Friday
July 25, 2014

Posts by jenna


Total # Posts: 491

Chemistry
why do some combinations of ionic compounds form a precipitation while others do not

Chem
Thank you.

Chem
Why does sodium in phenolphthalein change color?

science
what kind of consumer always follows a producer in a food chain?

DT
What are the three main properties of a Conker shell ?

Chem
you would use Calcium because its the limiting reactant? So... 40.078/131.015 = .305903 Then... 2.55g X .305903g Ca/1g = the theoretical yield?

Chem
Question: "Calculate the theoretical yield of calcium carbonate of you react 2.55g of calcium chloride dihydrate with an excess amount of sodium carbonate." I got the molar mass of calcium chloride dihydrate which is 131.015 g/mol, but Im not sure how to start the eq...

Biology
is it water?

Biology
The most abundant molecule found in all types of cells is?

Math ... HELP!!!!!
Find the factors of 78 and 104,what is a factor that is the same number on each? That is the answer!:-)

Chemistry
so like if the ratio was 2:4 it would become 1:2?

Chemistry
ok so here's the question- For the compound Ge[S(CH2)4 CH3]4, determine: a) the ratio, by number, of C atoms to H atoms b) the ratio, by mass, of Ge to S I know this can't be THAT hard...but I'm really not sure on how to get the ratio. for a would I just add up the...

Gen. Chemistry
How do I "determine the mass percent of H2O in the hydrate Cr(NO3)3 * 9H2O to 3 significant figures"?

physics
A ball is thrown downward, with an initial speed of 8.09 m/s, from a height of 30.1 m. After what time interval does the ball strike the ground?

physics
A dog searching for a bone walks 2.87 m south, then runs 22.5 m at an angle 30.5 north of east, and finally walks 5.91 m west. Find the direction of the dog's resultant displacement vector. Give your answer as an angle in degrees, with the angle measured counterclockwise f...

physics
A dog searching for a bone walks 4.31 m south, then runs 8.93 m at an angle 22.0 north of east, and finally walks 10.0 m west. Find the magnitude of the dog's resultant displacement vector.

Literature
Thank you very much, Ms. Sue. Does this sound like a good opening line for my report? The Time Machine, by H.G. Wells,is an American literature classic relating the tale of a young scientist who travels through time with the help of his invention, the time machine.

Literature
But does the author write in this particular book what time frame the main character lived in?

Literature
I am writing report on the novel The Time Machine, by H.G. Wells. I am supposed to write when the story takes place. I have searched through the book and the internet and can't find any hints as to what time frame the young scientist lived in. Please help!

American History
I need help writing a biography on John D. Rockefeller. I don't know much about him, but every time I search under his name I come up with a really complicated, long biography. I just need some information that a sixth grader can understand. Thanks for any help! These site...

AP Chemisty
N2(g)+3F2 yields 2Nf3(g) Delta H(degree)298=-264KJ mol-1;Delta S(degree)298=-278J K-1 mol-1 The following questions relate to the synthesis reaction represented by the chemical equation above. a.)CAlculate the value of the standard free energy change, Delta G(degree)298, for t...

math
Tyrone has $60 and his sister has $135. Both get an allowance of $5 each week. Tyrone decides to save his entire allowance, but his sister spends all of hers each week plus an additional $10 each week. After how many weeks will they each have the same amount of money? Tyrone s...

History
In creative writing, I need to write a short historical biography by a fictional person. For example, a pioneer, or an Indian when the Pilgrims came. I have to write it from that person's point of view. I chose a soldier in General Grant's army, in April of 1863, about...

Computers
I am supposed to type out a report, but our Microsoft Office Word program is messed up somehow. I have the letters set to Times New Roman size 8... but they're HUGE!!!!!!!! So big I can only fit about 5 sentences on a page. Also, at the end of every line, there is a weird ...

Biology
Today I found 4 ticks on my dog's head, and tomorrow she is going to be pet-sitted by my grandma, who also has a dog. I don't want her to bring ticks into my grandma's house, but I don't know what to do! We brushed her really thoroughly and looked all over her,...

Nutrition Ed.
Which one of the major concepts is Not included in the conceptual framework on which nutrition education is based? 1. Nutrition is how the body uses food. 2. Food is composed of nutrients required for health. 3. All persons need a variety of nutrients throughout life. 4. Handl...

