# Posts by aj

Total # Posts: 366

**Chemistry**

Given H2(g) + (1/2)O2(g) ---> H2O(l), dH = -286 kJ/mol, determine the standard enthalpy change for the reaction 2h2O(l) ---> 2H2(g) + O2(g) 2H2O(l) ---> 2H2(g) + O2(g) H2(g) + (1/2) O29g) ---> H2O (l) : dH = -286 kJ/mols 2H2O(l) ---> 2H2(g) + 2O2(g) : would dH ...

**Chemistry**

Write the balanced chemical reaction (showing appropriate symbols and states) for the chemical reaction with enthalpy change equal to and defined by the quantity dHformation [NH3(g)] N2(g) + 3H2(g) --> 2NH3(g) Is that all the question is asking for?

**Chemistry**

When .560 g of Na(s) reacts with excess F2(g) to form NaF(s), 13.8 kJ of heat is evolved at standard-state conditions. What is the standard enthalpy of formation of NaF(s)? Start off by balancing the equation: 2Na(s) + F2(s) ---> 2NaF(s) Then make it for one mole Na(s) + (1...

**Chemistry**

The enthalpy of formation for a substance corresponds to the enthalpy change for a reaction. Write the specific chemical reaction defining the enthalpy of formation of butane: Just checking to make sure this is correct: 4C + 5H2 ---> C4H10

**discrete math **

A bubble sort begins with the array: 372418 Work through the lists obtained at each step of the bubble sort. Complete the table below for the intermediate step where 7 is at position four in the array. [][][]7[][]

**Math**

my divisor is 5 I'm greater than 4 X 5 I'm less than 5 x 5 my remainder is 1 what dividend am I

**Maths**

There are 150 mangoes in basket p and basket q. 1/4 of the mangoes in basket p were yellow and the rest were green. 3/5 of the mangoes in basket q were yellow and the rest green. The number of green mangoes in both baskets were equal. How many yellow mangoes were there ...

**Maths**

Hi, I have checked and corrected all grammatical errors. Thanks

**Maths**

There were 150 mangoes in basket Q. 1/4 of the mangoes in basket P were yellow and the rest were green. 3/5 of the mangoes in basket Q were yellow and the rest were green. The number of green mangoes in both baskets was equal. How many yellow mangoes were there were there ...

**Maths**

There are 150 mangoes in basket p and basket q. 1/4 of the mangoes in basket p were yellow and the rest were green. 3/5 of the mangoes in basket q were yellow and the rest green. The number of green mangoes in both baskets were equal. How many yellow mangoes were there ...

**Algebra**

Translate into a variable expression. Then simplify the expression. Twice the sum of four times a number n and thirty. Can you explain how to write it as a variable expression pls Also what does "and" stand for here?

**Geometry**

Problem: ABCDE$\ is an equilateral pentagon with side length 2 in which angle B= angle E=120 degrees. The area of ABCDE can be expressed in the form square root of x + square root of y for some integers x and y. Find x+y. I don't understand. I really need help.

**Math**

A soccer field has a perimeter of 26 yards.if the width is 8 yards,how long is the length?

**PsyDAG How can i inteview you?**

remember that statistics assignment of ours? pleaseee

**Statisticians Interview only**

Is it okay if i can interview you? Please thank you so much how can i interview you

**Statisticians Interview only**

Hello are you a statistician? may I interview you? Thank you

**Science**

What is this for? I think too many sentences have grammatical errors... and be careful on your choice of words. Have you checked what moribund means really?

**Math Slope**

Jose the plumber charges $65 per hour to fix your plumbing. He uses the equation C=65H+100 to determine the charge of his services, C, after working h hours. What is the Y intercept? What does it represent in the context of the problem.

**Math**

A printer takes 5mins to print 90 copies of a repor. At this rate, how many copies of the same report can it print in 1/2 hours

**science**

2.6 billion

**algebra**

The sum of two numbers is 100. Such that the first number is twice as large as the second number, when the second number is subtracted by 1.

**Math**

A running track consists of two straight sections with semi-circular ends. If the straight sections measure 100 metres and one compete lap on the inside of the track measures 1/2 k, what is the distance x between the two straights?

**Calculus**

What is the maximum area of a rectangle that has sides along the positive x-axis and y-axis and lies below the line 3x+2y=1

**LA**

she cant read aloud duhh

**History **

eat my ass

**math**

I mean i guess so, 385 representatives are their based on the population of each state, and 2 senators for each state. It seems like the most fair way of representation.

**Algebra**

Rene used a $4 off coupon to buy bows which cost $2 each. Write an inequality rene could use to determine the number of bows she can buy if she plans to spen more that $8. Then graph the solution set

**Algebra**

note that x>0 (x) + 5 = 806 * (1/x) is your set up Simplify: x + 5 = (806/x) Multiply both sides by x x(x+5) = (806/x) * x x^2 + 5x = 806 Set to zero (x^2 + 5x - 806) = 0 Factor! :D (x-26)(x+31) = 0 Set each factor to 0 (x-26) = 0 x = 26 (x+31) = 0 x = -31 so, x = {26,31} ...

