# chemistry! URGENT

59,905 results, page 3

### urgent math

solve 4(7^(x-2)) = 8

### MATH URGENT!

SIMPLIFY: x^2-4x-3

### algebra 1 honors

If r=5/3r+20/3, what is r? URGENT!!!!

### Math URGENT!!!

-32=8/7(3w - 1) Find w.

### maths

2x+5=x+9 urgent help needed

### Urgent math help

what is the x intercept y = -5x+20

2^-4 = -2 * -2 * -2 * -2 =16

### analytical chemistry

a 0.4617g sample containing sodium bicarbonate was dissolved and titrated with standard 0.106M of hydrochloric acid solution , requiring 40.72ml. the reaction is: HCO3- + H+ -> H2O + CO2 Calculate the percent sodium bicarbonate in the sample. (Given molecular weight of ...

### This needs tobe turned in in 10min AT MOST URGENT!

1. x over 5= –2 (1 point) –45 35 –10 21 2. 13x – 7 = 136 (1 point) 11 15 8 9 3. Solve the following equation: 3x – 3 = 15 (1 point) 4 5 6 7 4. Ernesto loses 14.5 pounds in 7 months. Now he weighs 156.5 pounds. Which equation can be used to find how much he weighed ...

### chemistry urgent

a mixture of NO, CO2, and O2 gases has a total pressure of 2.5x10^3 torr. if the partial pressure of NO is 800 torr and CO2 is 600 torr, what is the partial pressure of O2? Dr. Bob. Please help

### Algebra 2 URGENT

Simplify: 2x+5/4x^2 + 2x-5/10x

### Algebra 2 URGENT

Simplify: 2x+5/4x^2+2x-5/10x

how do i convert 4 g/ml to kg/m^3 ?

Simplify 8(2^x-1)=64

### HELP! URGENT!

What is the pH of a 0.030M solution of KF? Ka of HF is .2 x 10^-4. THNX!

### Math Urgent

Evaluate 2 ∫ |x+1| -3

y= u+3/u-1 u=x^1/3 find dy/dx at x=8

### ALGEBRA 2 URGENT

6x/x-8 - 7x/x-1 = 5/x(2)-9x+8 / is fraction (2) is squared

### Math URGENT!

2. 9X-2=34+3X 4.x/3-15=12+x 6.11+4x=7+5x 8.-7+x=-8-x 10.0.45x+25=40+0.25x

### URGENT MATH

Find h(t) + k(t) if h(t) = {(-4,5), (-2,-3), (0,5), (1,3), (3,-1), (5,5)} and k(t) = {(-3,-2), (-2,6), (-1,0), (1,0), (2,-6), (3,5), (4,0), (6,-2)}. (2 marks)

### CALCULUS HELP URGENT!!

find y' if arctan(xy)=6+x^(4)y

### math URGENT thx

what is the rule? x 5 7 9 11 y 1 1.6 1.8 2.2

### math(urgent)

if x+ y is 25 more than x-y then x is what percent of y ?

### calculus(urgent pls)

Integral of 1/[x^2(1+x^2)]

### maths. It's urgent

solve for the value of x and y. X+y=15 x^y+y^x=30

### Chemistry URGENT

I'm filling out those missing value charts with atomic numbers, protons, charge, etc. The info i've been given is protons (4), neutrons (5), electrons (2). I got 4 for th eatomic number, and 2 for the charge. The problem is the atomic mass. Once I got 6, the other time I got 9...

### Chemistry -pls help urgent

1) How do I prepare 2M nitric acid from 65% concentrated nitric acid? 2) How do I prepare 17% ammonia from 25% concentrated ammonia? Please show calculation steps. Thanks.

### Urgent Chemistry

The diffusion current for a standard is 1 x 10^-4M solution of hydroquinone is 17.5 microamperes. An unknown solution of hydroquinone, when diluted hundred folds and polarographed under same conditions yielded a current of 30.5 microamperes. Calculate the concentration of ...

### English

Original sentence: The urgent care center offers a variety of services such as physician appointments, mental health, health education programs, and lab and X-ray work. My corrections: The urgent care center offers physician appointments, mental health evaluations, health ...

### CHEMISTRY: URGENT DRBob222

Why was the reaction mixture titrated quickly? (question fom: A mixture of 0.50 mol of ethanoic acid and 1.00 mol of ethanol was shaken for a long time to reach equilibrium. The whole mixture was titrated quickly with 1.00 mol dm3 sodium hydroxide and 80cm3 of alkali were ...

Determine whether the solution is basic, acidic, or neutral. Write net ionic equations to show how it behaves in aqueous solutions. 1) Fe2(SO4)3 I know it is acidic Do I do hydrolysis equations for the net ionic or do I do redox reactions?

### Chemistry

A solid metal is often known as having 'an array of positive ions in a sea of electrons'. Write down the electronic structure of magnesium atom and use it to explain what this phrase means. Actually I don't know how to explain it. So I need you to explain it in your own words...

### Quick Question (URGENT)

What does this symbol mean (#) thank you

### Pre-calc-urgent

How do you find a formula for f(x) and g(x) if h(x)=f[g(x)] h(x)=(2x^3-5)^4

### MATH

HOW TO SOLVE THIS? ã8(ã10-1) PLEASE IT IS URGENT !!!!

Simplify (10x^2-6x-x^3)+(9x+x^3+5x^2)

### maths

how do you get 45 percent of something urgent thankyou

3/4(2x-1)-5 is equal or greater than 5/4(x-3)

### Integers (urgent)

For what integer values of x is x+1-2 positive?

