Marcus

This page lists questions and answers that were posted by visitors named Marcus.

Questions

The following questions were asked by visitors named Marcus.

Solve. I have no digits the same. My thousands digit is less than my tens digit. My hundreds digit is twice my ones digit. If you add my digits, the sum would be 25. Who could I be? Could I be 2 numbers? We can not figure this out. Can someone help please...

place the operation signs (+,-,x, divide) in the order that makes each sentence true 18__6__2=15

What is the relationship between shapes and shapes?

The Linear equation y=6x-5 graphs as a horizontal/vertical/diagonal line ( choose the correct label and type it below)

The circumference of the base of a cylinder is 16 cm. The height of the cylinder is 10cm. a. What is the surface area of the cylinder? b. What is the volume of the cylinder? Need help on this one. I have the formula but I'm a little confused because I don...

How would day and night be different if Earth's axis were not tilted?

Why is Venus hotter than Mercury even though Mercury is closest to the Sun?

Please calculate the solubility of calcium sulfate in 0.010 mol/L calcium nitrate at SATP. This very question has been bugging me all weekend. Can some one please solve this quesiton it would really be appreciated.

Mr.Daly is running short on cash and needs to gas up his car. After filling his car up at the local gas station he takes off without paying. He is put on trial and somehow (miraculously for Mr. Daly) he is found innocent. The prosecution finds new evidenc...

In which situations is it appropriate to display data using circle graphs? When is it inappropriate to use the data displays in circle graphs?

I don't know what to do. Hosni fave the following argument that -(a+b)= -a+-b, for all intergers a and b. If the arqument is correct, suppy the missing reasons. If it is in correct explain why not. -(a+b)=(-1)(a+b) =(-1)a+(-1)b =-a+-b

I need to know how to do this. In steps 9x^2-3x 4x^2-9

List terms that complete a possible pattern in each of the following. 7,8,15,23,38 ____, ____, _____ I can not figure this out.

How would proportions be used to "scale up" or "scale down" something? (Not really sure if I even understand what this means. I even read my text and I can't figure this out.)

How do I know what the simple subject of the sentence is and the complete subject?

Use an appropriate local linear approximation to estimate the value of Cotangent 46 degrees.

Ethanol is a fuel that can be made from corn. How many kJ of heat energy are released when 3.00 kg of ethanol are burned? C2H5OH(l) + 3O2(g) ¨ 2CO2(g) + 3H2O(g) H = -1406.8 kJ/mol

Determine whether the graphs of the equations are parallel lines, perpendicular lines, or neither. 12x + 4y = 16 5y - 22 = -15x

Can you rank these from the smallest to the largest? Heart carbon atom sodium atom electron nucleotide tundra mitochondria glucose molecule fungal cell hydrogen atom

the amount of time spent in North American adults watching television per day is normal distributed with a mean of 6 hours and a standard deviation of 1.5 hours

You drive due east at 78 km/h for 55 min. Then you follow a road going 60 degrees south of east, going 99 km/h for another 38 min . Find your total displacement.

please help! You are given an unknown, colorless, solution that may contain only one salt from the following set: NaA, NaB, NaC. In solution each salt dissociates completely into the Na+ ion and the anion A-, B-, or C-, whose properties are A is green, B...

Ginny has a pumpkin with a mass of 4.8kilograms. If .9 of its mass is water, how much of its mass is water? How much is not water?

Given triangleABC is congruent to triangleXYZ, if AB=3X-1, BC=5X+2, XY=7, and YZ=14, find X.

An ideal monatomic gas initially at 298 K and 1 atm pressure is expanded from a volume of 1 liter to 2 liters. Consider separately isobaric, isothermal and adiabatic expansions to accomplish this. In each case, calculate the following: a) The final temper...

How many gallons of fossil fuel to make a gallon of each of the following? synfuel soy ethanol cellulosic electricity

If AB=5x+2 and AC=12x-2, what is BC?

You have 10 ml of a 1:10,000 solution of hydrogen peroxide (H2O2). What is the molar concentration of the solution?

