# alexis

Most popular questions and responses by alexis-
## Chemistry

Predict how the entropy of the substance is affected in the following processes: a) O2 (g,200 kPa, 300k) --> O2 (g, 100, 300k) b)Br2 (l, 1 bar, 25 degree C) --> Br2 (g, 1 bar, 25 degree C) C)Fe (s, 1 bar, 250 degree C)--> Fe(s, 1 bar, 25 degree C) will

*asked on April 20, 2014* -
## Chemistry

Calculate ΔG° for the following reaction at 298 K.? A+B --> 2D ΔH° = 775.0 kJ ΔS°=296.0 J/K C --> D ΔH° = 446.0 kJ ΔS°=-218.0 J/K A+B --> 2C ΔG° = ? kJ I know I am suppose to reverse the (C --> D) and add a coefficient of 2 to both the enthalpy

*asked on April 20, 2014* -
## Art

PLEASE HELP!!! And if you know all the answers to the lesson that would be great!!! There's 5 questions and the last one is a picture, just to make sure we are on the Same lesson. Which statement is the best comparison of the symbolism behind Chinese in

*asked on February 16, 2016* -
## Chemistry

Using a table of standard reduction potentials, determine the best answer to the following questions. a) Which of the following reagents would oxidize Cr to Cr3 , but not Ag to Ag ? Choices: Ca^2+, Br2, Co^2+, Ca, Br^-, or Co. b) Which of the following

*asked on May 4, 2014* -
## Chemistry

which equation represents an oxidation-reduction reaction? 1.HCl+KOH-->KCl+H2O 2.4HCl+MnO2-->MnCl2+2H2O+Cl2 3.2HCl+CaCO3-->CaCl2+H2O+CO2 4.2HCl+FeS-->FeCl2+H2S

*asked on March 20, 2011* -
## Chemistry

In the reaction 2H2S + 3O2 -> 2SO2 +2H2O, the oxidizing agent is 1.oxygen 2.water 3.sulfur dioxide 4.hydrogen sulfide oxygen?

*asked on March 20, 2011* -
## Math Word problem !

Sarah works in an appliance store. She gets a commission in addition to her hourly pay. She earns a 2% commission for sales up to $4000 and a 4% commission for all sales in a month above $4000. Last month her sales were $5200. How much was her commission?

*asked on January 29, 2013* -
## Chemistry

Hydrogen peroxide can act as either an oxidizing agent or a reducing agent, depending on the species present in solution. Write balanced half-reaction equations for each of the following: (a) H2O2(aq) acting as an oxidizing agent in an acidic solution.

*asked on April 28, 2014* -
## Math help plz?

6. Which inequality matches the graph? The graph is -3 -2 -1 0 1 2 3 4 and there is a red line from 1 to -3 The answer is 3x + 1 _< 4 but idk why? 19. Which inequality matches the graph? -3 -2 -1 0 1 2 3 4 and it has a red line from 2 to 4 the answer is 8p

*asked on December 18, 2015* -
## Chemistry

If delta H°rxn and delta S°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is a)enthalpy driven to the left. b)entropy driven to the right. c)entropy driven to the

*asked on April 20, 2014* -
## Chemistry

use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. on the chart is said ethane(C2H6) is -84.0. In

*asked on April 28, 2014* -
## math, I need help please answer quickly!

A) Estimate 49% of 162 B) Use mental math to calculate 49% of 62

*asked on January 13, 2018* -
## third grade math

How do I answer this......Write three ways to find 3x2x4.

*asked on January 13, 2011* -
## Math

Victoria rolls a number cube numbered 1-6 three times. What is the probability that she will roll a 5 on each roll?

*asked on April 3, 2016* -
## college physics

Arthur (mass 78 kg) and Violet (mass 31 kg) are trying to play on a seesaw. If Violet sits 3.6 m from the fulcrum, at what distance from the fulcrum should Arthur sit?

