Nevaeh

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

Questions

The following questions were asked by visitors named Nevaeh.

1. What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it? 2. A 30.5 g sample of an alloy at 94.0°C is placed into 48.7 g water at 20.3°C in an insulated coffee cu...

Exercise 14.55 Consider the reaction: NiO(s)+CO(g)⇌Ni(s)+CO2(g) Kc=4000.0 at 1500 K When calculating the answer, do not round to the appropriate number of significant figures until the last calculation step..

Exercise 14.55 Consider the reaction: NiO(s)+CO(g)⇌Ni(s)+CO2(g) Kc=4000.0 at 1500 K When calculating the answer, do not round to the appropriate number of significant figures until the last calculation step. If a mixture of solid nickel(II) oxide and 0.10...

Predict the effect of decreasing the temperature on the position of the following equilibria. (a) H2(g) + Cl2(g) ↔ 2HCl(g) + 49.7 kJ My answer: shifts to the right (b) 2NH3(g) ↔ N2(g) + 3H2(g) ∆ H = 37.2 kJ My answer: shifts to the left (c) CO(g) + H2O(g)...

A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My a...

A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both sides). My a...

What is the final temperature and physical state if water when 47.50 kJ of energy is added to 15.0 g of ice at -10.0 C? Helpful information: Cs (ice) = 2.1 J/g C Heat of fusion (water) = 6.02 kJ/mol Cs (water) = 4.184 J/g C Heat of vaporization (water) =...

How many gallons of ethylene glycol, molar mass 62.07 g/mol, density = 1.1 g/mol do you need to add to each gallon of water ( 1 gallon = 4 liters and kf = 1.85 C/m) in your radiator to get the water to freeze at -15 C? Is it 0.458 gallon?

I got 62.9 mL. Is this correct? I think HCl is the LR. A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees...

Where did you get 5E-5. Is this how you set it up? 0.01 x 0.05 = 5E-4 If so, is it supposed to be 5E-4 instead of 5E-5? What is the equilibrium constant for a weak acid HA that dissociates 1% at an initial concentration of 0.05 M according to the followin...

Is the answer for part c 0.91? A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill...

I got an answer of -1.34 x 10^3 KJ/mol. A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture...

Which if the folowin species is not amphoteric? a) H2SO4 b) H2PO4- c) HPO4 2- d) HSO4- e) H2O

The pH scale ranges from 0 to 14. What is the range of the hydronium ion concentration covered by this scale?

Ammonium hydroxide is commonly advertised as an ingredient in some window cleaners. Rank the following in order of decreasing concentrations in these solutions: NH4OH, NH4+, OH-, NH3. Explain your reasoning. (Note that kb for ammonia = 1.8 x 10^-5. So doe...

Determine [OH-] of a solution that is 0.135 M in CO3^2-. I got 0.00532.

What is the pH of a solution that is 0.150 M in acetic solution and 0.300 M in sodium acetate? The Ka of acetic acid is 1.8 x 10^-5. My work: pH= pKa + log (base/acid) pH= -log (1.8 x 10^-5) + log (0.300/0.150) pH=5

The outside diameter of a pipe is 5 cm. The inside diameter is 4 cm. The pipe is 4 meters long. What is the volume of the material used for this length of pipe?Round your answer to the nearest cubic centimeter. (Hint: be sure that all units are in centime...

A student completes a titration of an unknown diprotic acid. In this experiment, 0.79 g of the acid is dissolved in 250.0 mL of water. It requires 13.48 mL of 1.0 M NaOH to reach the second equivalence point. What is the molar mass of the acid?

When titrating 50.0 mL of 0.10 M H2SO4 with 0.10 M NaOH, how many mL of NaOH will you have added to reach the 1st equivalence point? I am confused... What H2A problem? Chemistry-Dr.Bob222 - DrBob222, Tuesday, April 12, 2016 at 1:49am Refer to the H2A prob...

A 40.0 mL sample of 0.100 M HNO2 is titrated with 0.200 M KOH. Calculate the pH at the equivalence point for the titration of HNO2 and KOH. I got pH= 11.74.

