Posts by jen
Total # Posts: 3,589

chemistry
which is a better cleansing agent, a 70% alcohol or a 40% alcohol? 
physics
a convex lens of an optical instrument needs to form an inverted image that is 4 times smaller than the object. how far from the lens should the object be placed? Answer: behind the double focal point. can someone explain this to me please? i have a similar question. A CONCAVE... 
Chemistry
The hybridization of nitrogen in FNO3 (or FONO2) I cannot for the life of me draw the spin diagram for the NO single bonds and NO double bonds. Sp2 hybridization?? I think? N is forming 3 sigma bonds and one Pi. 
chemistry
an unknown alcohol reacts with sodium salt but further tests show the compound to be an aliphatic hydrocarbon. what structural unit is probably present in the hydrocarbon? 
chemistry
theoretically, how much iodoform could be prepared from 25ml of 95% ethanol(sp. gr. 0.79)? 
chemistry
why would acyl halides give higher yields of amides compared to carboxylic acids or esters on reaction with NH3? 
chemistry
why should excess alkali be avoided in the ferric chloride test for acetic acid and benzoic acid? 
chemistry
Why do alcohols that show little tendency to dissolve in water appear to dissolve readily in 85% phosphoric acid? Would you describe the latter behavior as solubility or a chemical reaction? Explain 
chemistry
The aliphatic alcohols and ethers are isometric; seven structures may be written for the molecular formula, C4H10O. if you were required to identify an unknown of this formula, tell exactly how would you go about it. 
chemistry
theoretically, how much iodoform could be prepared from 25ml of 95% of ethanol(sp.gr. 0.79)? 
chemistry
an unknown reacts with sodium salt but further tests show the compound to be an aliphatic hydrocarbon. what structural unit is probably present in the hydrocarbon? 
chemistry
an unknown alcohol reacts with sodium salt but further tests show the compound to be an aliphatic hydrocarbon. what structural unit is probably present in the hydrocarbon? 
science
does 2napthol soluble in sodium hydroxide? in water? in sodium bicarbonate? 
science
does pchlorophenol soluble in sodium bicarbonate? 
Statistics and Probability
Let Y be the discrete random variable with probability function p(y) = (1/2)^(y+1) y = 0, 1, 2,... Find the momentgenerating function m(t) for Y. 
Statistics and Probability
Teams A and B play a series of games with the first team to win 4 games being declared the winner of the series. Suppose that team A independently wins each game with probability 0.6. Find the probability that team A wins the series. 
Science
When water is mixed with another substance and the mixture will not scatter light, the mixture is a:? 1) suspension 2) compound 3) solution 4) substrate 
Algebra
56 
math
The cost cc (in dollars) for the fuel and maintenance of a gocart is given by c=10x+900c=10x+900, where xx is the number of rides. It costs $25 per ride. How many rides does it take to break even? 
math
A cockroach traveling 2 feet per second takes how long to scurry a distance of 46 feet? seconds 
physics
A 751 kg block is pushed on the slope of a 30? frictionless inclined plane to give it an initial speed of 50 cm/s along the slope when the block is 1.3 m from the bottom of the incline. The acceleration of gravity is 9.8 m/s^2. What is the speed of the block at the bottom for ... 
Algebra pleaseee helppp
Canasta is played with two decks of 52 cards each plus the 4 jokers. A standard Canasta hand consists of 11 cards. How many hands are possible? 
Algebra
I'm getting a different answer 7.13 × 10^16 
Algebra
In the 2011 Canada general election, 166 Conservatives, 103 NDPs, 34 Liberals, 4 Bloc Quebecois, and 1 Green were elected. If an all party committee is to be formed consisting of 9 Conservatives, 5 NDPs, 2 Liberals, 1 Bloc Quebecois and 1 Green, how many different committees ... 
