# Posts by Erin

Total # Posts: 696

**Chemistry**

If a 11.0 mL sample of vinegar (aqueous acetic acid ) requires 19.0 mL of 0.500 M NaOH to reach the endpoint, what is the original molarity of the acetic acid solution?

**Physics**

A roller coaster travels 29.1 m at an angle of 34.0 above the horizontal. How far does it move horizontally?

**Physics**

A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 38.8 m/s. At the same time, it has a horizontal velocity of 54.3 m/s.At what speed does the vehicle move along its descent path

**Chemistry**

Calculate the number of carbon atoms in 0.75 L of acetone (CH3COCH3). (density=1.3g/mL and boiling point=48.5 degrees)

**Can you help me make my thesis sound clear & good**

In the short story, "how much land does a man need," the author Leo Tolstoy would describe that human worth based on shallow measurements such as wealth and possessions make true love and humanity impossible because of greediness, the devil filling our minds with ...

**Algebra 2**

x+2y+5z=-1 2x-y+z=z 3x+4y-4z=14 solve the system using linear combination method.

**english/essay writing help**

Hello! So Im having trouble with my thesis statement for an essay. My teacher gave us three questions to answer and make the answers into a thesis statement. heres the questions and instructions: Does defining human worth based on shallow measurements, such as wealth and ...

**chemistry**

a glass jar containing .27 mol of Nitrogen with a leaky lid is heated from room temperature 22 celcis to 150 celcis. How many moles of Nitrogen remain? How many gtams?

**Chemistry**

What mass (g) of KHP is required to neutralize 10.00 mL of 0.1092 M NaOH?

**Chemistry**

How many mL of the 0.1029 M standard NaOH solution is required to titrate 0.2247 g sample of KHP to the phenolphthalein end point?

**Chemistry**

What mass of NaOH is required to prepare 500.0 mL of 0.1029 M stock solution?

**chemistry**

How many grams of Kl are required to prepare 500 mL of 0.04 M Kl?

**Chemistry**

A bottle of wine contains 11.4% ethanol by volume. The density of ethanol (C2H5OH) is 0.789 g/cm3. Calculate the concentration of ethanol in wine in terms of mass percent and molality.

**Chemistry**

density of water and the antifreezer is 0.9975 g/mL and 1.141 g/mL I got molality of 54.5 and molar mass 18.33g.

**math**

how to solve 2x-9/3=8-3x

**Social Studies**

mexico,canada,U.S

**math**

thnx

**math**

how do you solve 4(3d-2)=8d-5

**Math**

ask your teacher for tutoring or find out if there are any tutoring classes in ur school. (good luck)

**Biology**

Down syndrome or trisomy 21, in humans is caused by an extra copy of relatively small chromosome 21. if a male with down syndrome could have children what is the likelihood that his children will also have down syndrome? a. 0 b. 25 c.50 d. 75 e. 100

**English**

Thank you Ms. Sue!

**English**

Could you help me find the "simple subject" and "simple predicate" in the following sentence please? "It is going to rain tomorrow." Thank you!

**Math**

The area of a square is 10 square meter. what is the product of the lengths of the diagonals of the square?

**math problem**

I have to find the area of a 14 yd square...the answer is the number plus the units squared

**physics**

A 9.1 g ball is hit into a 98 g block of clay at rest on a level surface. After impact, the block slides 8.0 m before coming to rest. If the coefficient of friction is 0.60, determine the speed of the ball before impact.

**trigonometry**

an automobile tire has a diameter of 36 inch.how many revolution will the wheel make an arc the automobile travels 1 mile (5280 A)?

**chemistry**

I am given the concentration of HClO4 and a pressure for H2... how do i plug either of the givens into the equation youve shown??

**chemistry**

calculate the reduction potential for hydrogen ion in a system having a perchloric acid concentration of 2.00 x 10^-4 M and a hydrogen pressure of 2.50 atm.

**chemistry**

will fe3+ oxidize Sn2+ to Sn4+ in acidic solution?

**chemistry**

the time is supposed to be 4.6 hours. i am not having problems getting the mass of Cu, i am just struggling with how to find how long it will take.

**chemistry**

i get 4.76 x 10^-5 mol CaC2o4.. squaring the answer gives me a ksp= 2 x 10^-9 is this right?

**chemistry**

a liter of a solution saturated at 25C with CaC2O4 is evaporated to dryness giving a 0.0061 gm residue of CaC2O4. Calculate the concentrations of the ions, and the molar solubility and the solubility product constant for this salt at 25C. Show the balanced reaction.

**Elementary Statistics**

1) Construct a confidence interval of the population proportion at the given level of confidence. x=60,n=300, 99% confidence. The 99% confidence interval is (_,_) 2) A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size sample ...

**World History**

Who ruled the Byzantine Empire?

**Chemistry**

Ammonia reacts with oxygen at 120 C to form NO and H20 in a sealed 40-L container. When 34 g of ammonia reacts with 96 g of oxygen, what is the partial pressure of the NO? What is the total pressure?

