Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 199

**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?

**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.

**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 ...

**Chem**

THANKS. I figured it out.

**Chem**

how do i find the rate constant?

**Chem**

i got N=0.83 does the seem right?

**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?...

**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 wha...

**Spanish 2**

@SraJMcGin Was #2 correct also? Thanks! :)

**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? (le...

**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? (le...

**Chem 2**

Thanks so so much! I was really confusing myself! The steps really helped!

**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

**Chem 2**

when Im getting my Kf do i change it from Celsius to Kelvin before i do my calculation?

**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 s...

**Chem 2**

When i did the problem i got 0.76 but i think its wrong?

**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.

**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 t...

**algebra**

the larger of two numbers is 12 mo're than the smaller.Their sum 84. Find the numbers.

**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.

**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

**Science-Ms.Sue**

what about number 4 is tat also d i am trying to understand evolution much better.

**algebra**

what is negative one sixth times two and three fourths

**Math**

write an expression equivalent to -1/4(8y-10)

**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

**physics**

An athlete is running at a constant velocity with a javelin held in his right hand. The force he is applying on the javelin as he carries it is 5.0 newtons. If he covers a distance of 10 meters, what work has he done on the javelin?

**us history**

Why did Johnson request the Tonkin Gulf Resolution

**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

**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 ...

**pre cal**

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

**Expand binomial Pascal's triangle **

(p+q)^9

**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 &...

**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

**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?

**Chemistry**

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

**Chemistry**

What is C2H5OH+3O2>CO2+H2O balanced?

**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 ?

**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 ...

** Thanks**

Thanks Deborah i needed help.

**English**

Yes

**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

**history**

thanks !? lol

**history**

2 big important facts about the 13 amendment.

**u.s. history**

thank you soo much(:

**u.s. history**

What came in order? 1.)abraham lincoln presidency 2.) jefferson davis presidency 3.) battle of bull run 4.) fort sumter

**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

**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

**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

**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

**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?

**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?

**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?

**Math**

State domain and range for f(x) = 2[x]

**chemistry**

E=hv h=6.6E-34Js E=5.1E-22k E/h=v 5.1E-22k/6.6E-34Js =

**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 corre...

**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 exa...

**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 ...

**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.

**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.

**english 1 honors**

In the writer by richard wilbur what does the speaker compare his daughter to?

**Geometry **

If AB= 9 centimeters and BC= 12 what does Ac equal ? and it is a right triangle .

**physics**

C. now answer my question please !

**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 ...

**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 ...

**math**

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

**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...

**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?

**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

**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 c...

**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...

**math**

Lcm of 2 and 3

**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)...

**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.

**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?

**math **

Fraction simplest 12 over 210

**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.

**science**

list 10 examples of slow changes over a long time. list 10 examples of quick changes over a short time.

**ALEGBRA1**

the point (-1,6) would be in quadrant 2.

**math**

George has a large circular table with a circumference of 18 feet. What is the approximate area of the table?

**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...

**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 us...

**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...

**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

**algebra (parabolas)**

find the axis of symmetry and vertex of the function. tell whether it goes upward or downward. y=3*xsquared+6x-2

**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

**social studies**

never mind. a friend helped me.

**social studies**

my teachers do not want us on Wikipedia.

**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

**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

**social studies**

name 2 ways that it might affect our society if no one volunteered to help others.

**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 =)

**6th grade science**

What is the 47th element in the periodic table?

**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...

**chem.**

physical or chemical property sodium metal fohrmhs an oxide when heated with oxygen?

**Chemistry**

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

**earth**

I DONT NO

**algebra**

ok thanks!

**algebra**

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

**algebra**

ya i did today. but i dont understand how you got 24 as the y-intercept