# Posts by alex

Total # Posts: 3,724

**CHEMISTRY !!! HELP !**

I really wish I knew the answer and I would've tried to work my way around but unfortunately I don't. My teacher didn't teach me how to do these calculations and I'm doing online Hw. Thanks for your help ! I'll post the answer if I get it right.

**CHEMISTRY !!! HELP !**

K1*K2=(x^2*.0226)/.0158=.0000671 Which results in pH being 4.17 But it seems that my answer is still wrong. An i missing something ?

**CHEMISTRY !!! HELP !**

I tried with both of them but the answer was still wrong.

**CHEMISTRY !!! HELP !**

A solution containing 0.0158 M maleic acid and 0.0226 M disodium maleate. The Ka values for maleic acid are 1.20 × 10-2 (Ka1) and 5.37 × 10-7 (Ka2). What is the pH of the solution ?

**Chemistry 101**

I'm not sure but isn't there supposed to be specific heat involved in there ? (Sorry if it's a silly question, but i'm still a high school student)

**Chemistry**

A solution containing 0.0158 M maleic acid and 0.0226 M disodium maleate. The Ka values for maleic acid are 1.20 × 10-2 (Ka1) and 5.37 × 10-7 (Ka2). What is the pH of the solution ?

**chemistry**

I'm just an ordinary student like you so I might be wrong but it's H2O x Specific heat(2.09 J/g⋅C) x delta T x stands for multiplication and delta T is change in temperature

**Math**

I believe that is the correct answer

**Physics**

A Formula 1 car it heading for a straight piece of track which is 500m long. He is travelling at 220km/h. How long will he take to cover this amount of track? Time = Distance / Speed I'm confused as I don't know whether to change the distance to equal the speed's ...

**Geometry**

A design on the surface of a balloon is 5 cm wide when the balloon holds 71 cm of air. How much air does the balloon hold when the design is 10 cm wide? Explain the method you use to find the amount of air.

**Geometry**

The equation (x + 5) + (y + 3) = 169 models the position and range of the source of a radio signal. Describe the position of the source and the range of the signals.

**Math**

The equation (x + 5) + (y + 3) = 169 models the position and range of the source of a radio signal. Describe the position of the source and the range of the signals. How would I explain it?

**History**

Suspicion had always troubled the relationship between the Western powers and the Soviets. The Soviets didn't trust the West in anything, especially Stalin, though he gave them reasons that they couldn't trust him, either, when his armies began gobbling up Eastern ...

**History**

What factors led the wartime alliance between the United States and the Soviet Union to disintegrate into the Cold War? What would be a great short answer?

**Chemistry**

When 1.63 g sample of an unknown hydrocarbon is completely burned in oxygen, 4.97 g of CO2 are produced. What is the percentage by mass of hydrogen in this hydrocarbon? THANK YOUU Found out the formula: 4CH+5O2--> 4CO2+2H2O then found out the moles of CH= 0.1251 I don't...

**Cemistry**

refrigerator and window

**Math**

At a track meet, 50 people ran the 100-meter dash. 2 people finished in 11 seconds, 5 people finished in 12 seconds, 8 people finished in 13 seconds, 10 people finished in 14 seconds, 21 people finished in 15 seconds, 2 people finished in 16 seconds, and 2 people finished in ...

**Math**

Janine wants to paint just the sides of a cylindrical pottery vase that has a height of 45 cm and a diameter of 14 cm. To the nearest whole number, find the number of square centimeters she will need to paint. Explain the method you would use to find the lateral area.

**Math**

An hourglass, composed of two identical cones, is 12 cm tall. The radius of each cone is 3 cm. If you want to fill the bottom half of the hourglass full of salt, how much salt will you need? Explain the method you would use to find the amount of salt.

**Chemistry**

Calculate the number of moles of carbon atoms present in 2.2 g of ethanol (C2H6O). For this question, I would just need to find the molar mass of carbon, right? Not the molar mass of all of ethanol? So it would just be 2.2 g/ 24.02 g/mol which would equal .092. It wouldn't...