A 40.0 mL sample of 0.100 M HNO2 is titrated with 0.200 M KOH. Calculate the pH at the equivalence point for the titration of HNO2 and KOH. When I did this problem again, I got pH= 8.08. Is this close to your answer? Dr.Bob: I estimated the pH and didn't...

A 100.0 mL sample of 0.05 M NH3 is titrated with 0.10 M HCl. Determine the pH of the solution after the addition of 50.0 mL HCl. Here is my work: NH3 + H3O+ --> NH4+ + H2O Before Addition: NH3= 0.005 mol H3O= 0 mol NH4+ = 0 mol Addition: NH3 = 0.005 mol H...

A 25.0 mL sample of 0.125 M pyridine is titrated with 0.100 M HCl. Calculate the pH at 0 mL of added acid.

Like a equilibrium constants, the values of Kw depends on temperature. At body temperature (37 C), Kw= 2.4 x 10^-14. What are the [H3O+] and pH of pure water at body temperature?

Determine [H30+], [OH-], and pH. A solution that is 0.655% HNO3 by mass (assume a density of 1.01 g/ mL for the solution).

Jay purchased a new leather jacket on sale at a 40% discount. The origanal list price was $320. What wad the amount of the discount. I just need to learn how to do this kind of question because my teacher did not teach me this.

Which is correct? The usefulness of learning is considered valuable. OR The learning usefulness is considered valuable.

Arrange the solutions in order of increasing acidity. NaCl, NH4Cl, NaHCO3, NH4CLO2, NaOH

A 500 mL buffer solution is 0.1 M benzoic acid and 0.10 M in sodium benzoate and has an initial pH of 4.19. What is the pH of the buffer upon addition of 0.010 mol of NaOH?

Is there an actual value for the buffer capacity of acetic acid? I need to know the actual value, so that I can calculate the percent error for my lab.

Consider the compounds with the generic formula listed and their corresponding molar solubilities in pure water. Which compound has the smallest value of Ksp? a. AC; molar solubility = 1.35 x 10^-4 M b. AX2; molar solubility = 2.25 x 10^-4 M c. A2X; molar...

Calculate the molar solubility of calcium hydroxide in a solution buffered at each pH. a. pH=4 b. pH= 7 c. pH=9

A 1.00 L buffer solution is 0.250 M in HC2H3O2 and 0.250 M in NaC2H3O2. Calculate the pH of the solution after the addition of 0.150 mol of solid NaOH. Assume no volume change upon the Additon o f NaOH. The Ka value for HC2H3O2 at 25 C is 1.8 x 10^-5.

I got pH = 5.3 A 1.00 L buffer solution is 0.250 M in HC2H3O2 and 0.250 M in NaC2H3O2. Calculate the pH of the solution after the addition of 0.150 mol of solid NaOH. Assume no volume change upon the Additon o f NaOH. The Ka value for HC2H3O2 at 25 C is 1...

Question 2 What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) + Cl-(aq) Is the answer 0.557 M?

I do not quiet understand what you said. Could you show your work. What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) +...

What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) + Cl-(aq) Work: Ksp = x^2 /(2x+10)^2 = 1.8 x 10^-10 Now I am confuse...

Determine the minimum concentration of the precipitating agent on the right to cause precipitation of the cation from the solutions to the left. a. 0.035 M BaNO3; NaF b. 0.085 M CaI2 ; K2SO4 c. 0.0018 M AgNO3 ; RbCl My work: Are my answers correct? a. BaN...

Predict the half-reactions occurring at the anode and the cathode for the electrolysis of aqueous Na2SO4.

A voltaic cell consists of a Zn/Zn2+ half-cell and a Ni/Ni2+ half-cell at 25 C. The initial concentrations of Ni2+ and Zn2+ are 1.50 M and 0.10 M, respectively. a. What is the initial cell potential? My answer: 0.56 B b. What is the cell potential when th...

Is the following correct? "The abysmal absence of food deprived me of energy."

Rank the following atoms in order of decreasing electronegativity, putting the most electronegative first: F, Ne, O, N, C

How many constitutional isomers have the molecular formula C3H6S ?

Which is the electrophilic site in the molecule (CH3)2C=O? A. CH3 carbon B. CH3 hydrogen C. C=O carbon D. C=O oxygen I think the answer is D. because oxygen is electronegative and wants to hog electrons this making it electrophilic. Is this correct?

