Saturday

April 25, 2015

April 25, 2015

**Chemistry**

Define the-half of a reaction. Explain on the molecular level why the half- life of a first-order reaction is constant
*Saturday, February 28, 2015 at 8:22am*

**Chem **

What simplifying assumptions do we usually make in working problems involving equilibria of salts of polyprotic acids? Why are they usually valid? Answer by selecting all true statements. Are the answers: a,b,d,and f A)If the two ionization constants are not very different the...
*Friday, February 27, 2015 at 11:48pm*

**statistics**

A headline in a certain newspaper states that "most stay at first job less than 2 years." That headline is based on an online poll of 320 college graduates. Among those polled, 72% stayed at their first full-time job less than 2 years. a. Assuming that 50% is the ...
*Friday, February 27, 2015 at 4:00pm*

**PSYCH**

1 Which of the following is NOT one of the three fundamental features of science? a empirical questions b public knowledge c mathematical equations (My Answer) d systematic empiricism 2 A set of beliefs can be said to be pseudoscientific if it lacks one or more of the three ...
*Friday, February 27, 2015 at 3:27pm*

**Language Arts**

Which of the following sentences contains a pronoun in the objective case? A. What costume should I wear to the party tonight? B. Maybe Martha will loan me something. C. Her costumes are always the best. D. She won first prize in a Halloween contest last year! Is the answer A ...
*Friday, February 27, 2015 at 2:11pm*

**physics **

A radio station, broadcasting at 89.1 MHz on the FM dial, has two transmission towers d = 40.0 m away from each other, producing signals that are completely in phase. An avid fan of this station is listening to it on her portable radio while jogging directly toward one of the ...
*Friday, February 27, 2015 at 2:01pm*

**Psychology**

1 Which of the following is NOT one of the three fundamental features of science? a empirical questions b public knowledge c mathematical equations (My Answer) d systematic empiricism 2 A set of beliefs can be said to be pseudoscientific if it lacks one or more of the three ...
*Friday, February 27, 2015 at 12:54pm*

**American Constitutional Law**

The powers belonging to the people and the states are enshrined in: A. the First and Second Amendments. B. the Thirteenth and Fourteenth Amendments. C. Article III. D. the Ninth and Tenth Amendments. Is it C?
*Friday, February 27, 2015 at 11:40am*

**Math**

What is the probability of getting a number larger than 10 for the first time on the third roll
*Friday, February 27, 2015 at 2:26am*

**Statistics**

Let x and y be the amounts of time (in minutes) that a particular commuter must wait for a train on two independently selected days. Define a new random variable w by w = x + y, the sum of the two waiting times. The set of possible values for w is the interval from 0 to 2a (...
*Friday, February 27, 2015 at 2:12am*

**math**

first string sports can purchase sneakers for $450 per dozen less trade discounts of 14/12 from ideal shoes. Fancy footwear is offering the same sneakers for $435 less trade discounts of 18/6. Which supplier offers a lower net price? would i be correct if i said first string ...
*Friday, February 27, 2015 at 12:11am*

**chemistry**

The rate of removal of Aspirin from the body is a first order reaction with a rate constant,k = 0.34/h How long does it takes for 87.5% of Aspirin to be removed from the body?
*Thursday, February 26, 2015 at 11:03pm*

**ela**

I'm analyzing JFK's speech for concession and counter argument. In this paragraph, I'm confused which is the counter and which is the concession. 1 "Some say that it is useless to speak of world peace or world law or world disarmament-and that it will be ...
*Thursday, February 26, 2015 at 9:06pm*

**Math**

John and Miles each had some money. First Miles gave John a quarter. Then John gave Miles one-third of his money. Then Miles gave John one-third of his money. At the end, John had $2.50 and Miles had $2.00. How much did they each start with?
*Thursday, February 26, 2015 at 7:37pm*

**Economics**

What are the conditions of China's economy in transition these past few years? How does it benefit(or harm) the country Switzerland? If it benefits Switzerland, how will Switzerland's IMF(international monetary fund)be affected or act towards it? And if it harms ...
*Thursday, February 26, 2015 at 7:21pm*

**Art**

Protecting and Respecting Art 1. Which exhibit would be the least likely choice for a museum specializing in European art? :Renaissance Art :Medieval religious panels :Temple Art*** :Baroque Art 2. A Chinese watercolor painting contains an image of a bird resting peacefully on...
*Thursday, February 26, 2015 at 1:41pm*

