Posts by sarah

Total # Posts: 5,963

Chemistry
Why are the hydrogen bonds of a certain molecule weaker in solution (with water as a solvent) than in a vacuum? I'm supposed to have three reasons, and so far all I can come up with is that the water lowers the activation energy required to form the bond and that the ...

Chemistry 20
Okay thank you so much. And yup you're right, methyl red is red is the only possible indicator. And yup that makes sense!

Chemistry 20
which of the following indicators would show an intermediate endpoint of color of orange: bromocresol green, methyl red, phenolphthalein or methyl violet? No clue how to do this. And what does it mean to show an intermediate endpoint. Please help

Chemistry
I've been given a table with the following information: Br-Br bonding energy (298 K): 192.807 kJ/mol Br2 vaporization energy: 30.91 kJ/mol boiling point of bromine: 332 K The question reads, "A chemist heats liquid bromine to 335K, and a gas forms. Is the change that ...

English
I'm writing a critical essay.and when we do say, mean and matter for our quote, the matter is outside of the text. So my thesis needs to be general but regarding to Macbeth's responses.

English
I'm writing a critical essay.and when we do say, mean and matter for our quote, the matter is outside of the text. So my thesis needs to be general but regarding to Macbeth's responses.

English
I need help doing a thesis for Macbeth by Shakespeare. I'm focusing on the character Macbeth and my theme is ambition. Intially: -He is shown as a loyal soldier who is kind (fill with the mill of human kindness) -He gets startled when the witches tell him his 3 prophecies...

Physics
It should be velocity, but if the question is assuming that direction doesn't matter, then the answer is probably speed. Displacement would be the area under the curve of a velocity vs time graph.

Chemistry
Just to make sure I'm on the right track here, is it correct to say that larger molecules have a higher heat of vaporization/condensation than smaller molecules? I figure that since larger molecules have stronger dispersion forces, it takes more energy for them to break ...

Chemistry
You'll want the overall charge of the compounds to be 0. For A, how can you balance +2 and -3 to make an overall charge of 0? For B, do you know how to find the charge of copper (II)? (Hint: it is in the name.)

Science
We know there are about 6.02 x 10^23 atoms in a mole, so convert the grams to moles and then multiply by Avogadro's number to find the number of atoms.

Chemistry - Liquid Methane?
"The planets Uranus and Neptune are so far from the Sun that temperatures are low enough for atmospheric methane, CH4, to condense and form clouds. How is it possible for methane, a nonpolar substance, to exist in this liquid state?" I want to say it's because ...

Chemistry
The question on one of my assignments says, "Explain why a thick layer of ice on the lake can support the weight of a person, but the liquid water cannot." I would assume it's because solids are solid and liquids are liquid, but I feel like they want a more ...

Math
A brick patio has the approximate shape of a trapezoid. The patio has 16 rows of bricks. The first row has a = 13 bricks and the 16th row has b = 28 bricks. How many bricks are in the patio?

Math
Going to bake 100 cookies. If 3 cups of flour will make 20 cookies. How much is needed for 100

Math
Never mind I got it

Math
I know that lmao I'm just looking for some help

Math
Explain It Use your design and analysis to write a website posting describing the process readers can use to make a string of pennant flags using any length string and any size square. Your posting should include the following: ? step-by-step instructions ? a formula that can ...

math
A credit card had an APR of 23.51% all of last year and compounded interest daily. What was the credit card's effective interest rate(EIR) last year? Show your work.

math
thank you

math
so in a rhombus all sides are equal ?

math
a property of rhombi that is not a property of parallelograms

math
so the answer is 9,4?

math
M(1, 7) is the midpoint of PQ¯¯¯¯¯ . The coordinates of point P are (?8, 3) . What are the coordinates of point Q?

math
THANK YOU !

math
i know that this deals with the midpoint formula and stuff like that

math
please help im really struggling Point A is located at (2, 6) and point B is located at (18, 12). What point partitions the directed line segment ? AB¯¯¯¯¯ ? into a 2:3 ratio?

History
does modern day war coverage present the same opportunity to present an interpretation of event that this artist illustration did of conflict in sudan ?why or why not?

math
an ostrich at the zoo that is 140 pounds. how many ounces does the ostrich weigh?

math
If I have a line of best fit, y = -3.0681x + 287.7095 is -3.0681 the slope? And is 387.7095 the y-intercept? And what exactly does that y-intercept mean? That's where that line crosses the y-axis?

algerbra
p=2L + 2w find L when P=24 and W=4

Spanish
Would someone be able to help me translate this into English? I'm not sure it makes sense. Tan bomba vas a ser? De donde ss Thanks in advance.

reading
Please help me

Social Studies
Why did Japan need to rebuild its economy following World War 2

math
I just want to check to make sure I am correct -- my equation is y = -x^2 + 90x - 800 If x = 100, -x^2 would be 10,000, not -10,000? Because -100 x -100 is 10,000, not -10,000 --- my calculator keeps giving me a negative number. So my overall number is 18,200

Social Studies
Yeah, you are right, you probably dont trust me, but I promise I am telling the truth. Just try it and you'll see.

