# elizabeth

Popular questions and responses by elizabeth-
## CHEM

is breaking an egg a chemical or physical change? is cooking an egg a chemical or physical change?

*asked on October 17, 2010* -
## math

When a coin is tossed four times, sixteen equally likely outcomes are possible as shown below: HHHH HHHT HHTH HHTT HTHH HTHT HTTH HTTT THHH THHT THTH THTT TTHH TTHT TTTH TTTT Let X denote the total number of tails obtained in the four tosses. Find the

*asked on December 5, 2009* -
## math

The store employee works 35 hours per week. Which inequality can be used to find the dollar value, x, of weekly sales that the employee must make to earn more than $400 per week?

*asked on March 31, 2017* -
## chemistry

HCN(aq) + SO4-2(aq) HSO4-(aq) + CN -(aq) a. What is the Bronsted - Lowry acid in this equation? b. What is the Bronsted - Lowry base in this equation? c. What is the conjugate acid in this equation? d. What is the conjugate base in this equation?

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

In the adult-school classes held several nights per week, 1/2 of the adults enrolled fall into the 41-60 age group, 1/3 of the remainder are over 60, 14 are in the 30-40 age group, and 12 are under 30. How many adults are enrolled in the school? I did 1/2x

*asked on August 3, 2018* -
## Mathematics

A garrison of 1200 men has sufficient ratios for 25 days at the rate of 2400g per man per day. If 300 man join them and the ratios are reduced to 2000g per man per day,how long will the road last all of them? Thank you :)

*asked on March 13, 2012* -
## Chemestry

If an ion contains 50 protons,68 neutrons and 48 electrons.what is its symbol?

*asked on August 1, 2014* -
## Spanish

I need to make each statement into a question using the interrogative words. Can someone revise the questions Adónde Cuándo Cuántos De dónde Dónde Por qué Qué Quién ¿ Dónde caminan Paco y Rosa? Paco y Rosa caminan a la biblioteca. ¿ De dónde el

*asked on September 22, 2013* -
## Math

A ferris wheel is 30 meters in diameter and boarded in the six o'clock position from a platform that is 10 meters above the ground. The wheel completes one full revolution every 10 minutes. At the initial time t=0 you are in the twelve o'clock

*asked on December 10, 2012* -
## Chemistry

For the following reaction, Kp = 3.5 104 at 1495 K. H2(g) + Br2(g) 2 HBr(g) What is the value of Kp for the following reactions at 1495 K? (a) HBr(g) 1/2 H2(g) + 1/2 Br2(g) (b) 2 HBr(g) H2(g) + Br2(g) (c) 1/2 H2(g) + 1/2 Br2(g) HBr(g)

*asked on February 20, 2012* -
## Math-Ratios

In a college library, there are 4 times as many nonfiction books as fiction books. A.Find the ratio of the number of nonfiction books to the number of fiction books. B.How many times the number of nonfiction books is the number of fiction books? C.Suppose

*asked on January 19, 2017* -
## Calculus

Breathing is cyclic and a full respiratory cycle from the beginning of inhalation to the end of exhalation takes about 5 seconds. The maximum rate of air flow into the lungs is about 0.5 L/s. This explains, in part, why the function

*asked on April 27, 2012* -
## Careers

What job do you qualify if you do these subjects maths lit,geography,history,life science

*asked on July 15, 2019* -
## maths

What is the gradient of a line that has an angle of inclination of 75°? Enter the answer, rounded to 4 significant figures in the box below. the answer should be a number. ???

*asked on May 8, 2011* -
## Math-Trigonometry

Can someone help me with this problem. -A Ferris wheel has a radius of 37.8 feet. The bottom of the Ferris wheel sits 0.7 feet above the ground. You board the Ferris wheel at the 6 o'clock position and rotate counter-clockwise. A)Define a function, f that

*asked on April 30, 2017* -
## English

"Tolerance is the word used most often when this kind of coexistence succeeds, but tolerance is a vanilla-pudding word, standing for little more than the allowance of letting others live unremarked and unmolested. Pride seems excessive, given the American

*asked on September 16, 2015* -
## Ed Tech

Before katie turns in the paper she typed she wants a peer to review it and give her feedback. katie uses her all in one printer to scan her edit,prints, and send them to her friend. An all in oneprinter is -Input device -Output device -Data storage device

*asked on September 10, 2015* -
## Biology

Suppose that the concentration of H+ in Solution #1 is 10,000 times greater than in Solution #2. What can you conclude about the difference in pH of these two solutions?

