Saturday

July 26, 2014

July 26, 2014

Total # Posts: 196

**Chem 1120**

Oops, my problem states I2 is a gas. I forgot to include it. so does this change the equation?

**Chem 1120 **

The KC for the reaction I2 --> 2I is 3.8 x 10 ^ -5 at 727 degrees C. Calculate Kc and Kp for the equilibrium of 2I -> I2 at the same conditions. I don't understand how to set up or solve this problem. I know Kc=[I]^2 / [I2] = 3.8x10^-5 for the first equation but I do...

**gemotry **

The coordinates of the endpoints of AB¯¯¯¯¯ and CD¯¯¯¯¯ are A(2, 3), B(8, 1), C(5, 2), and D(6, 5). Which statement about the line segments is true?

**Math**

Using these numbers, 2 4/9, 2 5/9, 2 6/9, 2 8/9, 3, 3 1/9, 3 3/9, 3 4/9 & 3 5/9. Build a square where the sum of every horizontal, vertical, and diagonal row is 9. The square has 3 rows across & 3 rows down for a total of 9 small blocks.

**Maths**

A debate team of 4 is to be chosen from a class of 29 where the order in which the members of the team are chosen does not matter. There are two twin brothers in the class. How many possible ways can the team be formed which will not include any of the twin brothers?

**Language Arts**

What is the simple subject in this sentence? These homes are built up from the bottom of the pond. a. these b. homes c. pond

**Math**

I have 10 dozen potatoes which must be equally divided into 20 bags. How many potatoes will be in each bag?

**Math**

an airplane is flying a compass of 340 degrees at 325 mph. A wind is blowing with the bearing 300 degrees at 30 mph. Find the component form of the velocity, and find the actual ground speed and direction of the plane.

**Algebra 2**

Why couldn't the chicken find her egg?

**math**

My numerator is 6 less than my denominator. I am equivalent to 3/4

**math**

thanks steve

**math**

My numerator is a prime number. The GCF of my numerator and denominator is 2. I am equivalent to 1/5.

**math**

Thank you so much chelle

**math**

My numerator is divisible by 3. My denominator is divisible by 5. My denominator is 4 less than twice my numerator. plz help very confused!

**Math**

How do I find a fraction equivalent to 3/4 with a numerator that is 6 less than my denominator.

**chemistry**

I still desperately need help guys! Homework due TOMORROW!

**chemistry**

Please explain, in simple English, why is milk a colloid?

**Physics**

Vector V1 is 6N along the negative axis. Vector V2 is 4.5 N and point 45 degrees north of the x axis. Find the x and y components of each vector and find the resultant R=V1+V2with the components.

**physics**

an eraser

**Physics **

A 2 g bullet flying at 390 m/s hits a 2.7 kg aluminum block at room temperature and embeds itself in the aluminum. After everything has come to equilibrium, how much has the entropy of the aluminum block increased?

**physics**

A 1700 kg car moving south at 19.5 m/s collides with a 2050 kg car moving north. The cars stick together and move as a unit after the collision at a velocity of 5.16 m/s to the north. Find the velocity of the 2050 kg car before the collision. m/s to the north

**Physics**

Imagine that if you drop an apple from a certain height, its final speed is 20 m/s when it reaches the ground. If you throw the apple vertically downward from the same height with an initial speed of 20 m/s, what will be its final speed? I tried 2mgh=1/2mv^2 so that the mass w...

**Physics**

A spring has an unstretched length of 9.8 cm. The potential energy stored in the spring is V when the spring is streched to a length of 11.8 cm. What is the stretched length of the spring when its potential energy is 2.2 V? What compressed length will result in a potential ene...

**Calculus**

Determine whether Rolle's Theorem can be applied to f on the closed interval [a,b]. If Rolle's Theorem can be applied, find all values of c in the open interval (a,b) such that f'(x)=0. f(x) = x^(2/3) - 1 [-8,8] I plugged in both values and found out that they both...

**math**

Hi! I'm Maddie. I need some help on my homework. Here are three problems I need help with: A bowl contains only red marbles, blue marbles and green marbles. The probability of selecting a red marble from the bowl is 3/13. The probability of selecting a blue marble from the...

**Math**

Assuming lambda=0.02 and t=50, compute P(2)

**Math**

What is the range of values of the probability of an event?

**math**

You want to put $4,000 in a simple interest account. It has a 2.5% annual interest rate. How long will it take you to earn $500 in interest?

**Math**

How do you add fractions??

**physics**

What would be the final temperature when 125g of 25 degrees Celcius water is mixed with 85g of 45 Degrees Celcius water? ( hint: Equate the heat gained by the cool water with the heat lost by the warm water.)

