# Posts by Erica

Total # Posts: 615

**chemistry lab titration**

Are the pH's at 5mL, 15mL, and 25mL equal the respective pKa's (11.60, 6.77, and 2.25) since they are all half-equivalence points?

**math 10 general math**

what is the yield for 8.5% compound continously?

**math**

What is a generalization for this set of polygons: square, hexagon and a pentagon

**10th grade**

The question is asking you what you'all did there?

**Physics**

I'm sorry, but that doesn't make sense to me, is there any other way you can explain it? Thanks.

**Physics**

A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 2.7 m/s. After the collision, the second ball moves off at 60° to the left of its original direction. The stationary ball moves off at 30° to the right of the moving ball's original ...

**biology**

I believe that it is A

**math**

So you need to make two equations, and then use substitution. I used A for the larger number and B for the smaller: A=B+5 4A+3B=97 Then you plug in (B+5) for A in the second equation... 4(B+5)+3B=97 4B+20+3B=97 7B+20=97 7B=77 B=11 A=5+11 A=16

**earth**

1. a 2. b

**3rd grade math**

1600

**algebra**

what is n/15=120

**math**

CAN YOU SHOW ME THE QUICKEST WAY TO DO ALGEBRA

**maths**

if there are 48 matches in a box how many will there be in 6 boxes

**4 grade FL social studies weekly**

20th

**5th grade**

Estimate 5,602_2,344

**math**

3X42

**psychology**

What task component distinguishes the Wechsler Scales from the SBIS?

**12th grade Biology**

followhich of the wing accurately shows the correct terms for the two sides of a chemical equation, correctly placed to the lelf or to the right where they belong ,and also shows the correct symbol that is written between them

**English - A lesson before dying**

what are two plot related titles and their pose or tone related title?

**college**

how to work symbolic representatios? i need to find the domain and range

**Chemistry**

there is a picture on google images... if you type in "crystal structure of lithium sulfide"......

**Chemistry**

The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: a)the coordination number of Li and S b) the number of formula nunits in the unit cell c) the density of Li2S

**Chemistry**

The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: (I could not paste the actual picture from the assignment here, but if you go to Google Image and type in "crystal structure of ...

**Physics: Electricity and Magnetism**

Four charges on a rectangle that is 6 cm by 3 cm. All but one of the corners has a positive charge. The magnitudes of the charges are all 8.40e-12 C. What is the net electric field at the center of the rectangle?

**algebra 1b**

i need to know how to solve certain problems like this 4x=2y-10 x+2y=5 i need examples of this and shown to me step by step

**Psychology**

I haven't watch that movie before, do you mind telling me exactly which part relates to memory and learning? I tried to find it in youtube, but not sure which part. thanks!

**Psychology**

This is a homework assignment for my Psychology course on Memory and learning. Find a Movie/video clip (1-3 mins)that demonstrate a concept / phenomenom relevant to learning and memory? My prof used Matrix (what we see is just our neuron firing) and Bourne Idenity(amnesia)for ...

**Englsih**

This is one of my english homework. Can someone have a look at it and give me some suqqestions. Thank you. The Summary of English Grammar defines the major word-classes in terms of meaning rather than structure. By references to any one of the major wordclasses state the ...

**English**

My other friend with the same assignment put dual for all of them.

**English**

YesYes. The question original is: Indicate the case, person, number and gender of the bracketed words. I only have trouble with indicating the gender. Thanks!

**English**

Indicate the gendr of the bracketed words. I tired them but I am not sure am I right or not. Please look over it and give me suggestion if they are wrong. Thank you!! (They) told the (children) the (stories) they had heard (themselves). They - collective children - collective...

**English**

I have did the corrections for my english homework I posted a few days ago. Can someone check it over again and give me some suggestion if they are still wrong. Thank you!! Identify the phrase in the sentence below, and name the kind and function of each phrase. a)Having had a...

**English**

This is my english assignment, hope someone will look over it for me!! Thanks Identify the phrase in the sentence below, and name the kind and function of each phrase. a)Having had a good season, they hoped to win the trophy. having had a good season: participial to win the ...

**BUS 210**

This isn't that hard, just read the f*ing chapter

**Math**

did u say divide 6 3times

**3rd grade**

The Pilgrims were seeking freedom

**chem**

how do i calculate the concentration of F ions using pH in ppm

**Statistics**

Assume that men constitute 49% of population in a country. Assume also that among men there are 5% of color-blinded. Find the proba- bility that a person chosen at random is a color-blinded man.