*asked on September 2, 2019* -
## Science(IPC)

1.00 L of a gas at standard temperature and pressure is compressed to 473 ML. what is the new pressure of the gas?

*asked on December 3, 2013* -
## Physics

(a) Find the electric field at x = 5.00 cm in Figure 18.52(a), given that q = 1.00X10^-6;C . (b) At what position between 3.00 and 8.00 cm is the total electric field the same as that for –2q alone? (c) Can the electric field be zero anywhere between

*asked on August 8, 2016* -
## Introduction to statistics

A researcher would like to estimate the population proportion of adults living in a certain town who have at least a high school education. No information is available about its value. How large a sample size is needed to estimate it to within 0.19 with

*asked on July 17, 2014* -
## Physics

The cheetah is one of the fastest-accelerating animals, because it can go from rest to 18.2 m/s (about 41 mi/h) in 2.7 s. If its mass is 114 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your

*asked on October 20, 2012* -
## math

The box plots below show the average daily temperatures in January and December for a U.S. city: two box plots shown. The top one is labeled January. Minimum at 0, Q1 at 10, median at 12, Q3 at 13, maximum at 16. The bottom box plot is labeled December.

*asked on January 30, 2016* -
## physics...PLZ HELP! =)

A constant force acts on a moving object. The object makes a fixed magnitude of displacement in some direction. In general, in what direction is the displacement that will result in the object traveling with the least kinetic energy after the displacement

*asked on October 16, 2012* -
## Calculus

A metal cylindrical container with an open top is to hold 1 cubic foot. If there is no waste in construction, find the dimensions which will require the least amount of material.

*asked on October 13, 2012* -
## Art

Hi, could someone check this for me, thx :) Why is it harder to find examples of 3D art rather than 2d art in early human history?? A) No early civilizations made 3D art B) 3D art is only part of the digital arts C) People have always perferred 2D art to

*asked on November 7, 2017* -
## Physics

(a) A narrow beam of light containing yellow (580 nm) and green (550 nm) wavelengths goes from polystyrene to air, striking the surface at a 30.0º incident angle. What is the angle between the colors when they emerge? (b) How far would they have to travel

*asked on July 27, 2016* -
## science

Calculate the PRP, PRF, PD, DF, SPL, wavelength, period, and Axial Resolution if a 2 cycle pulse emitted from a 10 MHz transducer if the echo time received was 0.26 ms in soft tissue. Part II - Using the information above: 1. If the PRF decreases what

*asked on November 3, 2014* -
## Chemistry

If 0.2g of a salt is required to saturate 200cm3 of waterat room temperature. what is the solubility of the salt?

*asked on December 16, 2018* -
## Statistics

A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Cavalier shows that the mean is 4.5 hours and the standard deviation is .6 hours. If 42 mechanics are randomly selected, find the probability that their mean rebuild

*asked on July 20, 2015* -
## College Chemistry

A buffer solution contains 0.120M acetic acid and 0.150M sodium acetate. a. How many moles of acetic acid and sodium acetate are present in 50.0 ml of solution? b. if we add 5.55 mL of 0.092M NaOH to the solution in part (a) how many moles of acetic acid ,

*asked on November 10, 2010* -
## Chemistry

We mix 119 grams of oxygen gas with 176 grams of argon in a volume of 520 mL at 116 Celsius. What will be the final pressure of the gas mixture? Answer in units of atm.

*asked on August 5, 2019* -
## Calculus

Find the point on the graph of function that is closest to the point. f(x)=x^2 (2,1/2)

*asked on July 18, 2012* -
## statistics

A production process produces an item, On average, 13% of all items produced are defective. Each item is inspected before being shipped, and the inspector misclassifies an item 12% of the time. What proportion of the items will be "classified as good"? I

*asked on February 17, 2020* -
## Chemisty

A 25-mL sample of 0.160M solution of NaOH is titrated with 17 mL of an unknown solution of H2SO4. What is the molarity of the sulfuric acid solution? A. 0.004M H2SO4 B. 0.235M H2SO4 C. 0.117M H2SO4 D. 0.002M H2SO4

*asked on February 18, 2014* -
## Physics

A 15.0-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 5.00 m/s in 0.460 s. In

*asked on November 30, 2012* -
## art 101

According to the author, a. the interpretation of a work of art is objective. b. a work of art may fall into more than one theme. c. it doesn’t make sense to compare art from different cultures. d. all of these are the case: the interpretation of art is

*asked on October 5, 2012* -
## physics

A 10g marble is spun so that it rolls at 150rpm around the inside of a steel tube. The tube has a 12cm diameter. Assume the rolling resistance is small enough for the marble to maintain 150rpm for several seconds. During this time, will the marble spin in

*asked on November 15, 2009* -
## algebra

the area of a pizza is 220 square centimeters. what is the radius

*asked on January 7, 2009* -
## Biology

Uracil pairs with(1 point) A. any nitrogen base. B. thymine. C. adenine. D. uracil. i think its A.

