Gabriella

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

Questions

The following questions were asked by visitors named Gabriella.

Why do countries want to be the most powerful? What is it they can control once they have reached that status? They can control the resources, money and people of the areas they have influence over, to the benefit of their industries and investors. Thanks...

an increase in aggregate demand when the economy is isolating in high levels of output will result in what? if anyone knows id be really greatful this question is gonna be on my exam...tomorrow!!! help me please if you can thanks

Waht kind of music do they listen to in Thailand? I'm doing a project about Thailand and as an idea, I thought of either playing traditional music or bringing in Thai food. I'm not sure where to find Thai music (or info about music in Thailand) though.

determine your distance traveled and displacement if you walk 100m foward than 35m

an 8-newton foce is applied to a 4-kg object. what is the rate of acceleration. a.4 meters per second b.8 meters per second c.2 meters per second d.12 meters per second

(16x - 4y) - 10x + 5y)

:'( Please help me....? (7 points) 2. Contrast the metric units of distance, time, and speed. Describe the relationship between them. Answer: (11 points) 3. A microbiologist measures the speed of a swimming bacterium. The bacterium covers a distance of 2....

Contrast the metric units of distance, time, and speed. Describe the relationship between them.

a) A linear function f(t)=b + mt has a slope of -4 and vertical intercept of 20. Find its equation. b) An exponential function g(t)=Ca^t has a decay factor of 1/4 and an initial value of 20. Find its equation. Plot both functions

convert y=x^2+9x+14 to factored form

what is the product of 2x and (x2 + 7x -8.

Sulfuric acid (H2SO4)is prepared commercially from elemental sulfur using the contactprocess. In a typical sequence of reactions,the sulfur is first burned:S + O2→SO2,then it is converted to SO3 using a catalyst:2SO2+O2→2SO3.The resulting SO3 is reacted w...

Given the Na+/Na and K+/K half-cells, determine the overall electrochemical reaction that proceeds spontaneously and the E0 value. Answer in units of V

Write the half reactions and the balanced equation for the galvanic cell Hg(ℓ)|Hg2+2(aq)||MnO4(aq),Mn2+(aq),H+(aq)|Pt(s). What is the smallest possible integer coefficient of H2O(ℓ) in the combined balanced equation?

redox reaction: Hydrogen peroxide is added to an acidified solution of potassium permanganate. what is the total redox reaction?

Calculate the standard cell emf for galvanic cells with the cell reaction 2H2(g) + O2(g)→2H2O(ℓ)in acidic solution. Answer in units of V

What is the standard reaction free energy if the standard cell emf is 1.23? Faraday’s constant is 96485 C/mol. Answer in units of kJ/mol

For the reduction of Cu2+by Zn, ∆G◦=−212 kJ/mol and E◦= +1.10 V. If the coefficients in the chemical equation for this reaction are multiplied by 2, ∆G◦=−424 kJ/mol. This means E◦= +2.20 V. True or false?

Pb(s)|PbSO4(s)|SO2−4(aq,0.60 M)||H+(aq,0.70 M)|H2(g,192.5 kPa)|Pt. If E◦for the cell is 0.36 V at 25◦C, write the Nernst equation for the cell at this temperature. out of the five following choices, which one is correct 1.E= 0.36 + 0.01285 ln 192.5(0.70)2...

Find the equilibrium constant for the reaction Cr(s) + Zn2+(aq)→Cr2+(aq) + Zn(s) if the standard cell emf is −0.76 V at the cathode and −0.91 V at the anode. RT - F= 0.025693 V

A total charge of 96.5 kC is passed through an electrolytic cell. What mass of silver metal will be produced from a silver nitrate solution? Answer in units of g

A total charge of 96.5 kC is passed through an electrolytic cell. What mass of copper will be produced from a copper(II) chloride solution? Answer in units of g

assuming a density of 1.0 g/mL, calculate the molarity and mole fraction of 3.0% h2o2

a student titrates three samples of 0.3% hydrogen peroxide solution made from a bottle of 3% hydrogen peroxide solution dated 10/31/2007. would you expect the calculated molarities of the samples to be higher or lower than the following values: trial 1: ....

A typical bathtub can hold 93 gallons of water. Calculate the mass of natural gas that would need to be burned to heat the water for a tub of this size from 60◦F to 99◦F. Assume that the natural gas is pure methane(CH4) and that the products of combustion...