**Chem**

find pH of 0.050 M HCLO4 plus 0.050 M HBr> You must consider activities>

**math**

the edges of a cube are 3 inches long. what is the surface area, in square inches, of this cube?

**health**

the main reason you should rduce your intake of eggs is because egg yolks

**math**

Is the following set of numbers a perfect triple? 13, 15, 18 Why are they, or why not

**chemistry**

What does the statement the properties of salt are different from the properties of elements that go into making them mean

**Math word problem**

I am having problems with this part: add the equations... 33+63)km/time=64km/hr then time= 96/64 hr (I know this is 1.5) Now solve for speed of wind in the first equation.. (is it 33km/1.5 =22) 33km/time=32km/hr-speedwind.

**Math word problem**

Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What is the speed of the wind? I don't understand any of the responses. You have to assume in this case the wind retards and assists with the same ...

**Help**

Erik bicycles 32 km/h with no wind. Against the wind he bikes 33 km in the same time it takes to bike 63 km with the wind. What is the speed of the wind?

**MATH**

WHAT ARE THE BEST WAYS TO STUDY FOR MATH TEST...

**physics**

at 10:15 am, Snail 1 crossed the 65-cm mark with a velocity of 4cm/min. in a great burst of energy, snail 1 raced to the 90-cm mark in 3 minutes. his velocity as he crossed the 90-cm mark was 7 cm/min. what was the acceleration of snail 1?

**11th grade**

your pet dog runs around in circles, chasing his tail. Does this mean acceleration?

**biology**

if boron has 5 protons in its nucleus how many neutrons are there?and how many electrons? what if b-7 was an isotope how many nentrons are present in this atom? thanks for your help

**Pre calc**

How do you write a quadratic equation in standard form for a given set of zeros?

**science**

what is a flatcurved surface called

**history**

Nixon's policy of "engagement" with the Communists was called detente. Rather than military confrontation, Nixon championed diplomatic conversations. Nixon ended the Vietnam war, went to Red China, and started the nuclear arms reduction treaties. Nixon's ...

**algebra**

i figured it out :)

**algebra**

If y varies jointly with x and z, and y=24 when x=3 and z=2, then the value of x when y=6 and z=0.5 is 12 6 1 3 1/3

**ecology**

what part of the plant absorbs the most water?? Is it the stem?

**CRITICAL THINKING**

not sure

**math**

Thank you.

**math**

How would I find the a for the equation y= a(x-h)^2+k. I'm looking at a graph, and I can solve for everything except for a. What is it supposed to be?

**U.S. History**

What were the key arguments for and against U.S. imperialism during the Spanish American War??

**molarity**

what mass of sodium hydroxide, NaOH, must be dissolved to make 460 ml of a 1.10 M solution

**english**

the subjuect of a sentence may be what parts of speech?

**math Thanks to everyone for the help it's needed!**

what would be the radius of a circle with a diameter of 8 inches?

**math**

what is the average of 132,145,140,128? do u add them all togher then divide ? or just add them and get the answer?

**math**

robert bought a used car for $1,500.00 if the sales tax is 5% what is the total that he paid?

**math**

2/3+4/6+?

**math its been years since school**

a cube measures 3 inches on all its sides. Wgat is its volume in inches?

**math**

what is the perimeter of a triangle which sides mesure 6,8,and 10 inches?

**geometry**

what is the area of a rectangle with a width of 12 feet and a length of 10?

**math**

1 pie with diameter of a to b then radius of top to bottom half of c to o the chord is angle cob right. the questions are a. which chord is not a diameter b. name a central angle that is a right angle c. name a inscribed angle

**math**

8/9 x 1 1/5 x 10

**science**

Why does covering and refrigerating food help reduce spoilage from mould?

**physics**

If the filliament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12 volt battery? I got 36 watts? would I divide 12 volts/3 ohms= 4 amps

**physics.**

please check my answers. when a lamp is plugged into a 120 V socket, each coulomb of charge that flows in the circuit is raised to a potential engergy of 120 joules? which offers more resistance to water flow, a wide pipe or narrow pipe? I got wide as my answer. Similarly ...