*asked on August 9, 2020* -
## Physics

1. A 3kg box is released from the top of a 20° inclined plane. If the length of the inclined plane is 10m long, and a frictional force of 10N opposes the motion of the ball, Determine the speed of the ball when the ball reaches the bottom of the plane.

*asked on June 24, 2020* -
## Algebra

Which statement about a right triangle is NOT true? A.) The hypotenuse is the longest side of the triangle. B.) The square of the hypotenuse is equal to the sum of the squares of the other two lengths. C.) The sum of the length of the two legs is equal to

*asked on February 10, 2020* -
## physics

What is the distance the lower spring is extended from its unstretched length? three masses (m1 = 3.1 kg, m2 = 9.3 kg and m3 = 6.2) hang from three identical springs in a motionless elevator. The springs all have the same spring constant given above. Now

*asked on October 13, 2018* -
## Calculus

A point moves along the curve y= x^3 -3x + 5 so that x= 1/2 square root t + 3 where t is the time. At what rate is y changing when t = 4? Need some help!!!

*asked on February 12, 2017* -
## math

A set of data items is normally distributed with a mean of 70. Convert the data item to a z-score, if the standard deviation is as given. data item: 80; standard deviation: 15

*asked on April 17, 2016* -
## Math

Every two-digit number whose units digit is three times its tens digits

*asked on December 23, 2015* -
## Language Arts

Read the following topic. How could you rewrite the topic to form a focused thesis statement? *Tablets and School* -Schools use tablets daily -The of tablets positively affects students achievement in school

*asked on May 22, 2015* -
## Math

A motorist makes a journey of 240 km from Singapore to Malacca to visit his inlaws at an average speed of x kilometers. On his return journey, his average speed is reduced by 6km/hour due to traffic. If the return journey takes 20 minutes longer, form an

*asked on December 10, 2012* -
## Chemistry

For the reaction below at a certain temperature, it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2] = 0.0500 M, [F2] = 0.0100 M, and [HF] = 0.400 M. If 0.340 mol of F2 is added to this equilibrium mixture, calculate the

*asked on February 20, 2012* -
## Chemistry

Write a balanced chemical equation for nitrogen gas reacts with oxygen gas to produce nitrogen dioxide gas

*asked on March 29, 2010* -
## Math

15 movie theaters average 600 customers per theater per day. If 6 of the theaters close down but the total theater attendance stays the same, what is the average daily attendance per theater among the remaining theaters? A. 750 B. 1000 C. 1200 D. 1500

*asked on July 27, 2018* -
## math

Suppose you have a wallet with $5 bills, $10 bills, and $20 bills. If the probability of picking a $20 bill is 4/15, and the probability of piciing a $5 bill is 1/3, what is the probability of picking a $20 bill? a. 1/15 b. 1/5 c. 4/15 d. 2/5 **

*asked on May 19, 2016* -
## Geography

Whereas reapportionment adjusts the amount of political representation give to a certain geographical area, redistricting adjusts A) country, state and/or county boundaries. B) population size. C) the gerrymander. D) Federal lands. E) the geographical

*asked on March 26, 2016* -
## Biology

What is the difference between tolerance range and optimum range in Biology?

*asked on January 27, 2016* -
## Statistics

The Tyco Video Game Corporation finds that it is losing income because of slugs used in its video games. The machines must be adjusted to accept coins only if they fall within set limits. In order to set those limits, the mean wight of quarters in

*asked on July 20, 2015* -
## Health

the heart is composed of how many loops

*asked on January 13, 2015* -
## AP Chemistry

At 298K and 1 atm, a 0.5 mol sample of O2 and a separate 0.75 mol sample of CO2 gas have the same: A. mass B. density C. average molecular speed D. average molecular kinetic energy E. number of atoms Please explain, and thanks for helping!

*asked on November 6, 2013* -
## Math

" kelly has twelve cards numbered 1 to 12. what is the probability of picking three even-numbered cards consecutively, if the first two cards are not replaced?

*asked on November 1, 2013* -
## computers

Which of the following html tags would you use after a table? A. B. C. D. i say b.

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

A compressed gas cylinder contains 1.00 103 g of argon gas. The pressure inside the cylinder is 2096 psi (pounds per square inch) at a temperature of 19°C. How much gas remains in the cylinder if the pressure is decreased to 656 psi at a temperature of

*asked on February 9, 2012* -
## calculus

solve the differential equation. assume a, b and k are non zero constants. dR/dt = kR i don't understand how to do these problems.