DEFG is an isosceles trapezoid. Find the measure of <E.

Write a 1,400- to 1,750-word paper on essential communication in a community crisis situation described in the scenario. Include the following in your paper: • The individuals or groups that will be communicating inside and outside the organization during...

A basket containing 80 eggs weighs 2kg 300g. The same basket containing 60 eggs weighs 1kg 700g. Find the mass of the empty basket.

If a painter paints 8 different pictures to get a better perspective and then only selects 1 picture to illustrate her mood: what would this be called?

is 0.14 equal to 0.104

What is the acceleration of a 50kg person is pushed with a force of 4N

A weightlifter has a basal metabolic rate of 80.0 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450-Calorie bagel if he stays in bed all day? (b) How long does it take him if he’s w...

The teacher asked Laura to give each student 2/5 sheets of paper. If there are 20 students in the class how much paper did Laura pass out?

You have 2/3 bag of flour. Use 3/4 of the flour to make cookie dough. How much of the entire bag do you use to make cookie dough?

how do I write equation for the following? input a 20/28/36/44/52 output b 5/7/9/11/ ? ? is 13

The rate of a reaction A ---> B is expressed by the rate expression rate=k(A)2. If the molar concentration of A is tripled, the rate of the reaction should increase by a factor of some many?

What is the molality of an aqueous solution that is 10.0% ethanol, C2H5OH, by mass?

What mass of water must be used to dissolve 20.0 grams of ethanol, C2H5OH, to prepare a 0.0500 molal solution of ethanol?

A solution contains 10.0 g pentane, C5H12, 10.0 g hexane, C6H14 and 10.0 g benzene, C6H6. What is the mole fraction of hexane? I figured the equation would be: ___ M Hexane x 10 Divided by 30 =Mole fraction of Hexane?

When 1.150 grams of an unknown nonelectrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16°C. What is the molecular weight of the unknown compound? Kf for water = 1.86°C/m. -2.16 x m/-1.86 = 1.16 1.16/ .010 kg of water= 116 1.150/116= 9...

What is the vapor pressure of a aqueous solution containing 10 % (by weight) ethylene glycol (62 g/mol) at 25 °C. PH2O = 24.3 torr at 25°C?

2A + B2 + C --> A2B + BC Run # Initial Rate (M-1s-1) (A)o (B)o (C)o 1 1.6 x 106 1.2 M 1. x 10-2 M 1.0 M 2 1.6 x 106 2.4 M 1. x 10-2 M 1.0 M 3 3.2 x 106 1.2 M 2. x 10-2 M 1.0 M 4 6.4 x 106 1.2 M 1. x 10-2 M 2.0 M What would be the rate-law expression of th...

In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds?

The decomposition of N2O5(g) --> NO2(g) + NO3(g) proceeds as a first order reaction with a half-life of 30.0 seconds at a certain temperature. If the initial concentration [N2O5]0 = 0.400 M, what is the concentration after 120 seconds?

Cyclopropane rearranges to form propene: CH2CH2CH2 --> CH2=CHCH3 by first-order kinetics. The rate constant is k = 2.74 x 10-3 s-1. The initial concentration of cyclopropane is 0.290 M. What will be the concentration of cyclopropane after 100 seconds?

In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds? I found the concentration to be 1.25 x 10-2 M But then how do I fi...

Which of the following pure liquids is the best solvent for sodium fluoride? CCl4 C2C6 HCl BCl3 or PCl5 My guess would be either CCl4 or C2C6, I need to know the reasoning behind the correct answer.

Which of the following solutes in aqueous solution would be expected to exhibit the smallest freezing-point lowering (assuming ideal behavior? 0.1 m NaCl .2 m CH3COOH .05 m Al2(SO4)3 .1 m MgCl2 .25 m NH3 What would be the steps to picking the right option...

Which of the following solutes, dissolved in 1000g of water, would provide a solution would the lowest freezing point? .030 mol of BaCl2, CO(NH2)2, CaSO4, CH3COOH, or .030 mol of NH4NO3 Again, the steps needed to determine for the freezing point.

