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Total # Posts: 1,311

Chem
The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...

Chemistry
Calculate the enthalpy of formation of maganese (IV) oxide based on the following information. 4Al(s) + 3MnO2(s) --> 3Mn(s) + 2Al2O3(s) Delta H = -1790 kJ 2Al(s) + 3/2O2 (g) ---> Al2O3 (s) Delta Hf = -1676 kJ

Chemistry
So i would change the sign of the second equation and add them?

Chemistry
The reaction through which carbon changes from graphite to diamond form is represented by the equation C(graphite) ---> C(diamond) delta H: ? Using the reactions below, determine the amount of heat absorbed in the change of one mole of graphite to one mole of diamond C(...

Chem
How did u get 4.186 kj?

Chem
Compound B is burned in a bomb calorimeter that contains 1.50 liters of water. When I burned 50.0 grams of compound B in the calorimeter, the temperature rise of the water in the calorimeter was 35.0 degrees C. If the heat of combustion of compound B is 2,150 kJ/mol, what is ...

Chemistry
Consider the following three reactions: Ca(s) + 2H2O(l) ---> Ca2+(aq) + 2OH^- (aq) + H2(g) CaO(s) + H2O(l) ---> Ca2+ (aq) + 2OH^- (aq) H2(g) + 1/2O2 (g) ----> H2O (l) Delta H = 430.75 kJ Delta H = 81.55 kJ Delta H = 285.63 kJ Determine Delta H for the overall reaction...

Chemistry
How much energy will be liberated upon the combustion of 12.5 grams of ethene? C2H4(g) + 3O2(g) ----> 2CO2(g) + 2H2O(g) Delta H = -1387.4 kj

Need ideas
It is for Religion class... Grade 12.. we are just supposed to explain the topic and connect it to the Catholic Church...

Need ideas
I am doing a presentation on Consumerism... I need ideas on activities that have to do with Consumerism I can do with the class... To engage them

Religion
How does St.Therse of Lisieux exemplify the qualities from the parable the Good Samaritan

life orientation
No guys plz help with answer not wat u r doing and let's help each other plz plz plz

Math
I need help coming up with a unique game that can be played at a carnival, amusement park or casino.... and u need to be able to explain the probabality of your game. Any ideas

maths
A.If 0 is less than or equal to thita is less than 360 ,find all possible value of thita such that : 1.Sin thita =0.5623

English
I have to write a point form outline for a short story... i need to start with a flashblack but not sure how? the topic: Your main character is an easy going 74-year old woman. The story begins in a doctors surgery. Your character is determined to get to the truth.

Math
The game of euchre uses the 10s, jacks,queen,kings and aces from a standard deck of 52 cards. How many 5-card euchre hands have at least 2 red cards? Explain your reasoning. What is this question asking me to find, this is what I don't understand

Math
You are setting up a system of programming codes for a universal TV remote. Each code will have five digits and cannot include a 0 or repeat any digits. How many codes: A) do not contain a 1? My answer: 8x7x6x5x4 = 6720 codes B)have 2 as the 2nd digit and 4 as the fourth digit...

Math
Expand (3-x)^7 Would i start like (3)^7(-x)0 etc....

Math
For a calculus quiz, the teacher will choose 11 questions from the 15 in a set of review exercises. How many different sets of questions could the teacher choose

Math
How many different sums of money can U make with 4 pennies, two nickels and six quarters

Math
Find the middle term in the expansion of (2x+3y)^12

Prob
A game is played using three 6-sided dice. You throw these dice one time and if the dice all show the same number ( triples), you win $ 40.00 . For this game to be “fair”, how much should a person pay to play this game ?

Math
In the expansion of (ax +by)^8, the first three terms are 256x^8, 6144x^7y and 64512x^6y^2. Find the values of a and b

Math
A new theme park will have five roller coasters, six water rides and eight suspension rides. How many different combinations of rides could you try at this park.

Data management check
A fabric store has 44 bolts of fabric on its clearance table. Of these bolts 28 are broadcloth, 17 floral prints, 22 have a blue background, 12 floral prints on broadcloth, 10 arare broadcloth with a blue background, and 5 are floral prints with blue background. If all but 2 ...

Data Management check
A fabric store has 44 bolts of fabric on its clearance table. Of these bolts 28 are broadcloth, 17 floral prints, 22 have a blue background, 12 floral prints on broadcloth, 10 arare broadcloth with a blue background, and 5 are floral prints with blue background. If all but 2 ...

Data Management
You are thinking of using some leftover ceramic tiles to make a decorative border for a patio. You have ten blue, four gold, and six white tiles. In how many ways can you make the border if it requires 15 tiles and you use only blue and white ones? Explain your reasoning. i ...

Data Management (need help)
Suppose that the SJCS and Mary Ward are in the basketball final. In this best-of-three series, the winner is the first team to win two games. There are 60% chances SJCS TEAM will win first game. If SJCS wins, there are a 70% chance of winning next game and if they lose there ...