### Algebra 1--Please, help me! This is urgent!

Solve each equation. 1). 4/5y + 1/3 <= -y 2.) 4/5h => -2

### Math! URGENT

Solve the inequality -5p>-30 A. p>6 B. p<6 C. p>-35 D. p<35 Is the answer B?

### Math-urgent-

What's 11/12 divided by 3/4 in repeated subtraction?

### Maths (URGENT!!!)

2).Find the sum to n terms of 1/(1.2.3) + 3/(2.3.4) + 5/(3.4.5) + 7/(4.5.6)

### math too urgent

how to construct 75 degree angle

Tan20+4sin20=√3

### Chemistry URGENT

can someone please tell me what formula's to use for the 2 following chemistry problems. 1. Calculate the solubility of potassium bromide at 23 degrees Celsius. hint. Assume that the solubility increases by an equal amount for each degrees between 20 degrees C and 30 degrees C...

### chemistry

silver iodide powder has been used as and antiseptic and as and agent to seed clouds for rain . silver iodide is 45.9% silver by mass . if you separtate a 50-g sample of silver and iodide , how much iodide is into its elements, silver and iodide how much silver would you have...

### Chemistry - urgent

The following is part of a procedure for a limit test for sulphates in an NaOH sample:- Dissolve 3.0g of NaOH in 6ml of deionized water, adjust to pH 7 with HCl (approx.7.5ml) and dilute to 15ml with deionized water. Please explain how to perform this procedure. Conc HCl or 1M...

### Social Studies (URGENT)

Okay,I need to create a newsletter on the olden days. The year is 1599 and I have to write 3 paragraphs on 3 different people. 1 play review, 1 song review and 2 editorials. I am currently writing about: Paragraphs: - The Battle of Curlew Pass (Red Hugh O'Donnell) - The grand ...

### chemistry final-urgent

Choose the element with the highest ionization energy element: Na, Mg, Al, P, S In my book: ionization energy increase from left to right and bottom to top. Na<Mg<Al<P<S S is highest ionization energy? my instructor review this problem and his answer is P is a ...

### Chem Urgent!

What is the number of grams for 1 mol lead?

### Math(urgent)

Find the domain of the function. s(y)= 3y over y+5

### US HISTORY THIS IS URGENT!!

WHAT WERE THE PEOPLE OF MASSACHUSETTS LIKE IN THE 1620S?

### Algebra 2 URGENT

Solve each open sentence. x-5/9<or=to2x/15-2/5

### Algebra 2 URGENT

Simplify cubed root of 135

Solve. Square root of 3x+4=x

### urgent precal

What is cosx/ (secx-1) not in fractional form?

### College Algebra URGENT

Sentence for the word BEATIFICALLY?!?

### Algebra (URGENT)

Put this into function form: 2x+5y=20 Thanks!

### Urgent ~ Math

3(x – 4) = 5(x + 2) (1 point) x = 11 x = –11 x = 1 x = –1 I think this is 11 am i correct or am i wrong?

### math very urgent

What is the area of a shape that that has 8 sides and has 1 , 1 , 8 , 1 , 1 , 3 , 3 and 10?

### maths- urgent

show that √Π+1 is irrational

### maths- urgent

what is the value of sin18degree-sin66degree+(root3/2)

### ALGEBRA HELP! URGENT!

FACTOR: 36x^2+132xy+121y^2

### urgent heeeelp!

Divide: -39x^4 by underroot13 multiplied by x^2

### Math- urgent

How can -2.65 be written as the ratio of two integers?

### English - Very urgent

How does pearls represent hope?

### Mathw(URGENT pls)

Find the sum to n terms of 1/(1.2.3) + 3/(2.3.4) + 5/(3.4.5) + 7/(4.5.6)

### Maths(URGENT pls!!!)

Find the sum to n terms of 1/(1.2.3) + 3/(2.3.4) + 5/(3.4.5) + 7/(4.5.6)

### math urgent

Prove : Tan20+4Tan20=√3

any math teachers around?

### urgent!

What is the approximate size of an amino acid's backbone?

### Algebra II

What is the sum of the geometric series 12 E 2(1/2)^x x=0 4 0 2 3 PLEASE HELP Urgent

### URGENT! chemistry- percentage yield

heating an ore of antimony sulfide in the presence of iron gives th element antimony and iron(2) sulfide. when 15.0 antimony sulfide reacts with an excess of iron, 9.84 g antimony is produced. what is the percent yield of this reaction?

### Chemistry (URGENT)

Calculate the molarity of the Co^2+ ion in each of the solutions 1-5. The new molarity is given by the molarity of the stock solution multiplied by the dilution factor. Solution: Co(NO3)2 Original molarity: 0.160 Dilution #1: none D#2: 12mL to 16mL D#3: 8mL to 16mL D#4: 4mL to...

What concentration of silver chromate (Ksp = 9.0 x 10-12) will dissolve to make a saturated solution in water? *For this one the formula is Ag2CrO4, which is [Ag]^2[CrO4]. I plugged x in for CrO4, so x^3 is equal to Ksp. I then got that x = 2.0e-4. However, that x is for CrO4...

### URGENT -- Chemistry

When 0.500 g of an unknown compound was dissolved in 15.0 g benzene, the freezing point depression was determined to be 0320C. The molar mass of the unknown compound is ?? g/mol. (The freezing point depression constant for benzene is 5.12C kgmol. I really don't know where to ...

### calculus urgent

If you are given a graph of a function, how do you draw the derivative?

### World Geography URGENT!

What are the main economic activities for Switzerland?

### Chem Urgent!

Does anyone here know anything about bowel movements?

### english(URGENT)

What is the message of the heart and soul of Harper Lee?

### CHEM..URGENT!

What is produced at each electrode in the electrolysis of NaBr(aq) and AgF(aq)?