Algebra
canasta is played with 2 decks of 52 cards each plus the 4 jokers. A standard canasta hand consists of 11 cards. How many hands are possible 
Algebra
Thank you 
Algebra
Write in sigma notation 1/3,2/9,7/27,14/81,23/243,34/729... 
Algebra
Graph the solution set of the system of inequalities and give the exact coordinates of the intersection points of the related equations: y>x^2 8 X+y?1, The closest points I'm getting is (2.5,1.8) and (2.5,1.5) but I feel like they're incorrect 
CAlculuss
Solve the equations algebraivally, test the solution for validity, and graph the system to check your number of solutions. x^22y^2=2 xy=2 
CAlculuss
Thank you so much ! 
CAlculuss
Convert into standard form. Find any centres, vertices, foci, asymptotes, directices and axes of symmetry. 64x^236y^2512x216y=124 I found the centre (4,3), vertices (8.4,3) , (0.4,3), foci (0.1,4), (7.9,3). I'm having a hard time finding the asympyotes,... 
CAlculuss
Find, in standard form, the equation of : the parabola with focus at (3,5) and directrix at x=1 
texas historty
what action did spain take to prevent the Mexican war of independence from spreading to texas 
texas historty
what questions might steph Austin have asked himself before trying to solve a problem 
science
Why are the oldest rocks on earth on continental crusts? 
Equality Studies
I like to mow my neighbors of colors' lawns for them. 
Equality Studies
What are some steps white Americans can take to check their privilege? 
Equality Studies
Who are some prominent obese role models? 
algebra
because the answer I got was 19.541666... 
algebra
m would be in minutes right? 
algebra
The cost of a long distance call is $0.31 for the 1st minute and $0.24 for each additional minute. How long can you talk without spending more than $5? (Write and solve an equation.) 
Algebra
x > – 5 and x < 2 How would I graph this? the greater and less then signs are confusing me 
Algebra
I wonder if there was a typo in the worksheet. Either way, I'm grateful to you for typing this out for me, I think I get the idea now (which is good, another worksheet has more of the same). Thanks Steve! 
Algebra
(3a)x = ?(7x)+3 Right, sorry. I meant to put them in but I'm a bit frazzled. This lot of homework is due tomorrow so I'm kind of everywhere. 
Algebra
I can't recall how to simplify square roots and am stuck on the following problem: (3a)x = ?7x+3 x = 1/4 I am trying to solve for a (since this is part of a group of questions that feed of previous answers, I'm absolutely at a standstill). Thanks in advance for your... 
Math
First student bought art, math and history books for $72. a+m+h=72 Second student bought art, chemistry and history books for $80. a+c+h=80 Third student bought chemistry, math and history books for $61. c+m+h=61 Fourth student bought art, math and chemistry books for $57. a+m... 
Math
55÷11+7x(2+14) 
Social studies
5. What effect on the Columbian exchange does this image illustrate? (A). The population boom of domesticated animals that escaped into the wild. (B). The conversion of the physical environment.*** (C). The introduction of milk cows to the North Americans of the Midwest. (D). ... 
Social studies
2. According to the map, how did people first arrive in North America? (A). They traveled by boat from Africa. (B). They sailed across the Atlantic ocean. (C). They migrated from South America to North America. (D). They walked or paddled from Asia to North America.*** 3. ... 
algebra
Chris can be paid in one of two ways. Plan A is a salary of ?$380 per? month, plus a commission of 9?% of sales. Plan B is a salary of ?$656 per? month, plus a commission of 3?% of sales. For what amount of sales is Chris better off selecting plan? A? 
math
zeros are real number? true or false 
math
the seat of real number is the union of the set of irrational number true or false? 
math
a wire whose length is at most 114cm,is bent to form a rectangle.If the length of the rectangle is 5cm longer than the width, what is the maximum area of the rectangle? 
math
the largest among three positive consecutive odd numbers is greater than the sum of 4 and the product of 3 and the smallest number. Determine the three numbers. z>4+3 is the equation I have made but I do not know what to do next.pls. help me. thank you. 
