Tuesday

February 28, 2017
Total # Posts: 1,015

**chemistry**

pKa+log10(10^2)= 2.35+2= 4.35

*May 31, 2013*

**Math**

If a pencil costs 300% more than an eraser and the eraser costs 25 cents, what is the cost of the pencil?

*May 24, 2013*

**math**

If I am 25% taller than you, then you must be 75% shorter than me 25% shorter than me 20% shorter than me 75% of my height

*May 9, 2013*

**math**

You want to explain to your friend that your bank’s interest rate has gone down from 1.2% to 0.3%. Which sentence below has the correct meaning? A)My interest rate has decreased 25%. B)My interest rate has decreased 0.9 percentage points. C)My interest rate is 0.9% of ...

*May 9, 2013*

**physics**

The distance between two planets is 1.6 x 10^6 m. How much time would the light signal take to go from one planet to the other?

*May 9, 2013*

**Calculus help please!**

Find the Antiderivative of 3/(3x+5) with steps

*May 3, 2013*

**Calculus**

Find the Antiderivative of 3/(3x+5) with steps

*May 2, 2013*

**poetry**

What sound devices are used in the poem "How I Learned English" I also need the examples of the sound devices used.

*April 17, 2013*

**university of phoenix**

bond that has a$1000 par value and a contract interest rate of 10.1%.The bonds have a current market value of $1,120and will mature in 10 years.The firms marginal tax rate is 34%

*April 16, 2013*

**Chemistry**

What are ways in which pka values for weak acids can be experimentally determined?

*March 30, 2013*

**Chemistry**

What are some equilibrium expressions that chemists use for weak acid equilibrium?

*March 30, 2013*

**Chemistry**

What are some equilibrium expressions that chemists use for weak acid equilibrium?

*March 30, 2013*

**Physics**

The load-bearing piston in a certain hydraulic system has an area 35 times as large as the input piston. If the larger piston supports a load of 9000 N, how large a force must be applied to the input piston?

*March 30, 2013*

**Math**

if 4/3 x 3/4 =5k whats k

*March 28, 2013*

**math**

8 c

*March 27, 2013*

**Math**

If you are riding a bike and your front sprocket (the one with the pedals) has 40 teeth and the rear sprocket (the one connected to your back tire) has 20 teeth, and you are pedaling at a rate of 50 rpm, how fast are you going if your bike has 27 inch diameter wheels?

*March 22, 2013*

**math**

If two rectangles have 16 inches what are two possible areas for each rectangle

*March 19, 2013*

**Chemistry - URGENT**

I had to type it in word and it formatted fine even when i emailed it to myself. So how do you calculate the rate constant?

*March 16, 2013*

**Chemistry - URGENT**

For 1 I got m is .282 and for 2 I got n is .53

*March 16, 2013*

**Chemistry - URGENT**

I figured out 1 and 2 but i don't understand how to do the rest

*March 16, 2013*

**Chemistry - URGENT**

So, I go to high school in Texas and we have this AP Chem lab due online tomorrow night by midnight and I need some serious help on these questions: Lab Temp 0.2°C Experiment Trial Time in seconds Trial 1 Trial 2 Average Time 1 1 2 ...

*March 16, 2013*

**Chemistry - reaction kinetics**

So, I go to high school in Texas and we have this AP Chem lab due online tomorrow night by midnight and I need some serious help on these questions: Lab Temp 0.2°C Experiment Trial Time in seconds Trial 1 Trial 2 Average Time 1 1 2 ...

*March 16, 2013*

**Chemistry**

So, I go to high school in Texas and we have this AP Chem lab due online tomorrow night by midnight and I need some serious help on these questions: Lab Temp 0.2°C Experiment Trial Time in seconds Trial 1 Trial 2 Average Time 1 1 2 256 275 268 ...

*March 16, 2013*

**Chemistry AP**

It was determined that a 0.10 M solution of an acid was only 2.5% ionkzed. Find the Ka and pKa for the acid.

