# chemistry... HELPP

57,245 results

**urgent alg 1**

add or subtract 2 2 (2t -8t)+ (8t + 9t) second question 3 2 3 (t +8t ) + (-3t ) please helpp its urgent i have the answer butt im not suree pleasee helpp

**chemistry... HELPP**

What is the cell potential for the reaction Mg(s) + Fe^2+(aq) -----> Mg^2+(aq) + Fe (s) at 63 degrees celsius when [Fe^2+]= 3.30 M and [Mg^2+]= 0.110 M

**chemistry... HELPP**

Place charges and electron dots as needed on each ion. As Se Br K Ca Ga. I answered: As3+ Se2- Br- K+ Ca2+ Ga2+ but i got it wrong so please helppp!!!

**Science chemistry**

It takes 1 hour and 17 min. for a 1.000gsample of a certain isotope to decay to 0.121g. What is the half-life of this isotope? plssss helpp

**chemistry**

It takes 1 hour and 17 min. for a 1.000g sample of a certain isotope to decay to 0.121g. What is the half-life of this isotope? plssss helpp

**CHEMISTRY HELPP!!!!**

which of the following is not highly ionic? BeO, BaO, CaO, SrO, MgO BeO has the least ionic character of those listed.

**chemistry... HELPP**

Chemistry Equilibrium Constant PLEASE Help!? In an experiment, equal volumes of 0.00150 M FeCl3 and 0.00150 M NaSCN were mixed together and reacted according to the equation: Fe3+ (aq) + SCN– (aq) <--> Fe(SCN)2+ (aq) The equilibrium concentration of FeSCN 2+(aq) was 2....

**chemistry**

The concentration of NaOH in a solution is 7.00 10-6 M. What is the [H3O+] in the solution? _______________M What is the [OH-] in the solution? __________M What is the pH of the solution? What is the pOH of the solution? HELPP?? i don't understand any of this...

**Chemistry- helpp!**

The equation for synthesis of the poisonous gas COCl2 is CO(g) + Cl2(g)COCl2 If 43.2 kJ of energy is evolved when 39.5 g of COCl2 is synthesized, what is the molar enthalpy for this synthesis? THANK YOU!

**physics need urgent helpp**

i have tried everything, please helpp A snowmobile, with a mass of 530 kg, applied a force of 410 N backwards on the snow. What force is responsible for the snowmobile’s resulting forward motion? (Hint: Think action–reaction force pairs.) If the force of friction on the ...

**math helpp please!!!**

2Y-1 p-1 ----- - ---- 2y+5 p+3

**algebra pleassee helpp**

(a+6/2) - 1/4= (2a-2)/3

**chemistry**

The reversible reaction n2(g) + 3h2(g)<-> produces ammonia, which is a fertilizer. At quilibrium, a 1-L flask contains 0.15 mol H2, 0.25 mol N2, and 0.10 mol NH3. Calculate K eq for a reverse reaction? Please HELPP!

**math**

definition of area ??? helpp :/

**Chemistry**

An unknown salt AS x XH2O was analyzed and found to contain 16.4 percent water. If the anhydrous salt has a formula mass of 183 amu, find the water of crystallization (X) for the hydrate. I have no idea how to figure this out! HELPP PLEASE!!

**chemistry... HELPP**

Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows: C5H5N + H2O<-->C5H5NH+ + OH- The pKb of pyridine is 8.75. What is the pH of a 0.190 M solution of ...

**math!**

how do you do lcm i know i did it in like 1st grade but i need helpp!!

**algebra**

evaluate the expression n + (-5) for each value of n. n=312 i don't know how to do this..please helpp..

**math again helpp**

0.6x + 0.8 = 1.4 Explain each step and identify the property

**chemistry... HELPP**

A gaseous reaction occurs at a constant pressure of 45.0 atm and releases 62.5 Kj of heat. Before the reaction, the volume of the system was 8.60 L . After the reaction, the volume of the system was 3.00 L. Calculate the total internal energy change in kilojoules.

**9th grade**

find the unit rate 3 tablespoons for 1.5 serving how do u do it??? helpp thanks

**geo HELP!!**

what are examples of formal economic activities? helpp plz and thanku :)

**Algebra2**

Helpp? Graphs of functions !! I need to determine if these are odd or even? 1. f(x)=x^5-x 2. f(x)=5 3.f(x)=x^4+2x^3

**simple easy math question PLEASEEE HELPP!!!**

is this true? log^2 x = (logx)^2

**Ms Sue please helpp**

Find a fraction equivalent to the recurring decimal 0.435643564356....

**Biology**

Sponge bob notices that his pal Gary is suffering form slimotosis , which occurs when the shell develops a nasty slime and gives off a horrible odor. His friend Patrick tells him that rubbing seaweed on the shell is the perfect cure, while Sandy says that drinking Dr.Kelp will...

