# chemistry! URGENT

60,827 results, page 11

### AP Environmental Science (URGENT)

Strontium-90 is a radioactive waste product from nuclear reactors. It has a half-life of 29 years. How many years will it take for a quantity of strontium-90 to decay to 1/16 (one-sixteenth) of its original mass?

### Physics URGENT!!!

Two boxes of fruit on a frictionless horizontal surface are connected by a light string as in the figures below, where m1 = 15 kg and m2 = 17 kg. A force of 58 N is applied to the 17 kg box. (a1) Determine the acceleration of the boxes (b) the tension of the string (c)

### Physics URGENT!!!

Two boxes of fruit on a frictionless horizontal surface are connected by a light string as in the figures below, where m1 = 15 kg and m2 = 17 kg. A force of 58 N is applied to the 17 kg box. The acceleration of the boxes is 1.8. Find the tension in the string.

### math VERY URGENT

Mrs. Black has one begonia plant. If she buys two begonia plants each year for every one she has, how many will she have in four years? Please explain the answer.

### maths-urgent

a man has 3 unique coins such that the probability of obtaining a head when the coin is flipped is 1 10 , 2 10 and 3 10 , respectively. If he flips each of the 3 coins once, the probability that at least 1 heads appears is p . What is the value of 1000 p ?

### physics

a rod is having a positive charge and a point charge is placed at a distance 'd' from it making angle 45 degree with one end and 37 degree with the other.calculate field. plz answer its urgent.

### Math Urgent

A rectangle of length 4cm and width 3cm has one vertex at the origin of a system of axes and another vertex on a quarter of a circle whose center is also at the origin. Solve for the area

### Urgent math

Which of following is divisible by 4 for all natural numbers n? (Select all that apply.) please help ?!?!? 5n + 1 − 9 6n − 2 7n + 1 3n + 1 10n − 2

### Urgent math

Which of following is divisible by 4 for all natural numbers n? (Select all that apply.) please help ?!?!? 5n + 1 − 9 6n − 2 7n + 1 3n + 1 10n − 2

### math

A cubical water tank has each edge 5m long. Find the volume of water in the tank if 1/5th of the tank is empty. Pls help... Urgent***

### 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???

### alg 2+urgent please.

2/the 6th root of 81 the answer gave an answer of "2 3rd root of 3/3" sorry i didn't type the root signs, i dunno how. can you show me how to work this?

### Social Studies Urgent

under a socialist government, who make the decisions? can citizens take part in the decisions? or the government makes all the decisions please help and thank you

### Calculus (Urgent!!)

Hello everyone, I need help with the following problems. Find the partial derivative of the following: 1) f(X1, X2) = X1^1/2*X2^3/4 2) f(x1,x2,x3) = ln(x1)x2 + 3x3 3) f(x,y) = 3x + 4y 4) f(x,y) = x^1/2 +x/y + y/x Find the maximum of the following function: 1) f(x1,x2) = 5x1 - ...

### Physics URGENT! PLEASE

An object in equilibrium has three forces exerted on it. A 36 N force acts at 90° from the x axis and a 42 N force acts at 60°. What are the magnitude and direction of the third force?

### linear algebra-urgent

1)let w=[3;4] and u=[1;2] a) find the projection p of u onto w. I found this to be p=[1.32;1.76] b) find a scalar k for which the vector kp has a norm that is equal to one. k=? d)find a vector that is orthogonal to span{w} s=? how do I do this

### Legal Studies

Hi beautiful people! I need help finding statistics on the rates of incarciration/fines or other punishments for person convicted of victimless crime in Australia. Preferably Queensland. This is urgent, I simply cannot find the information and I would REALLY appreciate your ...

### Chemistry VERY URGENT PLEASE

A) NaOH(s) > NaOH(aq) B) NaOH(s) + HCl(aq) > NaCl(aq) + H2O(l) C) NaOH(aq) + HCl(aq) > NaCl(aq) + H2O(l) Examine the 3 reaction equations, and determine the relationship between them. Demonstrate this relationship by combining the equations in a manner consistent with...

### Calculus Help Please Urgent!!!

Prove that the integral on the interval [a,b] of x is equal (b^2-a^2)/2 integral a to be (x)dx = (b^2-a^2)/2 using the definition of a Definite Integral. This is the limit of a sum approach. show steps please!!! Thank you!!!