Chemistry
A saturated solution of NH4Cl was made using 500g of water at 90 degrees. the solution was cooled to 50 degrees. what mass of NH4Cl was crystallized 
Social Studies
it's D 
Macroeconomics(PLEASE HELP)
4. Techniques of Production Resource Resource Prices Land $4 Labor $2 Capital $5 Entrepreneurial Ability $3 Possible ProductionTechniques I II III IV 4 6 8 9 6 7 9 9 5 4 3 2 1 1 1 2 a. Which technique is the most efficient? b. If the most efficient technique is used and ... 
The End of the Cold War
Can someone help me 
The End of the Cold War
1. Which is the best example of how Reagan dealt with the Soviet Union from a position of strength? A. development of the strategic defence initiative B. U.s withdrawl of the salt II treaty from senate approval C. Reagan condemning martial law of Poland D U.S support of the ... 
Math
Ned answers to the Exponets and Divsions test 
Math
1. x^9/X^2 x^11 X^7 7 X^5 
social studies
This is for a Buzzfeed LadyLike video and I have something I need to tell Brah. Its pronounced BRA... 
ChemistryPLEASE HELP!
Is calculating the molar mass part of determing the ions for #1 and then the mol for #3 
Chemistry
I'm not sure how to do these and when I looked it up, maybe there was a diff. vocab used. Please help! 1.) How do you do atom/ion inventory of : Cu3(PO4)2 A. _____ formula units Cu3(PO4)2 B. _____ atoms Cu C. _____ atoms P D. _____ atoms O E. _____ ions Cu2+ F. _____ ions ... 
English
Would "“The chain that bound her here was of iron links..." be a hyperbole? If not, than what literacy device is this? 
Physics
A billiard ball 0.62 kg moving at 8.2 m/a elastically strikes a bowling ball, 3.2 kg moving in opposite direction at 1.2 m/s Calculate final velocities The kinetic energy before the collision The kinetic energy after the collision 
stats.help!
Each year, 64 college basketball teams compete in the NCAA tournament . Sandbox . com recently offered a prize of $10 million to anyone who could correctly pick the winner in each of the tournament games. A. How many games are required to get one championship team from the ... 
Math7/8
ANNIKA HAS A SOCK FILLED WITH 3 RED MARBLES AND 5 GREEN MARBLES. WHAT IS THE PROBABILITY OF HER CHOOSING TWO RED MARBLES WITH AND WITHOUT REPLACEMENT? 
Physics
A ball is shot from the top of a building with an initial velocity of 20 m/s at an angle ? = 39° above the horizontal. If a nearby building is the same height and 55 m away, how far below the top of the building will the ball strike the nearby building? 
Finance
Sheet Metals has an outstanding loan that calls for equal annual payments of $12,600.47 over the life of the loan. The original loan amount was $72,000 at an APR of 8.15 percent. How much of the third loan payment is interest? $5,868.00 $4,725.89 $4,896.48 $5,009.16 $4,687.53 
Finance
I figured it out! 
Finance
You want to purchase a new condominium that costs $287,500. Your plan is to pay 25 percent down in cash and finance the balance over 15 years at 3.75 percent. What will be your monthly mortgage payment including principal and interest? $1,568.07 $1,333.33 $1,708.16 $1,221.43 $... 
American Government
@Writeacher? wth I didn't know you were the boss of this website, and that you limited each student to only two guesses? AHAHAHAHAHAHA 
american goverment check answers
Anon is right once again, thanks b 
Algebra
The arch of the bridge below is half an ellipse, a "semiellipse". The arch is 148m long and has a height of 48m at the center. The height of the arch is 10m at point p. What is the distance from p to the center? 
american goverment check answers
Thx anon! 
Math
the area of a rectangle is given by the expression (x^3+7x^2+11x+2) in^2. The length of the rectangle is given by the expression (x+2) in. What is an expression for the width of the rectangle? 