**Algebra**

x^2 + 6x - 17 = 0 First separate x terms X^2 + 6x = 17 or 17 = x^2 + 6x remember that aX^2 + bx + c to complete square, divide b by two, and square it. 6/2 = 3. 3^2 = 9. Now add 9 to each side of the equation 17+9 = x^2 + 6x + 9 combine like terms: 26 = x^2 + 6x + 9 Now factor...

**AR**

you can make 20 bags of 5 pounds apples (1/4) * 4 = 1 4 apples = 1 pound 20 apples = 5 pound (1 bag) 400/20 = 20 ----- * = multiplication / = division Hope this helps :^)

**Physics**

your equation is: E = (hc/Lambda) E = energy h = planck's constant (6.626 × 10^-34 joule·s) c = speed of light (2.998 × 10^8 m/s) lambda = wavelength 1) h*c = 1.99 × 10^-25 joules-m note: when dealing with photons and electrons, we usually use ...

**Science**

Pretty sure its 1) a 2) c 3) B Explanation if you want to know why 1) Because there is no more forward acceleration of the car, the friction from the tires and the weight of the car will slow down. the the potential energy will eventually become thermal energy because the ...

**Chemistry**

What mass of ammonium chloride must be decomposed to prepare 134 grams of ammonia (NH3). Hydrochloric acid will also be produced.

**Geography**

which demographic group is correctly matched with its issue A.religious people - farm subsidies B.midwesterners - farm subsidies C.single parents - affirnmative action D.all are matched correctly

**Computer Science/Pseudo Code Python**

okay so start off the program with a menu pattern. create an int or char called menuchoice Have variables (int or char) from 1-6 or A-F as your menu option After you coded your menu, let your user enter their 2 numbers. So create 2 for int variables (num1,num2). now either use...

**Programming**

Nothings really wrong, only states go off of 2 characters. texas: TX Thats really the only thing i can think of. No one knows what state "a" is but everyone knows that "AR" is Arkansas.

**College- US History**

How has popular culture reinforced Cowboys of the West?

**Math**

Prove that cot²A(secA-1) = Cos A

**Finance**

****HELP PLEASE**** Given the following information, answer the following: TR=$3Q TC= $1,200 = $2Q 1. what is the break-even level of output? 2. If the firms sells 1,300 units, what are its earnings or losses? 3. If sales rise to 2,000 units, what are the firms earnings or ...

**Maths**

In a box of markers there are eight which have dried up and will not write. The box contains 15 red, 15 purple, 5 black and 10 white markers. A marker is picked at random from the box. Find the probability that a) it is red b) it is not black c) it is purple or white d) it is ...

**science**

Boo is right, for connexus

**Maths**

The sum of two digits number is 7. In changing position of digits we get the number 9 less than the original number. What is number?

**PHYSICS**

If there is no dark matter, in order to explain our observations, our concepts of an important building block of the universe have to be incorrect. What is that building block and why do Astronomers overwhelmingly favor dark matter, which they cannot see, to explain our ...

**Physics / Astronomy**

If there is no dark matter, in order to explain our observations, our concepts of an important building block of the universe have to be incorrect. What is that building block and why do Astronomers overwhelmingly favor dark matter, which they cannot see, to explain our ...

**math**

how do I find how many times greater ? 9x10 to the 8 power is how many times greater than 3x10 to the 7 power?

**maths**

riposting this. the answer kindly supplied by Steve is beyond my understanding. all i want to know please is how long will the shadow be cast on the ground by a 3m tall vertical fence with the sun behind it as follows: THIS IS NOTHING TO DO WITH A LADDER A fence 3m tall is ...

**maths**

THIS IS NOTHING TO DO WITH A LADDER A fence 3m tall is erected vertically and parallel to a building that is 10m away please can someone tell me the maximum length of the shadow the fence will cast on the ground - thank you

**maths**

a fence 2m tall and 5m from a parallel building - what length is the shadow from the fence and how is this worked out?

**Math**

find the sum of 2 1/2 and 2/5

**Math**

2/3>3/ number that makes the statement true.. I am confused

**Defective probability i need help**

a. 0 = 0.0476 b. 1 = 0.1471 c. 2 = 0.2252 d. 3 = 0.2275

**Social Studies**

thanks Ms.Sue!

**Social Studies**

thanks

**Social Studies**

What was the main purpose of the settlers who established Jamestown? a.to trap animals and sell furs b.to find gold and silver c.to farm tobacco d.to collect sweetgrass for baskets Would it be B? I am thinking B,or C.

**Math**

The local health club is advertising a special for new members: no initiation fee to join and lnly $34.50 per month for the first year. If Andy joins the health club for one year, how much will he spend on membership?