### regents

I have to take the Regents exam, but there are a great number of math regents exams. If I am in 11th grade,which one should I take??plz help , this is urgent! !😣

### Quick Help (URGENT)

1. What percentage of teen parents live in poverty? Is it 75 percent?? 2. How can you get HIV? Unprotected sex, anal, oral, vaginal. 3. What are the other methods of transmission of HIV? ??? Can someone check over my answers and help me with number 3? Thanks very much.

### English

Writeacher, I'm still working on my paragraph on the presentation of the Irish school. I really hope you'll be there in three hours' time to check if everything is OK. By the way, can you suggest a website, on which (?) phrasal verbs are grouped according to their topics? It's...

### math (urgent!)

I was given a graph and told to find an equation for the temperature T in terms of the time t in the form T(t) = a sin(kt-c)+d where a, k, c and d are constants. The max was 32.9 and the min 21.1 I determined that amplitude = 5.9 vertical = 27 period = pi/12 The last thing I ...

### Urgent 8th Grade Language Arts

How is the word street used in the sentence below: Street cleaners can often be seen on our block in the very early morning. adjective*** adverb noun pronoun Am I right Ms.Sue?

### French Cuisine (URGENT)

Quick question. French cuisine before and after the French Revolution and why did it change. Please help. Thank you.

### urgent math

in a GIVEN DAY THE MILL TURNS OUT THREE TIMES AS MANY UNITS OF PLYWOOD. IT PROFITS OF $25 ON A UNIT OF LUMBER AND $40 ON A UNIT OF PLYWOOD. HOW MANY OF EACH M UST SELL TO MAKE PROFIT OF $14720 can anyone help im so confused

### Math please help urgent!!

2. If m<1=43, what is m <4? 53 43****** 37 27 3. If m <1=43, what is m <5? 50**** 40 35 25 <=the angle sign Unfortunately i can not link the graph. But it is horizontal and a vertical crossing line then a diagonal line drawn through each right angle mke by the ...

### urgent chem help ( dr bob plz)

A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.55? ------------------------- i am gettig 5.3 x 10^-10 is that rite or worng pzl conform ..

### Physics urgent

A rubber puck, initially travelling at 39 km/h, is sliding along an icy surface. How long (in seconds) would it take the puck to come to a complete stop if the coefficient of kinetic friction between the puck and the ice is 0.2?

### Science

What would the application be to my experiment which was "We dig through soil and check for inorganic and organic matter in the soil and look for natural things in the soil(ex; beans,feather,rocks,sticks,and grass)" Please I need your help URGENT! ! !

### physiology practical

what affect can happen on the blood pressure and the heart rate when you drag or clamp the common carotid artery of the rabbit? and why? PLEASE please answer fast cause i have presentation tomorrow, please need help urgent!

### Algebra 2 URGENT

Simplify: 4s raised to the negative 2 power - (4t)raised to the -2 power

### Math, URGENT!

What is the decimal equivalent of 1,932% and how do you get the answer to the decimal equivalent?

### math-urgent

show that if A= A inverse, then det(A) = +/- 1 if A(transpose) = A(inverse), what is det(A)?

### Science Urgent

i know i post this question before but i really need help on this question which have a higher value, iron-containing minerals or feldspars? Why? please help this is my last question i need to answer

### maths

Two pole of heights 6m and 11m stand on a plane ground. If the distance between their feet is 12m, determine the distance the distance between their poles. Please help me its urgent

### Precalculus(URGENT)

write the parabola in y squared=4ax or x squared =4ax form where x equals the distance between the foci and the centerpoint y= -(x+3)squared +4 i have no idea how to do this can you tell me how you got the solution

### Honors Biology - URGENT!!!

ATP is used to power the movement of your muscles as you turn the pages of a book. Where did the energy in the ATP come from? Trace the energy in the ATP molecule back to the sun.