American Government
CORRECT @answer check 
Chemistry (HELP AGAIN)
You were finding (g) but the question is asking to CALCULATE THE MOLES OF HYDROGEN GAS PRODUCED which I'm really confused about because I don't know how to go about this question now knowing the chemical reaction that occured. I'm sorry but can you find the Moles. ... 
Chemistry(HELP) MathMate
Thank you. Is there any chance that you could write it mathematically from your explanations. I have a hard time trying to decipher the work from standard form to numbers. I really appreciate the explanation though! 
Chemistry
Also, In this experiment hydrogen gas is collected over water and can be referred to as a "wet" gas. Why is "wet" gas as an appropriate term for this? Is it because hydrogen gas is collected over water, which is wet? 
Chemistry! Help
I don't understand how you would calculate the moles with a chemical equation given the 7.00 g of Magnesium. 
Chemistry
A.) Write a balanced chemical Eq'n for a reaction between MAGNESIUM & HYDROCHLORIC ACID. Answer: Magnesium + Hydrochloric Acid Mg (s) + 2 HCL (ag)  MgCl2 (aq) H2(g) B.) Assuming 7.00 g of Magnesium completely react according to the above Eq'N, calculate the MOLES ... 
algebra
Elimination method or substitution method. 1. 3/5x = 1/2y + 11 2. 3x + 8y + 13 
Science
Each heating element has a resistance of 5 ?. The current passing through each element is 0.4. Calculate the total resistance of the six heating elements. 
math
A restaurant offers seven different main courses,,eight types of drinks and four kind of desserts. How many different meal consisting of main course,a drink and a dessert does the restaurant offer? 
Math
When calculating area, you always multiply. Area= Length X Width. 
Math
Many times, the author of an assignment will include common mistakes as answer choices. You then need to check your answer by making sure it makes sense. If she buys more than twice as much as she did the first time, will the answer be greater than or less than the amount she ... 
Math
Since the problem says "2 1/2 times" you are going to multiply. If you are getting the same answer dividing, you are dividing incorrectly. My guess is that you are not flipping the second fraction before multiplying when you are dividing (to divide fractions, you ... 
Math
If your teacher wants to keep it in fractions... Convert 21 7/8 into an improper faction of 175/8 and 2 1/2 into 5/2. Multiply together and reduce/ convert to mixed fraction of 54 11/16. 
8th Grade Journalism
1. Suggest The principal received the exam results and announced over half of the students who took the exam failed the exam. 2. The administration recently conducted talks to determine... 3. A faulty ladder killed a construction worker last week... Basically try to make the... 
chemistry
The actual question is: A sample is analyzed to determine its iron content (as Fe2+0 via a redox titration with potassium chromate as the titrant. In the titration Fe2+ is oxidized to Fe3+ and CrO4(2) is reduced to Cr3+. What is the percent by mass of iron in the sample if 0.... 
chemistry
Fe2+ is oxidized to Fe3+ and CrO4is reduced to Cr3+ using an unknown sample containing Fe2+ and 0.04322M K2CrO4 solution in a redox titration. I first need to balance the formula, but I don't know what to do with the potassium. 
Math
I got 6 when solving for M but i dont know how to explain 
Math
Im sorry Im new to this how do I solve for M 30+25M = 30020M 
Math
Two hot air balloons are in flight above a field. The first Balloon is 30 meters above the ground rising 25 meters per minute. The Second Balloon is 300 meters above the ground descending 20 meters per minute. When will the 2 balloons be at the same altitude? What would be the... 
anatomy
True 
math 9
Given Parallelogram ABCD with AB=(3x5)cm, BC=(2y7)cm, Cd=(x+7)cm, AD=(y+3)cm 
Chemistry
How many electrons in an atom could have these sets of quantum numbers? n=2 n=5, l=3 n=6, l=1, ml=1 
chemistry
the word "proof" on alcoholic beverages is defined as twice the percentage by volume. How many ml of alcohol are in a oneliter bottle of 80proof gin?