# Posts by DAVID

Total # Posts: 2,277

**Chemistry**

What is the percent yield of a reaction that converts 5,0 kg of toluene to 6,02 kg of benzoic acid? 2C6H5CH3 + 3O2 --> 2C6H5CO2H + 2H2O

**Maths**

A tub is filled in 20mins but there is a leakage in it which can empty the full tub in 1hr in how many minutes can it be refilled

**Science**

Can you send me to a link that explains how genetic variation and environmental pressures can lead to a change in the characteristics of a population.

**MATHS**

There are 2000 students in a course. They wrote a mathematics test which was scored out of 40 and then converted to percentage. 1. Draw a flowchart that reads the name, sex and score of each student, and outputs the names of the female students that scored below 45% and how ...

**math**

Two circles touch each other. One of the circles has a diameter of 26 cm and the other circle has a diameter of 12 cm. Write down (a) the least distance between the centres of the two circles, ....................................................... cm (b) the greatest distance...

**Social studies**

Why do you think the Canadian government is opposed to Quebec's becoming a separate nation? I don't want someone to tell me can you provide me with a source so I can find the answer

**Social studies**

Thanks you for your time.

**Social studies**

My second answer is cod fishing.

**Social studies**

@Reed Also I meant in canada

**Social studies**

Which of the following is no longer allowed in the Atlantic Provinces? A)cod fishing B)fishing C)aquaculture**** D)fish processing Correct?

**Math**

Four pencils cost $0.60. How many pencils can you buy for $0.45?

**Math**

If my ladder is 6m long and its foot is 1.5m from a vertical wall how far can the ladder reach up the wall?

**History**

need help on history question The Gulf of Tonkin incident opened the door to A) Kennedy's assassination B) the Rolling Thunder strategy C) Lyndon Johnson realizing that the military D) could not win the war E) all of these answers are correct

**thermochemistry**

For part A i calculated Q to be 99.1608 kJ/mol. I don't understand where to go from there though to find part b.

**thermochemistry**

. Mountain climbers often brew tea by melting snow, which they heats over a stove. Our stove burns butane (C4H10), which has a heat of combustion of -2878 kJ/mol. The temperature of the snow is initially at -20 °C, and we need 80 °C water to brew tea. a. How much heat ...

**math**

the daily production of two factories A and B are 300 and 200 bottle respectively .2% of the product o f each factory are found to be defective .if 6 defective bottle are randomly selected from a daily production of A and B .find the probability that 4 of the defective bottles...

**chemistry**

Tfinal= m1c1T1 + m2c2T2/(m1c1+m2c2) I found this equation to solve for Tfinal, but not sure how it was derived or if its the correct method to solve this problem

**chemistry**

A 3.04 g piece of aluminum at 60.0 °C is placed into a “styrofoam cup” calorimeter filled with 150.0 mL of water at 25.0 °C. What is the final temperature of the contents of the calorimeter once thermal equilibrium has been established (everything has the ...

**English**

I was in a camp when i came back from the camp someone said "good exposure though what shoul i say ??

**English**

It about publicity

**English**

I was in a camp when i came back someone said these

**Algebra 1**

Consider the function L = 4h where L equals the number of legs on h horses. What would be the domain and range of the function?

**Math**

Talor is building a birdhouse for his backyard. He needs a piece fo wood that is 8 inches long and 6 inches wide. What is the area of the piece of wood tayler needs

**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 ...

**Biology**

What is one of the outputs or products of respiration? It has to be a four letter word with the second letter being e because it is the hint that my teacher gave us. I couldn't find anything on it. So far I have disocovered is carbon dioxide, water, and atp.

**Philosophy**

This is what i have done a. New Guinea is not advanced. This is Vagueness We do not know what New Guinea is not advanced in b. I called him a liar. It is true, and I am sorry for it. (Statement is that of a politician responding to the demand that he apologizes for calling a ...

**Philosophy**

1. For each of the following underlined statements identify any vagueness, semantic ambiguity or syntactic ambiguity in the statement. If the statement is vague, explain why. If the statement is ambiguous, provide at least two alternative interpretations of the statement that ...

**Social studies**

1. Why is mining important to the economy of the United States? Can you link a website where I can find this information more quicker?

**floral**

September

**Math**

theoretically if you roll a number cube 36 times, how many times would you expect to roll the number one? could you also give me explanation? Thank you. and also answer as fast as possible.

**Chemistry**

In the analysis of a sample of drinking water, a rate of 25.00 mL of the water requires 16.04 mL of AgNO3 to 0.05647 M in order to achieve an end to the Mohr method. What is the concentration of chloride ions in the sample?

**Algebra 1**

You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ...

**Algebra 1**

You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ...

**Algebra 1**

You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ...

**Science **

1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer. I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper. 2. A bucket of paint spills on ...

**Chemistry**

The volume of 10 ml of H2SO4 solution was diluted 250 ml with distilled water. This resulting solution, 25 ml were neutralized by 10 ml of 0.1 mol/L solution of NaOH. calculate the Molarity of sulfuric acid.