### 8th grade math HELP URGENT!!!

Solve Each equation by first dividing each side of the equation by the number outside the parentheses. When would you recommend using this method to solve an equation? Explain. A. 9(x-4)=72. B. 8(x+5)=60

### history urgent please!

The most dominant merchant and traders of the Indian Ocean Trade network were Chinese merchants Muslim and Arab merchants African merchants Australian and Oceania merchants European Merchants

### Math URGENT!

the roots of a tree are 1/8 of the tree. they are 0.87 m. how tall is the tree? my answer: 0.87 x 7 = 6.09 m please check if my answer is right thanks :)

### MATHS HELP URGENT.pleasee

The area of a triangle ABC is 126 sq.cm. AC=13 cm , BC = 21 cm, what is the length of AB? where, triangle ABC is a scalene triangle

### Math Urgent Please Help

Which coordinates could be the vertices of a triangle similar to triangle RST? {original triangle coordinates R(0,0); S(0,4); T(3,0)} a. (2,2), (2,6), and (6,0)*** b. (0,0), (0,6), and (10,0) c. (2,2), (2,10), and (6,2) d. (0,0), (0,8), and (6,0)

### Bio(its urgent!)

according to cell theory, the cell is the basic unit of structure and function in the body. in two or more sentences, explain how this fact relates to the need for digestion. please i help! i have searched the sites but cannot find a answer...... plz help!

### math(please help urgent)

1) Find the values (if possible) of the six trigonometric functions of o if the terminal side of o lies on the given line in the specified quadrant. y=1/3x 2)Evaluate (if possible)the sine, cosine, and tangent of the angles without a calculator. (a) 10pie/3 (b) 17pie/3

### English

I forgot the last two sentences. They are urgent!! 1)Can you write your name and e-mail on this sheet of paper so that we can get in touch with you (each other?) when you are back in America? 2) I would be pleased if our students could start sending e-mails to one another so ...

### History

Hi I'm evaluationg sources and I need help finding out more informatoin on Z.A.B Zeman. IN the book, he said something about being a marxist/socialist/communist but i'm not sure what and its kinda urgent that I find out... I've been working real hard.

### Literature- Urgent!!

Can anyone help me find a hyperbole in the book the lord of the flies, please? I've been trying to find one for the past two months! And now, school is about to start. The quotation, page number and a brief summary would be appreciated!!

### chem urgent!!

What is the pH of the solution created by combining 12.00 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? i need to find the ph with HCL and then with hc2h3o2. i got 1.30 as my anser but this was wrong i multipled all these...

### Physics(urgent)

A ball is thrown horizontally from the roof of a building 58.5 m tall and lands 38.7 m from the base. What was the ball's initial speed in m/s? Hint: Find the horizontal velocity by calculating the time of flight and using the horizontal distance.

### URGENT Chemisrtry

In an atom whose core contains 16 neutrons possess a total electrical charge q=+2,56x10in force -18 1. What is the atomic number of the atom? 2.What is the number of nucleons(mass)? 3.How much electrons has in electronic mantle?

### MATH URGENT!

Madison is standing on the roof of a building that is 350 feet above the floor. She throws a ball straight up with a velocity of 20 feet per second. How long will the ball be in the air before it hits the ground?

### bio

Would you agree that it is valuable for a nation to have a citizenry that is reasonably well versed in science? Give reasons for your answer. Would you say this need has become especially urgent in the last two decades? Why or why not? Evaluate Answer

### Math, HELP!! URGENT!

Please Simplify: (1/8)(40v−24y)−(1/7)(21v−35y+9)−(1/6) (1/11)(55x−22)−(1/2)(18x−2v)

### accounting..help plz urgent!

An accounting report that shows the changes in capital during the accounting period is: a.) a balance sheet. b.) an income statement. c.) a statement of owner's equity. d.) All of these answers are correct.

### Economics

Present value equivalent for geometrically increasing series when the first year base of 4,000 increasing at 4% per year to year 15 at an interest rate 17% compounded continuously? urgent Help please

### Math (urgent)

the equation x^2+y^=25 describes a circle with center at the origin and radius 5. The line y=x-1 passes through the circle. Using the substitution method, find the points at which the circle and line intersect. a) (4,3) and (-4,-3) b) (3,4) and (-3,-4) c) (4,-3) and (-3,4) d) ...

### VERY URGENT MATH!!!

1. 3w – 10w (1 point) 13w –7w –7 7w 2. y + 2y +3z (1 point) 2y + 3z 3y + 3z 2y2 + 3z 6yz 3. 6r + r – 5r (1 point) 2r 1r + r 0r 7r – 5r 4. 5x + 2(x + 6) (1 point) 7x + 6 7x2 + 12 7x + 12 7x (x + 6) 5. –3m + 3(m + 6) (1 point) 6 –6m + 6 6m + 18 18 MY ANSWERS: 1)B 2...