**Math**

Find all x, -4pi < x < 6pi, such that [cos(x/3)]^4 + [sin(x/3)]^4 = 1 PLEASEEE HELPP! :(

**Literature**

I still havn't figured out where the exposition of The Miracle Worker is. Please helpp! Thanks -MC

**--->CHEMISTRY<--- HELPP**

(a)107.868 - (2.113e02) + (5.623e03) Calculator Result: 5519.568 Correct Result:________ * The correct result would be in .001, right? If yes, shouldn't it just be 5519.568??

**pre-algebra-math**

two fractions equivalent to the given factor 18/21 and the other 3/27:) please helpp

**SCIENCE. I NEED HELPP**

How do trees change the environment, making it less favorable for grass to grow?

**Pre-Calc/Trig**

Helpp please State the domain and range of each of the following functions: 1. f(x)=1/(x+3) 2. g(x)=√x+6 3. h(x)=x^3+2x+5

**trig. identities**

sin2x+sin2y=2sin(x+y)cos(x-y) Please helpp mee!! thank you sooo much really!!

**MATH Is there no one who can helpp???????**

how do i simplify -9/2x^-3/2??? please help i dun need a answer necessary just an explanation is fine :)

**science**

the making of polymers is an example of the category of work done by chemists calledd ________ fill in the answerr. please helpp!

**Science**

Cannabis tricks nerves in the brain into sending distorted messages. Which of the drugs effects on the body could this explain??? Helpp!

**MATH**

HELP? Exam in 20 mins -dont' have any idea how to do this question; please helpp.. anyone! PLEAZE A.S.A.P. minimize p= 15x +18y subject to x+2y<=20 3x + 2y>= 36 x>=0 y>=0

**I HAVE A MATH TEST TOMORROW HELPPP PLEASE!**

im not sure how to find the first four terms of each arithmetic sequence tn=4+(n-1)(3) helpp me pleasee!

**I HAVE A MATH TEST TOMORROW HELPPP PLEASE!**

im not sure how to find the first four terms of each arithmetic sequence tn=4+(n-1)(3) helpp me pleasee!

**algebra**

Find the x-intercept and the y-intercept of the graph of: 4x-2y=8 a. (2, -4) b. -4;2 c. (4, -2) d. 2;-4 I'm stuck between a and d. anyone helpp?

**algebra 2**

Find the x-intercept and the y-intercept of the graph of: 4x-2y=8 a. (2, -4) b. -4;2 c. (4, -2) d. 2;-4 I'm stuck between a and d. anyone helpp?

**Sciencee**

Whoopss! Okayy, So does a change in direction change acceleration? I think it does, But i'm not suree. Helpp! :))

**Algebra helpp i am going to fail**

The length of a side of a square is 3x+2 . What is the area of this square in terms of x ?

**Stupid Algebra**

13a squared times b(-4a cubed b cubed c) and no, I am not making this up. PLEASE HELPP POOPOO

**math log PLEAseee helpp pretty please!!!**

determine the point of intersection y=logbase 10(x-2) and y=1-logbase 10(x+1)

**Math**

Math - Tyler, Wednesday, May 14, 2014 at 2:51pm Solve (z +2)^ 4/3 = 4 where z is a real number please helpp

**vocabulary**

i need to put 20 vocabulary words in a story helpp!!

**math**

37 is what percent of 144, to the nearest percent? please helpp

**urgenttttttttttttttttt please helpp??**

how did the involvement of the u.s in the politics of southeast asia,korea, and vietnam impact the u.s political climate of the 1950's? any help is appriciated history is my worst subject

**sara**

which of the following is an example of capital? A. money in a Swiss bank account. B. a bulldozer C. a CD by Metallica D. a Dracula costume for Halloween not sure which one to choose? helpp

**math,,,,helpp**

describe strategies you have found for deciding whether a fraction is between 0 ans 1/2 or between 1/2 and 1???????????????????

**Chemistry**

Calculate the percent yield of iron if 950 g of Fe3O4 underwent the reaction shown in the chemical equation below and 533 g of Fe was isolated from the reaction mixture. Fe3O4 (s) + 2 C(s) ----> 2 CO2 (g) + 3 Fe(s) 1). 25.9% 2). 77.5% 3). 56.1% 4). None of the above. Based ...

**physics please helpp**

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·108 N/m2

**Probability Please helpp**

For each integer n ≥ 4, let an denote the base-n number 0:133n. The product a4a5 : : : a99 can be expressed as m/n! where m and n are positive integers and n is as small as possible. What is the value of m?

**Probability Pþease helpp**

Select numbers a and b between 0 and 1 independently and at random, and let c be their sum. Let A, B, and C be the results when a, b, and c, respectively, are rounded to the nearest integer. What is the probability that A + B = C?