**physics**

Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 21.0 m/s. Both screech, one emitting a frequency of 3200 Hz and the other one of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
*Thursday, February 26, 2015 at 1:38pm*

**physics**

Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 21.0 m/s. Both screech, one emitting a frequency of 3200 Hz and the other one of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
*Thursday, February 26, 2015 at 1:37pm*

**physics**

Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 21.0 m/s. Both screech, one emitting a frequency of 3200 Hz and the other one of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
*Thursday, February 26, 2015 at 1:37pm*

**Math**

The table below shows the number of students from different classes of two schools who participated in a sports competition: School A 25 21 2 22 20 21 20 23 1 School B 3 2 1 5 4 2 3 4 3 Part A: How can you use box plots to compare the median and interquartile range of the data...
*Thursday, February 26, 2015 at 12:12pm*

**sociology**

All of the following reasons cause a variance in divorce rates among segments of the population in the United States, except: (Points : 3) 1. Age at first marriage 2. Education 3. Race and ethnicity 4. Social class <-------- Please check my answer.
*Thursday, February 26, 2015 at 10:14am*

**Physics**

Two men of the same mass climb the same flight of stairs. The first man climbs the stairs for 25 seconds, while the seconds person takes 35 seconds. Which man does the most work?
*Thursday, February 26, 2015 at 4:58am*

**INTEIER DESIGN**

When you have completed your exam and reviewed your answers, click Submit Exam. Answers will not be recorded until you hit Submit Exam. If you need to exit before completing the exam, click Cancel Exam. Questions 1 to 20: Select the best answer to each question. Note that a ...
*Thursday, February 26, 2015 at 12:45am*

**physics**

Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 23.0 m/s. Both screech, one emitting a frequency of 2600 Hz and the other one of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
*Wednesday, February 25, 2015 at 7:40pm*

**OSSEC**

WITH THE AID OF DIAGRAM EXPLIAN SYRING
*Wednesday, February 25, 2015 at 4:46pm*

**Language arts **

In the first stanza, while lines rhyme? A. Lines 1 and 3. 1. It shall flash through coming ages, 3. And eyes now dim with sorrow B. Lines 2 and 4 2. It shall light the distant years; 4. Shall be brighter through their tears. C. Lines 3 and 4 3. And eyes now dime with sorrow 4...
*Wednesday, February 25, 2015 at 4:39pm*

**English**

Composition needs to be three to five paragraph long. It must contain an introduction, a body, and a conclusion. Please read!!. Compare and contrast in the winter and driving in the summmer. Throughout the year, safe driving should always be a top priority. Especially when ...
*Wednesday, February 25, 2015 at 4:14pm*

**Organic Chemistry**

Looking down C2-C3 of 2-methylpentane, is the first newman projection staggered or eclipsed?
*Wednesday, February 25, 2015 at 3:55pm*

**History**

What made the Knights of Labor interesting and important? Select one: a. They were the first group to try and organize unskilled, as well as skilled, workers b. They were the first group to try and organize women, as well as men. c. They were the first group to organize blacks...
*Wednesday, February 25, 2015 at 1:40pm*

**Maths**

In the sequence 3,p,q,24 are the first four terms.determine the values of p and q if the ,(a)the sequence is geometric .(b)the sequence is arithemetic
*Wednesday, February 25, 2015 at 1:06pm*

**how to start your own daycare basic steps**

off all the steps needed for setting up a child care facility the step that must come first is a.developing a business plan b.stating program goals c.assessing child care needs my answer is a
*Wednesday, February 25, 2015 at 9:33am*

**maths**

How do I plot three points on a graph if the first coordinate is equal to (-2.8) and the other two coordinates are unknown?
*Wednesday, February 25, 2015 at 4:40am*

**Math Algebra**

Explain why there are not a function f and an initial value x(sub)0, such that a function's first three iterates are x1=2, x2=2, and x3=8.
*Wednesday, February 25, 2015 at 1:08am*

**Probability**

Consider a sequence of independent tosses of a biased coin at times k=0,1,2,…,n. On each toss, the probability of Heads is p, and the probability of Tails is 1−p. A reward of one unit is given at time k, for k∈{1,2,…,n}, if the toss at time k resulted in...
*Wednesday, February 25, 2015 at 12:42am*

**Pre-Calculus(Trigonometry)**

An 8-m boom is used to move a bundle of piping from point A to point B. Determine the exact vertical displacement of the of the boom when the operator moves it form 30 degrees to 60 degrees. (Just need work checked) --------------------------------------- I drew two triangles ...
*Tuesday, February 24, 2015 at 10:42pm*