**Math 9th Grade**

Write an expression for the distance a car travels in t hours at a speed of s km/h

**Physics**

A person exerts a force of 90 N on a rope that pulls a sled across a very smooth surface. The rope is oriented 37∘ above the horizontal. The sled has a total mass of 40 kg . The sled starts at rest and moves for 10 m.

**Physics-Trajectory**

x =(1/2t^3?2t^2)m and y =(1/2t^2?2t)m

**Physics-Trajectory**

B. 17.75 Because sqrt([3/ 2 t^2 - 4t]^2 + [t - 2]^2).

**Physics-Trajectory**

A. v=2m/s C. -90

**ap calculus**

((1/-2-h)-1)/h

**Math**

if a bullet travels at 645.0m/s, what is its speed in miles per hour? can you please show me how to solve this?

**Chemistry**

Round each number to two significant figures: 233.356 0.002353 1.005 Can you please show me and explain how to do this? Im confused. thank you!!!

**Math**

A triangle has side lengths 10, 15, and 7. Is the triangle acute, obtuse, or right? Show your work and explain. I think it's gonna be an obtuse and maybe right....might be wrong...

**Chemistry**

Hi! I really really need help in this question: what observation is expected when: 1. an acid (nitric acid, HNO3) is added to a solution containing carbonate or bicarbonate ions? 2. silver ion is added to a solution containing chloride (or bromide or iodide) ions? Please help ...

**probability**

thanks Reiny, the buttons were pushed

**probability**

Two hunters shoot at the same duck. The probability of the first hunter hitting the duck is 0.2. The probability of the second hunter hitting the duck is 0.75. Hitting the duck results in its death. What is the probability of the duck being killed?

**probability**

A survey asks people about their reading habits with respect to three newspapers. The results show that 56% read newspaper A, 33% read newspaper B, and 27% read newspapers C. 7% of the respondents read newspapers A and B, 8% of the respondents read newspapers B and C, 11% of ...

**Chemistry- PLEASE HELP**

Hi! I really really need help in this question: what observation is expected when: 1. an acid (nitric acid, HNO3) is added to a solution containing carbonate or bicarbonate ions? 2. silver ion is added to a solution containing chloride (or bromide or iodide) ions? Please help ...

**CHEMISTRY**

i meant Pb304…sorry, my mistake

**microeconomics**

Budget constraint 1 is faced when price food = 10 and price clothing = 5. Budget constraint 2 is faced when pfood = 40/7 and pclothing = 10. The income is 100 for both budget constraints. Draw both budget constraints. Next, draw the following four consumption bundles in your ...

**English: Amoretti LXXV: One Day I Wrote Her Name**

What are three questions asked in this sonnet. If you can help great! If not that's fine

**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.09 m/s. The car is a distance d away. The bear is 20.9 m behind the tourist and running at 6.04 m/s. The tourist reaches the car safely. What is the maximum possible value for ...

**microeconomics**

Save Open Spaces (SOS) is a non-profit organization that promotes protection of undeveloped land. They perform two primary activities: purchasing undeveloped land for preservation and lobbying Congress for additional protection for undeveloped land. SOS has a budget of $600,...

**microeconomics**

Mickey is very picky and insists that his mom makes his breakfast with equal parts of cereal and apple juice. Any other combination ends up on the floor. Cereal costs 4 cents per tablespoon and apple juice costs 6 cents per tablespoon. If his mom budgets $8 per month for his ...

**Physics**

In a cathode ray tube, a beam of electrons is injected horizontally into the exact center of the parallel-plate region. Here L = 3.0 cm and d = 0.20 cm. The top plate has a surface charge density of σ0 = +0.15 μC / m2, and the bottom plate has a surface charge ...

**Physics**

Inside a metal conductor, why is it not possible to have a static charge configuration if there is a net electric field?

**american history**

That link doesn't have a specific site ...it brings out google ...

**american history**

Did the Watergate scandal have any lasting effects on the nation? Explain.

**american history**

What factors led the wartime alliance between the United States and the Soviet Union to disintegrate into the Cold War?

**american history**

What were the key aspects of Lyndon B. Johnson’s Great Society?

