# Posts by SARA

Total # Posts: 4,537

Algebra 1
Roman mixes 12 liters of 8% acid solution with a 20% acid solution, which results in a 16% acid solution. Find the number of liters of 20% acid solution in the new mixture. show your work

Chemistry
How would I find the pH of these? I found it for d and e, but I don't know how to do the rest a) 0.25M carbonic acid b) 0.075M CN- c) 0.15M F- d) 0.015M HCl (I got 1.8) e) 0.015 M NaOH (I got 12) f) 0.050 M acetic acid

English
Why was Memorial Day originally called Decoration Day? It was a better name for the holiday than Memorial Day. People used to make decorations on that day, but they no longer do. People decorated soldiers' graves with flowers on that day. Decoration is a more old-fashioned...

English
To what people does John Winthrop compare the Puritans in "A Model of Christian Charity"? the ancient Egyptians the ancient Romans the ancient Israelites the ancient Babylonians

Chemistry
I did and I got 0.015 as my answer: 2.2x10^-4 = 4z^3 3√2.2x10^-4 = 4z^3 0.060368107 = 4z 0.015 = z

Chemistry
Determine the molar solubility of Y for XY2 if Ksp is 2.2x10^-4 The answer is 0.038, but I'm not sure how

Chemistry
Thanks a lot!

Chemistry
For this question, I know how to answer the first three questions, but not the rest. 12ml 0.025 M of benzoic acid (Ka=6.3x10-5)is titrated with 0.050 M NaOH. How many moles of benzoic acid are there? I got 0.0003 What volume of NaOH is required?(L) I got 0.006 What is the ...

Chemistry
ok thanks!

Chemistry
I have this question as a review question: The reaction N2(g)+3H2(g)<-->2NH3(g) begins with 1.15 M N2 and 1.36 M H2. At equilibrium, the concentration of NH3 is 0.78 M. Determine the extent of reaction. The answer is supposed to be 86 but I don't know how

History
Is it b?

History
Either A or D

History
Which is an argument against free trade? It increases the prices for many products. It violates basic economic principles. It encourages outsourcing. It leads to international conflict.

History
Which is not an argument for free trade? It results in less expensive goods for many people. It allows countries to focus on what they do best. It eliminates unemployment in developed nations. It encourages international cooperation. I think its either B or C

Biology
Why do introduced species often disrupt an ecosystem?

Biology
The water cycle is best described by which of the following statements? Water in the atmosphere must be converted to another chemical before animals can use it. The water on earth changes forms as it moves from one reservoir to another.>----- My answer As water moves ...

Biology
Which of the following biomes covers the largest area of earth? tundra marine-----> My answer grassland forest

History
What colonial policies or practices played a part in peaceful or violent transitions to self-rule Following World War 2?

World War 2
how did the response of the League of Nations and of Britain, France, and other European nations to Axis aggression contributed to the start of the war?

World War 2
What were the causes of World War 2?

English
In “The Birthmark,” what does the birthmark represent for the two main characters, Aylmer and Georgiana? At the end of the story, what does the birthmark come to symbolize? I read the story I just don't understand the question

Chemistry
I have know clue how to answer this, but I tried something.(predicting products of electrolysis in aqueous solution)/ Predict the products of the electrolysis of a solution of aqueous MnSO4. I first wrote this: Mn^2+ SO4^2- Then for Mn^2+, it can be reduced to Mg(s) -2.36V and...

Chemistry
Thanks, but I don't know how to solve it. This was a question from my review

Chemistry
Consider the NiCd (nickle cadmium) cell found in rechargeable batteries. 1.)Which element is the cathode when the cell is recharging (being electrolytic)? 2.)How many cells must be present to produce 1.2 V 3.)Which element is the anode when the cell is discharging (being ...