**Pre-Calculus ( Trigonometry)**

The point P(k, 24) is 25 units from the origin. If P lies on the terminal arm of an angle, theta, in standard position, 0 < theta < 360,determine the measure of theta. Unsure how to go on from here. I'd appreciate if someone can guide me through the first few steps ...
*Tuesday, February 24, 2015 at 8:54pm*

**Earth Science to Ms.Sue (urgent )**

18. The Cenozoic Era is also referred to as the A. Age of Dinosaurs. B. Age of Mammals. C. Age of Fish. D. First Era. B???
*Tuesday, February 24, 2015 at 5:58pm*

**physics**

A golfer takes two putts to sink the ball, one is (81.6 ft, 31.7 degrees N of E) and the other is (3.20 ft, 53.4 degrees W of N). What is the displacement of the single putt that would sink the ball on the first try? Well, what I did was make a diagram of the two vectors, I ...
*Tuesday, February 24, 2015 at 4:55pm*

**Electricity and Electronics**

A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the ...
*Tuesday, February 24, 2015 at 3:39pm*

**Algebra 2**

Describe an infinte geometric series with a beginning vaule of 2 that converges to 10. What are the first 4 terms of the series? I know r=4/5 Now what do I do
*Tuesday, February 24, 2015 at 12:53pm*

**la check**

which of the following is not a major point of view first person third person fourth person limited (THIS ONE)
*Tuesday, February 24, 2015 at 12:35pm*

**Chemist**

2NO(g) + Cl2(g) --> 2NOCl(g) If the reaction is second order with reapect to NO and first order with respect to Cl2, a.write rate equation b. What is the order of chemical reaction?
*Tuesday, February 24, 2015 at 9:40am*

**ALGEBRA**

given the function rule f(x)=x^2-3x+2, what is the output of f(-2) a -8 b 0****** c 4 d 12 What are the first four terms of the sequence represented by the expression n(n-1)-5? a -7,-5,-3,1 b -5,-10,-15,-20 c 0,2,6,12 d -5,-3,1,7******
*Tuesday, February 24, 2015 at 8:13am*

**Socials**

A few days ago I posted a question about an immigration diary during the great migration period(I will link it in a comment below) in which Ms Sue and Reed replied with some tips- thank you. I am starting to write some of the diary and I still have a few questions that I have ...
*Tuesday, February 24, 2015 at 1:21am*

**maths**

First two terms of AP are -5 and -7.find its 11th term
*Monday, February 23, 2015 at 9:09pm*

**English**

Okay, So I didn't post this one because I thought I had it right.. but now im unsure. My school appeared on the news last week because we had made an important change in our community. Our 8th grade class had planted a large garden in what was once only a vacant lot. It ...
*Monday, February 23, 2015 at 8:04pm*

**English**

A food chain is part of a bigger system called a food web. That web links the living things in an ecosystem. The herbivores in that system depend on the plants. If the plants are removed, the herbivores cannot survive. Then the carnivores, the animals that eat other animals, ...
*Monday, February 23, 2015 at 7:27pm*

**geography**

how did japan first become introduce to chinese culture
*Monday, February 23, 2015 at 7:12pm*

**math concepts**

Sarah understands that if there are 11 ones, the first 10 move over to the tens column as one unit (i.e., one group of 10). What concept does this understanding represent? A. Renaming B. Regrouping C. Borrowing D. Place value my answer a.
*Monday, February 23, 2015 at 6:07pm*

**Math**

The 5th term of an arithmetic sequence is 22 and the 15th term is 62. Find the 100th term and the sum of the first 60 terms.
*Monday, February 23, 2015 at 5:14pm*

**Electricity and magnetism**

A carbon atom's nucleus and its electrons become separated by 20nm. How much work does it take to separate them in Joules? In the previous problem if found that the magnitude of the force the nucleus feels towards the electrons is 2.07*10^11N. My first attempt was W=F*d = ...
*Monday, February 23, 2015 at 2:30pm*

**social studies**

I need help check my answers. the * stands for my answer on 1 and 2 I have to answers cause im not sure if the answer is wrong I will put the 2nd answer later. 1. which of the following best describes daily life in the south during the civil war? about the same as before the ...
*Monday, February 23, 2015 at 12:29pm*