**English**

Well, Jacob, the deal is that this student is obviously enrolled in a K12, Inc school, and therefore, has a teacher who she could've contacted. Many times, the answers that students get from these sites are TOTALLY off. I'd rather the student come to a teacher (like me...

**English**

Thank you, Writeacher! This question comes from online schools affiliated with K12. I am constantly finding students who use these sites to copy answers. Liz, did you ever think of reading the lessons the school provides or of contacting your instructor?

**Math**

What is the x-coordinate of the image of P(5,11) under R-0,90*-?

**Math**

What are the coordinates of the image of the point P(4,25) under R-o, 180*-, where O is the origin?

**Math**

Consider the points P(20, 20), X(a,b) and Y(a+20, b+20). Is Y=T-op-(X), where Ois the origin. explain

**Math**

Find the image of the point P(-11, -34) after 6 successive half turns about the point C(-11, 0)

**Math**

The image of the point P(-38, 127) when reflected over the line y=x is...

**Trig**

i dot geht thhis werlk? cahn sumwone elp meh?

**Chemistry**

31 mL benzoate and 69 mL benzoic acid

**Physics**

A bullet of mass 0.06kg is fired horizontally with a muzzle speed of 700 m/s into a pendulums hanging block of mass 2.0kg. The block and the bullet then move up a height, h, above the pendulums equilibrium position. What is the speed of the bullet/block combination after the ...

**algebra..**

Thank you so much !

**algebra..**

Write an aquation in standad form that satisfies the given conditions: Paralled to the x-axis and through ( 4, -1)

**chemistry**

How do you do the hybridization of CBr4?

**physical science**

In raising a 5000-N piano with a pulley system, the movers note that, for every 2m of rope pulled down, the piano rises 0.3m. Ideally, show that the force required to lift the piano is 500-N.

**Algebra**

You operate a gaming Web site, where users must pay a small fee to log on. When you charged $3 the demand was 520 log-ons per month. When you lowered the price to $2.50, the demand increased to 780 log-ons per month. (a) Construct a linear demand function for your Web site and...

**Algebra 2**

You are cooking chili. When you take it off the stove, it has a temperature of 205°F. The room temperature is 68°F and the cooling rate of the chili is r = 0.03. How long will it take to cool to a serving temperature of 95°F

**Math**

1 bounce=32 2 bounce=16 3 bounce=8 4 bounce=4 5 bounce=2 6 bbounce=1

**English**

When there is change in reactant, product, or temperature the equilibrium position will shift in a direction that tends to decrease change in this situation. When the concentration of one of the products of an equilibrium reaction is higher than the other, then the solution ...

**Geometry Are these two triangles similar? Thanks!**

ya

**Physics**

500 J

**physics 213**

Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 44.7 km/s and 56.2 km/s. The slower planet's orbital period is 8.61 years. (a) What is the mass of the star? (b) What ...

**math 12**

The world's population is 1970 was about 3.6 billion. If the population has increased at 2% each year since then, what will the world's population be in 2010?

**physics 213**

A duck has a mass of 2.80 kg. As the duck paddles, a force of 0.120 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.190 N in a direction of 48.0 ° south of east. When these forces begin to act, the velocity of the duck is 0....

**physics**

During a circus performance, a 74.8-kg human cannonball is shot out of a 18.0-m-long cannon. If the human cannonball spends 0.844 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.

**Pre-Algebra**

Help! I am not really good with story problems! Forest rangers measure a depth of 82" of snow on a mountain peak at 8am. Snow is expected to fall at a steady rate of 3/4" per hour throughout the day. A) write an equation that approximates the depth of 'y' of ...

**physics**

In the javelin throw at a track-and-field event, the javelin is launched at a speed of 35.0 m/s at an angle of 33.7 ° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is ...

**Physics**

Relative to the ground, a car has a velocity of 14.8 m/s, directed due north. Relative to this car, a truck has a velocity of 24.0 m/s, directed 52.0° north of east. What is the magnitude of the truck's velocity relative to the ground?

**Math**

What is the range of y= -(x-2)^2+2 ?

**english**

What do you know about the fact? I have to write a research paper about Genocide. It must have a body and conclusion

**math**

16b to the 8th power + 40b to the 7th power + 25b to the 6th power

**science**

Why are proteins necessary in your body? What are polymers that build up to make proteins?

**Algebra 2**

How would you graphy this question and also solve for the intercepts: y=2(x-3)^2-1

**science-biology**

it is a recessive gene

**Physics 12**

An alpha particle is accelerated by a voltage of 1.53*10^3 V and is then deflected by a magnetic field of strength 0.020 T into a circular path of radius 0.40 m. If the alpha particles have a charge of 3.2*10^-19 C, what is their mass?

**chemistry**

how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?

**biotech**

how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?