**social studies**

Between 1850 and 1950 the productivity of the average American farm worker: A. declined B. remained about the same C. doubled D. quadrupled I'm unsure which choice to choose? helpp

**calculus**

limit as x approaches 2 where f(x)=5x-5 Find a δ such that | f (x) - 5 | < 0.01 if | x - 2 | < δ. (Give your answer correct to 4 decimal places.) Need helpp!!! I have no idea how to do it. and nobody that can help!!

**Physics helpp**

Newtons 2nd law The force of earths gravity is about 10 N downward. Whats the acceleration of a 15kg backpack if lifted with a 15N force??

**english**

In the memoirs, “Barrio Boy” and “No Gumption”, how are these two memoirs similar? How are they different? In what ways are the authors’ choices and depictions related to the subject matter of their stories? pleeeaaaasssseee helpp.

**MATH HELPP!!**

FRANCIS PACKED A BAG FOR HER VACATION.SHE TOOK 4 T SHIRTS,2 SWEATERS, 3 PAIRS OF JEANS, HOW MANY COMBINATIONS OF 3 COULD SHE MAKE USING EACH ITEM ONCE.MAKE A TREE DIAGRAM ---->>> THNX!!

**calculus--please helpp**

if the line 3x-4y=0 is tangent in the first quadrant to the curve y=x^3+k, find k. all i know is that its related to finding a derivative and i m basically completely lost....can please someone provide me some help?????

**Help!!!**

Caring,Responsibility,Effort, Respect,Honesty,and Choices..............What are they? Please Helpp!!!!!!!!!!! Could it be character traits? Political slogans? Abstract nouns? =) Words we can expect to be bombarded with every day from now until Nov 7th??

**U.S.History**

In the Declaration of Independence what reference is there to Native Americans? What attitude toward Native Americans does this express? pleease helpp!!!

**Math**

For math, I have to find the area of a hexagon when all I know is that each side equals x. I also know that I have to use 3 thereoms. HELPP!

**math~ helpp pplease**

(3,5) is a point on the graph of y = f(x). Find the corresponding point on the graph of each of the following relations a) y=3f(-x + 1) + 2 what do I do with the negative sign before the x (-x)?

**physics PLEASE helpp**

Find the net change in entropy when 213 g of water at 0.0°C is added to 213 g of water at 96.9°C.

**math helpp**

8. Convert the scale to a unit rate. Show your work. Interpret the meaning of the unit rate.

**Math**

Find sec θ and csc θ. If tan θ =3 and cos θ>0. Please helpp, i don't get identities

**please help!**

How do you believe computer mediated communications may affect the future of human communications? PLEASE HELPP !!!!

**please help!**

How do you believe computer mediated communications may affect the future of human communications? PLEASE HELPP !!!!

**maths**

Helpp mee!!! I'm really stuck so I need help. Teresa has three times as much money as Rita. Between them they have €10. How much has Teresa?

**maths**

Helpp mee!!! I'm really stuck so I need help. Teresa has three times as much money as Rita. Between them they have €10. How much has Teresa?

**social studies 9**

make five observations about life in the backwoods of upper Canada. what jobs did pioneers do for themselves that we would never think of doing for ourselves today? PLLEZZZ HELPP CAN YOU ANSWER IT I DON'T NO WAT TO WRITE FOR THIS QUESTION

**math helpp**

kathy will babysit six cats. she charges $75 for the week for supplies and $8 for each hour,h,she works. write an expression for the total amount kathy charges. -->> THNX!!!

**ALGEBRA...[HELPP!!]**

Arianna kicks a soccer ball off the ground and in the air with an initial velocity of 42 feet per second. Approximately what maximum height does the soccer ball reach?

**Debating**

i reallyy need helpp and sites with information on this question and im on the negtive side so im finding it pretty hard to find information on the question. Modern media is more manipulative than informative? plesee can anyone help.

**HELPP !!**

Copper(I) ions in aqueous solution react with NH3 according to Cu^+ + 2NH3 --> Cu(NH3)2^+ Kf=6.3x10^10 Calculate the solubility (in g/L) of CuBr (Ksp=6.3x10^-9) in 0.81 M NH3.

**physics please helpp**

A 1.67-kg block of aluminum at 21.7°C is to be melted and reshaped. How much heat must flow into the block in order to melt it? use the following values: For copper: c_copper=0.386 kJ/kg.K T_fusion=1359 K L_fusion=205 kg/K

**PreCalculus**

Write an equation to construct a function whose graph is like that of y=x^2, except for pieces removed for values between 3 and 5, and 8 and 9. I am not sure how to approach this question. Would I make a piece wise function? PLease helpp brains about to explode!

