# Posts by alex

Total # Posts: 3,761

**Science**

Hot water has a higher density then cold water

**organic chem**

Predict the major substitution and elimination products for butane with a Ph atom and a I atom on the 2nd carbon when added with methanol and heat. iupac name of the structure if it had carbon atoms I think is 2 dimethyl butane

**Chemistry**

A sample of gas in a cylinder of volume 3.64 L at 275 K and 2.68 atm expands to 7.04 L by two different pathways. Path A is an isothermal, reversible expansion. Calculate the work for Path A. Answer in units of J What I did was basically W=-P(delta V) Which was -(2.68 atm)(3.4...

**physics help**

A block Q Of mass 70 kg is at rest on a table it is connected to block P By means two light inextensible strings knotted at S .A Third string is arranged in such a way that the string connecting block Q is horizontal. Calculate the maximum weight of block P for which block Q ...

**algebra**

Sal's Sandwich Shop sells wraps and sandwiches as part of its lunch specials. The profit on every sandwich is $2 and the profit on every wrap is $3. Sal made a profit of $1,470 from lunch specials last month. The equation 2x + 3y = 1,470 represents Sal's profits last ...

**math**

How much work is done when a 25 N block of wood is lifted 2.2 meters?

**General Chemistry**

A 0.179 g sample of a vitamin C tablet was titrated with 0.1000 M NaOH according to the procedure in this experiment. The titration required 7.08 mL of NaOH solution. How many moles of NaOH were used in the titration?

**Chemistry**

We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true or false. So the ...

**Chemistry**

So would it be Cu + 2Cu+ = Cu2+ + 2Cu? I didn't change the electrons before for the half reaction.

**Chemistry**

Write the half reactions and the balanced equation for the galvanic cell Cu(s)| Cu2+(aq)|| Cu+(aq)| Cu(s). What is the smallest possible integer coefficient of Cu2+(aq) in the combined balanced equation? When put together the balanced equation is just Cu + Cu+ = Cu2+ + Cu. So ...

**Programming**

MyGoods sells Laptop, Printer, VGA cable and HDMI cable. The prices are as below: Items Price (RM) Laptop 2500.00 Printer 450.80 VGA Cable 20.65 HDMI cable 80.20 Write a program that allows the user to enter the total of item they wish to buy for each item. The program then ...

**math**

Find 1/8 of 12. Express your answer in simplest form.

**Statistics**

Thank You

**Statistics**

1. If P(A) = 0.4 P(B) = 0.2 and P(A or B) = 0.5, find the sum of P(A and B) and P(A|B). -How would I even start this question? 2. Let A and B be two mutually exclusive events for which P(A) = 0.15 and P(B) = 0.3. Find P(A and B). -If it's mutually exclusive, wouldn't ...

**Biology**

Is the oval window soft or hard? Explain the advantage to your answer Personally I think it's soft and it's because being soft would it to be amplified to the ear hear things more clearly. Explain why a person with a sore throat may end up with a mild ear infection. I ...

**physics**

An athlete executing a long jump leaves the ground at a 28.9 ∘ angle and travels 7.70 m .What was the takeoff speed?If this speed were increased by just 4.0%, how much longer would the jump be?

**social studies**

how did chief pontiac unit the native americans in the great lake region

**science**

1.the modern atomic model includes orbiting the nucleus. which of the following parts of dalton's was disproved by the discovery of the electron atoms are tiny particles atoms cannot be divided into smaller parts atoms have specific mass and size atoms have specific ...

**segi college**

Do you think that southwest actions are consistent with its mission?explain ways in which the firms action are consistent or inconsistent with its mission

**chemistery**

at 20 degree Celsius, 65.2 g of KBr will dissolve in 100 g of water. what is the mass percent of KBr in water ?

**English 30-1**

What is the theme of Home Place by Guy Vanderhaeghe?

**Algebra II**

Hi, can someone please explain how to graph piece wise functions to me? I am extremely confused. Ex.: -x+3, if x<2

**algebra**

jon rented a car from a company that charged a daily rental fee and a mileage charge. He rented the car for 9 days and drove 300 miles and was charged $315. His friend Amanda later rented the same car for 5 days and drive 240 miles and was charged $186. What was the daily ...

**Math**

Write an expression: The quotient of a number h and 3 decreased by 2. Would you write it like this: h/3-2

**Gen Chem**

:(

**Gen Chem**

Predict products and balance equations for the reactants shown. Pb 2+(aq) + H2PO4 1-(aq)--->? Pb 2+(aq) + HPO4 2-(aq)--->? Pb 2+(aq) + PO4 3-(aq)---->?

**math**

what is 7 to the 6th power divided by 7 to the first power.

**math**

Find each quotient. Express using positive exponents: 7 to the 6th power over 7

**probability**

The state of Ohio has several statewide lottery options. One is the Pick 3 game in which you pick one of the 1000 three-digit numbers between 000 and 999. The lottery selects a three-digit number at random. With a bet of $1, you win $500 if your number is selected and nothing...

**Chemistry**

Thank you!

**Chemistry**

A 39 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 7.9 grams. What was the percent iron in the sample of ore? Answer in units of %. Please help me understand how to ...

**engilsh**

what does central claim mean?

**MATH**

You have to get X all by itself and your answer will be evident

**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