Idk the answer to the question please help. Your a good man,Charlie Brown and "Happiness is a charming Charlie Brown at Orlando Rep" have very different purposes. In a paragraph, discuss how the purpose of each selection is reveled and why the purpose of...

The soccer team is selling key chains to raise money for the team. They ordered 100 key chains that sell for .25 each. There is a flat shipping rate of $8. The team sells the key chains for $2 each. With that information, I figured they made $33.00 sellin...

I am a seven letter word most people want me. If you have the second third and fourth letter you are sick. The 5th, 6th, and 7th letters are something with a charge. What am I?

How do i unscramble LCAIRTEPE

An ant is on top of a tree 232323 meters tall, directly above her home, which is 0.30.30, point, 3 meters below the ground. Which of the following expressions represents the distance between the ant and her home? A.) ∣0.3−23∣ B.) ∣23−(−0.3)∣ C.) None of t...

Can you assume that any fraction is in simplest form if either the numerator or denominator is a prime number?

what is 10.2 divided by 2 using compatible numbers

a box is placed on a ramp with an angle of incline of 25 degrees. what coefficient of static friction is required for the box to remain motionless?

a student applies a 100 n force at an angle 55 degrees above the horizontal to a 20 kg box. The coefficient of static friction is 0.43, and the coefficient of kinetic friction is 0.3. Describe the motion of the box.

A student applies a 60 n force at an angle of 60 degrees below the horizontal to a 45 kg box. If the coefficient of kinetic friction is 0.4, what is the acceleration of the box?

A student applies a 100 n force at an angle 55 degrees above the horizontal to a 20 kg box. The coefficient of static friction is 0.43 and the coefficient of kinetic friction is 0.3. Describe the motion. I really need help with this.

The table and the graph both show equivalent ratios. How are they similar? How are they different?

An early major objection to the idea that the earth rotates on its axis was that it would have to turn so fast that people would be thrown off into space. Show the error in this logic by calculating: the speed of a 100 kg person standing at the equator. (...

a 45 kg boy sits on a horse on a carousel 5.0 m from the center of the circle. he makes a revolution every 8.0 s. calculate his speed. what is centripetal force acting on the boy?

A 1.3-kg model airplane flies in a circular path on the end of a 23-m line. The plane makes 4.3 revolutions each minute. a. What is the period of the motion? b. What is the speed of the plane? c. What is the acceleration of the model plane? d. How much fo...

a student attaches a 0.5 kg object to a 0.7 m string and rotates the object around her head and parallel to the ground. how much tension force is required to make the object rotate with a speed of 12 m/s?

a student places a 10 g coin on a disk at a point 0.02 m from the center of the disk. the student rotates the disk with a steadily increasing speed. at what speed will the coin start to slide off the disk if the coefficient of static friction between the...

The function f has a domain of [0,5]and a range of [0,3]. Start by sketching a potential graph of f. Suppose the function k is defined as k(x)=f(x−3). Determine the domain and range of k. Domain: Range:

what is the average gravitational force of attraction between the earth and the sun? the earth averages a distance of about 150 million km. the earth has a mass of 5.97x10^24 kg, and the sun has a mass of about 2x10^30 kg.

the earth 's moon has a gravitational field strength of about 1.6 n/kg near its surface. the moon has a mass of 7.35x10^22 kg. what is the radius of the moon?

titan is the largest moon of Saturn. if a 60 kg person stood on titan, they would have a weight of 81 N. a. what is titan's mass if it has a radius of 2576 km? b. what is the gravitational field strength of titan near its surface?