**american history**

What factors led the wartime alliance between the United States and the Soviet Union to disintegrate into the Cold War?

**american history**

How did the New Deal affect women, African Americans, and Native Americans?

**american history**

What were the causes of World War I?

**Math**

If Ms. Herbert gives her class a English quiz every 6 days any math quiz every 10 days when is the first day there will be a math and English quiz on the same day

**american history**

What was factory work like in the late 1800's?

**american history**

How did the spoils system affect politics during the Gilded Age?

**american history**

I'm still confused

**american history**

In the 1812-1860

**american history**

What arguments did supporters of the public school movement make to support their cause?

**american history**

Why did so many colonists protest the Stamp Act?

**Chemistry**

In chemical analysis, it is often necessary to prepare a solution by diluting a stock solution.Calculate how much of a 5.337M NaOH is needed to make 1.669 liters of a 0.063M sodium hydroxide solution. (Remember to include units.)

**Chemistry**

To determine the concentration of 10.31mL of an unknown solution of a monoprotic acid, it is titrated with 0.172M sodium hydroxide. The initial reading on the buret of sodium hydroxide is 2.19mL. The final reading is 13.41mL. What is the concentration of the unknown acid?

**Social studies**

Mayan priests interest in astronomy led to the creation of ____. A. a 365-day calendar B. A book of rules C. Human sacrifices D. Cave paintings Which one is correct ? Please help

**Physics**

19. A track consists of a frictionless incline plane, which is a height of 0.5 m, and a rough horizontal section with a coefficient of kinetic friction 0.02. Block A, whose mass is1.5 kg, is released from the top of the incline plane, slides down and collides instantaneously ...

**Algebra**

You invested 20,000 in two accounts paying 4% and 7% annual interest, respectively. If the total interested earned for the year was $830, how much was invested at each rate?

**Art**

Would it be space?

**Art**

1. In the image, Green Wheat Fields, Auvers by Vincent van Gogh, which of the following elements was not used to create the principle of harmony? A. Colors B. Form C. Line D. Texture 3. In the image, The Annunciation, by Jan van Eyck, which element in this image creates ...

**pre-calculus urgent**

Please help me here as well to clarify more my understanding. Let a1, a2, a3, . . . be a geometric sequence with initial term a and common ratio r. Show that a1^2, a2^2, a3^2, . . . is also a geometric sequence by finding its common ratio. Given that the ratio for a1, a2, a3...

**pre-calculus urgent**

The first term of an arithmetic sequence is 6, and the tenth term is 2. (a) Find the common difference d. d = Find the 100th term of the sequence. a100 = (b) Find the partial sum of the first ten terms. S10 = how do i do this, there's an example I tried following but it ...

**Math**

Drew is twice as old as his sister joy.The quotient of their ages five years ago is seven less than Joy's present age. Find out how old they are at present.

**Algebra**

m+7/m^2+4m-21

**Chemistry**

Why is the rate determining step the slowest step?

**American History**

What caused the King Philip's war? Can you briefly explain or send me some links to sites.

**Business**

Unions have a substantial impact on the compensation and work lives of both unionized and non-unionized workers. Unions raise wages of unionized workers by roughly 20% and raise compensation, including both wages and benefits, by about 28%. Unions reduce wage inequality ...

**personal finance**

You purchase a car $22,000. The interest rate is 5% and you decide to pay over a period of 5 years. What is your payment?

**physics**

You push against a steamer trunk at an angle of 33° with the horizontal . The trunk is on a flat floor and the coefficient of static friction between the trunk and floor is 0.55. The mass of the trunk is 43 kg. What is the minimum magnitude of force that will allow you to ...

**Public speaking**

Saying "gonna" instead of "going to" is an issue of: A. Body movement B. Eye contact C. Articulation D. Timing

**Physics**

A projectile of mass 0.636 kg is shot from a cannon, at height 6.6 m, as shown in the figure, with an initial velocity vi having a horizontal component of 6.8 m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel and strikes the ...

**Physics**

Three blocks of mass 10kg, 20kg, 15kg respectively are being pushed in a row on along a horizontal surface with constant velocity by a force applied to the 10kg block.The coefficient of kinetic friction between each of the blocks and the surface is 0.18. What is the magnitude ...

