Friday

April 25, 2014

April 25, 2014

Total # Posts: 457

**Chemistry**

I'm having trouble trying to figure out how to setup and solve these problems: 1) 2,600.0 mL of air is at 20.0C. What is the volume at 60.0C? 2) A gas occupies 900.0 mL at a temperasture of 27.0C. What is the volume at 132.0C? 3) What change in volume results if 60.0 mL of...

**Chemistry**

Oxygen gas, from the decomposition of KClO3, was collected by water displacement. The pressure and temperature in the lab during the experiment were 451.0 torr and 20.0 C. What was the partial pressure of oxygen?

**Math**

Ms.Jackson decided to do a little shopping after school. She stopped at target to buy two new cake pans. One had a 4in diameter and the other had a 8in diameter. How much greater is the area of the larger pan?

**geography**

What are the major challenges facing the Balkan countries?

**math**

what is the value of a saving account after 12years when $12,000.00 is initially deposited and interest is earned at the rate of 4.5% compounded quarterly

**physics**

The difference in energy between allowed oscillator states in HBr molecules is 0.330 eV. What is the oscillation frequency of this molecule?

**physics**

A LiBr molecule oscillates with a frequency of 1.7×1013 Hz. (a) What is the difference in energy in eV between allowed oscillator states? (b) What is the approximate value of n for a state having an energy of 1.0 eV?

**physics**

(a) If the first-order maximum for pure-wavelength light falling on a double slit is at an angle of 10.0º, at what angle is the second-order maximum? (b) What is the angle of the first minimum? (c) What is the highest-order maximum possible here?

**Statistics**

Battery manufacturers compete on the basis of the amount of time their products last in cameras and toys. A manufacturer of alkaline batteries has observed that it's batteries last for an average of 26 hours when used in a toy racing car. The amount of time is normally dis...

**Physics**

how to find the max height of a cat that is thrown at 9.8 m/s and is in the air for a total of 4 seconds.

**biology**

3.68kg=____________g

**calculus**

Some scientists believe that the average surface temperature of the world has been rising steadily. They have modeled the temperature by the linear function T = 0.02t + 8.75, where T is temperature in °C and t represents years since 1900. (a) What do the slope and T-interc...

**Chemistry**

Briefly outline a procedure you could use to determine the HC2H3O2 concentration in a vinegar sample. What would the pH be at the equivalence point of the titration? Briefly explain

**statistics**

MBA604 Statistics Assignment 1 Part 1 1) (5 pts) An electronics company is about to launch a new product. If the serial number for each piece produced has the following format: LLNNN where L stands for any letter in the English alphabet and N is a number from 0 to 9, please an...

**statistics**

MBA604 Statistics Assignment 1 Part 1 1) (5 pts) An electronics company is about to launch a new product. If the serial number for each piece produced has the following format: LLNNN where L stands for any letter in the English alphabet and N is a number from 0 to 9, please an...

**physic**

Fg=(GMeMsun)/r^2 Fg=((6.67*10^-11)(5.98*10^24)(1.99*10^30))/(1.5*10^11)^2 Fg=3.53*10^22

**Statistics **

Scores on a mathematics examination appear to follow a normal distribution with mean of 65 and standard deviation of 15. The instructor wishes to give a grade of “C” to students scoring between the 60th and 70th percentiles on the exam. What score represents the 60th...

**Statistics Please Help**

One reason for standardizing random variables is to measure variables with: A. dissimilar means and similar standard deviations in like terms B. different means and standard deviations on a non-standard scale C. similar means and standard deviations on two scales D. different ...

**reading/math**

Hey Mrs.sue, can you answer this question:How does the author establish the setting in the first chapters of the watsons go to Birmingham?

**reading **

What kind of relationship does Kenny and Joetta have?

**reading**

How does the writer in the watsons go to Birmingham make the reader sympathize with Larry Dunn

**Multiplication**

3733750

**Math**

Ft is a periodic function with a period of 7 and an amplitude of 3. What is the period and amplitude of the function g(t)=-2f(1/3t)-5? Can someone show me what I need to do?

**Math**

Ft is a periodic function with a period of 7 and an amplitude of 3. What is the period and amplitude of the function g(t)=-2f(1/3t)-5? Can someone show me what I need to do?

**Chemistry**

Given that 1g of Phenacetin requires 82mL of hot water to dissolve, or 1310mL of cold water (TY= 3.92g): 1) How much water will you need to recrystallize the theoretical yield? 2) How much product will be lost because of recrystallization?

**math**

How many integers satisfy the inequality \left| \frac { 10(x+1) } {x^2 + 2x + 3 } \right| \geq 1?

**Geometry**

ABCD is a quadrilateral inscribed in a circle with AB = 1, BC = 3, CD = 4 and DA = 6. What is the value of \sec^2 \angle BAD?

**math**

You deposit $24000 in an account that pays 2.4% annual interest compounded continuously. What is the balance after 5 years?

**Solving Rational Equations**

4x/x-5=8/5-x

**structurlal design 2**

Thanks...

