# Posts by Emily

Total # Posts: 2,982

**Chemistry AP**

(Oh yeah, sorry about the sign, and I forgot a bracket after that perentices, I meant to say "what are the temperatures in Kelvin?".) I'm sorry for my slowness, I'm actually learning from the textbook without any teacher guidance, so I can't ask a teacher...

**Chemistry AP**

Oh and sorry, 10.12 mL or 10.12 cm^3

**Chemistry AP**

Yes. I understand the degree difference that they are asking for, but I'm having trouble with calculations. They give me the numbers 200.0 F and -100.0F and when I convert those to celcius, I think the significant numbers for each answer should have 4 significant answers. ...

**Chemistry AP**

Also it would be nice to see multiple ways, so do you think you could show me the other way in which the problem asks for the use of mass perecent of copper= (mass of copper/total) x100?

**Chemistry AP**

I don't quite understand why you multiplied 10.501 (density of silver) by (1-x). And what was the point of the problem talking about "assume that the volume of silver present plus the volume of copper.."? Thanks for your help Steve

**Chemistry AP**

I'm using Zumdahl 7th Edition Chemistry Book and I'm having trouble with some practice problems in the first chapter. Here are a few: 87: Sterling silver is a solid solution of silver and copper. If a piece of a sterling silver necklace has a mass of 105.0 g and a ...

**Math**

If 1 more than a certain number is 3 less than a second number, the larger of these numbers minus the smaller is equal to?

**Math**

Oatmeal Recipe: Water 3/4 cup Salt: 1/4 teaspoon Oats: 1/3 cup If the least possible multiple of the recipe above is prepared so that a whole number of cups of both water and oats are used, how many teaspoons of salt would be required?

**Math Gr 11**

"A rock is dropped from the edge of a 180 m cliff. the function f(x) = -5t^2 - 5t + 180 gives the height of the rock, h(t), in meters t seconds after it was released. How long does it take for the rock to reach a ledge 80 m above the base of the cliff?" I have no ...

**Math Helping**

They need 2 cup of flour.How many 1/4cups should they measure

**Math**

an algorithm word problem

**geometry**

450 cm3

**first additional language**

how did youth day came?

**math**

168

**math**

what is the rule of the input output table input 2 output 11 input 3 output 15 input 5 output 18 input 8 output? what is the rule?

**C/Justice**

it could be B.

**C/Justice**

The inmate code is: A. the set of rules for inmate behavior established by prison officials. B. an informal set of rules of inmate behavior that is part of the prison culture. C. a secret language inmates use to communicate with each other in the presence of guards or other ...

**C/J**

The role of the defense attorney is to: A. decide the innocence of the accused. B. get his or her client off by whatever means. C. give the client every resource available to defend himself or herself within the limits of ethics and law. D. act as a legal technician to get his...

**life orientation**

5 ways in which the human or environmental problem impact on the community on Hiv&aids

**help please**

Although its meaning may vary from one culture to the next, __________ appears to be an almost universal taboo. A. murder B. rape C. theft D. incest D am i correct?

**Physics 1**

A steel wire in a piano has a length of 0.5000 m and a mass of 3.800 10-3 kg. To what tension must this wire be stretched in order that the fundamental vibration correspond to middle C (fC = 261.6 Hz on the chromatic musical scale)?

**Health**

10/10 100% Correct

**calculus**

Find the derivative y = e^(-5x) + cos^3 x F(x)= (x^2 -x+1)^3

**math**

20

**Chemistry**

A sample of argon gas at STP occupies 56.2 liters. Find the number of moles of argon and the mass in the sample

**Math**

How do you find the equation of a line with a slope of 2 and containing the points 1,5

**math**

An alcohol solution consists of 6 gallons of pure water and x gallons of alcohol, x > 0. Let f(x) be the ratio of the volume of alcohol to the total volume of liquid. [Note that f(x) is the concentration of the alcohol in the solution.] (a) Find a possible formula for f(x).

**landmark project**

thank you but can you help me think of 3 questions for palace of fine arts

**landmark project**

I am not impatient

**landmark project**

please

**landmark project**

i really need help

**landmark project**

did any workers die while building the palace of fine arts

**landmark project**

did any workers die while building the palace of fine

**math**

An alcohol solution consists of 6 gallons of pure water and x gallons of alcohol, x > 0. Let f(x) be the ratio of the volume of alcohol to the total volume of liquid. [Note that f(x) is the concentration of the alcohol in the solution.] (a) Find a possible formula for f(x).