Math
From the top of an 8m house the angle of elevation to the top of the schools flagpole across the street is 9 degrees The angle of depression is 42degrees to the bottom of the pole How tall is the flagpole

Social Studies
A, B, D, B, connections academy

Chemistry
If you make a solution in the laboratory that contains 0.1 M acetic acid (CH3COOH), what concentration of hydronium will you have once the solution equilibrates?

Chemistry
If you make a solution in the laboratory that contains 0.1 M hydrochloric acid, what concentration of hydronium will you have?

Chemistry
What is the strongest intermolecular force present in each molecule: H2S CF4 NH3 CS2 PCL3 N CH2O C2H6 CH3OH BH3 My work: Hydrogen bonding London dispersion Dipole dipole London dispersion Dipole dipole London dispersion Hydrogen bonding Hydrogen bonding Hydrogen bonding Am I ...

English
Identify the sentence with the correct end punctuation. 1.did you see the elephants 2.I saw a baby kangaroo 3.who found the way to the penguins 4.I miss the monkeys

history
What were arguments for maintaining the slave trade and slavery in general during the Constitutional Debates on Slavery? How did the delegates from Georgia and South Carolina in particular impact the debate?

Math
At a school of 1400 students, 800 are currently enrolled in English, 740 are enrolled in mathematics and 325 are enrolled in both subjects. How many students are enrolled neither English nor Mathematics? I got 650 is this right?

Math
A game show has three doors labelled A,B, and C behind which there may or may not be a prize. A group of contestants are asked behind which doors they think there is a prize. The results are that 18 people choose A, 19 people choose B, 19 people choose C, 4 people choose A and...

Social Studies
@Ms. Sue

Social Studies
Answer the following about the great wall of china: a.When, where, and why did it develop? b.How was it used or practiced? c. Whom did it affect? d.What was the lasting impact this innovation had on China and its people? e.What are some modern examples of the concept or product?

math
How would i solve for n nP5 = 14(nP4)

math
Solve the equation for n n!/(n-2)! = 90 I get n= 10 but when i plug 10 back into the equation i don't get 90 to check... My work: n!/(n-2)! =90 n(n-1)(n-2)/(n-2)! =90 i cancelled the n-2 and expanded the n(n-1) n^2 -1n -90 =0 (n-10)(n+9) = 0

Math
An explicit solution of a differential equation is: a) a simpler equation b) a real number c) a function on some domain d) an approximation e) a linear relation

Data Management
Simplify x^2 - xy + 2x/2x

Physics
a spring extends by 10 cm when a mass of 100g is attached to it. what is the spring constant?

math
The ratio of four less than a number to twenty six more than the number is 1:3 . what is the number?

Operations
Its McDonald's

Operations
We are talking for example McDonald's how does their work force reflect their global strategy?

Operations
Could someone what do they mean by this question please.How does their work force reflect their global strategy?

Math connexues
what are your answers? i cant check them with out seeing what you choose

algebra
the sum of two numbers is 6 more than three times the smaller and and their sum is 66. what are the numbers?

Science
Actually, -_- , number 8, is b. thank a lot that's what i got first but i thought u were right. Check your answers!!

global studies
this is a 20 question project and i could really use a lot of help :)

global studies
some polynewian islands are ring- shaped coral islands that surround a body of wate, or? a.)copra b.) coral c.)atolls d.)plates

Math
Find 5 ordered pairs that satisfy each relation. Draw each graph. 4. x+y=7 5. x+y=6 6. x-y=1 7. x-y=0 8. x+y=0 9. y-x+0

Maths
A ship is sighted from the top of a lighthouse. The angle of depression from the lighthouse to the top of the ship is 45 degrees. The distance from the top of the lighthouse directly to the ship is 4 miles. Calculate the horizontal distance of the ship from the bottom of the ...

Biology
When inserting a gene, a gene for antibiotic resistance were also added to the plasmid. Why is this done?

Biology
Explain the ramifications to the process of transcription if the following occurs: A) The termination sequence of a gene is removed

Biology
3'-GGCACTCGCATAATATTCGCCATGGCT -5' In the DNA sequence above, how do i identify the promoter region..

math
K is 9 years older than L after 7 years the total of their age is 93 so how old are they in each one of them?

Biology
What effects does epinphrine have on the excretory and endocrine systems.. i cant find any sites to help

Math
Thank you very much, happy holidays

Math
Solve simultaneously for the two equations for x and y 5x(cos 45) + 15y(cos 30) = 2,000 5x(sin45) - 15y(sin 30) = 0 I tried adding these two eqn. to elimate y and solve for x by adding [5 x cos 45] and [5 x sin 45] but the value for x is too high. Would I have to use trig ...