**structurlal design 2**

15. Sagging in floor joists is typically caused by A. oversized joists. B. undersized joists. C. improper nailing of sub-flooring. D. improper moisture content of the wood i think it's D.

**home inspection**

16. Brick ties in brick veneer walls allow for A. water drainage. B. air circulation. *C. expansion. D. inspection.

**home inspection**

11. Structural failure in a roof may be due to A. the presence of a vapor barrier between the attic floor and the ceiling below. B. too little span between supporting members. C. cuts made in rafters or trusses for addition of components such as stairways and fans. *D. use of ...

**maths**

Consider the polynomial f(x)=17x4+21x3+60x2+Ax+B. Suppose that for every root λ of f(x)=0, 1λ is also a root of f(x)=0. What is the value of A+B?

**Calculus**

P = P(0)e^(kt) (1/2) = e^(10k) ln(1/2) = 10k k = (1/10)ln(1/2) ---------------- 6 = 18e^((1/10)ln(1/2)t) (1/3) = e^((1/10)ln(1/2)t) t = 10[ln(1/3)/ln(1/2)] t = 10[-ln(3)/-ln(2)] t = 10[ln(3)/ln(2)]

**AP Chemistry**

a 6.33-Liter football is filled with air at 1.75 atm at 25.5 degrees Celcius. At the same temperature, the volume of the football is reduced to 2.35 Liters. What is the pressure of air in the ball?

**algebra**

write an equation in slope intercept form ha an x-intercept of 6 and y intercept of 3

**math**

solve the following exponential expression. e^x+e^-x=6

**math**

solve the equation log lower 6(x+9)-log lower 36 x =1 the 6 and 36 should be dropped down, then (x+9) and the x are higher. Please show work

**math**

use properties of logarithms to condense the loarithmic expression. write expression as a sinle logarithm whose coefficient is 1. where possible evaulate the expression. 1/8[3 In(x+5)-In x-In(x^2-4)] Please show work

**math**

write the expression as a sinle logarithm. express powers as factors. In (x/x-1)+In(x+1/x)-In(x^2-1) Please show work.

**math**

it is written as you have it written the first time. I couldn't make out the question. It made no sense to me.

**math**

log lower 4(x+2)=log lower 4 7. does this make sense know? How do you make the lower sign to be able to get the 4 lower??

**math**

Solve the following equation. log4(x+2)=lo4^7 Both of the 4's should be dropped down.

**calculus**

solve the following exponential equation 9^x=6 I get In6/In9 what is the answer approximated three decimal places?

**calculus**

Solve the equation in the real number system X^4+11x^3+24x^2-23x+35=0 Please show work

**english**

please proofread my contrast and comparision paper Another War for the People of the United States Although the Air Force, Navy, and Army were different in the 1940's and the 200's show that, even though technology and communication have improved, conflicts between oth...

**Chemical Engineering: Raoult's Law**

n = 100

**physics **

A 1,600 kg car is traveling at a speed of 12.5 m/s. What is the kinetic energy of the car?

**Social studies**

what is me

**Math**

Find the magnitude and direction of the vector AZ: A(8,8) and Z (1,-3)

**Math**

A plane flying at an altitude of 10,000 feet begins descending when the end of the runway is 50,000 feet from a point on the ground directly below the plane. Find the measure of the angle of descent (depression) to the nearest degree.

**Chemistry**

Calculate the equilibrium constant at 300 K for the reaction HgO(s) ↽⇀ Hg(ℓ) + 1/2O2(g), given the data delta S delta h kJ J/K mol mol HgO(s) 70.29 −90.83 Hg(ℓ) 76.02 0 O2(g) 205.14 0

**Chemistry**

Calculate the entropy change when 2.42 g of H2 reacts with O2 according to the reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free energy o...

**7th grade masth asap hurry plz ms.sue somebody plz**

Anonymous, you're a snitch...

**Chemistry**

Given the standard heats of reaction Reaction ∆H0 M(s) + 2 X2(g) → MX4(g) −123.7 kJ/mol X2(g) → 2 X(g) +297.3 kJ/mol M(g) → M(s) −25.1 kJ/mol calculate the average bond energy for a single M X bond. Answer in units of kJ/mol

**Chemistry**

One mole of carbon (12.0 g) in the form of crystalline graphite is burned at 25 ◦ C and 1.000 atm pressure to form CO2(g). All of the heat produced is used to heat a 4560 g bath of liquid water, originally at 25 ◦ C. What is the ﬁnal temperature of the water...

**Chemistry**

The combustion reaction for benzoic acid C6H5CO2H(s) + 15 2 O2(g) → 7 CO2(g) + 3 H2O(ℓ) has ∆H0 = −3226.7 kJ/mole. Use Hess’s Law to calculate ∆H0 f for benzoic acid.

**Algebra....HELP!!**

Explain how to factor the following trinomials forms: x2 + bx + c and ax2 + bx + c. Is there more than one way to factor this? Show your answer using both words and mathematical notation.