**Calculus**

The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the x-axis. Find the volume of the solid generated. I don't understand if we have to use the washer method or the disk method for this one because when I drew it out on a graph it looked very ...

**Physics **

Water of mass 200g and temperature 10digrees Celsius is put in a copper calorimeter of mass 80g. Steam from boiler at a normal pressure is passed into the calorimeter for sometime. The total mass of the calorimeter and contents is 283g. The final temperature of the contents is...

**Physics**

A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height. State the reason why the balloon stops rising.

**Math**

Students are being surveyed about the weight of books and supplies they are carrying as they attend class. a. Identify the variable of interest. b. Identify the type of variable. c. List a few values that might occur in a sample

**math**

76.9cm

**Math**

Find the equation of the line that has the same slope as the line through points (0,4) and (-5,7). But goes through point (-6,4) I don't get how to find the equation of the line

**american government**

what are the similarities between baltimore county council and the maryland

**english**

I think that the correct variant will be D a chronological order. One of the primary ways you might use it to write a historical narrative about the subject of term paper. For example, you might review the history of labour unions before you discuss the current situation.

**English writting**

I do not quite understand the topic. You may write about Barbie’s negative effects on young girls and there is much material about it. Even if your essay is ready, you may turn to the writers and let them proofread your work. Please, check out Marvelous essay service

**Science**

In what acceleration will tear a rope if it raises vertically body mass of 500 kg? The rope bears maximal strength force 15 kN.

**Science**

Determine the weight of an astronaut with a weight of 100 kg, if the rocket which rises him moves with acceleration 9,8 m/s^2

**mathsssss**

Suppose the roots of 2x^2 + 10x + 1 are a and B. Suppose another quadratic, x^2 + 1x + r, has roots y = a + 1/B and ? = B + 1/a. What are q and r?

**physics **

a truck of mass 5000kg is used to tow a jeep of mass 2500kg, the truck moves with a speed of 3.0ms(power -1) just before the towing rope becomes taut,calculate the speed of the truck just before the towing rope became taut,loss of kinetic energy of the system just after the ...

**physics **

a body British moving with a velocity of 20ms(power -1) collides with another body A, moving in the same direction on the same horizontal line with a velocity of 10ms (power -1).if the mass of the body A is three times the mass of body B, and the collision is perfectly elastic...

**physics **

a uniform meter bar of mass 120kg is sup ported on two knife edges 30cm from its center, with a diagram calculate the reactions at these supports when a 160kg mass is suspended 20cm from the center of gravity of the bar towards the left end

**physics**

A 200.0N steel box resting on a smooth surface is pushed to the right by a force of 50N, if the coefficients of starting and sliding friction are 0.74 and 0.53 respectively will the box move and if so what force isrequired to keep it moving at constant speed?

**physics**

A car traveling at 100 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.85 m . What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "g's," ...

**Research**

Research is a systematic inquiry that investigates hypotheses, suggests new interpretations of data or texts, and poses new questions for future research to explore. And statistics will be not enough to have a full research.

**Rates**

Not everyone helps everyone, which is a bit annoying...

**Algebra**

i'm not sure, but i know that b is definetly not the answer.

**Precalculus**

dats hard aff dude

**Language Arts**

Here are for your the similarities: Both follow much of the mythological journey covered by Joseph Campbell's breakdown Both have the mythical "supernatural aid" in the likes of Obi-Wan Kenobi and Gandalf, both of which wear robes and hoods. Both have the ...

**Physics**

How fast does a bowling ball drop 4 miles above ground.

**Maths**

Compute the following polynomial in standard form: (1 + x + x^2 + . . . + x^16)(1 - x)

**Science**

28cm3 of a gas weighs 0.4g at STP.Calculate the molecular mass of the gas.

**CHECK MY CHEMISTRY WORK PLEASE ASAP**

1. You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l. 2. You have a sample which consists of 428g sodium hydroxide (NaOH) ...

**CHEMISTRY**

You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l. 2. You have a sample which consists of 428g sodium hydroxide (NaOH) ...

**Chemistry **

1. You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l. 2. You have a sample which consists of 428g sodium hydroxide (NaOH) ...

**chemistry help asap please**

You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l.

**maths**

As the number of units manufactured increases from 4000 to 6000 the total cost of production increases form $22000 to $30000. Assuming a linear relationship between the cost and the number of units manufactured, what will be the cost when 4500 units are produced.

**math**

The pricing policy of a company follows the demand equation p=D(x). D(x) being the price per unit when x units are demanded. After studying the market trends the company determines the price function that is given by D(x)= 2000-4x. If the product is to be marketed the company...

**physics**

A certain vehicle can accelerate from rest to a speed of 25m/s in a time of 8s.What average power is needed to cause this acceleration?Neglect frictional losses

**Structural Steelwork**

A workshop table has an equilateral triangular top, each side of which is 900mm, the legs being at the three corners. A load of 500N is placed on the table at a point distant 325mm from one leg and 625mm from another. What is the load on each of the three legs?