Ok im just here to check my answer for this question a student places two 100 kg spheres a distance of 0.5 m apart. what is the gravitational force between the two spheres? Fg= GmM/r^2 F= 6.67x10^-11(100)(100)/(0.5)^2 F= 2.67x10^-6 N Correct me if I'm wr...

the earth has an average distance of 225 million km (2.25x10^8 km) from Mars. what is the gravitational attraction between Mars and a 60 kg person standing on the earth? mars has a mass of 6.39x10^23 kg. Correct me if I'm wrong Fg=GmM/r^2 F= 6.67x10^-11(...

what is the average gravitational force of attraction between the earth and the sun? the earth averages a distance of about 150 million km(aka 1.5x10^8 km). the earth has a mass of 5.97x10^24 kg, and the sun has a mass of about 2x10^30 kg. Correct me if...

which applies a larger force: the gravitational force on Mars by the sun or the gravitational force on the sun by Mars? explain your answer. Correct me if I'm wrong. Neither. They apply the same force on each other.

what is the gravitational field strength of mars measured at a position 400 km above its surface? mars has a mass of 6.39x10^23 kg and a radius of 3390 km. Correct me if I'm wrong. G=GM/r^2 G=(6.67×10^-11)(6.39×10^23)/(3390000+400000)^2 G=(6.67×10^-11)(6...

the period of the orbit of halley's comet is about 75 years. what is the comet's average distance from the sun? if it comes within 0.35 AU of the sun, what is its maximum distance from the sun in miles?

a student connects an object with mass m to a rope with a length r and then rotates the rope around her head parallel to the ground. the object takes 0.5 seconds to complete one rotation. mass= 50 kg. length of the rope = 1.2 m what is the objects speed o...

A student places an object with a mass of m on a disk at a position r from the center of the disk. The student starts rotating the disk. When the disk reaches a speed of 0.8 m/s, the object starts to slide off the disk. What is the coefficient of static f...

A particular satellite with a mass of m is put into orbit around Ganymede (the largest moon of Jupiter) at a distance 300 km from the surface. What is the gravitational force of attraction between the satellite and the moon? (Ganymede has a mass of 1.48x1...

find the minimum speed for the roller coaster riding along the inner side of a loop with a radius r and an acceleration of 1.5 times earth's little g for each of the following for each of the following rollercoaster constructions: a.the radius of curvatur...

I'm here to check my answers please correct me if I'm wrong. A student places an object with a mass of m on a disk at a position r from the center of the disk. The student starts rotating the disk. When the disk reaches a speed of 0.8 m/s, the object star...

Tony uses the length of his hand to measure the size of his desk. He finds the top of his desk to be about "3 hands by 9 hands" in size. Jacqueline uses her hand and finds the same desk to measure about "4.25 hands by 12.75 hands" in size. Tony's hand is...

Which of the following are appropriate units of angle measure? Select all that apply. 1/7-th of the circumference of a circle. 1 radian 1 inch 1/15-th of the circumference of a circle. 1 degree 1 meter

what is kinetic energy of a 1100 kg car traveling at a speed of 20 m/s? Just checking my answer. Ke= 1/2mv^2 Ke= 1/2(1100kg)(20 m/s)^2 Ke= 220000 J

what is the gravitational potential energy of a 30 kg box at rest on top of a hill that is 15 m tall? Peg= mgh Peg= (30 kg)(9.8 m/s^2)(15m) Peg= 4410 J Is this correct?

what is the spring potential energy of a spring that is stretched 15 cm if its spring constant is 350 n/m? how much force is required for this stretch?

how much work is required to make a 1400 kg car increase its speed from 10 m/s to 20 m/s? what average force is required if the car travels 15 m during this speed change?

Answers

The following answers were posted by visitors named Nevaeh.

(30.5)(X)(10.8)+(?)(10.8)=0 What number goes in the calorimeter constant ?

It's still not giving me the right answer. I'm pulling in the numbers, and doing the equation right. But, it keeps telling me, I am wrong.

an eight sided number cube has the numbers 1,2,3,4,5,6,7 and 8 on it. the number cube is thrown once. What is the probability of 2?

The answer is more than and 275 more because if u divide 13,750 by 50 you will get 275and if you divide 13,750 by 25 you will get 550 and is more than 275 Your welcome and sorry im so late but at least you know the answer now

I got 0.08, but the answer is wrong!

never mind.. I got 0.10..

Actually, when I did the problem again, I got 8.08. Is this correct?

9+4=13 13/2=6.5 So the answer is 6.5

10+5+10=25 25-5=20

This is NOT CORRECT

what are the writing questions

It is january 24 Ejjsmz Z Znxj

What is the purpose of adding graphics and multimedia to informational texts?(1 point) A. To clarify certain kinds of information for ease of understanding B. To reduce the amount of information for the reader C. To make a report look good D. To remove di...