**science**

i have a work sheet to do it gives me the atomic number and the mass number of elements i have to fill in the missing electrons protons neutrons

**chemistry**

The enthalpy of combustion of benzoic acid (C6H5COOH) which is often used to calibrate calorimeters, is −3227 kJ/mol. When 1.402 g of benzoic acid was burned in a calorimeter, the temperature increased by 3.401 ◦ C. What is the overall heat capacity of the calorime...

**chemistry**

When 0.572 g of compound X is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.461 ◦ C is observed. What is ∆Urxn for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3.75 kJ/ ...

**chemistry**

The enthalpy of combustion of benzoic acid (C6H5COOH) which is often used to calibrate calorimeters, is −3227 kJ/mol. When 1.402 g of benzoic acid was burned in a calorimeter, the temperature increased by 3.401 ◦ C. What is the overall heat capacity of the calorime...

**chemistry**

How much heat is required to heat 28 g of solid silver from 130 ◦ C to liquid silver at 961 ◦ C? The speciﬁc heat of solid silver is 0.235 J/g · ◦ C, and the heat of fusion of silver at its melting point of 961 ◦ C is 11.3 kJ/g. Answer in ...

**chemistry**

A piece of a newly synthesized material of mass 25.0 g at 80.0 ◦ C is placed in a calorimeter containing 100.0 g of water at 20.0 ◦ C. If the ﬁnal temperature of the system is 24.0 ◦ C, what is the speciﬁc heat capacity of this material?

**english**

locate the gerund or gerund phrase and identify its noun function in the sentence " i helped by preparing dinner"

**College Algebra**

Use the distributive property to rewrite the expression (b+6)8=

**algebra**

y=x+z x=8 z=12 what is that value?

**Algebra 1A**

I am so lost! Solve the equation and check the solution -6(t-2)-(t+3)=2 The solution to t is ??

**algebra 1**

Do the equations x = 4y + 1 and x = 4y - 1 have the same solution? How might you explain your answer to someone who has not learned algebra?

**Algebra 1**

Do the equations x = 4y + 1 and x = 4y - 1 have the same solution? How might you explain your answer to someone who has not learned algebra?

**Math (Algebra 1)**

Can u explain in words how to do that because I still do not get it using numbers

**Math (Algebra 1)**

|(2x-5)/3| = |(3x+4)/2|

**Algebra 1**

How many solution sets do systems of linear inequalities have? Do solutions to systems of linear inequalities need to satisfy both inequalities? In what case might they not?

**Algebra 1**

What are two symbolic techniques used to solve linear equations?

**math**

using digit 1,2,3,4 and 5 to form a 2-digit and a 3 digit number so that the product is the least product possible. using each digit only once

**psychology**

why would apa format help me in college?

**Algebra I**

How do you write a system of linear equations in two variables? Explain this in words and by using mathematical notation in an equation. What steps will be taken to solve the system that you provided?

**Algebra 1**

what is the difference between a scatter plot and a line graph?

**Algebra 1**

The perimeter of a rectangle equals the sum of the lengths of its four sides. If the width of a rectangle is 4 inches and its perimeter is 36 inches, find the length of the rectangle. The length of the rectangle is ? My answer was 144, is this correct?

**math**

Solve the linear inequality x/7 +3x/14 ≤ 4/7 The solution set is?

**Algebra 1**

t≤-18

**Algebra 1**

Use the formula d=rt to find the value of the missing variable d= 48 feet, t= 16 seconds r= ? ft/sec

**Math Geometry**

356.8195481472908

**3 grade math ms sue**

i love you ms.sue you,re so sexy//////////////////u,h87f8tfe from frist boy in front seat in your class

**3 grade math ms sue**

ju897780pogo976tg 76ghfgjbv8k8

**computers**

128

**Science**

Why does seafloor spreading occur?

**health**

when was the u.s air line banned soming in 1964

**Government**

Wait hold on it has to be motor voter laws?

**Government**

I went to it and read it and i got C am i right?

**Government**

the problem is that i don/t know the answer :(

**Government**

Which of the following tactics did many States once use to disenfranchise African American voters? A. "motor voter" laws B. age requirements C. literacy test D. purging

**government**

I think B

**Algebra**

/| / | / | b / | / | 20 / | / | /_______| a a+b=20

**chemistry**

A scientist measures the standard enthalpy change for the following reaction to be -53.4 kJ : Ca(OH)2(aq) + 2 HCl(aq) CaCl2(s) + 2 H2O(l) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2O(l) is kJ/mol

**chemistry**

A scientist measures the standard enthalpy change for the following reaction to be -53.4 kJ : Ca(OH)2(aq) + 2 HCl(aq) CaCl2(s) + 2 H2O(l) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H2O(l) is kJ/mol

**Chemistry**

45

**math**

Mariah is planting a rectangular rose garden. In the center of the garden, she puts a smaller retangular patch of grass. The grass is 2 ft by 3 ft. What is the area of the rose garden?

**Geometry**

name the integer values of x that form a triangle with 12-x, 12, 12+x

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