Wednesday
August 20, 2014

Posts by bri


Total # Posts: 196

NCCU
11. What mass of sodium benzoate should be added to 160.0mL of a 0.17M benzoic acid solution in order to obtain a buffer with a pH of 4.30?
June 21, 2014

algebra
A single card is drawn from a standard deck of cards. Find the probability if the given information is known about the chosen card. A face card is a jack, queen, or king.
May 26, 2014

Algebra 2
if an object is thrown vertically upward with an initial velocity of v from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s (where h and s are in ft t is in seconds and v is in ft/sec) If a rock is thrown upward from a height of 100ft, with an ...
April 23, 2014

Chem
THANKS. I figured it out.
March 12, 2014

Chem
how do i find the rate constant?
March 12, 2014

Chem
i got N=0.83 does the seem right?
March 12, 2014

Chem
suppose that you place exactly 100 bacteria into a flask containing nutrients for the bacteria and that you find the following data at 37 °C: t (min):0 15.0 30.0 45.0 60.0 Number of bacteria: 100 200 400 800 1600 What is the order of the rate of production of the bacteria...
March 12, 2014

chemistry
Hey Guys so I have this problem with ICE tables that is extremely confusing for me so I would love some help on it! At a Certain Temperature, the equilibrium constant for the reaction of NO with Cl2 is 6250. If the initial concentration of NOCl is 1.0M and that of NO 0.10M ...
March 7, 2014

Spanish 2
@SraJMcGin Was #2 correct also? Thanks! :)
March 6, 2014

Spanish 2
Fill in the blank with the correct imperfect form of the verb. Include accent marks when needed. 1.) Mis amigos______la playa. (ir) 2.) Mama______la casa. (limpiar) 3.) Mi hermano y yo____la leche.(beber) 4.) Yo_____la cena. (preparar) 5.) ¿Tú_____los libros? (...
March 6, 2014

spanish 2
Fill in the blank with the correct imperfect form of the verb. Include accent marks when needed. 1.) Mis amigos______la playa. (ir) 2.) Mama______la casa. (limpiar) 3.) Mi hermano y yo____la leche.(beber) 4.) Yo_____la cena. (preparar) 5.) ¿Tú_____los libros? (...
March 5, 2014

Chem 2
Thanks so so much! I was really confusing myself! The steps really helped!
February 21, 2014

Chem 2
Im sure i did this wrong but this is what i did deltaT=Kfm m=mols solute/ kg solvent 1.56g vitamin k/83.8g= 0.019 m=0.019/ 0.025 = 0.76
February 21, 2014

Chem 2
when Im getting my Kf do i change it from Celsius to Kelvin before i do my calculation?
February 21, 2014

Chem 2
Vitamin K is involved in normal blood clotting. When 1.56 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 5.23 °C. . Calculate the molar mass of vitamin K. I posted this yesterday but I got the wrong answer and could use ...
February 21, 2014

Chem 2
When i did the problem i got 0.76 but i think its wrong?
February 20, 2014

Chem 2
Vitamin K is involved in normal blood clotting. When 1.56 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 5.23 °C. . Calculate the molar mass of vitamin K.
February 20, 2014

Chem 2
When 3.89 g of a nonelectrolyte solute is dissolved in water to make 835 mL of solution at 26 °C, the solution exerts an osmotic pressure of 825 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the molar mass of ...
February 20, 2014

algebra
the larger of two numbers is 12 mo're than the smaller.Their sum 84. Find the numbers.
January 31, 2014

math
Pre-Cal between 0 degree C and 30 degree C the volume V (in cubic centimeters) of 1kg of water at a temperature T is given by the formula. V=999.87-0.06426T+0.0085043T^2-0.0000679T^3 Find the temperature at which the volume of 1 kg of water is a minimum.
January 28, 2014

Science-bobpursley/Ms.Sue
Don't break the honor code but i can help explain a little try looking up to see if the fossils under the trilobite is older than you will know
December 12, 2013