I think a is right am I wrong

Mia Mee is 100% correct brother got 5/5

Please help i really don't understand this

Thanks but how do I do this ? b. the net force necessary to keep the person in this motion. c. how the normal force acting on the person compares to their weight. d. From your answers to these questions, explain why people do not fly off into space. What...

So would that make the tension required 9.47 N by any chance. That's what I got for the tension.

I really need help I'm not sure how to start this.

Same here I'm just really struggling

There are 19 individual socks how many pairs of socks are there will there be any socks without a match if so how many?

Ok so this is what I got for the first part U= 1/2k(delta x)^2 U= 1/2( 350 N/m)(15 cm)^2 U= 3.9375 j

So would the first one be Ke= 1/2mv2^2-1/2mv1^2 Ke= 1/2m(v2-v1)^2 Ke= 1/2(1400)(20-10)^2 Ke= 70000 J

W= (200 N)(5.0) W=1000 J Is this correct

Pe=(70)(9.8)(5.0) Pe=3430 J Is this right

So would it be 156250 m/s^2 And 1562500 N

So would it be 156250 m/s^2 and 1562.5 N

Would that be 127.6 m and 102.08 m

Would it be 16.5 m/s and 33 m/s since velocity would be doubled.

Would it be 1081.92 J

Wouldn't that be 967 m/s

So for 4 do we have to do any work like the first one

Please check this

$ 400 is that correct

Is that correct

Would it be A) they both have the same force B) they both have the same change in momentum C) the astronaut has a larger change in velocity.

Is this correct

*in velocity * sorry.

Is this correct if not correct me

I'm not sure about the angle

Your answers should be expressions in terms of x and y)

The second ones theta is tan(theta) =y/x But the first one is different

I really need to know

Is this correct A=wf^2-w0^2/2×delta(theta) A=15^2-0^2/2(60) A=15^2/2(60) A=1.875 rad/s^2 T=wf-w0/a T=15-0/1.875 T=8s

So for speed I got 454.22787863 mph And for miles in the last part is 68 miles.

I just need help finding the direction

How exactly would I use the tanθ = y/x formula

So would it be: T=2pisqrt(L/g) T=2pisqrt(1.5 m/9.8 N/kg) T=2.46 s Is this correct

in a dynamic , growing economy, changes in consumer demand and in technology continue to affect the market for particular types of labor. true or false. I'm not sure about this one.

What do the bigger g and f mean.

So it's e because a pendulum can increase frequency if it had a stronger gravity field or by shortening the rope of the pendulum itself.

I'm not sure how to do this

I choose c is that correct

Ok here I'd the next question to make the most out of their labor ,workers develop a. many different skills b. specialization c. profit d. strong work ethic I chose b

I got a is that correct

So what would it be

X=4 m What formula did you use

X=0.05 m 40+5=45 cm What formula did you use

Was I correct though

Ok for the radians it's 2.16465084 radians and degrees is 124.02535746 degrees.

Can you help me with this question. When going up stairs, by which method would you do more work? A. Running B. Walking C. Crawling D. All of the above options E. There is not enough information to compare these situations

When going up the stairs, by which method would you expend more power. A. Running B. Walking C. Crawling D. All of the above options produce the same power output. E. There is not enough information to compare these situations

So all of them have the same power output.

Would that be a.

So I guess walking and crawling are out of the question

A 1500 kg truck traveling at 80 km/h collides with another car of mass 1000 kg traveling at 30 km/h in the opposite direction. The two cars stick together after the collision. The speed immediately after the collision is

A 1500 kg truck traveling at 80 km/h collides with another car of mass 1000 kg traveling at 30 km/h in the opposite direction. The two cars stick together after the collision. The speed immediately after the collision is A. 36 km/h B. 60 km/h C. 180 km/h...

So how do I get this answer.

So it's 36 km/h

Ok but was a correct

Would it be the cylinder

So it wouldn't be a., b., c.,or e. Is it d

I'm still not sure

I answer would be either 8 or 10, because both of the sides have to be greater than the third side.

I want 8 yummy and one fourth as many cupcakes:2