Physics
Search The statue of Isaac Newton is crated and moved from the Oxford Museum of Natural History and Science for cleaning same question there

Physics
Using W=mg W = (60 kg)(9.81m/s^2) = 558.6 N Weight = mass x surface gravity W (Mars) = (60 kg)(6.42x10^23)= 3.85 x 10^25 W (Saturn) = (60 kg)(5.69x10^26)= 3.41 x 10^28

Social Studies
A new coin system created by was adopted by Congress in 1785

History
so whats the answer

Math
A drug in the bloodstream has a concentration of c(t) =at/t^2 +b A= 3, b=1 Determine how long it takes for the drug to drop below 0.2 solve algaebraically Find algaebraically when c(t) less then 0.5

Math
A rectangular box with a square base of length x and height h is to have a volume of 20ft^3. The cost of the top and bottom of the box is 20 cents per square foot and the cost of the sides is 8 cents per square foot. Express the cost of the box in terms of: The variable x and ...

Math
The question also states to determine how long it takes for the medicine to drop below 0.2 how could i do this

Math
How would i approximate the highest concentration reached in the bloodstream

Math
A medicine in the bloodstream has a concentration of c(t) =at/t^2 + b where a=3 and b=1 Approximate the highest concentration of the medicine reached in the bloodstream Find algebraically when c(t) less then Sign 0.5

math
A drug in the bloodstream has a concentration of c(x) =3t/t^2 + 1 Approximate the highest concentration of the drug reached in the bloodstream Determine how long it takes for the drug to drop below 0.2. Solve algaebraically

Math
A drug in the bloodstream has a concentration of c(x) =3t/t^2 + 1 Approximate the highest concentration of the drug reached in the bloodstream Determine how long it takes for the drug to drop below 0.2. Solve algaebraically

Physics
true or false.Initial velocity is always equal to zero

Math
A drug in the bloodstream has a concentration of c(x) =3t/t^2 + 1 Approximate the highest concentration of the drug reached in the bloodstream Determine how long it takes for the drug to drop below 0.2. Solve algaebraically

Biology
How can i design an experiment to determine which wavelengths of light provide the optimal energy for photosynthesis

Biology
How do you think increasing temperature would affect the rate of photosynthesis?

chemistry
how many grams of CaCO3 will dissovle in 300ml of 0.05M Ca(NO3)2 ? Ksp of CaCO3 : 4.7x10^-9 M.W of CaCO3 100.01g/mol

Math
Thank you

Math
that is the answer that I got mixed number 1 13/30 but do you covert this to hour

Math
On Monday morning, Rosie naps for 3/5 hour. In the afternoon for 5/6 hour. How long does he sleep in all?

math
x^2 - 4 What are the: Intervals on which the graph is above the x axis Intervals on which the graph is below the x axis Intervals on which the function is increasing Intervals on which the function is increasing Im not sure how to write these intervals.. so then i can do the ...

math
Explain why the graphs of f(x) =x and g(x) =1/x are in the same quadrants over the same intervals. Does this relationship hold for m(x) = -x and n(x) = -1/x? Does this relationship hold for any function and its reciprocal function.

biology
How can i get air in a bag, into a beaker of solution?

Social Studies
I also need Greek Contributions too

Social Studies
Describe the Greek and Roman contributions to today's world.

math
a. Find the Z score z score = (X value - the mean)/ Standard Deviation (90,000 - 85,900)/11,000 = .372 Then find the probability of the Z score happening P(Z > .372) Note: Find the probability using a TI- 83/84 calculator. Keys: 2nd, Vars, Normalcdf (Lower:.372 Upper: 10,...

English
I want what if the story is 5 pages long how do you write the essay

Philosophy
Can someone help me understand this Aristotle quote from Book 2 of Nicomachean Ethics: Virtue, then, is a state of character concerned with choice, lying in a mean, i.e. the mean relative to us, this being determined by a rational principle, and by that principle by which the ...

Biology
The function of diastase and how it is affected by temperature. I got the function.. but i don't know how temperature affects diastase

MATH
on a map of Florida the distance between town A and town B is 2.6 cm if 2 cm=120 miles how many miles apart are the 2 town

math
The price of a small cabin is ​$45 comma 00045,000. The bank requires a​ 5% down payment. The buyer is offered two mortgage​ options: 20-year fixed at 6.56.5​% or​ 30-year fixed at 6.56.5​%. Calculate the amount of interest paid for each ...

Physics
On the question that someone posted.....I asked my teacher on what formula I should use and said I should use this one: V^2= Vo^2+2ax (V^2 is the velocit, Vo is the initial velocity, a is accerlation and x distance . An automobile is traveling at 30 km/hr. It accelerates at 3...

Math
f(0) = -2sin(4(0+45))-1 *the zeros is the symbol theta* Find the Amplitude,Period, Phase Shift and Vertical shift

Math
Given y=2x^2-10x. Find all real values of x for which y=-3

physics
a 0.8kg ball is kicked with the speed 20m/s at an 50 to the horizontal.calculate the kinetic energy of the ball at maximum height. m=0.8kg v=20m/s h=?

physics
1) a wire of length 1m has a resistance of 2 ohm.obtain the resistance if specific resistance is double,diameter is double and the length is made three times of the first.

Calculus
Find the area bounded by the y-axis and x = 4-y^2/3

Physics
In what position will a converging lens of local length 10 cm from an image of luminous object on a screen located 50 cm from the object.

Literature
the answer is C destiny as amistif

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