Biology
What is the difference between a stamen and an anther in a flower?? Check this site for a diagram and explanation. http://www.enchantedlearning.com/subjects/plants/printouts/floweranatomy.shtml

Art
I am studying the Middle Ages, and am supposed to whittle something. I have never whittled anything more than the point to the spear I made from a stick, and don't know what to whittle. Any ideas for a simple beginner's project? Thanks for any help. Thank you for using...

Biology
Can dogs eat cheese? Yes. http://dogs.about.com/od/dietandnutrition/f/pur_mmburger.htm

History
Why was slavery a paradox? I don't understand the word 'paradox' very well, even though I looked it up and it is defined as "a self-contradiction". Please help, I think the answer might have something to do with a quote I found: "Democratic liberty e...

science
What is all matter made up of? Are you searching for atoms, electrons and/or protons? I hope this helps. Thanks for asking.

HISTORY PLEASE HELP FAST
I need a fairly brief explanation of the Inquisition. All I know is that it has something to do with killing "heretics" whatever they are. Try typing it into Wikipedia. The first paragraph in the article should give you a brief explanation of the Inquisition. Of my k...

Art
I need a creative idea for a gift. My mom's birthday is coming up and she loves the beach, so I want to do something with sand so she can enjoy it wherever we are. I have the sand, but I need help fast because this craft has to be finished by Thursday!! Please help somebod...

macroeconomics
an increase in GDP necessarily translated into improvements into the welfare of citizens? true or false. i think its true but im not sure I can think of examples when it would not be true. Consider a kingdom which increases total output because the king tortures, cajoles, or o...

macroeconomics
should we care more about nominal GDP or real GDP?? Thank you for using the Jiskha Homework Help Forum. Here is a link that discusses that very question: http://economics.about.com/cs/macrohelp/a/nominal_vs_real.htm A GDP based on the prices that prevailed when the output was ...

Math please check
Does 0.21 * 0.05 = 0.0105? * means multiply. Yes.

More Math
There have been about two years before the birth of Christ for every 3 years of history in all. If 4,000 years passed before Christ's birth, what is the total number of years in history? (Years BC)/(Years AD + Years BC) = 2/3 4000 y = (2/3)(Years AD + Years BC) 6000 y = (Y...

Math
There are 39 books in the Old Testament an 27 books in the New Testament. Write a ratio in lowest terms to compare the number of books in the Old Testament to the number in the New Testament. I don't quite remember how to do ratios, could someone please help? A ratio is a ...

FAST MATH HELP!
I can't remember the abbreviation for decimeter! Abbreviation: dm thanks hey.... the abb is dm.. 1. Factor 4m²+40m+100 2. The area of a circle is given by the equation A = ð(25x²+10x+1). Find an expression for the radius. 3. The bed of a pond can be modelled ...

English
We are putting together a scrapbook for my older sister, and we came up with some dictionary definitions for parts of her name, but does anyone know of a meaning for "Valaitis"? Thanks for any help. Thank you for using the Jiskha Homework Help Forum. What a nice idea...

Health
My dog all of a sudden has a small bright red lump on her front left leg. I have no idea what it is, and I'm kind of worried. It might just be a scab or something, but I don't know. Does anyone know what it could be? Thank you for using the Jiskha Homework Help Forum. ...

poetry
I would say no, the mariner was not alone on his ship, because there was the wedding guest with him! I went to google and looked up the poem, read it, and it looks like he mostly says things like "The ship was cheered, the harbour cleared,Merrily did we drop" and &qu...

History Essay
This essay is on Benjamin Franklin, and I was wondering why he went to Philadelphia at only 17. Did he run away or did his parents send him away? Where did he stay and work while he was there? I've researched on Google, but I can't find any good information. Also, why ...

History Essay-english problem
In my opening sentence for my essay "Weaknesses of the Articles of Confederation" should I write "The Articles of Confederation were the first governing document of the United States of America." or should I write "The Articles of Confederation was the...

Science
Neptune's largest satellite is named (Triton) and revolves in a ( ) orbit. Could someone help me fill in the second blank? Please help! Nevermind, I got that question wrong (I'm homeschooled and my computer program grades me) and later found out that the correct answer...

Ratio queston
find the ratio of the first number to the second number and simplify: 36 to 88 would it be 9/22 ? yup! good job!

Fun Fact!
Benjamin Franklin complained, "Let the smaller Colonies give equal money and men, and then have an equal vote. But if they have an equal vote without bearing equal burthens, a confederation upon such iniquitous principles will never last long." Franklin was talking a...