The decomposition of ozone may occur through the two-step mechanism shown below: step 1 O3 ----> O2 + O step 2 O3 + O ---> 2O2 The oxygen atom is considered to be: a catalyst or reaction intermediate? How am I supposed to be able to tell the difference be...

Another proposed mechanism problem: H2O2 + I ---> H2O +IO slow H2O2 + IO ---> H2O + O2 + I fast Which of the following statements in incorrect? a.) IO is a catalyst b.) I is a catalyst c.) The net reaction is 2H2O2 ---> 2H2O + O2 I would choose B, since I...

The molal boiling-point constant for water is 0.51 degrees C/molal. The boiling point of a 1.00 molal solution of Ca(NO3)2 should be increased by: A.) exactly 1.53 or B.) Somewhat less than 1.53 This is how I worked the problem: Ca(NO3)2 dislocates into 3...

A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

Stupid question time. I need to figure out how to rearrange equations to solve for x in my chemistry homework, which involves putting equations in quadratic form first. But I can't for the life of me remember how to "rearrange" them correctly. So what in...

Same kind of problem. How to rearrange to put an equation in quadratic form. Example I'm given is 49.7= 2x^2 / (1.00-x)(2.00-x) which should come out to .920x^2 -3.0x + 2.0 but I can't figure out exactly how to get to there, especially how to get the x sq...

I'm working on a problem dealing with calculating the heat of vaporization for vapor pressures problem. By substituting the problems values into the Clausuis-Clapeyron equation I get: .642= (2.28x10-5) x Delta H vap (J/mol) However, from this point I don'...

Domain of g(x) g(x)= sqrt(3-(sqrt(25-x^2)) I got -5, -4, 4, and 5. I wrote it like [-5, -4] U [4, 5] I don't think that's right?

Is 3.05313131313131313131313131... irrational or rational? Thanks.

solve (x-3)/(x+1) > 5 I get x < -2 every time, but it doesnt work when I plug it back in. (I plugged in -5)

lim as x approaches 3+ x^2+x-6/18-3x-x^2 I factored it into (x+3)(x-2)/(6+x)(3-x)

lim x->1 (1-(1/x^3))/ (1-(1/x^2)) I keep seeming to get a denominator of zero when I rationalized the denominator.

lim x->0+ for 1/1+ (5^(1/x)) I think there's no limit, since there is a vertical tangent at 0, is this correct?

A function is continuous at a point if its limit exists at that point. I think it's false because of the counterexample of one-sided limits?

A function can be continuous at every point of a deleted neighborhood of some point and still not have a limit at the point which is deleted. I'm not even too sure what this means in calculus terms. Can you please explain it better? Thank you.

When the concentration of a weak acid in solution is equal to the concentration of its conjugate base in solution, then: Would pH=pKa or would it equal pH=pKa + 1 like Henderson-Hasselbalch equation?

When looking at a titration curve, I have to determine which is not true and I have it narrowed down to two options: The initial starting point on the titration curve is where pH depends only on [HA]0 or The finial point on a titration curve the pH depend...

What is the [H+] of the 0.25 M HCl solution? I'm not given a Ka value, so I'm assuming I won't need one to solve this particular problem?

The indicator bromocresol green (HIn) can be in two different forms: As HIn the color of the indicator is yellow, an In the color of the indicator is blue, and an equilmolar mixture of the two species is green. The Ka of the indicator is 2.5 x 10-5. What...

First, the question I'm given is: What is the pH of a 1.0 L solution containing 0.25M acetic acid and 0.75M sodium acetate ( Ka for acetic acid= 1.8x 10-5) So I took the -log(1.8x10-5)= 4.74+log(.75/.25)= 5.22 pH But then I'm asked if .050 mol NaOH is add...