**Math**

The invested in a bank savings accouint is coumpounded continousl, with an annual interest rate of 3%. If a deposit of $2000 is made, then determine the balance after 2 years

**To poop**

It's 14

**physics**

Two speakers are wired to emit identical sounds in unison. The wavelength in air of the sounds is 6 m. Do the sounds interfere constructively or destructively at a point 10 m from both speakers? 1. Destructively 2. Neither 3. Constructively

**General Chemistry**

"How would you prepare 150. mL of 0.1M sodium hydroxide given a stock solution of 3.0M NaOH?" I made calculations and figured the process would be to dilute 5 mL of the 3.0M NaOH to 150. mL. Is this correct? For the ideal 150. mL of 0.1M NaOH, I calculated there to ...

**math**

Take an 17 by 11-inch piece of paper and cut out four equal squares from the corners. Fold up the sides to create an open box. Find the dimensions of the box that has maximum volume. (Enter your answers as a comma-separated list. Round your answer to three decimal places.)

**Calculus**

A University of Rochester student decided to depart from Earth after his graduation to find work on Mars. Before building a shuttle, he conducted careful calculations. A model for the velocity of the shuttle, from liftoff at t = 0 s until the solid rocket boosters were ...

**Physics**

A convex lens of focal length 2.5 cm is placed 4 cm from a small object of height 4 cm. Use a ruler and construct the image. Is the image real or virtual, upright or inverted? What is the image distance? What is the height of the image? What is the magnification?

**landmarks**

none of those tell me who named palace of fine arts

**landmarks**

ther are so many websites , i do not know which website do you want me to read about

**landmarks**

i don't get it

**landmarks**

how did Palace Of Fine Arts got its name

**Find the avg rate**

Find the average rate of change f(x)=x^3-3x+9 (a) from -4 to -3 (b) from -2 to 5 (c) from 5 to 9

**Algebra**

For the given equation, list the intercepts and test for symmetry. 2+y-121=0 Show tests algebraically

**math**

he should be puling with 66 pounds of force

**Please Help! Rate of change...**

Taxes: Along with incomes, peoples charitable contributions have steadily increased over the past few years. The table shows the average deduction for charitable contributions reported on individual income tax returns for the period 2007 to 2012. Find the average rate of ...

**Math**

Mack needs to buy fencing to surround his circular garden. If his garden is 30 feet across and fencing cost $4.50 per foot, how much will it cost to fence in Mark's garden? If the radius if of a circle is 4 feet, what is its circumference ? Ben ran 10 times around a ...

**Find the rate of change**

Taxes: Along with incomes, peoples charitable contributions have steadily increased over the past few years. The table shows the average deduction for charitable contributions reported on individual income tax returns for the period 2007 to 2012. Find the average rate of ...

**4th grade math**

???????????????HELP ME

**Math**

A meteoroid changed velocity from 1.0 km/s to 1.8 km/s in 0.03 seconds. What is the acceleration of the meteoroid?

**Science**

In 0.5 seconds, a projectile goes from 0 to 300m/s. what is the acceleration of the projectile?

**Algebra 1**

Solve for y=x-5

**math**

Let 2^a = 5 and 2^b = 7. Using exponent rules, solve the equation in terms of a and b. 0.4^x = 343

**Math**

Thanks!

**Math**

What is 8/9 as a percent, as a decimal, and a decimal rounded to two places?

**Physics**

no its still just wrong

**Physics**

That is wrong

**Physics**

A rotating uniform-density disk of radius 0.6 m is mounted in the vertical plane. The axle is held up by supports that are not shown, and the disk is free to rotate on the nearly frictionless axle. The disk has mass 5.8 kg. A lump of clay with mass 0.5 kg falls and sticks to ...

**Physics**

11-098-satellite_and_junk.jpg A spherical satellite of radius 4.6 m and mass M = 195 kg is originally moving with velocity vsatellite,i = < 3000, 0, 0 > m/s, and is originally rotating with an angular speed ?1 = 2 radians/second, in the direction shown in the diagram. A ...

**Physics**

A device consists of eight balls each of mass 0.4 kg attached to the ends of low-mass spokes of length 1.8 m, so the radius of rotation of the balls is 0.9 m. The device is mounted in the vertical plane. The axle is held up by supports that are not shown, and the wheel is ...

**CHEM QUICK HELP**

Which of the following are correct statements? (Could be as many as 4) 1. Standard pressure is 101.3 atmospheres 2. One mole of gas contains 22.4 representative particles 3. One mole of gas always occupies 22.4 liters regardless of other conditions 4. Solids can always be ...

**math**

Thank you!

**math**

Dad baked a batch of cookies. My brother ate half my mom ate a fourth of the batch. Dad ate 3 and I ate the last two. How many cookie did dad bake? PLEASE help me figure this problem out?

**math**

A population of animals oscillates between a low of 1098 on January 1 (t = 0) and a high of 2344 on July 1 (t = 6). (a) Find a formula for the population, P, in terms of the time, t, in months.