History Essay
I have to write a report on the Articles of Confederation and some of the problems with them. I have done some research, but I still need more info. Could you help? Check these sites. http://bensguide.gpo.gov/9-12/documents/articles/index.html http://www.yale.edu/lawweb/avalon...

History again
Who invented the sewing machine? This site will give you a very interesting history of the sewing machine. http://inventors.about.com/od/sstartinventions/a/sewing_machine.htm Thank you!

not a question: DRBOB222 YOUR AWESOME!!
THANK YOU DR BOB YOU ARE SO AWESOME!!!

Morse Code Please Answer!
My book doesn't explain how, for example, if D was --. and O was .-. than how would they tell the end of the D from the beginning of the O? Did they pause between letters? But then how would they know the difference between a "new letter" pause, and a "new w...

Science
I am reading about partial solar eclipses, and my book has this warning: CAUTION:Looking directly at even a tiny sliver of the sun during a solar eclipse can damage your eyesight permanently. Why do they give this warning specifically for eclipses? Is the sun more harmful to l...

Science
I am reading about partial solar eclipses, and my book has this warning: CAUTION:Looking directly at even a tiny sliver of the sun during a solar eclipse can damage your eyesight permanently. Why do they give this warning specifically for eclipses? Is the sun more harmful to l...

Space Science
I can't seem to understand why lunar eclipses occur only twice a year and not monthly. I have looked up a lot of answers, but I don't understand. Thanks for the help.

Science
Could someone please explain to me in a simple way how FM, AM, and XM radio signals work? No one I ask seems to know. Thanks for the help. Radio waves are part of a general class of waves known as electromagnetic waves. In essence, they are electrical and magnetic energy which...

macroeconomics--help me!!!!!!
Karmin wants to clean her house, finish her economics problem set, write her English essay, and spend time with her boyfriend. However, she only has time to choose one of these activities.Karmin chooses to finish her economics problem set. Hence, the opportunity cost of finish...

macroeconomics
Karmin wants to clean her house, finish her economics problem set, write her English essay, and spend time with her boyfriend. However, she only has time to choose one of these activities. Karmin chooses to finish her economics problem set. Hence, the opportunity cost of finis...

science
i dont know thats why i asked it

algebra
-5+n+16=-3 -5+n+16=-3 n = -3 + 5 - 16 n = 2 - 16 n = -14

AP Chemistry
A precipitate is formed by adding 20.0 ml of 0.200M of sodium phosphate to 30.0 ml of 0.50M Copper sulfate. b.) what mass of solid will be formed? c.) Calculate the concentration of each ion in the solution after the precipitation is complete. See the other post. Balance the e...

AP Chemistry
A precipitate is formed by adding 20.0 ml of 0.200M of sodium phosphate to 30.0 ml of 0.50M Copper sulfate. Please write the ionic equation Sodium phosphate and copper sulfate are both soluble, whilst copper phosphate is not. So, copper ions meet phosphate ions and precipate. ...

Science
Is Nuclear energy man-made or natural and HOW? Nuclear energy used to make electricity is not natural but man made. HOW. That's a long long story. Here is a site that should help get you started. Post with more specific questions after you have studied this. http://www.ene...

Physics
I have an exam tomorrow and I need to know these questions: 1. Velocity measures all of the following EXCEPT: a. the speed of an object b. the total displacement of an object c. the direction of an object's motion d. the displacement for each time interval 2. A car travels...

psychology
I have to create a powerpoint for my psychology class. The power point presentation has to be about intelligence. I have to compare the early and contempoary theories of intelligence. My question is do you know any reliable websites where I can find this information? Thanks ht...

psychology
what is the premack principle? This will explain the principle for you. en.wikipedia.org/wiki/Premack_principle http://en.wikipedia.org/wiki/Premack_principle

psychology
What is it the theory called when you tell your child that he can't go out an play until he eats his vegetables? .....very big grin..... Bribery! Maslow's Theory may be what you are looking for. See the site below. http://en.wikipedia.org/wiki/Maslow's_hierarchy_of...

psychology
In class we were asked to provide an one example of classical and operant conditioning. We have to identify the stimulus, response and reinforcers in each example. here are my examples: Clasical Conditioning- My cat comes running everytime she hears the can opener. Operant Con...

psychology
In class we were asked to provide an one example of classical and operant conditioning. We have to identify the stimulus, response and reinforcers in each example. here are my examples: Clasical Conditioning- My cat comes running everytime she hears the can opener. Operant Con...