*asked on October 13, 2010* -
## Chemistry

human blood contains dissolved carbonc acid in equilibrium with carbon dioxide and water according to the reaction: h2CO3(aq)CO2(aq)+H2O(l) explain why decreasing the concentration of Co2 will ultimately decrease the concentration of H2CO3.

*asked on March 17, 2011* -
## geography

The Fujiwara rose to power by ____? A. making a fortune through trade B. waging war on other clans. C. having their daughters marry emperors D. defeating the Mongol invaders** Please correct me if I'm wrong.

*asked on February 5, 2019* -
## Chemistry

A 0.170-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant (Kf) of Co(NH3)62 is 5.0× 1031 M–6. I don't really know how to start. At first I thought about

*asked on April 14, 2014* -
## fgcu

More than a decade ago, high levels of lead in the blood put 88% of children at risk. A concerted effort was made to remove lead from the environment. Now, suppose only 12% of children in the United States are at risk of high blood-lead levels. (a) In a

*asked on March 27, 2013* -
## MATH

WHICH BENCHMARK FRACTION COULD YOU USE TO ESTIMATE THE PRODUCE OF 36 X 11/16?

*asked on March 24, 2013* -
## physics

A 4.00 kg ball traveling North with a momentum of 11.2 kg.m/s collides with a 6.0 kg ball traveling West with a momentum of 18 kg.m/s. The two balls stick together and head off as one. What is the momentum of the combined masses? What is the velocity of

*asked on April 19, 2015* -
## 7th grade math

Not sure how to solve this: Suppose your school is selling magazine subscriptions. Each subscription cost $20. the company pays the school half of the total sales in dollars. The school must also pay a one-time fee of $18. What is the fewest number of

*asked on October 17, 2014* -
## 7th grade Math/Science

Can you help me with this science question: from sea level, the biosphere goes up about 9km and down about 19km. What is the thickness of the biosphere in meters? (there wasn't a formula in the workbook). Thanks

*asked on August 20, 2014* -
## Chemistry

Which of the following processes are spontaneous? (Select all that apply.) a. average car prices increasing b. a soft-boiled egg becoming raw c. a satellite falling to Earth d. water decomposing to H2 and O2 at 298 K and 1 atm I thought it would c and

*asked on April 18, 2015* -
## Algebra

A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows: First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0

*asked on April 18, 2017* -
## Trigonometry

A cat, sitting on top of a tree, spots a dog and a firefighter, both on flat ground below. From the cat's point of view, the dog is 10m south, at an angle of depression of 65 degrees, and the firefighter is some distance east of the tree, at an angle of

*asked on December 13, 2015* -
## 8th grade science

I'm not sure what's the correct answer: 9)Which of these characteristics can only be attributed to a wave of red light? A)The energy of the wave travels in the same direction as the wave travels. B)The wave travels by vibrating the particles of the medium

*asked on March 7, 2016* -
## algebra 1

1. Which of the following is equivalent to x^5y^2/xy^2 when x not= 0 and y not= 0? a. x^6y^5 b. x^5y c. x^4y d. x^4

*asked on January 18, 2018* -
## Investing ( pease help)

Maxwell Feed & Seed is considering a project that has the following cash flow data. What is the project's IRR? Note that a project's projected IRR can be less than the WACC (and even negative), in which case it will be rejected. WACC 10.00% Year 0 1 2 3 4

*asked on July 28, 2009* -
## Math

Sustem of equations. I have to solve the system of equations by graphing and solving. Ther are thirty-three students in the Chess Club. There are five more boys than girls in the club. Write and solve a system of equations to find the number of boys and

*asked on January 29, 2013* -
## 7th grade math (probability)

I'm posting corrections from yesterday in addition to new ones. Still not sure how to answer #4. 2. Edwin rolls a number cube and then spins a color from a color card (red, yellow, blue, green, white). What is the probability that he will roll an even

*asked on May 6, 2015* -
## Social Studies

7. Select one movement from the Progressive Era. Describe the movement and its impact reform on South Carolina. Provide details and examples that support how this movement changed South Carolina. I chose the civil right movement I just don't know how to

*asked on April 12, 2016* -
## Math Personal Finance

Assume a 30-month CD purchased for pays simple interest at an annual rate of 5.5%. How much total interest does it earn? What is the balance at maturity?

