxes B. The Northwest Ordinance C. A single legislative body D. A chief executive
*January 19, 2015*

**Geometry**

Write a proof. 1. Prove: If the diagonals of a parallelogram are perpendicular, then the parallelogram is a rhombus. 2. Prove: If the diagonals of a parallelogram are congruent, then parallelogram is a rectangle.
*January 16, 2015*

**bookkeeping**

the amounts that increase the cash account are entered in what column?
*December 8, 2014*

**chem**

A weak acid, HA, has an ionization constant of 9.29 x 10-6. If we prepare a solution that is 0.727 M in HA what percent of the acid will be ionized?
*November 30, 2014*

**chem**

The Ka of an acid is 6.3 x 10-8. To the nearest one hundredth, what is its pKa
*November 30, 2014*

**Chemistry **

1. Write a balanced molecular equation for the reaction of solid AgNO3 with aqueous NaCl. Be sure to include the correct number of coefficients and the state of the species (aq, s, l or g). 2. Write the total ionic equation for this reaction, including all physical states. 3. ...
*November 26, 2014*

**Chemistry**

1. A combination reaction may also be a displacement reaction. True or False 2. The combustion of an element is always a combination reaction. True or False For number 1, I first thought true, but then again, nothing is being displaced in a combination reaction, right? You are...
*November 19, 2014*

**Physics**

Mass 1 with a unknown mass starts at rest at the top of a frictionless from a height of 13 meters. It then slides down the incline and moves over a horizontal frictionless surface and collides inelastically (head on) with mass 2 which is 25.4 kg and initially at rest. After ...
*November 11, 2014*

**Chemistry**

Sorry for the double post. Just saw that my original question actually posted though I was told it had not.
*November 1, 2014*

**Chemistry**

A 0.2800 g sample of an unknown acid requires 28.22 mL of 0.1199 M NaOH for neutralization to a phenolphthalein point. a.) How many moles of OH- are used? b.) How many moles of H+ are found in the acid? c.) What is the calculated equivalent molar mass of the unknown acid? If I...
*November 1, 2014*

**Chemistry**

A 0.2800 g sample of an unknown acid requires 28.22 ml of 0.1199 M NaOH for neutralization to a phenolphthalein end point. a.) How many moles of OH- are used? b.) How many moles of H+ are found in the acid? c.) What is the calculated equivalent molar mass of the unknown acid? ...
*October 31, 2014*

**Math**

In three successive years the price of the common shares of Bedrock Resources Ltd. fell 40%, 60%, and 70% ending the third year at 50 cents. a. What was the share price at the beginning of the three-year skid? b. How much (in dollars and cents) did the share price drop in the ...
*October 27, 2014*

**STATISTICS HELP!!!!!**

That's what I got is it correct?
*October 24, 2014*

**STATISTICS HELP!!!!!**

a. 0.214 b. 0.787
*October 24, 2014*

**STATISTICS HELP!!!!!**

Bender Electronics buys keyboards for its computers from another company. The keyboards are received in shipments of 175 boxes, each box containing 30 keyboards. The quality control department at Bender Electronics first randomly selects one box from each shipment and then ...
*October 24, 2014*

**Science Density**

Water has a density of 1.0g/cm3. Aperson sits in a bath 150cm in length and 90 cm width. Thw water had a depth of 60cm befor the person sat in the bath. after sitting in the bath the water level rose to 68cm. Calculate the mass of the person, giving your answer in kg.
*October 22, 2014*

**Science -Density**

gold has a density of 19.30 g/cm3 . What si the mass of a bar of gold 15 cm x5 cm x 8 cm
*October 22, 2014*

**Chemistry**

Use standard enthalpies of formation to determine ΔHorxn for: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l) Enter in kJ.
*October 21, 2014*

**S.S.**

The answer to 12 is Alexander Hamilton
*October 18, 2014*

**College question**

Thanks!
*October 9, 2014*

**College question**

I did my personal essay but I'm not sure if that's the one I'll be submitting. I might rewrite it. I'm applying to city college, hunter, university at buffalo, pace university, binghamton university, le moyne college, st.john's university, and hofstra ...
*October 9, 2014*

**College question**

I checked and it said they accept scores between 1660 and 1980, so I don't think they really look at writing. And for the transfer students they don't look at sat or act scores
*October 9, 2014*