*asked on December 7, 2008* -
## science

Assume that the batteries in the flashlight are rechargeable. What energy conversion would have to take place in order to recharge the batteries? is it electrical to chemical energy?

*asked on January 21, 2020* -
## social studies

Why did the rise of nation-states have an impact upon exploration beyond Western Europe?

*asked on June 28, 2019* -
## biology

North American wolves can have gray fur or black fur. A single gene with two alleles codes for fur color. Information about the fur color of parents and offspring in four wolf families is shown below. Family 1 | gray fur x black fur | 3 gray fur : 2 black

*asked on January 2, 2019* -
## Math

Victoria has a 2-pound package of flour. She uses 2/5 of the flour to make bread. Find the weight of the package of flour that she has left. Express your answer as a decimal.

*asked on December 21, 2016* -
## Math

Jason received an invoice for $5,000, and the invoice was dated on August 26 with terms of 2/10, n/45 EOM. Please answer the following questions: (1) How much did Jason owe if the bill is paid by September 26? (2) When will be the last day that Jason can

*asked on September 15, 2016* -
## Physics

A child throws a small ball vertically upwards. The ball is caught at the initial height 1.8 seconds after being thrown. What was the net displacement for the ball? What was the initial speed of the ball? What was the final speed of the ball? How high did

*asked on September 3, 2016* -
## chemistry

A gas has a density of 5.56 g/L. a. What volume in milliliters would 4.17 g of this gas occupy? b. What would be the mass in kilograms of 1 m3 of this gas?

*asked on September 11, 2013* -
## Physics

The power radiated by the sun is 3.90 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.50 1011 m. The earth's axis of rotation is tilted by 27° relative to the plane of the orbit (see the drawing), so sunlight does not strike the

*asked on March 26, 2013* -
## Chemistry

A 43.0 g sample of hydrated cobalt (II) sulfite is heated to drive off the water. The anhydrous cobalt (II) sulfite has a mass of 26.1 g. Calculate the mass of water. Calculate the moles of water. Calculate the moles of cobalt (II) sulfite. Calculate the

*asked on October 26, 2012* -
## Chemistry

In the presence of an acid catalyst, salicylic acid reacts with methanol to produce oil of wintergreen and water. If water is added to the solution, a precipitate is formed. Identify the precipitate and explain why it is formed. Don't understand...!

*asked on June 2, 2012* -
## physics

A 3.00x10^-3 kg lead bullet enters a target with a speed of 2.00x10^2 m/s and comes to rest within the target. Calculate the rise in temperature of the bullet assuming that 80.0% of the heat produced is absorbed by the bullet. The Specific heat of lead is

*asked on March 25, 2012* -
## chemistry

a 500ml sample of oxygen gas at 24 degree celsius was prepared by decomposing a 3% aqueous soution of hydrogen peroxide in the presence of manganese catalyst by the reaction: 2h2o2 = 2 h20 + o2... the oxygen was colletec by displacement of water. the total

*asked on July 10, 2011* -
## English

Huck struggles to decide what he should do when his heart and his conscience pull him in different directions. He eventually decides to go with his heart. * Write a short essay explaining why you agree or disagree that this was a good strategy for Huck to

*asked on April 7, 2011* -
## physics

As a science project, you drop a watermelon off the top of the Empire State Building, 320 m above the sidewalk. It so happens that Superman flies by at the instant you release the watermelon. Superman is headed straight down with a speed of 36.0 m/s. How

*asked on July 25, 2008* -
## math

In a survey conducted by Helena, a financial consultant, it was revealed of her 400 clients 273 own stocks. 185 own bonds. 169 own mutual funds. 106 own both stocks and bonds. 101 own both stocks and mutual funds. 96 own both bonds and mutual funds. How

*asked on February 29, 2020* -
## math

You received a $100 gift certificate to a clothing store. The store sells t-shirts for $15 and dress shirts for $22. You want to spend no more than the amount of the gift certificate. You want to leave at most $10 of the gift certificate unspent. You need

*asked on December 4, 2018* -
## Writing

Sentence 6: Just choosing among handsaws circular saws jigsaws and saver saws can be bewildering. 1- handsaws circular saws jigsaws and saver saws 2- handsaws circular saws jigsaws, and saber saws. 3- handsaws, circular saws, jigsaws, and saber saws. 4-

*asked on March 21, 2017* -
## math

Shopping: Tax Situation: You are purchasing four items and want to calculate the tax. The items cost $2.50, $8.75, $3.00, and $10.25. The tax rate is 6%. How much is the tax? Calculation With Distribution (Show all steps.) Calculation Without Distribution

*asked on November 18, 2016* -
## Algebra

A team won 6 out 8 games played this season? What percent of games did they win? 6 divided by 8= 0.75, but 75% is the wrong answer. What is the correct answer?