**Math**

95.00

**Math**

How do I figure out this problem

**Algebra**

The time, t, required to drive a certain distance varies inversely with the speed, r. If it takes 12 hours to drive the distance at 60 miles per hour, how long will it take to drive the same distance at 85 miles per hour? A. About 7.08 hours B. About 5.00 hours C. About 1.42 ...

**algebraic modeling**

A toy manufacturer determines that the daily cost,C, for producing x units of a dump truck can b approximated by the function c(x)=0.005x^2-x+109 I got that the manufacturer must produce 100 units per day... What is the minimum daily cost?

**PLEASE HELP?????LANGAGUE ARTS**

do you go to connections academy?

**LA/READING(:**

do you go to connections acadmey?

**LA/READING(:**

are you sure

**math**

Why Was the Engineer Driving the Train Backwards?

**chemistry**

Thank a bunch

**chemistry**

What volume of 0.050 M AgNO3, silver nitrate solution is required to reat completely with 60.0 mL of 0.025 M K2S, potassium sulfide?

**Stats**

.638

**statistics**

observational study

**L.A**

Is that the answer Anna ?

**math -hw help**

Determine whether the following regular tetrahedrons have an edge length that is a whole number, a rational number or irrational number. The surface are of a tetrahedron is given by the equation: SA = √ 3s^2 Surface are of regular tetrahedron A = 1.5 Surface are of ...

**Science**

thank you

**math (factors and products)**

How could you use an area model to identify the binomial factors of a trinomial?

**Math**

How could you use an area model to identify the binomial factors of a trinomial?

**physics**

A soccer ball is kicked with an initial horizontal velocity of 16.5 m/s from a 92 meter high cliff. Determine the time it took the ball to reach the ground and how far the ball got from the edge of the cliff.

**Algebra2**

log2(x+8)-log2(5)=4

**arithmetic**

If you have 3 cups of pineapple juice and, how many total cups of punch can you make? Table: Ginger Ale - 40% OJ 25% Pineapple juice 20% Sorbet 15

**Math**

Write a word phrase for this algebraic expression. 6.5-h

**Physics(Science)**

Waves on a 5.0 m rope travel at a speed of 92 m/s. If the tension in the rope is 497 N, what is the mass of the rope?

**elementary**

Magic square 13.6

**Physics**

A dart is thrown horizontally with an initial speed of 14 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, vertically below P, 0.19 s later. (a) What is the distance PQ? (b) How far away from the dart board is the dart released?

**English**

how do I start an Auto Biography? I mean what sentence should i start it with?

**MATH HELP!!**

Thank you very much!

**MATH HELP!!**

Thank you,also can you explain and the number that it would make please

**MATH HELP!!**

SID WROTE 541,309 ON HIS PAPER. USING NUMBERS AND WORDS EXPLAIN HOW THE NUMBER WOULD CHANGE IF HE SWITCHED THE DIGITS IN THE HUNDRED THOUSANDS AND TENS PLACES

**trigonometry**

16.11

**cOLLEGE mAJORS**

ACCOUNTING VS IT WHICH IS HARDER? WHICH IS EASIER?

**math**

2^5/2 - 2^3/2

**Physics**

You are standing on a fish pond wishing to catch a fish. How would you aim your fish gun in order to catch a fish which your eyes could see 20 cm below the surface of water ? will u aim higher , lower or exactly on the location of the fish as seen by your eyes ? find out what ...

**Grammar**

Before the items that are complete sentences, write S. Before those that contain fragments, write F. Before a run on sentence, write RS. 1. We often walk through the woods, picking berries and listening to the birds. Is this a run on sentence?

**Science**

glogang #300

**english**

mr. dandy, Margarita can totally be a real name, like I know a lady with it. I wouldn't doubt it's her real name.

**math**

how can i plot values in a parabola graph if the values are fractions. it's my first time with this things so i don't understand

**Science**

All correct!

**english**

9 - C. 10 - C. Not sure about this one. 11 - C. 12 - C. 13 - A. Not sure about this one either. 14 - D. 15 - C. 16 - A. 17 - A. I'm pretty sure most of these are right.

**english**

I'm doing the test now if you still need answers.

**Math**

If I has plots of (3,2) and (8,6) how would I find the area in square units

**Math question**

Where is your answer?

**Physics**

A firefighter of mass 73 kg slides down a vertical pole with an acceleration of 5 m/s2. The acceleration of gravity is 10m/s2. What is the friction foce that acts on him? Answer in units of N

**Spelling**

Wordly wise 3000 book 7 lesson 7c vocab answers?

**Science**

Uranium-238 is less stable than oxygen-16. What accounts for this difference? (A) Uranium is a solid, while oxygen is a gas. (B) Unlike oxygen-16, uranium-238 has a nucleus in which repulsive electric forces surpass the strong nuclear forces. (C) Oxygen-16 has fewer electrons ...

**math**

9 ft