Convert 8.3×10^5 cal to kiloJoules

Calculate ∆G0 for the following reaction. 4XY + 3Z2−→2Z3X2+ 2Y2 Substance ∆H0f S0kJ/mol J/mol·K XY 205.0 75.0 Y2 −82.0 37.0 Z2 −25.0 78.0 Z3X2 −245.0 137.0 Answer in units of kJ/mol

This temperature represents the freezing point of ethanol. (Which means delta G = 0) What is the entropy change for the vaporization of 3.3 mol H2O(ℓ) at 100◦C and 1 atm? ∆H= 40700 J/mol. Answer in units of J/K

Calculate the standard entropy change for the dimerization of NO2: 2NO2(g)→N2O4(g)at 298 K, if S◦ ∆H◦f J/K·mol NO2(g) 240.06 33.18 N2O4(g) 304.29 9.16 Answer in units of J/K·mol

A circular swimming pool has radius of 15 feet. The family that owns the pool wants to erect a circular fence that is 5 feet away from the pool. Which is the closest to the circumference of the fence they will need? A. 94.2 ft B. 125.6 ft C. 157 ft D. 188...

What is the activation energy Ea for this reaction? Answer in units of kJ The deltaH is 160 kJ X is at 160 (beginning of reaction) Y is at 300 (end of reaction)

The equilibrium constant Kp is 5.00×10^17 at 25◦C for the reaction C2H4(g) + H2(g)<->C2H6(g). From this information, calculate ∆G0 at 25◦C

The equilibrium constant for thermal dissociation of F2 F2(g)<->2F(g) is 0.300. If initially 1.00 mol F2 is placed in a 1.00 L container, which of the following is the correct number of moles of F2 that have dissociated at equilibrium? 1. 0.130 mol 2. 0.4...

At a certain temperature, the equilibrium constant Kc is 0.154 for the reaction 2SO2(g) + O2(g)<-> 2SO3(g) What concentration of SO3 would be in equilibrium with 0.250 moles of SO2 and 0.885 moles of O2 in a 1.00 liter container at this temperature? Note:...

The equilibrium constant for the reaction PCl3(g) + Cl2(g)<-> PCl5(g) is 35000 at 760◦C. At equilibrium, the partial pressure of PCl5 was 110 bar and that of PCl3 was 9.98 bar. Calculate the equilibrium partial pressure of Cl2. Answer in units of bar

A mixture consisting of 1 mol of H2O(g) and 1 mol CO(g) is placed in a 11 L reaction vessel at 800 K. At equilibrium, 0.422 mol CO2(g) is present as a result of the reaction CO(g) + H2O(g)<->CO2(g) + H2(g). What is Kc at 800 K?

The system CO2(g) + H2(g)<->H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. How many moles of CO2 must be added to the system to bring the equili...

Calculate the concentration of Hg2+ ions in a saturated solution of HgS(s). (Ksp=1.7×10^52) Answer in units of mol/L What volume of solution contains one Hg2+ ion? Answer in units of L/ion

A solution of AgI contains 1.2 mol/L Ag+. Ksp of AgI is 8.3×10^17. What is the maximum I− concentration that can exist in this solution? Answer in units of mol/L

Calculate the solubility product constant for calcium carbonate, given that it has a solubility of 5.3×10^7 g/L of water.

What is the value of Ksp for Ag2SO4 if 5.70 g is soluble in 1.00 L of water?

The ionic substance T3U2 ionizes to form T2+ and U3− ions. The solubility of T3U2 is 4.07×10−20 mol/L. What is the value of the solubility-product constant?

The pH of a solution of hydrochloric acid is 1.67. What is the molarity of the acid? Answer in units of mol/L

Consider the ionization constants cyanic acid (HOCN) : Ka= 3.5×10−4; ammonia (NH3): Kb= 1.8×10−5. A solution of ammonium cyanate (NH4OCN) is 1. acidic, because the cation and the anion hydrolyze to the same extent. 2. acidic, because the anion hydrolyzes...

What is the pH of a 0.41 M solution of pyridinium chloride (C5H5NH+Cl−)? (Kb for pyridine is 1.5×10−9.) Answer in units of pH

A given weak acid HZ has a Ka=1.7×10−6. What is the H3O+ concentration of a solution of HZ that has a concentration of 0.78 mol/L? What is the pH of this solution of HZ? What is the percent ionization of HZ in this solution? Answer in units of %

A 0.00100 M solution of a weak acid HX is 6% ionized. Calculate Ka for the acid.

Cube root (x+8)-6=-2

Which one of the following compounds is not a salt? 1. Ca(ClO4)2 2. Fe(NO3)3 3. Cr(OH)3 4. Na2SO3 5. KMnO4

50.0 mL of an HCl solution with a pH of 3.5 neutralizes 200.0 mL of a Ca(OH)2 solution. What is the molarity of the Ca(OH)2 solution?