Chemistry
Predict the products of the electrolysis of a solution of aqueous MnSO4 given the following choices: a. H2SO3 (aq) b. O2 (g) c. H2 (g) d. OH- (aq) e. Mn (s) f. e- g. H+ (aq) how is the answer O2 and H2SO3?

math
never mind I got it

math
solve each of the following initial value problems and plot the solutions for serveral variables of ynaught a)dy/dt = -y+5 I got to the point where I have: y= ce^-t + 5 they give y(0)=y(naught) so I tried plugging in 0,0 and got c to be -5. but the answer they give in the back...

math
last one is \$300

math
From the following data calculate final balance and forward it in the pay stubs. Beginning balance \$2000 Jan 2 Deposit \$500 Jan 10 Check written to Alex company \$600 Jan 16 Check written to Angels Company

Chemistry
I figured it out! thanks

Chemistry
Balance TeO3^3- + N2O4 --> Te +NO3^- using oxidation numbers

History
Which was not a reason for U.S. intervention in Latin America during the Cold War era? Allende's rise in Chile Sandinista control of Nicaragua Argentina's invasion of the Falkland Islands civil war in El Salvador

ap english
thanks reed :)

ap english
i checked that already Ms. Sue, but google isn't give a good answer. Is there any character you might have in your knowledge? I'll do the research myself. I have to write an essay on this. thank you

ap english
does anyone know of any reference of gluttony in literature? thanks!

Biology
Describe how the nervous system helps different parts of your body communicate with one another the moment you begin to pet a dog.

English
Which pronoun correctly completes the sentence? Please send __________ the directions when you can. A. she and I B. she and me C. her and me D. her and I I know its either C or D

Life skills
A good leader is never a follower. True False

Life skills
Achieving happiness in your future career is an example of a short-term goal. True----> My answer False

Life skills
Thank you

Life skills
is it it the third

Life skills
Tom uses pesticides to manage his garden. He is: saving time and money conserving water ----> My answer exposing the environment to harmful toxins causing unnecessary air pollution

Life skills
onathan wants to go to The Ohio State University someday. His dad is trying to decide between two job offers, one of which is from The Ohio State University. Jonathan has been advising him to take the OSU job because he would then get free tuition. Jonathan hasn't really ...

Math
What is the value of the function when x = 3? x −2 −1 1 3 4 y 4 3 6 5 8

HELP PLEASE NOW
Orrrrr we're not all cheating we just don't get the questions because a textbook doesn't work with all kids.

Health check?
Match the term with its definition. (Points : 12) Potential Matches: 1 : to cook uncovered by direct heat 2 : to cook in a small amount of liquid in a tightly covered pan over low heat 3 : to cook in water or liquid in which rolling bubbles have formed 4 : to cook food in a ...

Writing
what are the six questions for examining a source’s reliability?

Social studies
What are Eleanor of Aquitaine's ideas and what did she want to be when she grew up

Biology
How does comparing the embryos of different organisms support the theory of evolution? The embryos of all organisms are identical. The stages of development of the embryos of different organisms are extremely similar, thereby suggesting common ancestors. The embryos of any ...

Biology
the second one?

Biology
Why was Charles Darwin able to offer a large amount of evidence for his theory of evolution by natural selection? He compiled the fossil record. He collected data for 5 years while traveling around the world. He conducted in-depth experiments with chemicals in England. He ...

Biology
is it the first one?

Biology
Based partially on his comparative studies of the fossils of woolly mammoths and the bones of modern-day elephants, Georges Cuvier proposed several new ideas about the history of life on earth. Which general statement can be made about this example? Through specific studies, ...

physics
a ball of mass m is thrown vertically upwards with Vo= 10j m/s. Study nature of motion

Chemistry
Balance the reaction using half reactions under BASIC conditions: Al + CrO4^-2 ---> Al(OH)3 + Cr(OH)3 I tried to solve this question and ended up with this: Here are the two half equations Al ---> Al(OH)3 CrO4^-2 ---> Cr(OH)3 For Al ---> Al(OH)3, I did 3OH^- + 3H2O...

