# Posts by michele

Total # Posts: 395

**Chemistry **

1-1H + 3-1 H yield 4-2 He What is energy in Kj per mole?

**Chemistry**

Thank you for your help

**Chemistry**

A) K=.693/55sec =1.26xE-2 N=e^-3.73*1E-6 N=2.28E-8 %=N/No*100=2.28% B) Nt=1E-6* e ^(-(.693/55)*3600 sec) = 1.984E-26/1E-6*100 %. 2E-18% Very small number!! I've done it 3 times?

**Chemistry **

A 1.00x10-6g sample of nobelium- 254, has a half-life of 55 seconds after it is formed. What is the percentage of nobelium-254 remaining at the following times? (a) 5.0 min after it forms (b) 1.0 h after it forms

**Chemistry **

Lithium 7 decays losing one alpha particle what is left? 7H 1

**Chemistry**

I think it's a crappy question, a and b section of introduction question all talk about teaspoons of sucrose and calories associated. That leads one to believe we are dealing with nutritional Calorie = 1000 calories right? I don't think it's a heat of vaporization ...

**Chemistry**

It's a can of coke problem.... 355 ml of water (assume coke=water)140 Cal in the can. Using energy from sugar in can. What final temp would be reached if initial was 25 deg C. ?

**Chemistry**

It's 140 Kcal. I got Tf 419.4 deg C. This seemed very high and I can't figure out error

**Chemistry **

140 Cal to heat 355 gm of water with initial temperature of 25 degree celsius, final temp?

**Chemistry**

I did it right thank you for confirmation!

**Chemistry **

CuS is oxidized by molecular oxygen to produce gaseous sulfur trioxide and solid copper (II) oxide. Write 2 balanced half reactions

**Physics**

Ok, my Physics professor gave us this to do uncertainty propagation with these equations. Can some please show me some examples on each of these so I know I'm doing them right? Uncertainty Propagation Since raw data includes uncertainty, all calculations include ...

**Math**

If 1/3 of a gallon of paint covered 3/5 of the room I was painting, how much paint (gallons) would it take to cover the entire room?

**Math**

The scale of a map is 1/8 inch = 10 miles, If 2 cities are 3 inches apart on the map, how many miles are they from each other ?

**Math**

A 500 ml bag of penicillin G contains 250,000 uniys. The patient received 300ml. How many units of penicillin G did the patient receive?

**Chemistry**

At 25 degree celsius, which balloon has the greater volume, an oxygen balloon O2 at 1.2 atm with a mass of 16.0 g, or helium He balloon at 1.2 atm with a mass of 2.0 g?

**Add math**

P(x,y) moves such that its distance from point Q(4,8)is twiceits distance from point P(-2,3). Find the equation of the locus of moving point P.

**Add math**

The mean of a set of numbers 1,y,1,2y+2,13 and 16 is 9. Find the value of y and the variance.

**Add math**

George has planted several types of vegetables for his own consumption on an empty rectangular plot of land beside his house. He wants to fence the land as a dimension of (12x)m and (4-x)m. Find the length, in m of the fence he has to buy when the area of the land is maximum.

**Add Math(rate of change)**

The volume of a cylinder increases at a rate of 324cm cube per second. The height, h cm of the cylinder is twice the radius, r cm. Find the rate of change in radius when the radius is 6cm.(use 3over2 pai)

**science**

You need to make a 2 fold serial dilution starting at 1:100 and ending at 1:3200. You need 2 ml in each test tube when you are finished. You have 40 microliters of serum. do you have enough?

**English**

Identify the main conflict from "the fall from the house of usher " and show what it reveals about the story's protagonist . I have studied this story and I'm not able to find one main conflict, I have found a couple but none add up to the point of what it ...

**math**

yesterday, lena had 55 baseball cards. Today she gave c away. using c write an expression for the number of cards lena has left.

**Math**

Round 5,156 to the nearest ten.