**7th Grade Language- Arts Ms.Sue~!**

I just did the test and got 100% 1: A 2: c 3: B 4: D 5: B

**Math**

How do you find the total number of maximum and minimum points of the function whose derivative is given by f^1(x)=x(x-3)^2(x+1)^4 ???

**Chemistry**

Calculate the pH at the equivalence point when 50 mL of 0.098 M propionic acid is titrated with 0.340 M NaOH. I tried solving for the volume of NaOH and them using the total volume and then plugging it in to [H+][A-]/[HA] and used the Ka value for propionic acid but it was not...

**Chemistry**

Calculate the pH of a buffer solution that contains 0.60 M NaH2PO4, and 0.26 M Na2HPO4.

**Chemistry**

The pH of an 0.0870 M solution of weak acid A is 2.20. The pH of an 0.0830 M solution of weak acid B is 4.07. The pH of an 0.0890 M solution of weak acid C is 5.13. Identify the three acids from among those listed below (the Ka values are listed in Appendix E of your textbook)...

**Chemistry**

I'm not really sure how to go about doing this problem... What is the pH of a 7.40 x 10-3 M solution of NH4Cl? Help is appreciated! Thank you

**algebra**

write and inequality describing this region. will an 18 wheeler hold 71 refrig's and 118 tv's or will it hold 51 refig's and 176 tv's?

**Chemistry**

Awesome! Thank you

**Chemistry**

An aqueous antifreeze solution is 31.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.039 g/cm3. Calculate the molality of the ethylene glycol.

**Chemistry**

Thank you :)

**Chemistry**

A solution of hydrochloric acid (HCl) contains 22.5% hydrochloric by mass. What is the molality of this solution I'm not sure how to start this problem...

**Chemistry**

maybe my homework set online is messed up because it is not taking either of these answers :( sorry. But thank you both for your help!

**Chemistry**

hmmm for some reason this did not work... How did you go about solving this problem? Could any of them be a tie?

**Chemistry**

Rank the following compounds in order of their solubility in water. (most soluble = 1 -- least soluble = 4)--Note that for the same solubility rank the same (a tie). (CH3)2CHOH HOCH2CH(OH)CH2OH CH3CH2OH (CH3)3COH

**Chemistry**

Thank you so much!

**Chemistry**

What is the molarity of nitrate ions in a solution containing 2.20 mg of Mg(NO3)2 dissolved in 7.35 L of water?

**math**

If x = 15 units, y = 7 units, and h = 4 units, then what is the area of the trapezoid

**Algebra**

Find the integers from 1 to 144 which are perfect squares and write the square root of each one.

**Math**

Ten boys are to share 3 3/4 pounds of candy equally. How much candy does each boy get?

**Math**

1). How many shelves each 2 3/4 feet in length can be cut from a piece of lumber that is 15 2/3 feet long?

**Chemistry**

What mass of CH4 is contained in a 443 mL sample of CH4 at −32◦C and 282 torr? Answer in units of g. I tried so many times and I don't get it!

**Urgent language arts**

True of false 1. In a persuasive essay, the thesis statement should represent an opinion. A. True B. False 2. The most common structure of a persuasive essay is A. Order of importance B. Chronological order C. Problem and solution 3. Which of the following is NOT a sentence A....

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y

**trig**

If tan y = -4/3 and y is in Q I'VE find cos 2y

**math**

a ship sail S 40 degrees W four 4 hours how do i figure out this question

**math**

A ship sail S 40 degrees W for 4 hours at 30 kph. make a scale drawing

**Physics A**

how much work is being done a bookshelf being pulled 5 meters at an angle of 37 degrees from the horizontal? The magnitude of the component of the force that does the work is 43 Newtons

**Physics**

An airplane flies due north at 260 km/h with respect to the air. There is a wind blowing at 60 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?

**Physics**

An airplane flies due north at 260 km/h with respect to the air. There is a wind blowing at 60 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?

**Algebra**

write the standard form of the equations: through (1,3) and (-4, -4) through (5,4) and parallel to y=4

**Algebra**

write the following in standard form: slope= 2/3 y- intercept= 3

**5th grade word problems**

5 3 -- * -- 100 x 5x=300 x=60 1. put 5 over 100, oranges over oranges. And 3 over X. glasses over glasses 2. cross multiply, 5*x and 100*3 3. divide both sides of the equation by 5 to get x by it's self. 4. X=60, you can make 60 glasses with 100 oranges

**Science**

oh I get it now, thank you

**Science**

um sorry but Ms.Sue it's not supposed to be the separate functions but how it all ties together

**Science**

I have this last question left and I'm stuck!!! Explain how cell organelles are similar to a factory. Must be 1/2 a page.