### GR.10 CIVICS! LAST TIME PLEASE HELP

can someone please give me a direct link to a picture that protrays or is related to the inuit being allowed to vote in canada in 1950. actualli the picture can have any type of aboriginal groups. thanks ...URGENT

### Calculus Help Please!!! Urgent!!!

If x^3 - y^3 =3 , use only implicit diff. to find d^2y/dx^2 . Express your answer in terms of x and y only and write is as a proper fraction that is completely simplified as much as possible. d^2y/dx^2= -6x/y^5 (this is the answer I should get but i don't know how to show ...

### History, Urgent

How did the Louisiana Purchase set a precedent for the powers held by the President of the United States? If someone could copy & paste, I cannot follow links... and I need to know this. I have a test tomorrow, and i need to study. This is my last question to study for. Thank ...

### Math-Urgent help please.

Two cards are selected, without replacing the first card, from a standard deck. Find the probability of selecting an ace (A), and then selecting a 4 (B): (choose 2) 0.603% 0.592 0.592% They are dependent events. 0.00592

### Math

URGENT! an artist intends to paint a 60-square-foot mural on a large wall that is 18 ft wide and 11 ft tall. find the dimensions of the mural if the artist leaves a border of uniform width around it. Pls show me how'd you get your answer

### science urgent

how does Nacl use electrons to make a bond. (ionic compound) how does water use electons to make a bond (covalent compund)

### Interview/Questions (URGENT)

Okay, I have to interview my partner for this assignment. What would be 10 good questions that I could ask him? What would you want to know about a person? Thank you very much for your assistance.

### its urgent math i need the answer fast

Price: 5.49 Unit Rate: 0.04 Price: 1.50 Unit Rate: 0.02 how much would you save in one year?

### math(urgent)

A radio set costing $500 was marked up 20% based on retail price. later it was marked down by 10%. WHAT is the final retail price?

### Algebra (urgent!)

A line has the equation x = my + b for some real nonzero constants m and b. a. In terms of m and/or b, what is the x-intercept of this line? b. In terms of m and/pr b, what is the slope of this line? I have no idea how to solve this, so please walk me through to the answer. ...

### Physics URGENT

I did a lab on DC circuits, and we calculated the resistance of multiple resistors in parallel. Resistance of Resistor 1 & 2 = 1000 +/- 5% so R1 =1000+/- 50 R2= 1000 +/1 50 i need to calculate R using the equation... R= 1/R1 + 1/R2 I am confused as to what the uncertainty ...

### Math Urgent

(k+3)^2=(2k-1)^2=0 Please help me solve this equation or maybe one like it......I keep doing it wrong. 6p^2(p+1)=4(p+1)-5p(p+1) I also keep doing this problem wrong. I have the answer but I don't understand how its done. Please help!!

### geometry

please help find answer. very urgent. triangle PQR is a 30-60-90 triangle with right angle Q and segment PQ as the longest. Find the possible coordinates of R if (2,6) and Q (2,-6). please help

### Math(Urgent Please help)

Find the area of the parallelogram that has the vectors as adjacent sides. u = i + 2j + 2k V = i + k I know that the magnitude of the cross product results on the area. After I do the cross product then what to I do?

### math question 4- very urgent !

Find the average value of f(x) = x^3 + 3 for 0 ≤ x ≤ 2 and find all values of x* described in the Mean Value Theorem for Integrals.

### URGENT!! 7th Grade Math Help Please!!

2. Price of the iPad Mini: $329.00 Price of the iPad with a 15% discount. Show all of your work please!! [4 points]

### URGENT-economics

How do you find the equilibrium price & level of output give Demand Data: P & Quantity Demanded Cost Data: Output & Total cost

### Physics URGENT

5uC charges are at the base vertices of an equilateral triangle 0.4m on a side. What is the electric field at the third vertice? im not completely sure how to start that.. don't i need the force to calculate the x&y components? NO. Figure E directly from a charge. ...

### Math (URGENT)

Use calculator - answer correct to 3 places. a. 3sqrt17 + 2sqrt15 / 5sqrt7 = 10.644 b. 2sqrt11 - 3sqrt2 + 15sqrt10 + 5sqrt5 = 61.005 c. 4.3sqrt6.9 / 1.7sqrt57 = 50.163 Can someone check my answers? I keep getting the feeling these are not the right answers. Thank you.