**math**

grant needs 2/3 cup of raisins and 3/4 cups of almonds to make trail mix. which statement can be used to find out if there are more raisins or almonds in the mix?

**Chemistry**

I am trying to determine the net ionic equation for Fe(NO3) and K3 PO4, can you help, I'm having a difficult time?

**Pre-Algebra Calculus**

NEED HELP PLEASE Mixture Problems 1.Joe created a metal containing 40% platinum by combining two other metals. One of these other metals weighed 12 lb. and contained 45% platinum. If the other weighed 3 lb. then what percent of it was platinum? 2. 12 gal. of a saline solution ...

**chemistry**

if i have a 21% solution of a product, and i need to make it a 9% solution of the same product what do i do? i am trying to dilute a product that is 21% to a 9% soultion so it can safety be used on cats. i know what to dilute it with, but i do not know how much or the math to ...

**Math**

The total number of pears eaten by Pete and two of his friends, Tweet and Honk, (during this visit to the pear tree) were in the ratio of 2 : 3 : 5 respectively. If Pete ate 12 less pears than Honk, how many pears did Tweet eat during this time?

**Maths**

Thank you, Ms. Sue

**Maths**

Sorry, I am very stupid here - - what is the * used for?

**Maths**

What is the daily interest rate for the following amount: $598 for 186 days at 7.75% APR

**Trig**

Use the FOIL method. Make sure that you write each more complex function in their sin/cos components. You should be able to cancel a lot and wind up with only sin theta plus cos theta.

**Precalculus Trig (Geometry)**

A rectangular doorway is 38 meters wide and 60 meters high. The doorway is capped with a semi-ellipse that is 13 meters high at its center. Find the height h of the doorway and window 5 meters from the center. From the ellipse equation, I can see that a should be 19 and b ...

**Precalculus Trig (Geometry)**

A large doorway has the shape of a parabolic arch. The doorway is 20 feet high at the top of the arch and 20 feet wide at the base. At a height of 10 feet above the floor, find the width of the arch. If you start the vertex of the parabola at 0,0, that means the equation ...

**algebra**

Make the following model: 40000-400x < 25000 Plug in some numbers for x.

**algebra**

A penny has a 1 cm radius. What is its diameter? Its circumference? its area?

**math**

(2,−2);{y<x−3 y>−x+1

**MATH**

SHELDON CAN RUN A MILE IN 6 4/5 MINUTES, HOW MANY MILES CAN HE RUN IN 30 MINUTES.

**Science**

16,8,4,2

**math**

The ratio of red jelly beans to yellow jelly beans in a dish is 3.4. If Greg eats 3 red ones and 6 yellow ones, the ratio is 4.5. How many yellow jelly beans were originally in the dish? Do you make 3.4 a fraction and 4.5 a fraction and times them? 3/6 TIMES 4.5 = 12/20 THEN ...

**Algebra**

A bag has 2x+1 red marbles, 3x blue marbles, and x+2 green marbles. What is the probability of picking a red marble?

**Algebra**

Compound inequalities 4x+7<11 or 1-x<=-2

**Algebra**

sorry I wrote it wrong it is 4x+7<11 or 1-x<=-2

**Algebra**

4x7<11 or 1-x<=-2 compound inequalities

**Algebra**

compound inequalities -10<-2+8x<22

**algebra**

2b-2/2b^2-8 (find domain to rational expression)

**Algebra**

Using the ac method factor the trimonials. 15x^2 + 31x+2=

**Algebra**

Using the ac method factor the trimonials. 15x^2 + 31x+2=

**Fin/571**

3. Bell Mountain Vineyards is considering updating its current manual accounting system with a high-end electronic system. While the new accounting system would save the company money, the cost of the system continues to decline. The Bell Mountain’s opportunity cost of ...

**math**

I need a prime and composite factor chart. Can you help me?

**zeros in the quotient**

explain why estimating before you divide 624 divide 6 helps you place the first digit in the quotient.