What is the pH of a 0.1 M NaOCl solution (Ka of HOCl is 2.95 x10-8) I did: x squared/.10= 2.95x10-8 x squared= 2.95x10-9 x= 5.43x10-5 -log(5.43x10-5)= 4.27 pH However, the options I'm given are either a.) 3.74 b.) 6.47 c.) 8.23 d.) 10.27 What steps am I d...

The question is: what is the ratio [NH3/[NH4+] in an ammonia/ammonium chloride buffer solution with pH= 10.00? (pKa for ammonia=9.25) When working the problem, I tried to solve it a bit backwards, in that I plugged in each of the multiple choices I was gi...

Which of the following result in buffered solutions when equal volumes of the two solutions are mixed? a.) .1 M HCl and .1 M NH4Cl b) .1 M HCl and .1 M NH3 c.) .2 HCl and .1 M NH3 d.) .1 M HCl and .2 M NH3 By def. I know that a buffed solution is made fro...

To illustrate the calculation, assume that 21.95 mL of a thiosulfate solution is required to reduce the iodine liberated by 20.85 mL of 0.0200M KIO3 and that 18.63 mL of the same thiosulfate solution reacts with the iodine replaced by 20.00 mL of an unkno...

Many portable gas heaters and grills use propane, C3H8(g). Using enthalpies of formation, calculate the quantity of heat produced when 15.0g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.

Factor: 49^2+112r+64 =

Which sentence uses proper grammar? I'm bored by math class. Or I'm bored of math class.

Meteorologists track a storm using radar. The radar shows a storm centered 30km west of town. Ninety minutes later, it's 30km north of town. Let the +x-axis point east and the +y-axis north. Assuming the storm moved with constant velocity, find that veloc...

A running track consists of two straight 88.5m segments and two semicircles of radius 39.0m The distance a runner travels in one complete lap I calculated to be 422 m. How do you find the displacement in x.y of a runner who covers half a lap?

You pull a sled across a horizontal frictionless patch of snow. If your pulling force is in the same direction as the sled's displacement and increases the kinetic energy of the sled by 34%, by what percentage would the sled's kinetic energy increase if t...

Doris invested some money at 7% and some money at 8%. She did at 7%. Her yearly total from the two investments was $7.80. How much did Doris invest at each rate?

Four cheeseburgers and five milkshakes cost a total of $25.50. Two milkshakes cost $1.75 more than one cheeseburger, and also find the cost of a milkshake. (A)$3.25 for a cheeseburger and $250 for a milkshake. (B)$3 for a cheeseburger and $2.90 for a milk...

I am sorry I didn't complete the problem Here is the question: Doris invested some money at 7% and some money at 8%. She invested $6,000 more at 8% than she did at 7%. Her yearly total from the two investments was $7.80. How much did Doris invest at each...

Simplify the exponential expression [-10x13y^12]^0 ---------------- 2x^9y^3

Sodium metal is immersed into graduated cylinder that holds exactly 32.5 ml. The sodium metal used to fill the cylinder weighs 405.5 grams. Calculate the density of sodium based on the given data.

50.0 mL of a solution of HCl is combined with 100.0 mL of 1.15 M NaOH in a calorimeter. The reaction mixture is initially at 22.4°C and the final temperature after reaction is 31.2°C. What is the molarity of the HCl solution? You may assume that there is...

What are the values (negative) being taught in this advertisement? The advertisement is trying to sell a military style watch. In the advertisement there are two armed soldiers in the background and appear to be situated in a war zone area. I am able to w...

Answers

The following answers were posted by visitors named Marcus.

Thank you DrBob222 I am having lots of problems with this homework

What is the relationship between shapes and other shapes

Thank you very much. This helps a lot. Marcus, age 10

Calculate the solubility of zinc hydroxide at 25 °C. The Ksp of Zn(OH)2(s) is 4.5 x 10^-17 at 25 °C? What did I do wrong? Zn(OH)2 <----> Zn2+ + 2 OH- let x = moles/L of Zn(OH)2 that dissolve. This gives us x moles/L of Zn2+ and 2x moles / L of OH- [Zn2+]...