Math
True

English
Really? I dont.can I get a link that shows how to format it?

English
Yes. We are allowed to write a narrative story

English
I'm supposed to be doing it on the short story pauls case. But it's supposed to be a personal response so I wanted to write a short story

English
What do these texts suggest to you about ways in which individuals pursue or compromise their happiness? Can I please get a thesis? Like a general one without including the texts. I'm having trouble figuring it out.

social studies
So it is A?

algebra
a bathtub in your home has a drain that leaks. When you fill you bathtub with 30 gallons of water you notice that after every 5 minutes you only have 20 gallons remaining, so the drain is leaking 2 gallons every minute which represents slope. what is the linear equation of the...

social studies
Whats the answer?

chemistry
Most top-loading balances used in this experiment measure a mass only to the nearest mg(+_0.001g).? This significantly affects the calculation of R in this experiment. Explain why this is so. How might the procedure be modified to compensate for this systematic error?

chemistry
What would be the effect on the calculated value of R of each of the following experimental errors? Explain each answer. a. the liquid level in the eudiometer tube is lower than that in the beaker, but this is not taken into consideration in the calculations. b. the balance ...

Trigonometry
And if I choose 4 as the radi. Then would it be: sin (315°)= y/4 4 sin (315°)= -2.8284 So that is the y value. Cos (315°) = x/4 4 cos (315°) = 2.8284 So that is the x value ?

Trigonometry
I'm having trouble doing trigonometry. Determine the possible coordinates of a terminal point for each angle in standard position. A) 315° I have no clue how to do this. Please explain and show me the work so I can do the rest of the questions myself

Algebra
What happens to the mean of a set of data if you add a constant value to each data piece?

Chemistry
So my answer is right?

Chemistry
Determine the molar concentration of sodium oxide if 3.91g of solid was added to 525mL of solution. I am not typing my entire work in but I calculated these values: V=525 ml= 0.525L N= 0.0603084866 Would it be 0.120 mol/L

Science disscussion
Really? I have been waiting all this time for this?

Science disscussion
What form of pollution, if any, does each energy source cause How does the economy influence energy source choices How does location influence energy source choices

Math
An archer shoots an row into the air such that it's height at any time, t, is given by the function h (t)= -16t^2+kt+3. If the maximum height of the arrow occurs at time t=4, what is the value of k? A) 128 B) 64 C) 8 D)4 What I did: H (t)= -16t^2+kt+3 4= -16 (4)^2+ k(4)+3 ...

literature
what method does jerry use to lie underwater on the sea floor? a. he wears swimming goggles b.he dives holding on to a big rock c.he dives past the older boys d.he counts to 115 Is it b? PLEASE HELPPP QUICK

Chemistry
Would it be SO4 2-

Chemistry
you are given two unlabelled colorless solutions: AgNO3(aq) and Ca(NO3)2. A)Which ion when added to each unlabelled solution would produce a precipitate with the calcium and silver ions? No clue what this question is asking. Can I get help?

Math
A ball is thrown from a cliff. This is modeled by the eqn h=-5t^2 +5t+210 How long does it take the ball to reach a height of 60m? I don't understand how to find this, please help.

Math
Describe the following transformations on y=x^2: y=-4(2x+10)^2 -7

Math
The population of a town is modelled by P=-0.1x^2+1.2x+4.4 where x is the number of years since the year 2000, and y is the population in thousands. a) In the year 2005, what is the population? I used the equation, put x=5 and I got 7900 as the population. b) In the year ...

Functions
Describe the following transformations on y=x^2: y=-4(2x+10)^2-7 I really don’t understand transformations, please help

Math
Round 6784 to the nearest thousand, hundred and ten

Math
A basketball is tossed from the top of a 3m wall. The path of the basketball is defined by the relation y=-x^2+2x+3 where x represent the horizontal distance travelled, in metres, and y represents the height, in metres, above the ground. A) How far has the basketball travelled...

Math
Two factory plants are making TV panels. Yesterday, Plant A produced 9000 panels. Ten percent of the panels from Plant A and 3% of the panels from Plant B were defective. How many panels did Plant B produce, if the overall percentage of defective panels from the two plants was...

GEOMETRY
What are the steps for using a compass and straightedge to construct a square?

Computer Science
You want to buy a new car, and you are thinking about two alternatives, car A and car B. You like both cars, and you are considering keeping whichever one you buy for many years to come. As a result, you want to evaluate the total cost of ownership of both cars over many years...

Computer Science
You want to buy a new car, and you are thinking about two alternatives, car A and car B. You like both cars, and you are considering keeping whichever one you buy for many years to come. As a result, you want to evaluate the total cost of ownership of both cars over many years...

Chemistry
For potential and kinetic energy when it comes to phase change, do the temperatures remain constant in one of them? I forgot which one it was. Can you help?

GEOMTRY
I REALLY NEED HELP IN THIS 2 COLUMN PROOF Complete the two-column proof. Given: is complementary to . bisects . Prove: is complementary to .