**Chem**

Ka1 = 4.5E-7 and Ka2 = 4.7E-11 for the carbonate system. Ksp is 5.0E-9 and Kw =1.0E-14. A town’s groundwater has [Ca2+] = 37 mg/L, alkalinity of 1.36E-3eq/L and pH of 8. This is to be mixed with surface water with [Ca2+] = 4mg/L, alkalinity of 8.0E-4 eq/L and pH of 9.5. ...

**Stats**

two tailed test for experiment with N= 24. Can't find table of t critical values, but tcv@ df=13. Compared tobt with tcv. Will this more likely create type I or type II error?

**math**

the product of 237 and 13

**physics**

The load-bearing piston in a certain hydraulic system has an area 20 times as large as the input piston. If the larger piston supports a load of 2000N, how large a force must be applied to the input piston? A certain boat displaces a volume of 4.5m3 of water (the density of ...

**Civ/Hum**

How is Modernity reflected in the movie Metropolis

**english**

assign each word a part of speech A mistake at a pharmacy sent to the hospital.

**Grammar**

What are the nouns in the sentence whales have brains as big as watermelons.

**Ochem**

Which Alkene is capable of stereoisomerism: 1-pentene, 2-methyl-1-pentene, 2-methyl-2-pentene, 2-pentene, or 2,3-dimethyl-2-butene?

**Criminal justice**

Write a 700- to 1,050-word paper in which you describe the issues facing police departments in today’s society. · Include a description of how local, state, and federal law enforcement agencies currently interact with the U.S. Department of Homeland Security (DHS...

**math**

4,000

**math**

Janet took out a loan of $50,000 from Bank of America at 8 percent on March 19, 2006 which is due on July 8, 2006. Using exact interest, the amount of Janet's interest cost is

**chemistry**

Fill in the missing value for V. P=1.2 atm, n-5.00 and T= 300.15 K....how do I set up the PV=nRT or do I solve in a different way?

**economics**

Is limitless growth really possible? What forces do you think will be most important in slowing or halting economic growth?

**math**

rounded to the nearest ten i am 12750. i am a multiple of 2 i use only 4 different numbers in all my 5 places.

**Spanish**

javier le presta el abrigo a maripili

**Physics**

Suppose a cylindrical platform with moment of inertia 0.005kg m2 is freely rotating at angular speed 10 rad/s. A disc initially, rotationally at rest with mass 0.6kg and radius 0.1 m is dropped onto the platform so that their centers coincide. The kinetic frictional ...

**MATH**

A polygon has 20 diagonals .how many sites it have? ans 8 BUT HOW DO WE GET IT

**MATH**

Ten different letters of an alphabet are given .2 of these letter are followed by two digits are used to number the product of a company .in how many ways product can be numbered? ANS CHOICES ARE 52040 8100 5040 1000 4000

**math**

how many five doght numbers can be formed using the digts 0,2,3,4,and 5. when repetition is allowed such the number formed is divisible by 2 or 5 or both. ans. choices are: 100 150 3125 1500 125

**math**

how many 5 dight numbers are there with distinct dights. ans choices arw 144 27216 4386 6843 720 I need to see how to solve it step by step thanks

**math**

Find the number of words which can be formed by using the letters of the word EQUATION if each word has to start with a vowel. this a permutation question ans, choose are 40320 1260 1080 400 25200

**MATH**

Find the number of words which can be formed by using the letters of the word EQUATION if each word has to start with a vowel.

**math**

Find the number of words which can be formed by using the letters of the word EQUATION

**math**

In how many ways can 15 stduents be seated in a row such that the 2 most talkative children never sit together? answer choose are a. 14!,14! b. 15,14! c.14! d. 14!13 e. 15!

**math**

A teacher prepares a test. She gives 5 objective type questions out of which 4 have to be answered. Find the total ways in which they can be answered if the first 2 question have 3 chioce and the last 3 have 4 choices. I think this a permutation question need help

**math**

What is the largest possible domain for the function? F(x) = ã x + ã (4 - x^2)

**math**

if you join all the vertices of a heptagon how many quadrilaterals will you get?