*March 16, 2013*

**Chemistry**

2A(aq)-> B(aq) +C(aq) Initial concentration of A and B is 1.00 M, with no C. Kc = 0.200 find equilibrium concentrations

*March 15, 2013*

**physics**

wonder waves in shallow yellow dA.isc are 6.0 cm long. at one point, the water oscillates up and down at a rate of 4.8 of oscillations per second. A. what is the speed of the water waves? B. what is the period Of water waves?

*March 12, 2013*

**physics**

wonder waves in shallow yellow disc are 6.0 cm long. at one point, the water oscillates up and down at a rate of 4.8 of oscillations per second

*March 12, 2013*

**algebra**

√5 ____ √45 How do you simplify this. Do you multiply the top and bottom by the square root of 45

*March 7, 2013*

**4th grade Algebra**

Evaluate each expression when n = 75 12n 36n is that multiplication?

*March 7, 2013*

**math( pre-algeba)**

3/10

*February 28, 2013*

**Statistics**

i don't know

*February 19, 2013*

**Business Math**

If Wilma borrows $5,000 from her brother (at 5% interest per year) and the loan matures in 10 years, how much will she have to pay annually to pay the loan off in 10 years? How much will she have to pay annually to pay the loan off in four years?

*February 17, 2013*

**Maths**

The ratio John's age to Ryan's age is 3:1 now . 25 years later , the ratio will become 4:3 .How old is John now ?

*February 15, 2013*

**Maths**

The ratio John's age to Ryan's age is 3:1 now . 25 years later , the ratio will become 4:3 .How old is John now ?

*February 15, 2013*

**Math**

A dining room floor has an area of 52 yards. Alice wants to cover 3/4 of the floor with carpet. How many 4 square yards of carpet does she need?

*February 13, 2013*

**Physics**

Suppose that the gravitational acceleration on a certain planet is only 3.1 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 25 m/s. (a) What is the velocity of the ball 4 seconds after it is thrown? m/s (b) How much time...

*February 13, 2013*

**ap chemistry**

5.4 atm

*February 9, 2013*

**MATH**

49.9

*February 2, 2013*

**Math I need help Please help me!!!!!!**

The answer is- D. About 349 feet per hour

*January 30, 2013*

**Information Literacy**

Which of the following sets of Library of Congress call numbers is in the correct order? A. E88 G2512 S57 1998, E88 G62 D225, E88 G62 L166 1995, E88 G62 L45 B. E88 G62 L166 1995, E88 G62 L45, E88 G62 D225, E88 G2512 S57 1998 C. E88 G2512 S57 1998, E88 G62 D225, E88 G62 L45, ...

*January 12, 2013*

**Chemistry**

b= 8.8279*10^-20 in joules

*January 12, 2013*

**Chemistry**

It still wrong answer.

*January 11, 2013*

**Anthropology**

The difference between a state and a cheifdom is?

*December 9, 2012*

**math**

you borrow $1200 from a bank that bank charges 9.5% simple annual interest. after 15 months you pay back the loan. how much interest do you pay on the loan? what is the total amount that you pay the bank.

*December 6, 2012*

**Physics**

A boy is standing on a skateboard holding two 5.0 kg bowling balls. Initially they are moving to the left at a speed of 3.0 m/s. At one point the boy throws one ball to the right at 4.0 m/s causing his speed to increase. Before he can slow down, he throws the second ball to ...

*November 29, 2012*

**AP Psychology**

Elevating Arousal and Mood

*November 1, 2012*

**Physics**

35 cm

*October 31, 2012*

**physics**

A long thin rod is cut into two pieces, one being as long as the other. To the midpoint of piece A, piece B is attached perpendicularly, in order to form the inverted "T" shown in the figure. The application of a net external torque causes this object to rotate about...

*October 27, 2012*

**math**

The answer is B.

*October 23, 2012*

**math**

name a number that can be evenly divided by 6 and 7

*October 22, 2012*

**math**

The LCM of these three numbers is 60. The GCF is 1. If you add the numbers, the sum is 15. Select the three numbers from the following options: 2, 6, 5, 8, 4 Show your work!

*October 17, 2012*

**Physics**

A pendulum 1.70m long is released (from rest) at an angle 30 degrees. 1. Determine the speed(m/s) of the 60.0g bob at Theta = 15. 2. Determine the tension in the cord at the lowest point Theta = 0. 3. Determine the tension in the cord at Theta = 15. A formula would be ...