*asked on June 8, 2014* -
## 7th grade math

Can you check the following? 10. A store pays $10 for a bracelet, and the markup is 115%. A customer will also pay 5 1/2% sales tax. What will be the total cost of the bracelet to nearest cent? t = 1.15 x 10 t = $11.5 (markup price) t = $10 + 11.5 t =

*asked on January 16, 2015* -
## Consumer math

A deposit of 4,000 at 9.5% for 270 days

*asked on April 30, 2015* -
## Science

A hydraulic lift office chair has its seat attached to a piston with an area of 11.2 cm2 . The chair is raised by exerting force on another piston, with an area of 4.12 cm2 . If a person sitting on the chair exerts a downward force of 219 N, what force

*asked on September 29, 2012* -
## Chemistry

A gas has a density of 1.25 g/L at STP. What is its molecular mass?

*asked on September 2, 2010* -
## SCIENCE

WHAT HAPPENS IF EARTH'S MINERALS ARE USED UP? Will more grow or will there be no more Some minerals are being formed all the tme; others are not and will die out, so to speak, or be redustributed and any one site will be too small to pay to mine.

*asked on December 11, 2006* -
## SS

How did the Mexican-American War ignite a conflict over slavery between the North and the South?

*asked on May 26, 2016* -
## General Chemistry

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3(s)+2HCl(aq)--> CaCl2(aq)+H2O (l)+CO2(g) How many grams of calcium chloride will be produced when 32.0 g of calcium carbonate are combined

*asked on February 6, 2013* -
## math

An urn contains 10 red balls, 6 green balls, 15 orange balls, and 14 blue balls. If one ball is randomly drawn from the urn, what are the odds against the ball being red? State your answer as a ratio using a colon to separate the two numbers.

*asked on November 2, 2017* -
## Math

Example of a real-world relationship where there is no clear independent or dependent variable.

*asked on January 13, 2015* -
## Science

Which are reasons to get a claim peer reviewed? Check all that apply. A peer review verifies conclusions. A peer review proves everyone else wrong. A peer review maintains standards of the field. A peer review identifies sources of errors. A peer review

*asked on September 13, 2015* -
## physics

an arrow is shot at a 30 degree angle with the horizontal. it has a velocity of 49 m/s how high will the arrow go? what horizontal distance will the arrow travel? and how long will the arrow be in the air?

*asked on December 17, 2017* -
## Chemistry

Draw the resonance structures for SeS2 and SiS2. There are 2 for SeS2 and 3 for SiS2. I really need help with this. If it can be explain with words, since pictures would be hard. Thanks!

*asked on December 1, 2010* -
## world history

How did movable type help the Chinese to record their knowledge in a permanent form?

*asked on December 5, 2010* -
## algebra

(0.4*10-6)(0.7*10^-2)

*asked on February 27, 2019* -
## Geometry

ABCD is a parallelogram. If AB = 2x - y, CD = 7, BC = x + y , AD = 2 find x and y.

*asked on September 4, 2011* -
## Science

The coinage metals - copper, silver, and gold - are considered to be a chemical family. List three arguments to explain why. Please help!!

*asked on June 1, 2017* -
## Chemistry

An unsealed 750 mL beaker contains 500 mL of very dense gas at 25.0 degrees C and 1.10 atm. The gas is much denser than the surrounding air, so it does not disperse into the air. (a) At constant pressure, what would the temperature have to reach for the

*asked on March 6, 2017* -
## 7th grade math (probability)

I'm re-posting corrections originally from Wednesday in addition to new ones. Still not sure how to answer #4. 2. Edwin rolls a number cube and then spins a color from a color card (red, yellow, blue, green, white). What is the probability that he will

*asked on May 8, 2015* -
## history

Can someone give me links for these please? Describe the military strategy that General William T. Sherman used across Georgia and South Carolina. Explain how the strategy affected the south, as well as how southerners reacted. Explain the purpose of