**math**

What is the largest possible domain for the function f(x) = sqrt x + sqrt(4 - x^2) ?

**math**

if Y = -X^2 -6x - 8 find the value(s) of x when y =1. ans choices are -3 3 o 9 i need help working this problem

**math**

If A = {a, b, c, d} and B = {-1, 0, 1} which of the following relations is a function from A to B. a.(i) {(a, 0), (c, 1), (d, -1)} b.(ii) {(a, -1), (b, -1), (c, 0), (d, 1)} c.(iii) {(a, 1), (b, 1), (c, 0), (d, O)} d.(iv) ({a, 1), (b, 0), (c, -1), (o.O), (a, -1)} answer choice ...

**math**

What is the largest possible domain for the function f(x) = ~x + ~(4 - x^2) ? a.{x: O:::;x:::;2,x ER} b.{x: -2 :::;x :::;2, x E R} c.{x: 0 s X :s 4, X E:R} d.{x: x 2': 2, x ER}

**math**

if Y = X2(xsquared) -6x - 8 find the value(s) of x when y =1. yes there was a typo its x squared i don't know how to rise the 2

**math**

if Y = X2(xsquared) -6x - 8 find the value(s) of x when y =1. yes there was a typo its x squared i don't know how to rise the 2

**math**

if Y = _X2 -6x - 8 find the value(s) of x when y =1.

**Complete subjects and predicates**

A young boy asks for help.

**math**

. Two groups of students are using a dynamic geometry software program to investigate the properties of quadrilaterals. The first group has concluded that the diagonals of a quadrilateral always bisect each other. The second group of students is not convinced. Which of the ...

**math**

While investigating the properties of parallelograms using a dynamic geometry software program, a student notices that the diagonals of a parallelogram seem to bisect each other. The student conjectures that this statement is true for all parallelograms. Which of the following...

**alegebra**

amelia gets 4 points for each correct answer and loses 1 point for each worng answer. One her last quiz she earned 50 points and answered 25 questions. write a system of equations

**macroeconomics**

As an economist, you have been asked to write a letter to a meeting of international professionals to explain the differences between microeconomics and macroeconomics and to provide real-world examples. Please write a letter of 4–6 pages including, but not limited to the...

**math**

Cuts of beef/High fat/Low fat/ total Flank steaks/ 74 / 386 / 460 Rump roasts/ 258 / 142 / 400 Total /332 /528 / 860 A USDA inspector is grading cuts of beef at a meat packing plant. If a piece of beef is selected at random, what is the probability that it will be a flank with...

**math**

a box contains 5 red and 4 blue balls. In how manys ways can 4 balls be chosen such that there are at most 3 balls of each colour.

**math**

a solid cube of a aluminum has sides 9cm long. A metallurgist would like to melt the cube down and use all the molten aluminum to make three smaller, solid congruent cubes. What should the lentgh, in centimeters, of a side of one of the smaller cubes?

**math**

two teams meet in playoff series at the end of the regular season. Team A won 55 of 81 games played in its home stadium during the regular season, while Team B won 48 of 81 games played in its home staduim. The first two games of the series will be played in Team A's home ...

**math**

two teams meet in playoff series at the end of the regular season. Team A won 55 of 81 games played in its home stadium during the regular season, while Team B won 48 of 81 games played in its home staduim. The first two games of the series will be played in Team A's home ...

**geometry**

If the area of a square is 100 cm. What is the area of each triangle produced if you draw two diagonals in the square?

**chem**

Calculate the pH after 0.12 mol of NaOH is added to 1.00 L of 0.60 M HF and 1.06 M KF

**chem**

Calculate the pH after 0.12 mol of NaOH is added to 1.00 L of 0.60 M HF and 1.06 M KF

**algebra**

Please help me solve this function? f(x)= -4(x-3)^3 (x+1)^2