*October 17, 2012*

**CHM**

Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations A) 0.377 M B) 0.107 M C) 4.16*10^-2 M Ka= 1.9*10^-5

*October 8, 2012*

**Calc**

Whats the derivative of 2x^2*tan(X)/sec(x) ?

*October 4, 2012*

**physics**

Suppose runner A starts at the 0 degree mark on a circular track (circumference = 400m). And let runner B start at the 180 degree mark. If runner A starts running counter clockwise with acceleration 2m/s^2, and runner B runs clockwise with constant speed of 7 m/s, at what ...

*October 2, 2012*

**math**

there are 5 people.Each person has 1 hat.How many are in all.4

*October 1, 2012*

**Algebra 1**

xWrite the equation so that y is a function of x. -9x + 3y =18

*September 30, 2012*

**Math**

The formula s = the square root of 18d can be used to fnd the speed s of a car in miles per hour when the car needs d feet to come to a complete stop after slamming on the brakes. If it took a car 12 feet to come to a complete stop after slamming on the brakes, estimate the ...

*September 27, 2012*

**CHEM HELP ASAP!**

As a solid, Ag adopts a face-centered cubic unit cell. How many unit cells are present per cubic centimeter of Ag?

*September 27, 2012*

**math**

My four factors add up to 48 and I am between the numbers 30 and 40

*September 24, 2012*

**chemistry**

50.0g*0.459= 22.95g Ag 50.0g*(1.00-0.450)= 27.05g I 50= (22.95)+(27.05) Silver= 22.95g

*September 18, 2012*

**5th grade math**

The moon is about 240.000 miles from Earth. What is this distance written as a whole number multiplied by the power of ten?

*September 13, 2012*

**5th grade math**

What missing number makes the number sentence, 28.02=20+8=?, true?

*September 11, 2012*

**language**

Circle the simple subject and underline the simple predicate. The smell of cooking is delicious to the hungry campers.

*September 11, 2012*

**CHEM HELP ASAP!!**

Two 20.0-g ice cubes at –10.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. heat capacity h2o (S)=37.7 j/mol*k heat capacity h2o (l...

*September 11, 2012*

**CHEM HELP ASAP!**

Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of fusion 2.29 kg/mol

*September 11, 2012*

**DrBobb222!! Help!!**

Please look at my Chemistry problems again, I reposted them with the constants and such. I am still confused!

*September 11, 2012*

**Chemistry**

DrBob222, HELP! Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of fusion 2.29 kg/mol

*September 11, 2012*

**Chemistry**

DrBob222,HELP! Two 20.0-g ice cubes at –10.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. heat capacity h2o (S)=37.7 j/mol*k heat ...

*September 11, 2012*

**Chemistry**

Two - 20.0 g ice cubes @ -20 degrees C are placedinto275 g of water @ 25 degrees C. Assuming no energy is transfered to or from the surroundings caculate the final temperature of the water after the ice melts.

*September 10, 2012*

**Chemistry**

Calculate the heat energy release when 29.7 g of liquid mercury @ 25.00 degrees C is converted to solid merury at its melting point.

*September 10, 2012*

**Math**

Find the unknown digit to make the sentence true 2.48>2.4__ 1>2.463 5.723<5.72__ <5.725 7.64<7.___ 5<7.68

*September 10, 2012*

**chemistry**

(M1)(V1)=(M2)(V2) convert all moles to grams and mL to L 25mL=0.025L 1.04M (0.025L)=M2 (0.500L) 0.026=M2 (0.5L) (0.026)/(.5L)=M2 M2=0.052M NaCO3

*September 6, 2012*

**chemistry**

What volume of 2.50 x 10-4 M CV+ solution should be diluted to 10.0 mL to prepare a 7.50 x 10-5 M CV+ solution

*September 3, 2012*

**Science**

a .5kg ball is dropped from a 30m high building is on the ground for 2ms then bounces up 20m. What avg force was exerted on the ball?

*August 23, 2012*

**Physics**

A .5kg ball is dropped from a 30m high building is on the ground for 2ms then bounces up 20m. What avg force was exerted on the ball?