**social studies**

what did freedom to former slaves and how did their lives change in the aftermath of the civil war? also could the federal government have done more to helpp southern africa americans after the civil war? please explain

**physics**

A car starts from rest and reaches a velocity of 8 m/s in 4 seconds. a) What is its acceleration? b)If its acceleration remains the same, what will be its velocity in 15 seconds? plsss helpp meeeeeeeeeeeeeeeeeeeeeee

**Math HELPP!!!!**

as a part of a geometry assignment john drew an equilateral triangle. which of the following dimensions could reprent the side length of the triangle john drew? 10,11,12 13,15,17 16,18,21 17,17,17•• Correct me!!

**Math HELPP**

After increasing the price by 15%, the price of the book becomes 45. What was the original price of the book?

**maths**

helpp! i am very confused on how to roundup decimals with 1st significant figure, 2nd figure and third figure.These are the decimals : . 6.35228 . 34.026 . 0.005708 . 150.932 . 0.00007835 Pleas guide me through so I will know what to do.

**Ap english**

I have to write an essay that compares and contrasts the rhetorical strategies of tone, lexicon, and syntax from two sermons given by the same person. How do i do this??? Helpp please!! (the sermons are called "Beauty of the World" and "Sinners in the Hands of an Angry God" by...

**physics**

Find the Magnitude of the force exerted by each cable to support the 625 N punching bag. One cable is connected to the ceiling with an angle of 37 degrees and the other cable is connected perpendicular to the side wall (Horizontal). HELPP

**physics**

Find the Magnitude of the force exerted by each cable to support the 625 N punching bag. One cable is connected to the ceiling with an angle of 37 degrees and the other cable is connected perpendicular to the side wall (Horizontal). HELPP

**physics**

A scuba diver has an air tank with a volume of 0.010 m^3. The air in the tank is initially at a pressure of 1.0x10^7 Pa. Assume that the diver breathes 0.400 L/s of air. Find how long the tank will last at a depth of each of the following. (a) 1.0 m min (b) 10.0 m min Please ...

**physics**

A scuba diver has an air tank with a volume of 0.010 m^3. The air in the tank is initially at a pressure of 1.0x10^7 Pa. Assume that the diver breathes 0.400 L/s of air. Find how long the tank will last at a depth of each of the following. (a) 1.0 m min (b) 10.0 m min Please ...

**ratio and proportions**

a fruit punch recipe calls for 3 parts of apple juice to 4 parts of cranberry juice . how many liters would be added to 4.5 L of apple juice?????? please helpp

**HELPP**

The volume of a rectangular prism can be computed using the formula V = lwh. What is the width of a prism that has a volume of 1664 cubic centimeters, a length of 16 centimeters, and a height of 8 centimeters? A. 11 cm B. 13 cm C. 26 cm D. 768 cm

**physics please helpp**

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ... a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ? b)... the ...

**SCIENCE!!**

what is a fulcrum, the effort and the load? also what is a Class 1 lever, Class 2 lever, and Class 3 lever? plz helpp! thanks:)

**physics to Elena please reply**

A scuba diver has an air tank with a volume of 0.010 m^3. The air in the tank is initially at a pressure of 1.0x10^7 Pa. Assume that the diver breathes 0.400 L/s of air. Find how long the tank will last at a depth of each of the following. (a) 1.0 m min (b) 10.0 m min Please ...

**GERRRMAANN!**

I need help fixing these sentences, I'm supposed to conjugate the verbs and add an ariticle, pleasseee HELPP !: 1. Herr/Kommen/neun uhr 2. Wir/kenne/Computerspiele 3. Kaufen/ihr/Gitarre 4. Computer/sein/ganz neu 5. Wann/begginen/Film 6. Haben/anna/Schultasche Thankkkksss, Teutaa!

**Environmental Helpp!**

Why would a 1 L bottle of water cost $1.50 whereas 1 L of gasoline currently costs about 90 cents? Discuss our current consumption of bottled water with specific emphasis on its relatively cleanliness compared to tap water, where the water comes from, how it is regulated, and ...

**Helpp!!! physic...**

In the experiment Standing Waves,if you continue to lwer the water level after recording l(m) at the first sound resonance at fixed tuning fork frequency, you will hear the sound again but sound gets louder (second resonance). At this point, by what factor has l(m) increased? ...

**your preciouss helpp please**

how can you condense these cos^3x* cos2x^2 cos^3x+ cos2x^2 cos^3x- cos2x^2 Thank you soo much

**ratio/proportions**

a geologist found that silt was deposited on a river bed at the rate of 4cm every 170 years , how long would it take for 5 cm of silt how long would it to be deposited ???? plz helpp

**HELPP math**

13,14,29,26,41,53,60,7,89,14 Based on the numbers above what is the variance and the standard deviation of the data set. I think 616.2 is the variance I think 24.83 is the standard deviation Am I correct????