**math**

I am havnig a problem understanding the rules of long division with decimals can you explain

**Math**

Factor pairs

**Math(Factoring)**

x^2+4 x^2+4 = (x + 2 i) (x - 2 i) Wouldn't you need a value for x? Or do u just have to make an expression? An expression for this example would be xx+4 O never mind my answer was incorrect. Sorry about that.

**Factor:**

x^2+4

**Math!Please Help!**

Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at the local hospital. ...

**Math**

Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at the local hospital. ...

**Math**

Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at the local hospital. ...

**Math**

Directions:Write inequalities for the numbers 2 - 4 below. Do not solve them! Problems: 2.Your quiz grades are 19, 17, 20, and 15. What is the lowest grade you can receive on the next quiz and maintain at least an 18 average? 3.Stacey and Luis volunteer at the local hospital. ...

**Math Help**

Directions are that i have to solve the equation and graph it using words.I have to include whether itis a solid or dotted line and which way the shading is. Problem: -2x+3y<-6 dotted line. There is no equals in the problem. Which way for shading... solve for y y<2/3 x -...

**Algebra**

Directions say that I have to solve and graph the equation using words.I have to include whether the lines are dotted or solid, how to graph each of them and where the solution is shaded. 2x-3y>_9 and -x-4y>_8 both should be solid, because the solution is greater than OR...

**Science**

How do clouds form, and where in canada would you expect to see certain types of clouds. What is the difference between clouds and fog? http://en.wikipedia.org/wiki/Cloud

**Science**

1. How do meteorologists forecast El Nino and La Nina? 2. Effects of El Nino and La Nina with regards to ocean currents and air currents. Meteorologists have not been very successful at forecasting them so far; it is mainly a question of monitoring it to see of they is there. ...

**Science**

Why is it impossible to have an Arctic Circumpolar Current? http://www.whoi.edu/science/PO/arcticgroup/projects/proshjohnson-two-regimes.pdf

**Language Arts**

How do I do a Bibliography for an interview? Thank you for using the Jiskha Homework Help Forum. Here are some sites on how to write a Bibliography and the second one is good for an interview: 1. http://dicksonc.act.edu.au/Library/bibliog.html 2. (Broken Link Removed) Here'...

**Science**

Can someone tell name 6 effects of ocean currents? Thanks Since this is not my area of expertise, I searched Google under the key words "'ocean currents' effects" to get these possible sources: http://www.thecanadianencyclopedia.com/index.cfm?PgNm=TCE&Params=...

**12 chemistry**

What is the average ion concentration in a 7.9 mL saturated solution of calcium hydroxide containing calcium chloride (CaCl2)?

**Community College**

waht is the impact of a stock repurchase on a companys debt ratio? Does this suggest another use for excess cash? The correct subject in the subject line will get you help in a more timely manner, and will aid in not wasting the time of other teachers. When a company ...

**math**

a small farm field is a square measuring 340 ft on a side. what is the perimeter of the field?

**Business**

What are the sectores of the economy? Since this is not my area of expertise, I searched Google under the key words "economy sectors" to get these possible sources: http://www.tutor2u.net/economics/content/topics/development/development_economy_sectors.htm http://...

**unit rates**

$60 for 8 h

**Physics**

Spent steam from an electric generating plant leaves the turbines at 120.0 degrees Celsius and is cooled to 90.0 degrees Celsuius liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each kilogram of spent ...

**Physics**

A 50.0 g silver spoon at 20.0 degrees Celsius is placed in a cup of coffee at 90.0 degrees C. How much heat does the spoon absorb from the coffee to reach a temp. of 89.0 degrees C? Rememeber this equation. It, or a slight modification of it, will work all of these heat ...

**physics**

lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0 degrees Celsius? q1 = heat to move ...

**Physics**

Which provides more cooling for a styrofoam cooler, one with 10 lbs of ice at 0 degrees C or one with 10 lbs of ice water at 0 degrees C. Explain. qice=mass*heat of fusion. qH2O=mass*specific heat x delta T However, you aren't given a two temperatures; therefore, you can&#...

**Physics**

a 1.0 metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase? (Chead=0.11 kcal/kg degrees C) 1/2 m v^2 = mc Deltatemp solve for deltaTemp.

**ethical issues**

What international moral code, if any, is being violated by the Bank? What bank? What did "the Bank" do that might have violated international moral code? Please explain and we'll be glad to help you find the answer.