*asked on May 11, 2016* -
## Chemistry

The heat of neutralization of HCl(aq) and NaOH(aq) is -55.90 kJ/mol of water produced. If 50.00 mL of 1.16 M NaOH at 25.15 ºC is added to 25.00 mL of 1.79 M HCl at 26.34 ºC in a plastic-foam cup calorimeter, what willthe solution temperature be

*asked on November 1, 2015* -
## physics

Anna applies a force of 19.5 newtons to push a book placed on a table. If the normal force of the book is 51.7 newtons, what is the coefficient of kinetic friction? A) .01 B) .20 C) .38 D) .48

*asked on April 7, 2015* -
## physics URGENT! HELP

If an object is thrown in an upward direction from the top of a building 1.60 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground? (Disregard wind resistance. Round answer to nearest whole number and do

*asked on November 7, 2012* -
## Math

The right side of the orchestra section of the Nederlander Theatre in New York City has 19 rows, and the last row has 27 seats. The number of seats in each row increases by 1 as you move toward the back of the section. How many seats are in this section of

*asked on May 14, 2014* -
## Math Personal Finance

A friend tells you that her savings account doubled in 9 years. Use the Rule of 72 to estimate what the APR of her account was.

*asked on June 8, 2014* -
## AP Physics B

A 63.6-kg bungee jumper is standing on a tall platform (h0 = 50.6 m). The bungee cord has an unstrained length of L0 = 9.54 m and, when stretched, behaves like an ideal spring with a spring constant of k = 67.8 N/m. The jumper falls from rest, and it is

*asked on November 29, 2012* -
## 9th grade algebra (completing square)

Can you check the following? A1. (2x + 3)^2 = 25 sqrt(2x + 3)^2 = +-sqrt(25) 2x + 3 = +- 5 2x + 3 = 5, 2x + 3 = -5 2x = 2, 2x = -8 x = 1, x = -4 {-4, 1} A2. x^2 + 14x + 45 = 0 x^2 + 14x + __ = -45 + __ x^2 + 14x + 49 = -45 + 49 (x +7)^2 = 4 sqrt(x+7)^2 =

*asked on November 9, 2016* -
## Math Personal Finance

Assume a 30-month CD purchased for $4000 pays simple interest at an annual rate of 5.5%. How much total interest does it earn? What is the balance at maturity?

*asked on June 8, 2014* -
## Finance ( Need help )

TexMex Food Company is considering a new salsa whose data are shown below. The equipment to be used would be depreciated by the straight-line method over its 3-year life and would have a zero salvage value, and no new working capital would be required.

*asked on July 30, 2009* -
## 7th grade math

Aaron is staying at a hotel that charges $99.95 per night plus tax for a room. A tax of 8% is applied to the room rate, and an additional one-time untaxed fee of $5.00 is charged by the hotel. Which of the following represents Aaron’s total charge, in

*asked on September 8, 2017* -
## 7th grade math

Can you check these? 1. Olivia typed 2 pages in 15 minutes. Write an equation relating the number of minutes m to the number of pages typed. How long will it take her to type 10 pages at this rate? Ans: 15/2 = 7.5 = 7.5 * 10 = 75 minutes 2. If the ratio of

*asked on December 6, 2014* -
## 6th grade grammar

Can you check these sentences? Identify whether each sentence includes an action verb, linking verb, or verb phrase. 1. Celina is coming to my house after dinner. Linking = is verb phrase = is coming 2. The weather was beautiful this past weekend. Linking

*asked on December 11, 2013* -
## Help! - Social Studies

What nationally known company was a direct result of the first Texas oil boom? A) British Petroleum B) Chem-Central C) Chevron D) Texaco

*asked on February 12, 2019* -
## Physics

A magnifier has a magnification of 6x. How far from the lens should an object be held so that its image is at the near point distance of 25 cm? I tried doing the problem by using the equation M = 25cm / f. M = 25 cm/6 = 4.17 cm However when I put the

*asked on February 10, 2015* -
## MATH

BRYCE HAS 24 BASEBALL TROPHES. MATT HAS 3/4 AS MANY TROPHIES AS BRYCE. HOW MANY TROPHIES DOES MATT HAVE?