Science-Ms.Sue
what about number 4 is tat also d i am trying to understand evolution much better.
November 24, 2013

algebra
what is negative one sixth times two and three fourths
June 30, 2013

Math
write an expression equivalent to -1/4(8y-10)
June 1, 2013

Algebra
Hi, can I have some help with my permutation/combination homework? "Find the number of 5-card hands that contain the cards specified." 1. five red cards 2. five cards, none are number cards 3. five cards of the same suit
May 29, 2013

us history
Why did Johnson request the Tonkin Gulf Resolution
April 15, 2013

College Statistics
yes
March 30, 2013

Math- PLEASE HELP
Ok I corrected my mistake and got that it would cost $51.48, because it was 15 gallons she needed to get. Is this correct now? Thank you
March 17, 2013

Math- PLEASE HELP
MS Wilkens went to the gas station to fill her car. Her gas tank is 20% full. The cost of gas is $4.29 per gallon. How much will itcost to fill the tank? Use the conversion 1 gallon=231 in cubed. They showed a pic. of a tank with length=1.75ft width=1.25 ft height=11 in I did ...
March 17, 2013

pre cal
If (a, b) is a point on the unit circle that corresponds to the angle t, then tan(t) equals:
February 17, 2013

Expand binomial Pascal's triangle
(p+q)^9
January 17, 2013

statistics
your teacher has invented a fair dice game to play. your teacher will roll one fair eight sided die and you will roll a fair six sided die. each player rolls once and the winner is the person with the higher number. in case of a tie neither player wins. a. let A be the event &...
January 6, 2013

chemistry
In the following reaction, how many grams of ferrous sulfide (FeS) will produce 0.56 grams of iron (III) oxide (Fe2O3)? 4FeS + 7O2 d 2Fe2O3 + 4SO2
December 6, 2012

physics
A small child has a wagon with a mass f 10 kilograms (KG). The child pulls on the wagon with a force of 2 newtons (N). What is the acceleration of the wagon?
December 4, 2012

Chemistry
Balance the following equations: A. N2O>N2+O2 B. HBr>H2+Br2 C. CH4+O2>CO2+H2O
November 28, 2012

Chemistry
What is C2H5OH+3O2>CO2+H2O balanced?
November 28, 2012

CALCULUS
what is the area in square units of the region under the curve of the function f(x)=x+3, on the interval from x=1 to x=3? 10 12 14 16 18 ?
November 27, 2012

Physics, science,
I'm desperate Please help 2. A bird, starting from rest, accelerates at 3 m/s2 north for 5 seconds. It then sees the rest of its flock and turns due east accelerating from its previous speed to 20 m/s in 2 seconds. A. What is the velocity of the bird after the initial leg...
October 12, 2012

Thanks
Thanks Deborah i needed help.
October 9, 2012

English
Yes
October 3, 2012

Trig
A 16 - foot ladder leaning against the side of a house reaches 12 feet up the side of the house. What angle does the ladder make with the ground
September 23, 2012

history
thanks !? lol
September 19, 2012

history
2 big important facts about the 13 amendment.
September 19, 2012

u.s. history
thank you soo much(:
September 18, 2012

u.s. history
What came in order? 1.)abraham lincoln presidency 2.) jefferson davis presidency 3.) battle of bull run 4.) fort sumter
September 18, 2012

Science Struggle
Rocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 533 m/s in 2.45 s and can be brought to a stop again in 2.37 s. Find the acceleration of the sled when braking. Answer in units of m/s^2
September 13, 2012

physics
Rocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 533 m/s in 2.45 s and can be brought to a stop again in 2.37 s. Find the acceleration of the sled while accelerating. Answer in units of m/s2
September 13, 2012

physics
(A)Acceleration = -1.6 m/s Vi = 13.3 m/s Vf = 0 T(time) = ? T = Vf-Vi/A T = 0-13.3/-1.6 T = 8.3125 s
September 13, 2012

physics
With an average acceleration of −1.6 m/s^2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.3 m/s to a complete stop? Answer in units of s
September 13, 2012

Science
A 0.05 kg arrow with the velocity of 180 m/s is used to shoot a 5 kg block of wood off the top of a log. What will be the velocity of the arrow and wood after contact?
September 8, 2012

Science
A 1 kg poodle running right at 3 m/s has an elastic head on collision with a 9 kg basset hound walking left with a velocity of 1 m/s. After the collision the poodle bounces off to the left at 3 m/s. Whats the basset hounds velocity after the colllision?
September 8, 2012

Science
A 1000 kg car moves at 60 m/s. What braking force is needed to halt the car (change its momentum) in 6 s?
September 8, 2012