**College Physic**

v=Aw A=v/w w=sqrt of k/m w=91.52 A=8.84/91.52 A=0.0966m

**College Physic**

A 1.54 x 10-2-kg block is resting on a horizontal friction-less surface and is attached to a horizontal spring whose spring constant is 129 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 8.84 m/s, while the spring is initially unstrained...

**chemistry**

how many moles are released when 13.2 g of ammonium sulfate 2NH4SO4 is dissolved in water ? I know 13.2 g 2NH4SO4 = .099 moles

**Physics**

How many kilograms of water can be evaporated at 100 degrees Celsius by the combustion of 470 litres of fuel oil whose heat of combustion is 37 MJ/Litre

**Algebra 2(help please!!)**

Divide 7 by 20 and it will give you your percentage.

**Math**

All of the following statement are true about factors EXCEPT: Complexity, Miniaturization, and productivity are examples of adjustment factors. A cost factor is a cost estimating relationship, where the dependent variable is not directly proportional to the independent ...

**Language arts**

What is The propositional phrase of this sentence.The ticket holders waited patiently (outside the movie theater).

**Algebra**

Find approximate solutions rounded to three decimal places for ?f(x)=x^2-5x+3

**Algebra**

Find the first 4 terms of the recursively defined sequence. a subscript 1 =9?, a subscript 2 =9?, a Subscript n+1=a Subscript n +a Subscript n-1 Are the first four terms A)9,9,18,18 B)9,9,9,27 C)9,9,81,729 D)9,9,18,27

**PHYSICS HELP**

Two identical gas cylinders each contain 20.0 kg of compresses air at 1.00 x 106 pa and 275 K. One of the cylinders if fitted with a safety valve that releases air into the atmosphere if and only if the pressure in the cylinders raises above 1.10 x106 pa (the other cylinder ...

**physics (urgent)**

Two identical gas cylinders each contain 20.0 kg of compresses air at 1.00 x 106 pa and 275 K. One of the cylinders if fitted with a safety valve that releases air into the atmosphere if and only if the pressure in the cylinders raises above 1.10 x106 pa (the other cylinder ...

**English**

Hey there! I think that you are right. The second sentence is missing the article 'the'

**math**

How many boys there are in the group that wears glasses over the total number of people that wear glasses. Remember to simplify.

**social studies**

What choice do you think the answer is?

**social studies - WW1**

The Central Powers were Germany and Austria-Hungary. Neutral nations that joined them were Bulgaria and the Ottoman Empire. The Allies were the United Kingdom, France, Serbia, and Russia. The neutral nations that joined them were Portugal, Italy, Belgium, Romania, and Greece. ...

**social studies**

That is correct.

**Math**

Well, consider the multiples: [6, 12, 18, 24, 30, 36, 42, 48, 54, 60, ...] Eventually, you run into repeating digits in the one's place. You should be able to figure it out from there.

**physic**

Electrical energy is really the effect of moving electrical charges from one point to another in a conductor. Electrical charges moving through a conductor is called electricity. Electrical energy may be easily changed into other forms of energy to suit our particular needs. ...

**Math Check**

1. You're correct, because the decimal repeats digits, it's considered rational. 2. I believe that's correct. It doesn't come out to 160ft^2, of course, but it's sure close at least. 3. This is false, actually. Rationals and Irrationals form their own ...

**computer programming**

You might be able to find some relevant information on somewhere like Stack Overflow.

**Algebra**

Make an equation out of the information given. You're going to have one of those values above set equal to an equation with a variable and you want to see how large you can make that variable without going above the constant you've set your equation to: y = ax + b That...

**Math: Creating a linear equation**

Is this question based off another that has already been posted? Regardless, with the information given, you cannot give the answer in a completely linear form because $141 is only a constant (as denoted by "as a one-time payment") Your equation would then be: cost...

**order pair and relations**

What are the multiples of thirty-six?

**Science**

"Hypo to Hyper, like a windshield wiper!" That's how I learned it. Everybody likes homeostasis, so when you have an imbalance like too much sugar outside a cell (or in this case, a grape), it will take responsibility and try to fix things by rebalancing the ...

**Math**

You have the [3 x $44.12] correct but for the [$0.44], it's not as simple as just adding the amount once. "Per mile" is your clue here.

**Math**

What equation did you come up with, or rather, how did you go about trying to solve it.

**Math**

Alright, it's the same idea, make an equation out of the information just like the first question I helped you with.

**Math**

"plus mile" is really ambiguous. Otherwise, all that you need to multiply the cost per day by the number of days the car was rented for.

**Math**

That is correct!

**Math**

Make an equation out of it: y = the total cost of the bill. y = (6 x $1.15) + $3.75 + $7.45 + (13 x $1.15) + (3 x $37.00) Do the math and you'll have your answer.

**social studies**

Ms. Sue is correct. It was nowhere near completion within Qin Shi Huang's lifetime. It was certainly a long-term project.