*asked on March 24, 2013* -
## math

3. -3p > -48 The answer is p < 16 but idk why? 6. Which inequality matches the graph? The graph is -3 -2 -1 0 1 2 3 4 and there is a red line from 1 to -3 The answer is 3x + 1 _< 4 but idk why? 19. Which inequality matches the graph? -3 -2 -1 0 1 2 3 4 and

*asked on December 18, 2015* -
## General Chem

Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced

*asked on October 12, 2012* -
## MATH

ESTIMATION. WHICH IS THE BEST ESTIMATE FOR THE AREA OF A SQUARE WITH SIDES EQUAL TO 4 1/8 INCHES?

*asked on March 24, 2013* -
## Hisyory

How are Aristotle's teachings related to the scientific method used by scientists today?

*asked on May 21, 2016* -
## Geometry

Point C is the center of the circle. Angle ACB measures56 degrees What is the measure of arc AB? How do you work this out?

*asked on September 12, 2011* -
## Personal Finance

Suppose you put in a savings account at an APR of 6% compounded monthly. Fill in the table below rounding your answers to the nearest cent. (Calculate the interest and compound it by hand each month rather than using the compound interest formula.) Month

*asked on June 8, 2014* -
## science

could someone help me

*asked on May 4, 2019* -
## basic english

The gist of the saying went something like this: If a person wants to get ahead in life, you have to be willing to work for it. Which of the following language conventions is violated in the sentence above? Use of a colon Verb tense Pronoun-antecedent

*asked on May 26, 2015* -
## Math Personal Finance

A friend tells you that her savings account doubled in years. Use the Rule of 72 to estimate what the APR of her account was. APR=____%

*asked on June 8, 2014* -
## Algebra

A project can be completed by n workers in t days. If 56 workers need 7 days to finish the project, find the value of k - I found k. K=392 Final step - Hence, express n in terms of t. WHAT DO I DO HERE?

*asked on January 15, 2019* -
## physics

A proposed space station consists of a circular tube that will rotate about its center(like a tubular bicycle tire). The circle formed by the tube has a diameter of 1.1km. What must be the rotation speed(revolutions per day) in an effect nearly equal to

*asked on January 7, 2015* -
## Math

The Table shows some common scales used in a model railroading.For each scale,find the length of a model of an 82-foot long boxcar.Give the length of each model in inches. Scale Name/Scale N 1:160, S 1:64, O 1:48

*asked on March 16, 2011* -
## College Chemistry

Given that delta Hrxn for OH- ions is -229.6 kJ/mol, calculate the enthalpy of neutralization when I mole of a strong monoprotic acid (such as HCl) is titrated by 1 mole of a strong base (such as KOH) at 25-degrees C.

*asked on October 26, 2010* -
## physics

An alpha particle, the nucleus of a helium atom, is at rest at the origin of a Cartesian coordinate system. A proton is moving with a velocity of v towards the alpha particle from the positive x axis direction. If the proton is initially far enough away to

*asked on September 29, 2008* -
## Chemistry Help Please :)

I'm stuck on how to do these 4 problems concerning Chemical Equilibriums. When varsol and iodine/pottasium iodide solutions are mixed, the two phases form.. phase A (top) would be pink and phase B (bottom) would be brown. What are the colours in each

*asked on February 12, 2012* -
## Physics

A 15.0 gram bullet strikes and becomes embedded in a 1.24 kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is 0.280, and the impact drives the block a

*asked on January 5, 2011* -
## math

The region between the graphs of y=x^2 and y=2x is rotated around the line x=2. how do you find the volume of the object?

*asked on September 29, 2008* -
## Calculus 2

A culture of bacteria is growing at the rate of 20e^0.8t cells per day, where t is the number of days since the culture was started. Suppose that the culture began with 50 cells. (a) Find a formula for the total number of cells in the culture after t days.