Math
State domain and range for f(x) = 2[x]
September 6, 2012

chemistry
E=hv h=6.6E-34Js E=5.1E-22k E/h=v 5.1E-22k/6.6E-34Js =
August 28, 2012

Chemistry
What would be the final concentration if 175mL of a 0.45M solution of sodium sulfite Na2SO3 are added to 650mL of water? Please reply with the steps on how to do this question so I can learn. I can't find examples or anything related in my textbooks and I take it via ...
June 14, 2012

Chemistry
If 125mL of a 1.10 NaCl solution is mixed with 105mL of a 0.850M CaCl2 solution but NO reaction takes place, calculate the final concentration of each of the ions in the final solution. Please reply with the steps on how to do this question so I can learn. I can't find ...
June 14, 2012

Chemistry
A 15.0mL solution of H2SO3 is neutralized by 12.0mL of a standardized 1.00M NaOH solution. What is the concentration of the H2SO3 solution? Please reply with the steps on how to do this question so I can learn. I can't find examples or anything related in my textbooks and ...
June 14, 2012

chemistryy
The reaction between 34.0 g of NH3 and excess oxygen gas produces 45.9 g of NO gas and some water. Determine the percent yield.
May 18, 2012

chemistryy
The reaction between 34.0 g of NH3 and excess oxygen gas produces 45.9 g of NO gas and some water. Determine the percent yield.
May 18, 2012

english 1 honors
In the writer by richard wilbur what does the speaker compare his daughter to?
May 7, 2012

Geometry
If AB= 9 centimeters and BC= 12 what does Ac equal ? and it is a right triangle .
April 16, 2012

physics
C. now answer my question please !
April 16, 2012

general chem
A certain monoprotic weak acid with Ka = 0.49 can be used in various industrial processes. (a) What is the [H+] for a 0.191 M aqueous solution of this acid and (b) what is its pH? Round the [H+] to three significant figures and the pH to two places past the decimal and do NOT ...
March 25, 2012

general chem
A certain monoprotic weak acid with Ka = 0.49 can be used in various industrial processes. (a) What is the [H+] for a 0.191 M aqueous solution of this acid and (b) what is its pH? Round the [H+] to three significant figures and the pH to two places past the decimal and do NOT ...
March 25, 2012

math
40% of the 25 students in the class are boys. Write 40% as a fraction? Then find the ratio of girls to boys
March 8, 2012

algebra
a landscaper uses square tiles to make garden paths the ends of the paths are always 2 tiles wide, and the center portions of the paths are 3 tiles wide. what eqation gives the total number y of tiles needed to make a path with a length of x tiles. the landscaper has 100 tiles...
February 26, 2012

statistics
Among coffee drinkers, men drink a mean of 2.8 cups per day with a standard deviation of 0.5 cups. Assume the number of drinking per day follows a normal distribution. What proportion drink 3 cups per day or more?
February 20, 2012

algebra, please help
(y^2 + 10y + 25)/(y^2 - 9) * (y^2 + 3y)/(y + 5) (y+5)(y+5)/(y+3)(y-3) * y(y+3)/(y+5) (y+5)/(y-3) * y/1 y(y+5)/(y-3) or y^2+5y/y-3
December 7, 2011

physics
A car is safely negotiating an unbanked circular turn at a speed of 17.2 m/s. The maximum static frictional force acts on the tires. Suddenly a wet patch in the road reduces the maximum static frictional force by a factor of three. If the car is to continue safely around the ...
November 22, 2011

Math-Algebra 2
Ace Rent a Car charges a flat fee of $15 and $0.25 a mile for their cars. Acme Rent a Car charges a flat fee of $30 and $0.17 a mile for their cars. Use the following model to find out after how many miles Ace Rent a Car becomes more expensive than Acme Rent a Car. c= 15+0.25m...
October 27, 2011

math
Lcm of 2 and 3
October 19, 2011

physics
A. m1a1=T-m1g and m2a2=T-m2g are your two equations, substitute and add and you get this --> T= (2xm1xm2)/(m1+m2) all multiplied by 9.8 (g). T= (2(3.0)(7.0))/(3+7) = 4.2(9.8) = 41.16 N B. Then just plug it in to one of your original equations. m1a1 = T-m1g (3.0)a = (41.16N...
October 14, 2011