Physics
if a machine is capable of accelerating at a constant speed of +20.0m/s^2 calculate the time required for it to go from -5.00m/s to +55m/s

Chemistry
Oh okay. We didn't learn that as of now. But I'll include that into my answer.

Chemistry
Oh okay. We didn't learn that as of now. But I'll include that into my answer.

Chemistry
Is cl2 or F2 less volatile? Cl2 is less volatile because it has more intermolecular forces and therefore has a higher boiling point. Is this right?

English
Okay thank you for the help

English
What ideas does the director develop regarding the conflict between pursuing a specific desire and choosing to conform? Rewrite as a How/Why question in your own words. In my own words: What ideas does the director say about being in an internal conflict with yourself, of ...

math
Oh okay. Because what I found: The current temperature in Smalltown is 20 °F. This is 6 degrees less than twice the temperature that it was six hours ago. What was the temperature in Smalltown six hours ago? One reading at an Arctic research station showed that the ...

math
What was the temperature? Reread what you wrote because I think some information is missing or it autocorrected.

Pre-calculus
How do I factor this: 6m^2 + 7mn + n^2 I really don't understand this one

Pre-calculus
I have a really basic question. Say I have a rational expression and my numerator is 4xy. Am I allowed to factor out just the x or just the y? For example y(4x)?

Pre-calculus
Thank you! That helped me a lot and I understand it now.

Pre-calculus
Hi, How do I simplify and state the restrictions on the following: 12x^8y^9 / 3x^4y^6 what do I need to factor out? I'm so confused, I never know what I'm allowed to factor out.

Chemistry
Write a net ionic equation for the reaction that occurs when excess hydrobromic acid (aq) and sodium sulfide are combined.

Math
Would I need to add || absolute value around any variables?

Math
I'm having trouble understanding when I am supposed to add absolute values when simplifying radicals. (It's cube root not square root) XER and YER because it's a cube root and you can take cube root of negatives and positives. ?-108x^7y^9 = ?-27•4•x^6&#...

Math
Evaluate : -5|1-3|+4|3-1| -5|-2|+4|2| -5 (2)+4 (2) -10+8 -2 Is this right?

Math
Factor: 50 (2x-5)^2 -162 (3y-2)^2 I'm not even sure how to do this. I've tried it for so long and I've been trying multiple ways. I don't know how to factor these. May I get a step to step explanation or work please?

science
c6h12o6(aq)+6o2(g)->6co2(g)+6h2o(l) ?h=-2820kj c2h5oh(aq)+3o2(g)->2co2(g)+3h2o(l) ?h=-1380kj hitunglah reaksi c6h12o6(aq)->2c2h5oh(aq)+2co2(g)

Math
Oh never mind. I realized my mistake. It was 4 1/4 in the question but I accidentally changed it to 1 1/4. Thank you so much for the help though

Math
I've tried that. And I either get |-5.75| or I get 5.75 which are the same thing

Math
Use absolute value to determine the distance between the two numbers. -3.5 and 4 1/4 |-3.5- 1 1/4| |-3.5- 9/4| |-3.5/1 - 9/4| |-14/4 - 9/4| |-23/4| 23/4 5.75 I got 5.75 as my answer. But why does my answer key show 7.75 units? I'm not sure what I did wrong. I've double...

Social studies
2: How might the Iroquois have been helpful in assisting the British troops in the surprise attack? a- the Iroquois likely had better knowledge of the area and could lead the British troops through the woods b- the Iroquois likely had better knowledge of the habits of the ...

math
A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 18° with the horizontal. The flagpole casts a 14-meter shadow up the slope when the angle of elevation from the tip of the shadow to the sun is 21°. (b) Write an equation ...

chemistry
What is the change in ph after addition of 10.0 ml of 1.0 m sodium hydroxide to 90.0 ml of a 1.0 m nh3/1.0 m nh4+ buffer? [kb for ammonia is 1.8 x 10-5]?

chemistry
Methane (CH4) is the main component of natural gas. It is burned for fuel in a combustion reaction. The unbalanced combustion reaction for methane is shown below. CH4 + O2 CO2 + H2O + heat When the reaction is balanced, how many carbon dioxide molecules are produced for every ...

chemistry
What is the pH of a weak acid solution that has an [H*] of 2.1×10^6 M?

Math_ Geometry
The sum of the interior angles of a regular polygon equals 1260 degrees. How many sides does a polygon have?

Physics
A person runs off a cliff. The person runs with a speed of 10 m/s and is moving to the right as he leaves the cliff. The cliff is 13 meters above a pool of water. a) Determine the acceleration of the person after leaving the cliff (x and y components). b) Determine the time it...

college history
What were the events in Germany, Russia, and Ireland after World War I? My history textbook does not discuss the question at all. Please help. I need to know the answers in preparation for the test I have tomorrow. Thank you.

Econ Online
market competition pushed a price down toward its market-clearing level. Which of the following BEST describes they type of competition that would cause lower prices 1) Competition between buyers and sellers 2) Competition among sellers 3) Competition among buyers 4) ...

Econ
explain the economic effects of a price floor at $8. Be sure to reference quantity, shortage or surplus, etc.

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