*August 23, 2012*

**7th grade pre algerbra**

18 necklaces

*August 8, 2012*

**MAth!**

In the list of five measurements shown below, one is blurred. Supply a fifth value that would make the median 8. 8 5 10 3 #

*July 28, 2012*

**Math-one more**

The average length of time, per week, that students at a certain university spend on homework is normally distributed with a mean of 24.3 hours and a standard deviation of 1.4 hours. Jane tells her parents she spends more time studying than 75% of the students on campus. How ...

*July 28, 2012*

**Math**

In the list of five measurements shown below, one is blurred. What must this value be, if the mean of the five measurements is 7? 8 5 10 3 #

*July 28, 2012*

**English help**

1c 2? 3b 4c 5c 6d 21a 22c 23d 24b 25c

*July 25, 2012*

**English help**

Question 1 Marks: 1 Davey has decided to research the history of fire engines in America. To get started he's written a list of research questions. Which of the following questions is the best research question for him to ask? a. Who holds the patent for the fire engine? b...

*July 25, 2012*

**English help**

1 Which of the following is NOT part of the process of synthesizing? a. finding main ideas b. finding supporting details c. determining a purpose d. comparing and contrasting ideas is it c?

*July 25, 2012*

**English help**

11a 12c 13b 14a c d e 15a c g 16b c d 17d 18c 19e 20c 21d 22a 23b 24a 25b

*July 25, 2012*

**English help**

1a 2d 3a 4c 5d 6a how about now?

*July 25, 2012*

**English help**

Are these right? 1.c 2.b 3.d 4.a 5.c 6.c 7.a 8.b 9.d 10.c 11.a 12.d 13.b 14.d 15.a 16.c 17.b 18.a 19.d 20.a 21.c 22.d 23.a 24.b 25.c

*July 25, 2012*

**English help**

Question 1 Marks: 1 A common theme that runs through all the sections of Song of Myself is Whitman's own — Choose one answer. a. belief in his power as a poet b. love of solitude c. inability to trust people d. failure to change the world Question 2 Marks: 1 Free ...

*July 25, 2012*

**elem math core**

An unknown number of slips of paper, each with the letter C written on them, are added to the bag. After this, it is known that P(A)=¼ and P(B)= ¹/6. Find P(C).

*July 11, 2012*

**elem math core**

A bag contains one each of red, blue, green, yellow and white marbles. Give the sample space for the following experiments. A) one marble is drawn at random B) one marble is drawn, but not replaced,and then a second marble is drawn.

*July 11, 2012*

**Statistics and Probability**

I had a problem similar to this that we did in my math class. Our teacher said that you take the # of outcomes over the total amount to get the ratio so for the blue beads it would be 6/9 or in other words the ratio would be 6:9. For the gold it would be 3 :9 because there are...

*July 11, 2012*

**goverment**

Choices- -legislative branch -House of Representatives -Supreme Court -executive branch

*June 13, 2012*

**statistics**

Bob scores 610 on his SAT's. If the mean score is 580 and the standard deviation is 115, what percentile is Bob's SAT score?

*May 21, 2012*

**Chemistry**

how many grams of aluminum sulfate are produced if 23.33 g Al reacts with 74.44 G CuSO4

*May 21, 2012*

**geometry**

Two triangles each have adjacent sides of length 120 feet and 180 feet. The first triangle has an angle between the two sides of 40 degrees, while the second triangle has an angle between the two sides of 60 degrees. What is the approximate difference between the areas of the ...

*May 2, 2012*

**economics**

4. Engineers for the Off Road Skateboard Company have determined that a 10% increase in all inputs will cause output to increase by 5%. Assuming that input prices remain constant, you correctly deduce that such a change will cause ________ as output increases. A) total cost to...

*May 1, 2012*

**Physics**

A copper pipe with an outer radius of 0.011 m runs from an outdoor wall faucet into the interior of a house. The temperature of the faucet is 4.4° C and the temperature of the pipe, at 3.1 m from the faucet, is 24° C. In fourteen minutes, the pipe conducts a total of ...

*April 26, 2012*

**Math**

6 3/5+1 3/5=8 1/5 +

*April 23, 2012*