Algebra
The sum of two consecutive odd integers is 56. A. Define a variable for the smaller integer. B. What must you add to an odd integer to get the next greater odd integer? C. Write an expression for the second integer. D. Write and solve an equation to find the two odd integers.
October 14, 2011

chemistry
20.0 g of CH3OH is frozen solid at -98.0 degrees C. What is the total energy required to melt it, warm the liquid to its boiling point, and then just vaporize it?
October 6, 2011

math
Fraction simplest 12 over 210
September 25, 2011

geometry
Given that ABC 53-x with a leg of 28 ~ DEC, x+3 with a leg of 4 find the value of x. If necessary, round your answer to two decimal places.
May 17, 2011

science
list 10 examples of slow changes over a long time. list 10 examples of quick changes over a short time.
April 13, 2011

ALEGBRA1
the point (-1,6) would be in quadrant 2.
April 13, 2011

math
George has a large circular table with a circumference of 18 feet. What is the approximate area of the table?
April 12, 2011

statistics
Assume that you own a small factory. A critical piece of machinery in your factory will need to be replacedin 180 days. If the machinery does not show up on time, you will need to shut down until it arrives. This might cause you to permanately lose customers.When you order the...
March 29, 2011

algebra (quadratic formula0
or the period 1990-2003, the amount of biscuits, pastas, and noodles y (in thousands of metric tons)imported into the united states ca be modeled by the function y=1.36(xsquared)+ 27.8x+304 where x is the number of year since 1990. a.write and solve an equation that you can ...
March 22, 2011

algebra (parabolas)
you throw a wad of used paper towards a wastebasket from a height of about 1.3 feet above the floor with an initial vertical velocity of 3 feet per second. a. write and graph a function that models the height h (in feet) of the paper t seconds after it is thrown b. if you miss...
March 20, 2011

algebra (parabolas)
find the axis of symmetry and vertex of the function. tell whether it goes upward or downward. 1. y=-xsquared+9 2. y=-2xsquared=7x-21
March 20, 2011

algebra (parabolas)
find the axis of symmetry and vertex of the function. tell whether it goes upward or downward. y=3*xsquared+6x-2
March 20, 2011

algebra (parabolas)
tell whether the graph opens upward or downward. then find the axis of symmetry and vertex of the graph of the function 1. y=xsquared-5 2. y=-2*xsquared+6x+7
March 20, 2011

social studies
never mind. a friend helped me.
March 16, 2011

social studies
my teachers do not want us on Wikipedia.
March 16, 2011

social studies
1. define Allah 2. the word Muslim means...? 3.JIHAD means to strive... what are Muslims striving for? 4. list and describe 5 contributions of Muslims to our lives today
March 16, 2011

polynomials
6. Simplify: 4x2yz2 2z Select answer A 2x2y2z2 Select answer B 2x2z Select answer C 2x2yz2 Select answer D 2x2y Select answer E 2x2yz
February 28, 2011

social studies
name 2 ways that it might affect our society if no one volunteered to help others.
February 28, 2011

algebra
The value of a certain two-digit number is eight times he sum of its digits. if the digits of the number are reversed the result is 45 less than the original number. find the original number. **please show both equations and work... thanks =)
February 28, 2011

6th grade science
What is the 47th element in the periodic table?
February 22, 2011

algebra
please write and equation, show your work, and find the answer: 1.a certain two-digit number has a value that is seven more than six times the sum of its digits. the tens digit is 3 more than the units digit. find the number 2.In Colorado Creek, Darrell can row 24km downstream...
February 16, 2011

chem.
physical or chemical property sodium metal fohrmhs an oxide when heated with oxygen?
February 16, 2011

Chemistry
calculate the enthalpy change in delta H foor heating 250 grams of liquid water from 0 degrees celcius to 100 degrees celcius.
February 11, 2011

earth
I DONT NO
February 2, 2011

algebra
ok thanks!
January 31, 2011

algebra
okaaaay im starting to get it. so what would the second equation be again? and can you please explain it? =) thanks!
January 31, 2011

algebra
ya i did today. but i dont understand how you got 24 as the y-intercept
January 31, 2011

algebra
i do not think that is what my teacher was asking for.
January 31, 2011

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