Macroeconomics
If investors sell their stocks and increase their money holdings due to a bad economy then A. demand for loanable funds will increase. B. demand for loanable funds will decrease. C. supply of loanable funds will increase. D. supply of loanable funds will decrease. E. quantity ...

cell notation
Given the balanced net ionic equation Zn(s) + 2H^+(aq) <---> Zn^2+(aq) + H2(g) would the cell notation be: Zn|Zn^2+||2H^+|H2 (i'm not sure if hydrogen gas should be in the cell notation)

Chemistry
From the equation below, how many grams of barium sulfate can be produced from 20.8 g of barium chloride? BaCl2 + Na2SO4 -> BaSO4 + 2NaCl

Chemistry
When 2.05 moles of CH4 are mixed with 5.03 moles of O2 in the reaction below, the limiting reactant is CH4 + 2O2 -> CO2 + 2H2O

Chemistry
Balance the reaction using half reactions under BASIC conditions: Al + CrO4^-2 ---> Al(OH)3 + Cr(OH)3 I'm not sure how to do this question.

chemistry- Check please
I am also supposed to write out a balanced equation and cell notation equation for each reaction that produced a positive voltage, but all of mine were positive

chemistry- Check please
Well I'm a bit confused. I have an assignment where I am to do an online lab. First I'm supposed to find the highest and lowest voltage. For all of my Ecell, I got a positive answer. I have another question which says "Explain what a negative voltage on the volt ...

chemistry- Check please
I am given a question where I have to state which combination of electrodes will result in the greatest voltage and which will result in the lowest voltage. The metals given are Zinc, Copper, Silver and Hydrogen I calculated the Ecell for each combination and got the following...

Math
Can someone help me? If a and b are any two real numbers, explain how you calculate the difference a – b. Be sure to include the following in your explanation: a. A description of the relationship between addition and subtraction b. How you can use a number line to help ...

Please help
If there had not been a system of military alliances in place in Europe in 1914, would the assassination of Archduke Franz Ferdinand have resulted in World War I?

Please help
How did World War I and its aftermath contribute to the rise of fascism in Europe in the 1920s?

Please help
I think it is 2nd one?

Please help
Which best describes Hitler's beliefs as expressed in Mein Kampf? Revolution was needed to create a classless society. Germany could control the world with the help of the Japanese. All races could live peacefully under German domination. Jewish people were to blame for ...

Please help
Which is true about communism but is not true about fascism? uses secret police creates powerful leaders opposes democracy has the ultimate goal of equality is it the second?

History
Which best describes Vladimir Lenin's vision for Russia? Professional revolutionaries would seize power for the working class. The Red Army would achieve victory over Germany in World War I. Democratic revolution would depose the tsar. An alliance with Britain and France ...

Lit
sorry for late responses but im trying to work on the paper as much as i understand

Lit
use

Lit
how would puse ethos,pathos, and logos for this topic

Lit
I need help, we start to write a research paper and we picked our own topic, 1 requirement was to use (mlk letter from birmingham jail) how do i relate this to inequality in wealth distribution.

Chemistry-check answer please
I am given a question where I have to state which combination of electrodes will result in the greatest voltage and which will result in the lowest voltage. The metals given are Zinc, Copper, Silver and Hydrogen I think that silver and copper would give the greatest voltage ...

Chemistry
I'm not sure where to start. Is this correct so far? I first write a balanced chemical equation using HF and water HF+ H2O <->H3O^+ + F^- The use the ICE table where the E row is: HF=0.50-x H30+= x F-= 0.75+x Then the Ka equation Ka=[H3O+][A-]/[HA] where Ka=(x)(0.75+...

Chemistry
Determine the pH of a buffer made from 250 ml of 0.50M HF and 150 ml of 0.75 M NaF.

Chemistry
thanks!

Chemistry
How would I find the pH of 0.25 M carbonic acid? also the pH for 0.075 M CN^-?