**Calculus**

That is wrong^ av=11-2/3= 9/3=3

**college math**

use long division 1.2x3+3x2-17x+1 /x-2 2.y3+3y2+1 /y-2 3.n5-n2 /n2-n

**Chemistry**

it means Potassium hydrogen phthalate does not absorb water

**7th Math**

add 12 16 and 18. then find the LCD of 3/4 and 1/2. the LCD would be 4. hope this helps!

**Math :(**

jerome and tyler meet in the local pizza parlor after their saturday afternoon soccer game. Eash boy bought a separete pizza with an agreement to share with each other, both at the restraunt and in what they would each take home. jerome ate 1/4 of a pizza and Tyler at 2/3 of a...

**English**

Lord of the Flies Question Describe how the boys have fun as explorers. (p. 25-26) Who becomes the chief and how is this determined?

**English**

Lord of the Flies Questions 3.)What does Piggy believe has happened back home in England? 4.What does Piggy want to do now that they're on the island? 7.What happened when the conch was blown? (p. 17)

**Spanish**

The problem is: Que talla usar/usara/usaro Pedro? Does usar get affected by the subject or any ol noun?

**Physics**

Physics Help... Applying Newtons Laws Grade 11? On the surface of the earth a geological hammer has a mass of 1500g. Determine its mass and weight on Mars where g=3.6 m/s^2.

**Physics**

A 10 m long frictionless ramp is inclined at an angle of 30 degress to the horizontal. A boy of mass 57 kg coasts down the incline on a skateboard of mass 3.0 kg. The acceleration due to gravity may be taken as 9.8 m/s^2 and the effects of air resistance can be ignored. a) ...

**Science**

In drosophila , short wings , and black colour are reccessive traits.long wings and grey colour are dominant. show the cross results between a short winged , heterozygous grey fly and a heterzygous long winged grey fly

**Math( help please ! )**

determine the maximum or the minimum of a)2x^2+12x

**Math( help please ! )**

The profit p(x) of a cosmetics company , in thousands of dollars . is given by p(x) =-5t^2=400x-2550, where x is the amount spent on advertising in thousands of dollars a) determine the maximum profit the company can make b) dtermine the amount spent on advertising that will ...

**Math( help please ! )**

The height of a ball thrown vertically upward from a rooftop is modelled by h(t)=-5t^2=20t=50, where h(t) is the ball's height above the gorund,in meters, at time t seconds after the throw a) determine the maximum height of the ball b) how long does it take for the ball to...

**geometry**

Suppose the parallelogram shown has angles defined by the following expressions: angle A = 6x + 19; angle B = 3x - 21; angle C = 6x + 19; and angle D = 3x - 21? What is the measure of the largest angle?

**Art Appreciation**

ok thank you

**Art Appreciation**

I do not understand it.

**Art Appreciation**

Visit the following Web sites and explore the collections of Ancient Art there: The Metropolitan Museum of Art The Louvre Museum The Smithsonian Institution Freer Gallery and Sackler Gallery See the Course Materials List for access to these sites. From the gallery Web sites ...

**geometry**

Suppose the parallelogram shown has angles defined by the following expressions: angle A = 6x + 19; angle B = 3x - 21; angle C = 6x + 19; and angle D = 3x - 21? What is the measure of the largest angle?

**chemistry**

A student found that there are 115 drops of glacial acetic acid in 2.00 mL. Calculate the number of drops of glacial acetic acid, HC2H3O2 required to make 225 mL of 0.1 M acetic acid solution

**Math( please help)**

determine the maximum or the minimum value for each a)y=2x^2+12 b)y=-3x^2-12x+15 c)3x(x-2)+5

**Biology( HELP PLEASE)**

give the two possible alleles in the eggs produced by a women whose genotype is JjKkLl

**Math ( any help would be great!)**

Thankss !!

**Math ( any help would be great!)**

a ball is kicked in the air from the top of a cliff , the path that the ball travels is given by the equation h(t)=-5t^2+17t+22, where h(t) is the height given in meters and t is the time seconds. a) how high is the cliff ? b)what is the maximum height the ball reaches ? c)...

**Physics**

two students are attempting to lift a sign to the top of a tall building, each is pulling equally with 100 newtons of force, on the two ropes. The ropes are attached to opposit corners of the sign, and the angle between them is 60. compute the resultant force.

**ALGEBRA 1 HONORS**

im suppose to find the slope and y-intercept.

**ALGEBRA 1 HONORS**

whats the answer to x+4=4y

**Physics**

A passenger walks from one side of a ferry to the other as it approaches a dock. If the passenger's velocity is 1.50 m/s due north relative to the ferry, and 4.50 m/s at an angle of 30.0* west of north relative to the water, what are the direction and magnitude of the ...

**physics**

There are two blocks connected by a string and tied to a wall on an incline. The mass of the lower block is 1.0kg; the mass of the upper block is 2.0kg. Given that the angle of the incline is 31*, find the tension in (a) the string connecting the two blocks and (b) the string ...