**College question**

My math score was 570 Writing 570 Reading 550
*October 9, 2014*

**College question**

Thank you!
*October 9, 2014*

**College question**

Sorry, Stony Brook University
*October 9, 2014*

**College question**

I'm a high school senior and I'm planning on applying to SBU. I have a 4.0 gpa, a 1690 on the SAT(am going to retake), a 24 on the ACT, took 3 AP classes and am currently taking 2 more, part of National Honor Society, in the top 5% of my school, have an advanced ...
*October 9, 2014*

**Algebra 1**

I have been trying to figure out how to solve multi-step equations. Such as 1/2x+1/4x=16. How do you solve these? I can't seem to figure it out.
*September 29, 2014*

**English**

16. If an adverb modifies a verb, where should you generally place it in a sentence? A. At the end of the sentence B. Near the verb. C. Before the verb D. Anywhere in the sentence
*September 26, 2014*

**Finite**

A box contains 8 blue balls, 3 white balls, and 5 red balls, and that we choose two balls at random from the box. What is the probability of neither being blue given that neither is white?
*September 25, 2014*

**CHEMISTRY**

How to determine direction of polarity? For instance im studying from a practice quiz, an it says that in CH3OH the oxygen is slightly negative, which is understandable as its next to F. but then it says the H is slightly positive. why the H and not the carbon which is two ...
*September 24, 2014*

**Organic Chemistry**

Label each reactant according to it role or roles in the chemical reaction? Two different (OH-) + (HBr) ----> (HOH) + (Br-) (OH-) + (H3CBr) ----> (H3COH) +(Br-) Lewis base, bronsted base, nucleophile, lewis acid, bronsted acid, nucleophile
*September 15, 2014*

**Organic Chemistry**

Consider the resonance structures for the carbonate ion. O--C-O(-) l O(-) (-)O-C--O l O(-) (-)O-C-O(-) l l O How much negative charge is on each oxygen of the carbonate ion? A)0, B) -.33, C)-.50, D) -.67, E)-1.00, F)-1.33, G)-1.50, H)-1.67, I)-2.00 What is the bond order of ...
*September 15, 2014*

**CHEMISTRY**

if you copy the link from beginning to end itll paste easily into a search bar.
*September 7, 2014*

**CHEMISTRY**

Ch3CN(CH3)C2H5 is my kekule drawing ok? I drew it and uploaded a picture. oi61. tinypic . com/2vmztir.jpg
*September 7, 2014*

**calc**

Two paths represented by [x, z] = [-82.2, 43] +s [0.2, 1.7] and [x, y] =[-84.4, 45.5] +t [2.4 -0.9]. Determine the intersection of the two paths.
*July 6, 2014*

**Chem URGENT**

How much energy (in kilojoules) is released when 13.3g of steam at 114.5∘C is condensed to give liquid water at 67.0∘C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6 J/(K⋅...
*June 17, 2014*

**Pre-Algebra**

How would I also solve the following? f(x)=x^2-4+3 what is the output of f(-3)?
*June 3, 2014*

**Pre-Algebra**

n(n-1)-4 How do I solve stuff like this?
*June 3, 2014*

**English**

This piece focuses on the increase use of smartphones of youths in South Korea. Should I reword that phrase?
*May 14, 2014*

**math**

A Jewlery box has length of 3 and a half, a width if 1 and a half, and a height of 2 units. What is the volume if the box I cubic units? Each of the cubes in this activity has a side length of 1/2. How many cubes with side length 1/2 does it take to form a unit cube? How many ...
*May 6, 2014*

**us history**

can you check my answers please? The “silent majority” referred to A. conservative working- and middle-class citizens B. women C. a liberal coalition of ethnic minorities, women, the aged, and the poor D. the nation’s youth E. deaf-mutes in government programs I...
*April 28, 2014*

**Class Board**

Characteristics and talents that will make me a great leader and member of Class Board is that I am helpful. Helping with homework, simple tasks, struggles that one faces, or providing ideas is a way of how I exemplify this characteristic. I also enjoy doing volunteer work. ...
*April 24, 2014*

**Class Board**

Would volunteering be considered as a talent/characteristic?
*April 24, 2014*