**Physics**

A car has a unibody-type frame and is supported by four suspension springs, each with a force constant of 36100 N/m. The combined mass of the car’s frame and everything inside it (the engine, the seats, the passengers, etc.) is 1270 kg. Because of worn-out shockabsorbers...

**Physics**

A particle hangs from a spring and oscillates with a period of 0.2 s.If the mass-spring system remained at rest, by how much would the mass stretch it from its normal equilibrium position? The acceleration of gravity is 9.8 m/s^2

**Physics**

A mass of 0.22 kg is attached to a spring and is set into vibration with a period of 0.10 s. What is the spring constant of the spring? Answer in units of N/m

**General Chemistry**

What volume of 1.0 M HCl would react completely with 0.20 grams of NaC2H3O2*3H2O? It sounds like an equation I would set up as this and would use mole ratios to calculate the answer: HCl + NaC2H3O2*3H2O --> But I am confused as to what I would put as the products, let alone...

**Math**

A C D A B

**Chmeistry**

Estimate the uncertainty in the speed of an oxygen molecule if its position is known to be +/- 3 nm. The mass of an oxygen molecule is 5.31 x 10^26 kg.

**General Chemistry**

Balance the following redox reaction in acidic and basic solutions: Fe(OH)2(s) + O2(g) --> Fe(OH)3(s) These are the steps my instructor gave us to balance redox reactions: 1. Divide into 1/2 rxns (reduction & oxidation) 2. Balance atoms other than H & O 3. Balance O with ...

**Physics 1**

A coin rests 12.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface is 0.350. The turntable starts from rest at t = 0 and rotates with a constant angular acceleration of 0.749 rad/s2. After what period of time will the...

**language arts**

it is a spring break pratice book

**language arts**

but i need help i am only in third grade

**language arts**

true or false. 1. it is easy to walk across something impassable. 2. ice sheets floating on water are called floes. 3. land that is barren has many plants and animals. 4. a crevasse is a deep crack.

**english**

Special education services for young children are with disabilities a. cannot be enforced through laws b. depend on parent efforts c. do not involve the head Start program d. are rooted in federal legislation My answer is d.

**math**

You are at the music store to buy some CDs. You have $45 to spend and the store sells CDs for 12.99 each. Write an inequality that represents the number, n, of CDs that you can buy without spending more money than you have. help greatly appreciated thk

**geography**

The OB river flows through which region a. Central Asia b. Siberia c. Moldova d. Ukraine a or b not sure I think B is more correct am i right?

**Science**

Calculate the quantity of energy required to change 3.00 mol of liquid water to steam at 100°C. The molar heat of vaporization of water is 40.6 kj/mol

**Biology { PLEASE HELP :D }**

From an ATP production viewpoint, use fact B to make a statement regarding the efficiency of fats vs. carbs. Fact b - Carbs bind and store water. The metabolism of water yields no ATP. Fat has no water bound to it.

**organic chemistry**

Did a grignard experiment where we were supposed to form triphenylmethanol but something went wrong. When we heated up the mixture with the petroleum ether, it didn't solidify, it turned dark and oily. What went wrong?

**organic chem**

I prepared triphenylmethanol by a grignard reaction. At the end you add petroleum ether to the mixture and heat it up. It stayed a liquid and got dark and oily but never solidified. What went wrong?

**Stats**

Is noise present in the differenced series (taking non-stationary data and making it stationary through first difference of a time series)?

**language arts**

thank you

**language arts**

what is the past tense of go

**language arts**

i get it now

**language arts**

i do not get it

**language arts**

what is the exact verb of swam

**Curriculum dev**

Behavior objectives should be written about a behavior that a) is exhibited by most chlldren. B) can actually be seen. C) exhibits all five selves. D) can be evaluated using standardized test. I think a) is exhibited by most children. CAn someone give me some feedback

**Math**

Find the difference between the perimeter of a square of area 1 centimeter square and the circumference of a circle of the same area.

**Math**

A lorry travels at 50km/h. Given that the diameter of its wheel is 88cm, find how many revolutions per minute the wheel is turning. Given your answer to the nearest whole number.

**Math**

Find the speed of a point on the rim of a 24cm diameter fly wheel which is turning at 2800 revolutions per minute. Give your answer in meters per second.

**Math**

If the minute hand of a big clock is 1.12m long, find the rate at which its tip is moving in centimeters per minute.

**Math**

As many 8cm diameter discs as possible are cut from a sheet of rectangular cardboard measuring 170cm by 90cm. Find the area of the sheet that is left.

**Algebra**

You are right on!

**Physics**

That is why I'm asking. If u don't know, then don't answer my question

**Physics**

How can we find the resultant force if the mass and SPEED are given?? Give me the formula please!!