2nd $1600 1st $800

2nd 16,000 1st 8,000

2nd 8000 1st 4000

71, 109, 180 is that right

2. the pressure rises until a liquid-gas equilibrium is reached. A real life example of this is fire extinguishers which store CO2 as a liquid at room temperature at really high pressures. Im just a student, but I think that as the dry ice sublimes into g...

1) 2 + (-3) = ? 2 - 3 = -1 2) (-7)(11) = ? - ( 7 * 11) - - (77) so (-7)(11) = -77

Owes is negative/ gives is positive -455 + 86 = - 369 -369 -107 = - 476 - 476 + 348 = -128 So, after all that, he owes the company $128

XY bisects and is perpendicular to line segments AB and CD . AB = 96 inches, and line segment AP = 52 inches. What is the length of XY ?

On the fastest speedways, some drivers reach average speeds of 2 miles per minute. write the formula that gives the number of miles M that such driver would travel in x minutes. How would this driver travel in 38 minutes?

Actually is does make sense. drwls misinterpreted the question. It's asking for a decrease of 400% over 10 year and NOT a percent decrease. This means, that for year 1, the cost of a cell phone drop by 40%. At year 2 it dropped by another 40%, and on and...

0,0 is the origin

0,0 is the origin there is no repelling charge

So what's the minimum speed ?

Thank you. I understand that it's because of the (3-x) on bottom that makes it negative?

Okay thank you.

I think there's no limit. Is that correct?

Two is greater than five? That's what I do not understand.. Thank you

Turns out all the values were right such as .02505 M and 35.45 g Cl etc, I just didn't need to multiply by 1000 and leave it in grams as you said.

Q1_2 _1 400 500 699.99 665.68

Q1_2_3 (25/12*W*H)/A_0*E_0

HW5_1_1 : 15.0 points -7 -17 HW5_1_2 : 15.0 points -3 8 HW5_2_1 : 20.0 points 1600 5600 11600 -11600 HW5_3 : 30.0 points 3.2 HW5_4_2 : 5.0 points 7 HW5_4_3 : 5.0 points -1

HW5_4_1_b : ´Q_2 :

HW5_4_1_b : ´-Q_2 :

HW7_1B_1 : Mmax+=4000

Thank you. I agree that the sentences are a bit childish. I didn't choose the wording of each sentence. They were the were questions submitted by others. I merely needed to choose the one that is grammatically correct. I just wanted a second opinion.

Sorry about the typos. It should've read: They were questions submitted by others. I have to be sure to triple check before posting.

How do I set this problem up?

In problem 1, where did you get 484? Also, how did you get the velocity?

I was only trying to help. : (

I know information about these but I don't know how to describe them.

Ok in this question or in a new one?

Ok, here my answer- Kristallnacht was a night where Nazis took cities and burn Jewish homes and churches down with killing any germans.

So was I right?

Im confused so true or false? I think is true

You can just divide 0.0972 g by 100 g and then multiply that number by 1 million because ppm= grams of solute/grams of solution x 1,000,000.

Please give me 3 reasons on how people reacted to the great depression

october 29,1929 to 1939

i think they were sorry they lost their money when the stock market crashed. But I don't know two other reactions...

I go to connexus

Perfect THANK YOU

I read it again I think it's B

The echoing green by William Blake

It's 11 questions on the test

The sun does arise, And make happy the skies. The merry bells ring To welcome the Spring. The sky-lark and thrush, The birds of the bush, Sing louder around, To the bells’ cheerful sound. While our sports shall be seen On the Ecchoing Green Till the littl...

In the one on the test it doesn't have the middle section.

Wow You got me a 67% Anonymous Right answer is D C Euclid known as the father of

Please someone answer

Frost is correct 100%

Kaelen, thank you so much for these answers

Crazy Dudeeee is right just took the test 100% thx

Thanks so much hello

Uh... 4.62 x 6.022 is 27.82164 how did you get 2.842?

I honestly don’t know I would do it then tell ya but I’m not trynna fail:/ someone do it plz