**Algebra 2**

Because of friction and air resistance, each swing of a pendulum is a little shorter than the previous one. The lengths of the swings form a geometric sequence. Suppose the first swing of the pendulum has an arc length of 100cm and a return swing of 99cm. On which swing will ...
*Monday, February 23, 2015 at 11:04am*

**Math**

it cost $2 to buy a raffle ticket. if there are 500 tickets sold, and there is one first prize of $250, three second prizes of $100, and five third prizes of $50, what is the expected value of this raffle?
*Sunday, February 22, 2015 at 10:49pm*

**Vocabs**

1. The extra money being raised by the band booster club has been (earmarked, maneuvered) to fund future trips. maneuvered 2. The Labrador retriever received a medal from the fire department for its( valiant, compact) act of saving a drowning man. valiant 3. Whenever I go out ...
*Sunday, February 22, 2015 at 8:05pm*

**Chemistry**

Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the concentration of SO2Cl2 is 45.5 μg/mL. You will ...
*Sunday, February 22, 2015 at 7:12pm*

**Math Help!**

I apologize for all these questions but I really need to get them done fast so I appreciate if you tried to answer some of them! 1. Bill is saving money in an empty jar. The first day he puts in a certain amount of money. Every day after the first he puts in 2 more dollars ...
*Sunday, February 22, 2015 at 5:41pm*

**English **

Five sentence paragraph. Preparing for a test should start the first day in class this includes paying attention in class,taking good notes,review all assignments on a regular basis. Budget your time make sure you set aside time to study. Ask your teacher to specify the area ...
*Sunday, February 22, 2015 at 5:34pm*

**Algebra**

The fifth term of an arithmetic sequence is 22 and the 15th term is 62. Find the 100th term and the sum of the first 60 terms
*Sunday, February 22, 2015 at 4:32pm*

**Management**

within an organization the first step in human resources planning is
*Sunday, February 22, 2015 at 4:07pm*

**Math**

Bill is saving money in an empty jar. The first day he puts in a certain amount of money. Every day after the first he puts in 2 more dollars than the amount he put in on the previous day. After 10 days he has put 200 dollars in the jar. How much money did he pit in the jar on...
*Sunday, February 22, 2015 at 3:25pm*

**Math**

1. Daniel wants to save at least 20 dollars by putting pennies in a jar daily. On first day, he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he pus n pennies into the same jar. Which day is the first day on which he has at ...
*Sunday, February 22, 2015 at 3:20pm*

**English **

Could someone read my five sentence paragraph. Before I turn it in. Thank u. To prepare to host a party or an event. The first thing I would figure out the date and location. Then I would sat down and figure out a menu,the guest list,entertainment. I would also seek input and ...
*Sunday, February 22, 2015 at 3:11pm*

**math**

A wire of length 4 m is cut in two parts and the first part is bent in the shape of a square, while the second part is bent in the shape of an equilateral triangle. For which lengths of these parts the total area enclosed by the square and the triangle is: a. minimized? b. ...
*Sunday, February 22, 2015 at 12:11pm*

**Math**

A wire of length 4 m is cut in two parts and the first part is bent in the shape of a square, while the second part is bent in the shape of an equilateral triangle. For which lengths of these parts the total area enclosed by the square and the triangle is: a. minimized? b. ...
*Sunday, February 22, 2015 at 10:44am*

**Trigonometry (Logarithmic Function)**

If log_10(2)=x and log_10(3)=y, then what is the value of log_10(15) in terms of x and y? *the first logarithmic equation reads: the logarithm of x with base 10 is is 2.
*Sunday, February 22, 2015 at 5:09am*

**math**

Inside a long empty cylinder with radius R = 25 cm is put a long solid cylinder with radius r = 10 cm such that the bases of the two cylinders are attached. Then water is poured in the remaining empty region of the first cylinder until the height of the water becomes 30 cm (...
*Sunday, February 22, 2015 at 3:50am*

**Math**

1. Daniel wants to save at least 20 dollars by putting pennies in a jar daily. On first day, he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he pus n pennies into the same jar. Which day is the first day on which he has at ...
*Sunday, February 22, 2015 at 1:53am*

**Chemistry**

A student added some bromine (reddish orange) in some carbon tertrachloride to a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left on the table top it was...
*Saturday, February 21, 2015 at 11:41pm*

**3 other questions.**

Sorry. Elizabeth wants to turn her diary entry into a fictional short story. Which BEST identifies a structural change that would allow readers to know more about the thoughts and feelings of Stevie and Elizabeth's parents? A)changing the point of view from first person to...
*Saturday, February 21, 2015 at 7:55pm*