**math**

Grapes cost $2 per pound. How much does the given amount cost? 0.25 pounds.

**math**

There are a total of eight possible outcomes for three coins: HHH, HHT, HTH, THH, TTH, THT! HTT, TTT. Out of these eight outcomes, seven of these show at least one tail (all except HHH). After counting, we find that six of these seven outcomes have at least one head, so the pr...

**Math **

Factor the polynomial completely. 6x^3 + 36x^2 - 240x

**Science**

The sun emits billions of watts of light,heat,and energy ever second. How much of this light,heat, and energy does the Earth benefit from?

**calculus**

FInd the area of the region bounded by the graphs of y= 3x^2+1 , y=0, x=-2.7, x=2.5

**8th grade math**

what does the problem look like?

**math**

12+ 2n=60 48= 2n 24= n :)

**Math**

(n-14)/ 12 = 248 n-14= 2976 n= 2990

**math**

make sure the ratio of the dimensions stays the same. say if you had a 3 x 4 picture you could change the dimensions to 6 x 8 and because they are the same ratio the image should not be distorted.

**Physical Education**

I have the ability to watch it, I'm just not allowed to because we have a bandwith limit.

**Physical Education**

That's the thing, the program doesn't /have/ an online teacher.

**Physical Education**

1. Aerobic activities can be done for an extended period of time and supply oxygen to your muscles. Such activities help develop _______________________. 2. You can change your _______________________ by exercising regularly and eating healthfully. 3. The _____________________...

**Pre Calc**

A plumber charges $40 per hour for labor with a minimum labor charge of $30. For example, if she does her repairs in only 0.2 hours, then $40*0.2=$8, which is less than the minimum, so she would charge $30 for labor. We will assume she can repair any problem in one day – ...

**math**

mae has a oval racetrack. 2 curves, each is 1/2 of the circle and each on a radius of 21". 2 straight-aways connect the circle and are 46" long. what is the total distance around the circle?

**math**

mae has a oval racetrack. 2 curves, each is 1/2 of the circle and each on a radius of 21". 2 straight-aways connect the circle and are 46" long. what is the total distance around the circle?

**Mixed numbers and improper fractions**

125/12

**Math**

Does anyone know the answer to the math riddle "Did you hear about..." the answer is 12 words and it's pg 167.

**chemistry**

A reaction occurs where the concentration of reactant A changes from 0.74 moles/liter to 0.63 moles/liter in 20 seconds. what is the average rate of reaction?

**social studies.**

15. What was a result of WWII on women’s rights in the US? A.Women were greatly oppressed and suffered setbacks B.Women lost the vote during wartime C.Opportunities for women increased D. None of the Above I believe its C ? 16. What happened with most of the working women...

**geometry**

solve this proof: PR is congruent to DE, PT is congruent to DF, Angle R is congruent to Angle E, Angle T is congruent to Angle F.. Prove Triangle PRT is congruent to Triangle DEF

**chemistry (please help)**

A 2.8-L engine in a vehicle with air-conditioning uses 26.5-L of coolant. If the coolant has a density of 1.11 g/ml, what mass does the coolant add to the vehicle?

**geometry**

If the length of a rectangle is twice its width, w, write an expression to represent the perimeter of the rectangle. If the perimeter of the rectangle is 72 inches, what is the length and width of the rectangle?

**Algebra**

What is 3y^2-27? Explain please.

**Math-geometry**

Do it yourself.

**math**

1. Consider the function f(x) = x3 + 7x2 + 2x - 40 . a. Find the possible rational roots of f(x) = 0. b. Use synthetic division to divide f(x) by x - 2. Show all your work. Use your answer to explain whether or not x – 2 is a factor of f(x). c. Factor f(x) completely. Sho...

**chemistry**

what sample size of .9181M vinegar would require 27.50 mL of .5185M of NaOH for neutralization?

**science**

what is the dencity of an object that has a mass of 92 grams and a volume of 40 milliliters? ~thx!

**math**

7x^2-20x=3

**Third Grade Math**

i think 1 gram but i need someone elses opinon....

**Third Grade Math**

I need a small button...

**Third Grade Math**

About how much does a button weigh? 1 gram 100 grams 1 kilogram 10 kilograms Thanks!

**math**

If there are 7:5 boys and girls in a class and there are 21 girls how many boy are there in the class?

**Chemistry**

I need help predicting the products and naming them using classes and subclasses. a. Br2+BaI2 b. CdBr2+Na2S c. H2+Br2 d. H3PO4+Ca(OH)2 (Numbers above are supposed to be in subscript form)