*asked on September 18, 2016* -
## 7th grade math

1. Evan withdrew a total of $160 from an ATM machine over a 4-day period. He withdrew the same amount of money each day. a. Write an expression to represent the total amount that Evan's account changed each day. Ans: 4d b. What integer represents the total

*asked on March 24, 2015* -
## accounting

The accounting records of NuTronics, Inc., include the following information for the year ended December 31, 2011. Dec. 31 Jan. 1 Inventory of materials $ 24,000 $ 20,000 Inventory of work in process 8,000 12,000 Inventory of finished goods 90,000 80,000

*asked on January 22, 2013* -
## social studies

Read the passage from the apology to the Aborigines issued in 2008 by the Australian government. “Let the parliament reflect for a moment on the following facts: that, between 1910 and 1970, between 10 and 30 per cent of Indigenous children were forcibly

*asked on May 28, 2019* -
## 7th grade math

Can you check my answers please. 1. Joe and his friends at 3/8 of pie. If the pie was cut into 8 pieces, how many pieces are left? Ans: 8/8 - 3/8 = 5/8 pieces left 2. Michaela walked 2/5 miles to the store in 1/4 hour. What's her walking pace? Ans:

*asked on October 7, 2014* -
## Chemistry

in the reaction:Ni+SN4+-->Ni2+ (+)Sn2+ which species has been reduced? 1.Ni 2.Sn4+ 3.Ni2+ 4.Sn2+ i know its def Sn but im not sure which one.

*asked on March 20, 2011* -
## Math

It takes Beth 15 minutes to walk to school, 1/2 mile away. What is her walking pace?

*asked on January 31, 2016* -
## Science

Hurricane Katrina, which hit the Gulf Coast of Louisiana and Mississippi on August 29, 2005, had the second lowest ever recorded barometric pressure at 920mb. Convert this pressure to units of atmospheres, and inches of Hg. 1 bar = 0.98692 atm 0.92 bar =

*asked on September 2, 2015* -
## Calculus

An air traffic controller spots 2 planes at the same altitude converging on a point as they fly at right angles to each other. One plane is 150 miles from the point moving at 450 miles per hour. The other plane is 200 miles from the point moving at 600

*asked on October 25, 2011* -
## Social Studies

I have no idea what to do,if you can give me some tips of ideas I'll be extreamlly grateful. Heres what I need help with. Tell about the hardships of the early colonies and colonists. Pretend you are partiticipating in a town meeting to discuss the

*asked on December 20, 2018* -
## Physics

You are very slowly pushing up an incline with a calculator sitting on it. The coefficient of static friction is 0.7. At what angle θ will the calculator start sliding?

*asked on October 26, 2010* -
## 7th grade LA

Can you check the following? 1. I didn't know what time it was so I was very late to class indep = I didn't know what time it was indep = I was very late to class Ans: compound 2. I'll help you if you help me. indep = I'll help you dep = if you help me

*asked on October 15, 2014* -
## chemistry

A student mixed 75.0 mL of water containing 0.75 mol HCl at 25�C with 75.0 mL of water containing 0.75 mol of NaOH at 25�C in a foam cup calorimeter. The temperature of the resulting solution increased to 35�C. How much heat in kilojoules was

*asked on February 7, 2012* -
## 7th grade math

Can you check these please? 4. A local bakery sold 60 loaves of bread in one day. If 65% of these were sold in the afternoon, how many loaves were sold in the afternoon? Ans: x = .65 * 60 x = 39 loaves 7. Ruben bought 6new books for his collection. This

*asked on January 17, 2015* -
## Math

A photographer wants to print a photograph and two smaller copies on a rectangular sheet of paper. The larger photographer and the smaller photographs are in proportion. The larger photograph has a width of 4 inches and a length of 6 inches. Find the

*asked on January 21, 2019* -
## SS

How did the Radical Republican Reconstruction plan affect life in South Carolina? a) the law did not give African Americans equal protection b) the state regained the right to decide local matters c) white males who participated in the war were permitted

*asked on February 25, 2016*