**physics**

A jetliner is traveling east from Seattle to Chicago, a distance of 1,750 miles. The jetliner travels at an average air speed of 620 mph relative to the air. At the jetliner's altitude, the wind is blowing 46 mph to the east. How long does the journey take?

**physics**

An astronaut in a spacecraft looks out her window and observes a comet travel in the opposite direction at a relative speed of 237 m/s. The velocity of the spacecraft is 114 m/s directly away from the sun. What is the comet's velocity relative to the sun? Assume that ...

**physics**

A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration

**physics**

Hot air balloon A is rising upward a rate of 5.0 m/s. A passenger aboard balloon A observes balloon B rising upward at a relative rate of 7.5 m/s. What is the velocity of balloon B relative to the ground? Assume that up is positive.

**physics**

A test rocket is fired straight up from rest. The net acceleration is 20 m/s2 upward and continues for 4.0 seconds, at which time the rocket engines cease firing. What maximum elevation does the rocket reach?

**Calculus**

So don't write cos x = 0 and sin x = 0 ?

**Calculus**

Okay

**Calculus**

Yes, so what work do I need to show how I got a Absolute Maximum at pi/2 and 3pi/2

**Calculus**

To show how I got the answer, is the work sufficient? f(x)= sin^2(x) f'(x)=2sinx(cosx) = cosx(2sinx) cosx=0 sinx=0 f(0)=0 f(pi)=0 f(pi/2)=1 f(3pi/2)=1 Absolute Maximum is at pi/2 and 3pi/2

**Calculus**

On the closed interval, [0, 2*pi], find the absolute maximum of the function f(x)= sin^2(x)

**Calculus**

-3/2 feet per minute I meant

**Calculus**

Is this right? 1.5 ft = dr/dt 2x dx/dt + 2y dy/dt = 0 2(18)(2) + 2(24)= 0 72 + 48 dy/dt = 0 48 dy/dt = -72 dy/dt = -72/48 = -3/4 feet per minute

**Calculus**

36 dx/dt + 48 dy/dt = 0 48 dy/dt = -36 dx/dt dy/dt = -.75 or -3/4

**Calculus**

So what's next to find the rate at which the ladder is moving toward the building when it is 18 ft from the wall?

**Calculus**

A ladder 30 ft. long is leaning up against a building. If the top of the ladder is being pulled up the wall of the building at a rate of 1.5 feet per minute, find the rate at which the base of the ladder is moving toward the building when it is 18 feet from the wall.

**French, foreign languages**

Hi the following sentences are basically unscrambling them in the first place and then putting the sentence in order. If when looking through my unscrambled sentences and you see something wrong with the grammar or something of that nature that does not make the sentence ...

**French, foreign languages**

Hi, This are my answers using verbs from a list provided in the assignment in the future. If something within the sentences or if I have used a verb wrong please let me know and if possible tell me a correction I can make to make it more understandable or more grammatically ...

**French, foreign languages**

I need help understanding the present subjunctive in French and also the usage of Il faut in said sentence

**Math**

Byron’s house has a roof with dimensions shown. (Roof: 1m Height, 7m Hypotenuses, 12m length) He knows that the average rainfall in his suburb is 30cm per year. Byron would like to install a cylindrical rainwater tank to hold the water that runs off the roof. The tank is ...

**French, foreign languages**

I need help completing an assignment that includes completing sentences from a reading. T The questions have my answers within them to complete the sentence. Once you have read the the questions with my answers within the questions and you see something wrong with my answers ...

**MWS**

:)

**MWS**

well then that can be the answer thxs

**MWS**

First i thought it was new companies and now i have second thought i think it is now trade organizations what do you think

**MWS**

In recent times, Latin American countries have tried to improve their economies by forming these. Need help

**French, foreign languages**

Hi, Can you please check my sentences to see if I have the used verbs that are in the conditional correctly and also if they do not make sense tell me what I did wrong and if possible tell me what corrections I should make. Here are my sentences and the questions: Dans un ...