psychology
What is it the theory called when you tell your child that he can't go out an play until he eats his vegetables? Please only post your question only once. I work almost on a daily basis, so my answers should be posted within 24 hours of you posting your questions. See your...

psychology
In class we were asked to provide an one example of classical and operant conditioning. We have to identify the stimulus, response and reinforcers in each example. here are my examples: Clasical Conditioning- My cat comes running everytime she hears the can opener. Operant Con...

psychology
Can someone give me an example or a classical conditioning and operant conditioning? The best-known example of classical conditioning was Pavlov's dog. In my own experience, I associate the smell of roses with funerals, probably because of an early childhood memory. Operan...

psychology
how can knowing the information processing model increase your learning potential? many decisions in our lives are based on intuition. Where does this intuition comes from? generally we see that older people have a better intuition on general day-to-day life. Likewise in share...

ethics
Can someone help me find out the similarities and differences between chinese american and japanese american cultural experiences. Some websites would be a great help thanks. Chinese American http://www.google.com/search?q=chinese+american&start=0&ie=utf-8&oe=utf-8&client=fire...

Math
I missied school Friday and am not sure how to do my math homework. here is one problem. If someone will help me figure this out and explain it I would be able to figure the rest out. ** Write two values of x for which the i nequality is true 4.5<x<4.6 Will someone pleas...

word unscramble
cimploy

ethics
I am suppose to list some characteristics of Orientalism, but there is nothing in my reading that pertains to that. Can someone help me get started please? This is an extremely broad term, referring to countries and cultures from Japan, China, Southeast Asia, and others in the...

science
name a chemical sometimes used to make the specimen visible on a microscope. answer needs to be 5 leters stain thank you tell me an example of solidification.. please :) When water, a liquid, freezes to a solid, ice. Also called crystallization. stage water a tube sdbfh

MATH!
If the edge of a cube is increased by 50%, then the volume is increased by x%. Find x. PLEASE HELP. THANK YOU. Let Y = edge of a cube. Y + 0.5Y = 1.5Y = new edge of the cube. Then old volume is Y^3 New volume is (1.5Y)^3 = 2.375Y^3. %increase = ([3.375Y^3 - Y^3]/Y^3) x 100 = x...

english
why is it so important to determine the credibility of a source? If you hire a guide to tell you when it is safe to swim in an alligator infested pond, do you think the guide's credibility is of importance? It is no less important when one uses a source to write a story; i...

critical thinking
How does thinking critically influence the way a person writes and processes information? Please tell us how you think thinking critically influences a person. We'll be glad to critique and/or add to your answer. You might try browsing here: http://www.google.com/search?as...

sociology
The Social Distance Scale..That is another measurement that they use...pg 47 chapter 2 if you want to look it up too :)

science
why does a candle appear to go out when a copper coil is placed over the flame? Combustion requires three things: fuel (wax here), oxygen (air here), ignition temperature (a match here probably). Remove one and the combustion stops -- that's the principles firemen use to p...

science
how is heat conducted along a piece of metal? http://www.gcse.com/energy/conduction2.htm

science
calculate the following(show steps): volume of a fish tank that is 15cm by 30cm by 10cm? http://www.math.com/tables/geometry/volumes.htm

science
what does shaking do that inceases the solubility of a solution? Shaking does not affect the solubility, but it will increase the rate that solids dissolve, and will also promote the formation of an emulsion if the ingredients are not soluble (e.g, vinegar and oil salad dressi...

science
identify the solute and solvent for this solution: copper II Sulphate solution The solvent is water. See if you can guess what the solute is.

science
what method of separation would do the best job to separate sand and water? hint* What would happen to the water if you put the mixture of sand and water in a pan and heated it on a stove for quite a long time? What's it called when water goes into the air?

science
of heating, filtering, evaporating, or distilling which does the best job at keeping the solvent of a solution? Please read the following web page carefully for your answer: http://en.wikipedia.org/wiki/Distilling

science
which of the following could not be reduced to a simpler piece of matter? compound, solution, element, mechanical mixture? Your exact answer is at the following site: http://www.syvum.com/cgi/online/serve.cgi/squizzes/chem/elements_compounds_mixtures.html

science
you are given three red powders all different substances of the following state crystals or colour would you use to identify the vials? of our 5 senses what is the most commmon sense we use when we identify objects?

science
what can happen to unhomogenized milk if left to stand is this an example of a mechanical mexture, solution or suspension?

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