### speech

You are concerned about the high rate of school droupouts in your community and have recentky addressed the youth at a local secondary school who were thinking of dropping out of school and look for job.please help me its urgent the task is needed tomorrow

### WAVE CALCULATION QUESTION URGENT!!!!!!!!

Convert 8.6 x 10^13 Hz to nanometers. Assuming this is a light wave, Frequency*wavelength= speed oflight jiko like question jiko know all. ;.)

### Geometry(Very Urgent!!!)

Triangle NQP is an equilateral triangle with the measure of angle N=5x-2y and the measure of angle P=x+2y. Find the values of x and y. Show all work to receive credit.

### Calculus (Urgent Help)

The graph of y=cos x * ln cos^2x has seven horizontal tangent lines on the interval [0,2pi]. Find the x-coordinate of all points at which these tangent lines occur.

### Calculus (Urgent Help)

The graph of y=cos x * ln cos^2x has seven horizontal tangent lines on the interval [0,2pi]. Find the x-coordinate of all points at which these tangent lines occur.

### Chem please help urgent

why is the formation of a condensation polymer impossible in these cases ? A) ethanoic acid + NH2CH2CH2CH2CH2NH2 B) ethanoic acid+CH3CH2NH2 C) HOOC-CH2-COOH + CH3CH2NH2

### English II(urgent)

to a person who can delete posts....can you please delete my essay assignment that I posted yesterday? it is under one of my "English III" posts. I don't want it on the site anymore ya know? THANK YOU

### URGENT- need help about stage diagrams

When I do my diagram of the stage, should I do it based on the audience's right and left or the actors' right and left?

### Biology (pics) (urgent)

I need help finding a picture/diagram of "External Fertilization" and a picture/diagram of "Internal Fertilization" thank you very much!!

### Science

can some one tell does composites produce a sulfuric acid when it erupts or does any volcanoes produce sulfuric acid please help urgent

### Chemistry - bobpursley pls help

Posted by candy on Tuesday, September 21, 2010 at 3:12pm. Yes, my NaOH is granular. Why 7ml of 10M HCl? Do I add 7ml of 10M HCl 1st slowly in ice bath, then slowly adjust the pH to 7 using 10M HCl? Then to dilute to 15ml in a graduated cylinder? Thanks Posted by candy on ...

### cooking URGENT

i need to know if there is a substitute for sour cream i need to make banana bread, but most of the recipes ask for sour cream, which i don't have on hand right now. pleease help!

### Maths Calculus Derivative Integral - Urgent Please

Use 2nd Fundamental Theorem of Calculus to find derivative of f(x) = integral of 2x^2 (at the top) to x-5 (at the bottom) of square root of Sin(x)dx

### geology (urgent)

i am having trouble finding how a shield volcano erupts and how a cinder cone volcano erupts. dont they all erupt the same? i gues they dont please help and thank you

### maths-urgent

divide 44degree8minutes into two parts such that the number of sexagesimal seconds in one part may be equal to the number of centesimal seconds in the other part?

### URGENT physics

M1 is a spherical mass (38.6 kg) at the origin. M2 is also a spherical mass (10.3 kg) and is located on the x-axis at x = 59.8 m. At what value of x would a third mass with a 20.0 kg mass experience no net gravitational force due to M1 and M2?

### Science Help Urgent!!!!!

A particular neutral uranium atom has 92 protons, 143 neutrons, and an atomic mass of 235. How many electons does the atom have? a. 92 b. 143 c. 235 d. 337 Is the answer A?

### Urgent Math

Solve it step by step! Find the area below f(x) =-x^2 + 4x +3 and above g(x) = -x^3 +7x^2-10x + 5 over the interval of [1 ≤ x ≤ 2]. Show the overlap or shaded area of the graph.

### Chem URGENT!

What is the translating word equations for this question: Nickel reacts with lead nitrate to produce nickel nitrate and lead.

### math URGENT!!

the midpoints of the sides of a triangle are (1,1),(4,3),and (3,5). find the area of the triangle. please answer and show how u did it step by step please!!!!

### business/math

what is the answer to: you obtain a margin loan of 18000 to puchase some stock. the effective intrest rate on the loan is 7.8%.how much intrest will you pay if you repay the loan in 3 month. urgent respone needed

### Social Studies URGENT

1. Why was the bison hunt so important to the Metis? Because the bison provided food for the Metis and clothes were made from the hides. 2. Activities/Lifestyle of Metis? ??? Can someone please check #1 and assist me with #2. Help is greatly appreciated. Thank you.