**Math**

The fifth term of an arithmetic sequence is 22 and the 15th term is 62. Find the 100th term and the sum of the first 60 terms. I'm having trouble figuring out how to do this.
*Saturday, February 21, 2015 at 6:51pm*

**physics**

A 3.9kg block moving at 2.0 m/s toward the west on a frictionless surface has an elastic head-on collision with a second 0.80kg block traveling east at 3.0 m/s. a)Determine the final velocity of first block. Assume due east direction is positive. b)Determine the final velocity...
*Saturday, February 21, 2015 at 6:26pm*

**chemistry**

A student added some bromine (reddish orange) in some carbon tertra chloride ro a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left on the table top it ...
*Saturday, February 21, 2015 at 5:43pm*

**mathematics concepts**

Fraction symbols can usually be safely introduced A. at the beginning of third grade. B. near the end of first grade. C. near the end of third grade. D. at the beginning of second grade. my answer is c.
*Saturday, February 21, 2015 at 5:02pm*

**math concept**

Sarah understands that if there are 11 ones, the first 10 move over to the tens column as one unit (i.e., one group of 10). What concept does this understanding represent? A. Renaming B. Regrouping C. Borrowing D. Place value my answer is a
*Saturday, February 21, 2015 at 4:51pm*

**math**

A wire of length 4 m is cut in two parts and the first part is bent in the shape of a square, while the second part is bent in the shape of an equilateral triangle. For which lengths of these parts the total area enclosed by the square and the triangle is: a. minimized? b. ...
*Saturday, February 21, 2015 at 6:06am*

**trigonometry- college**

For two hours, a boat sails straight from port A to port C with a speed of 50 miles per hour. Port B is due east of port A, and the bearing of line segment BC is 20 degrees south west. Find the bearing of line segment AC. I really don't know what's the first thing to do.
*Saturday, February 21, 2015 at 1:02am*

**Socials**

Note: My questions are below mostly in brackets and at the very end! I have to do an immigration diary assignment and I am to portray a young 12 year old girl(any English name suggestions?) from a city in England(what is a realistic city during that time?) who is migrating to ...
*Friday, February 20, 2015 at 7:14pm*

**math.help pls**

A line segment with endpoints A(–4, 3, 2) and B(5, –6, –1) is translated first 2 units back, 3 units right, and 1 unit up. The image is then translated 7 units to the left. What are the coordinates of B´? A: (3, 4, 0) B: (3, –10, 0) C: (5, –6, &#...
*Friday, February 20, 2015 at 3:01pm*

**Math**

Please help me and show an understanding please, so I see how to figure them out. Lee deposited $28,000 in an interest-bearing checking account that earns 3.5% interest compounded daily. Find the amount after 68 days. a.$183.16 b.$28,180.46 c.$28,183.16 d.$180.46 On April 10th...
*Friday, February 20, 2015 at 1:52pm*

**english check answers **

France is one of the most popular tourist destinations in the world, and I discovered a few of the reasons why so many people visit the country during a recent excursion. While in France, I visited numerous world-famous landmarks such as the Eiffel Tower and the Champs-É...
*Friday, February 20, 2015 at 10:57am*

**english**

1. In the first line from "O Captain! My Captain!" what does "our fearful trip"refer to? (1 point) the Civil War the battle at Antietam Creek the presidency Lincoln's life
*Friday, February 20, 2015 at 9:05am*

**Probability**

The newest invention of the 6.041x staff is a three-sided die. On any roll of this die, the result is 1 with probability 1/2, 2 with probability 1/4, and 3 with probability 1/4. Consider a sequence of six independent rolls of this die. 1. Find the probability that exactly two...
*Friday, February 20, 2015 at 12:39am*

**Algebra 2**

The third and sixth terms of a geometric sequence are -75 and -9375 respectively. Find the first term, the common ratio, and an explicit rule for the nth term.
*Thursday, February 19, 2015 at 10:25pm*

**Finance**

You are interested in a new Ford Taurus. After visiting your Ford dealer, doing your research on the best leases available, you have three options. (i) Purchase the car for cash and receive a $1,900 cash rebate from Dealer A. The price of the car is $19,000. (ii) Lease the car...
*Thursday, February 19, 2015 at 9:09pm*

**Finance**

You are interested in a new Ford Taurus. After visiting your Ford dealer, doing your research on the best leases available, you have three options. (i) Purchase the car for cash and receive a $1,900 cash rebate from Dealer A. The price of the car is $19,000. (ii) Lease the car...
*Thursday, February 19, 2015 at 8:32pm*