Chemistry
Determine the molar solubility of Y for XY2 if Ksp is 2.2x10^-4. The 2 in Xy2 is a subscript. I found the Ksp equation which is ksp=[x^2+][Y^-]^2 Then I did the ICE table and got x and 2x for the equilibrium concentrations. Then I did: 2.2x10^-4=(x)(2x)^2 I solved for x and ...

Chemistry
the answer is supposed to be 7.5x10^-5 but I don't know how

Chemistry
Determine Ksp if the equilibrium concentration of X is 0.02 M and Y is 0.05 M given that X2Y(s)<-->2X^+(aq)+Y^(2-)(aq). The 2 in X2Y is a subscript.

SOLVED
solved this question

Chemistry
Determine Qsp if 8.7 ml of 2.1 M AgNO3 is added to 1.7 ml of 1.5 M CaCl2 .The Ksp of AgCl is 1.77 x 10^-10.

English
1.D 2.D 3.D I'm not sure

English
Story : The Ethanol Debate Natalie Stewart What feature of the selection BEST illustrates that it is a persuasive essay? A) < -- A? the chart showing the rise in corn prices B) the information on how farmers feed their herds C) the description of how ethanol use costs ...

Chemistry
hmm ok thanks though!

Chemistry
I think it is the percent yield. the answer is 86.029411764706 but i'm not sure how

Chemistry
The reaction N2(g)+3H2(g)<-->2NH3(g) begins with 1.15 M N2 and 1.36 M H2. At equilibrium the concentration of NH3 is 0.78 M. Determine the extent of reaction.

Math
Select the inequality that models the problem. The length of a rectangle is four times its width. If the area of the rectangle is less than 100 square meters, what is the greatest width of the rectangle? 4w + w < 100 4 + 4w < 100 4w < 100 4w • w < 100

English
Researchers from around the world have declared this fast-acting, appetite suppressant as a modern medical miracle for Americans who struggle with weight loss. A)transfer B)plain folks C)testimonial D)name calling C ?

general math
if 3 1/2 bags of seed cost \$35, what will 4 1/2 bags cost?

Math
Eduardo started a business selling sporting goods. He spent \$7500 to obtain his merchandise, and it costs him \$300 per week for general expenses. He earned \$850 per week in sales. What is the minimum number of weeks it will take for Eduardo to make a profit? Write an ...

Math
The length of a rectangle is four times its width. If the perimeter is at most 130 centimeters, what is the greatest possible value for the width? 13 cm 21.7 cm 26 cm 52 cm

math 0312
The current in a stream moves at a speed of 9 mph. A boat travels 17 mi upstream and 17 mi downstream in a total time of 13 hrs. What is the speed of the boat in still water?

Statistics
SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many...

Chemistry
A flask contains 25.0 mL of diethyl ether weighth 18.74 µg (micrograms). What is the density of the diethyl ether and grams per liter? I'm not sure how to set this problem up correctly.

Chemistry
Sulfur dioxide reacts with chlorine to produce thionyl chloride and dichlorine oxide S: 32.0 amu O: 16.0 amu Cl: 35.45 amu SO2 + 2Cl2 --> SOCl2 + Cl2O If 0.400 moles of chlorine gas reacts excess sulfur dioxide, how many moles of dichlorine oxide are forme?

Chemistry
Aluminum metal reacts with iron (III) oxide to produce aluminum oxide and iron metal. Answers the following three questions note: you will need to write a balanced equation to answer them Al: 26.9 amu Fe: 55.8 amu O: 16 amu 1 How many moles of iron (III) oxide are required to ...

Chemistry
Solutions of sodium hypochlorite, NaClO are sold as bleach. They are prepared by the following reaction: 2NaOH + Cl2 --> NaCl + NaClO + H2O If you have 2.32 mol of NaOH and 2.74 mol of Cl2 ga available to react, answer the following questions Na: 23.0 amu Cl:35.5 amu O: 16....