*asked on October 28, 2016* -
## Physics

When an object is moving in a circle, but it is not held to the center by a tangible connection like a string, what provides the centripetal force? 1) some force such as friction or gravity. 2) the tendency for the object to move in a straight line. 3)

*asked on October 2, 2016* -
## Algebra

1)More than 450 students went on a field trip. Ten buses were filled and 5 more students traveled in a car. a) Write an inequality to represent the situation. Be sure to define your variable. b) Solve the inequality to find the minimum number of people on

*asked on September 17, 2016* -
## Physics

Your ear is capable of differentiating sounds that arrive at the ear just 1.00 ms apart. What is the minimum distance between two speakers that produce sounds that arrive at noticeably different times on a day when the speed of sound is 340 m/s?

*asked on July 20, 2016* -
## Biology

Define and give examples of predation, competition, and symbiosis.

*asked on January 27, 2016* -
## Math. Please help

Emory tosses a nickle four times. The probability that he gets at least as many heads as tails is? Explain

*asked on November 2, 2013* -
## PLEASE HELP!! PHYSICS

A 0.63-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.13 to 0.22 m (relative to its unstrained length), the speed of the sphere decreases from 5.95 to 4.75 m/s. What is the spring constant of the spring? (The

*asked on December 1, 2012* -
## Physics

A tow truck is pulling a car out of a ditch by means of a steel cable that is 9.3 m long and has a radius of 0.50 cm. When the car just begins to move, the tension in the cable is 1070 N. How much has the cable stretched? Answer in m

*asked on November 30, 2012* -
## Physics

Workers have loaded a delivery truck in such a way that its center of gravity is only slightly forward of the rear axle, as shown in the drawing. The mass of the truck and its contents is 8340 kg. Find the magnitudes of the forces exerted by the ground on

*asked on November 15, 2012* -
## Physics

Bicyclists in the Tour de France do enormous amounts of work during a race. For example, the average power per kilogram generated by seven-time-winner Lance Armstrong (m = 75.0 kg) is 6.50 W per kilogram of his body mass. (a) How much work does he do

*asked on October 20, 2012* -
## economics

people are more likely to vote....when?

*asked on July 8, 2012* -
## Chemisrty

How many grams of lithium metal would be produced if 0.500g of magnesium was added to a solution of lithium chloride?

*asked on May 5, 2012* -
## calculus

In a certain city the temperature (in degrees Fahrenheit) t hours after 9 a.m. was approximated by the function T(t) = 50 + 14sin((pi*t)/12). Find the average temperature (in degrees Fahrenheit) during the period from 9 a.m. to 9 p.m. I got

*asked on April 27, 2012* -
## Child Development

Dean associates certain activies, roles, and traits as being typical for either males or females. His associations conform to cultural stereotypes and encompass many gender-linked responses. This is an example of gender A.Atypicality B.roles C.typing

*asked on April 23, 2012* -
## Chemistry

The equilibrium constant Kp for the reaction below at 700°C is 0.76 atm. CCl4(g) C(s) + 2 Cl2(g) Determine the initial pressure of carbon tetrachloride that will produce a total equilibrium pressure of 1.20 atm at 700°C

*asked on February 20, 2012* -
## Chemistry

A piece of solid carbon dioxide, with a mass of 6.8 g, is placed in a 4.0 L otherwise empty container at 23°C. a) What is the pressure in the container after all the carbon dioxide vaporizes? b)If 6.8 g solid carbon dioxide were placed in the same

*asked on February 9, 2012* -
## Chemistry

A piece of solid carbon dioxide, with a mass of 6.8 g, is placed in a 4.0 L otherwise empty container at 23°C. a) What is the pressure in the container after all the carbon dioxide vaporizes? b)If 6.8 g solid carbon dioxide were placed in the same

*asked on February 9, 2012* -
## algebra 2b

Determine in which direction the parabola opens y equals x2-7x plus 18?

*asked on May 24, 2010* -
## Algebra

(5c-9)(5c+1)

*asked on April 18, 2010* -
## help with algebra

(p-7)(p+8)

*asked on April 18, 2010* -
## Chemistry

The vapor pressure of CCl3F at 300 K is 856 torr. If 11.5 g of CCl3F is enclosed in a 1.0 L container, will any liquid be present? If so, what mass of liquid?

*asked on February 19, 2010*