**ALGEBRA**

Max charges $3.50 per hour when he mows lawns, plus $6.00 for transportation expenses. Which function rule represents the amount y Max charges to mow lawns for x hours? y = 9.50x y = 6.00x + 3.50 y = 3.50x + 6.00***** y = 2.5x The sale price of ground beef at a local grocery ...
*Thursday, February 19, 2015 at 3:33pm*

**LA **

When did William Shakespeare live? A. in the late fifteenth and early sixteenth century b. in the late sixteenth and early seventeenth century c.in the late seventeenth and early eighteenth century Answer A 2. Which is NOT one of the differences between literary works and ...
*Thursday, February 19, 2015 at 2:24pm*

**Algebra 2**

Describe an infinite geometric series with a beginning value of 2 that converges to 10. What are the first 4 terms of the series?
*Thursday, February 19, 2015 at 2:10pm*

**Algebra 2**

Because of friction and air resistance, each swing of a pendulum is a little shorter than the previous one. The lengths of the swings form a geometric sequence. Suppose the first swing of the pendulum has an arc length of 100cm and a return swing of 99cm. a.)On which swing ...
*Thursday, February 19, 2015 at 1:55pm*

**SCGC**

2.) A monthly cell phone plan charges $5.00 for the first 300 text messages used and $0.15 for each additional message. On this plan, what is the number of text messages that must be used in a month in order to make the average cost per message $0.05 ? a. 400 c. 900 b. 350 d. 500
*Thursday, February 19, 2015 at 1:47pm*

**Geometry II**

A conveyor belt carries supplies from the first floor to the second floor, which is 12 feet higher. The belt makes a 60° angle with the ground. How far do the supplies travel from one end of the conveyor belt to the other? Round your answer to the nearest foot. 21 ft 7 ft ...
*Thursday, February 19, 2015 at 12:59pm*

**Chemistry**

A reaction in which X and Y form products was found to be second order in X and first order in Y. By what factor will the rate of the reaction change if [X] is doubled and [Y] is tripled? a. 10 b. 12 c. 20 d. 2
*Thursday, February 19, 2015 at 11:05am*

**language arts**

Read the following hyperbole from Orpheus and Eurydice: “Rivers stopped flowing along the banks so that they could hear Orpheus, whose music was more harmonious than theirs.” What is the most likely reason that the author included this hyperbole? a)to emphasize the ...
*Thursday, February 19, 2015 at 10:34am*

**MATH**

In the arithmertic sequence series: a+(a+d)+(a+2d)+...+(l-d)+l,a is the first term,d the common difference and l the last term. how do prove that Sn=n/2[a+1]
*Thursday, February 19, 2015 at 7:06am*

**MATH**

A new sequence is formed by adding together the corresponding terms of a geometric sequence and an arithmetric sequence. the geometric sequence has a common ratio of 3 and the arthmetric sequence has a common difference of -2. The first two terms of the new sequence are 4 and ...
*Thursday, February 19, 2015 at 6:55am*

**math**

please explain #urgent the sum to infinity of a convergent series is 243. the sum of the first five terms is 242. how do you determine the values of the common ratio and the first term
*Thursday, February 19, 2015 at 6:48am*

**Chemistry**

Strong base is dissolved in 535 mL of 0.200 M weak acid (Ka = 3.16 × 10-5) to make a buffer with a pH of 4.04. Assume that the volume remains constant when the base is added. HA (aq)+ OH^-(aq) -> H2O(l) + A^-(aq) Calculate the pKa value of the acid and determine the ...
*Thursday, February 19, 2015 at 4:19am*

**Chemistry**

The reaction of NO and O2 produces NO2. 2 NO(g) + O2(g) „_ 2 NO2(g) The reaction is second-order with respect to NO(g) and first-order with respect to O2(g). At a given temperature, the rate constant, k, equals 4.7 x 10^2 M^¡V2s^¡V1. What is the rate of ...
*Wednesday, February 18, 2015 at 8:57pm*

**science**

1. The sporophyte generation produces spores that grow into a(n) (1 point) gametophyte. gymnosperm. angiosperm. pupa. 2. Placental mammals develop (1 point) in an egg laid in water. in a pouch on the mother’s body. inside the mother’s body. inside an amniotic egg. 3...
*Wednesday, February 18, 2015 at 6:44pm*