How many moles of NaOH will it take to neutralize 0.77 L of 0.81 M HCl? Answer in units of mol

what is the pKa of an acid that has a pH of 7.4 at neutralization and has to have 25 mL added to neutralize it

Nitroglycerin is a shock-sensitive liquid that detonates by the reaction 4C3H5(NO3)3(ℓ)-> 6N2(g)+10H2O(g)+12CO2(g)+O2(g) Calculate the total volume of product gases at 201 kPa and 273 degrees C from the detonation of 3.3 lb (1496.9 g) of nitroglycerin. An...

A 2.8 gram sample of a gaseous substance occupies 12 L at 47 degrees C and 683 torr. What is the density of the gas under these conditions? Answer in units of g/L

We observe that 5 grams of a gaseous com- pound occupies 2083 mL at 50 degrees C and 574 torr. What is the molecular weight of the compound? Answer in units of g/mol

Part 1 of 3: An apparatus consists of a 2 L flask containing nitrogen gas at 30 degrees C and 758 kPa, joined by a valve to a 11 L flask containing argon gas at 30 degrees C and 49.7 kPa. The valve is opened and the gases mix. What is the partial pressure...

A 1277 mL sample of nitrogen (N2) was collected by displacement of water at 24 degrees C under a total barometric pressure of 966 torr. What mass of dry nitrogen was collected? The vapor pressure of water at 24 degrees C is 22 torr. Answer in units of g

The rate of effusion of unknown gas X is found to be about 1.5 times that of SF6 gas (MW=146 g/mol) at the same conditions of temperature and pressure. What is the molecular weight of gas X? Answer in units of g/mol

The cruising speed of an airplane is 150 mph. You plan to hire the plan for a 3 hour sightseeing trip. You instruct the pilot to fly as far north as she can and still return to the airport at the end of the allotted time. How far north should the pilot fl...

1.)Identify the underlined place in the decimal number 83.5 8 41.Round the number to that place. a.)thousandths;83.58 b.)hundredths;83.59 c.)hundredths;83.58 d.)thousandths;83.59 2.)Estimate $5.56 + $13.02 using front-end estimation. a.)about $19.60 b.)ab...

4.)Which word or phrase is closest in meaning to the word unanimous? a.)justifies b.)in agreement c.)divided d.)not accurate 5.)Which word is the best choice to complete the following sentence?She didn’t want to get in trouble for breaking the window, so...

Use the formula d = rt. Find t for r = 46.6 m/h and d = 456.68 m. Show your work. This question is not multiple choice

A car moves from rest with a constant acceleration of 4m/s squared for 5s .IT then continues with the speed attained for10s and then accelerates at 2m/s squared for 10s.A/ SKETCH A SPEED TIME GRAPH FOR THE WHOLE MOTION GIVING YOUR VALUES ON BOTH AXES.B/CA...

The average daily high temperatures in Lawton are approximately normally distributed with a mean of 58 degrees and a standard deviation of 12 degrees. Find the probabilities below: The probability that the high would not exceed 65 degrees on any one day....

A mile is 5280 feet. Between which two integers is the elevation in miles?

if a car is moving at some speed and then goes twice as far, would the braking distance be twice as far? yes or no? explain

The centripetal force of an object moving around a circle varies directly with the square of the speed and inversely as the radius of the object. Suppose the force is 300 N when the speed is 15 m/s and the radius is 5m. What would the force be if the spee...

A piece of machinery valued at $30,000 depreciates at a rate of 10% yearly. How long will it take for it to reach a value of $15,000?

Estimate the sum or diffrence. Use the bench marks 0, 1/2, 2 2/15 + 13/30 = Answers 0 1/2 1

You cut vegetables for a stew. You have 7/8 cup carrots, 1/3 cup onions, and 1/2 cup peppers. About how many cups of vegetable do you have in all? Answers About 1 cup About 2 cups About 3 cups About 1/2 cup

Answers

The following answers were posted by visitors named Gabriella.

yeah im sure i have it word for word

The satirical devices that is mostly used in the quote are Overstament and Parody. Satirical devices are normally portrayed ina sarastic manner.

they are both equal

74 seventy-four

2.505263158 m/s2

The mean seems to be a better estimate because the data points are closer to the mean and the standard deviation is less than the medians.

actually they aren't this is the question exactly as i got it off my worksheet.

okay graham could you possibly put that in a more understandable format because i'm not quite comprehending what you're saying.

Okay I get it now. Thank you.

Na half-cell potential is -2.71 K half-cell potential is -2.92 and yes that is all of the problem

where did you get the 6.6 from? and i did the work correctly and the answer was wrong.

i don't know equation to use.

Okay. I did each of these steps and I didn't get the correct answer.

What volume of natural gas does this correspond to at 25◦C and 0.8 atm? Answer in units of L I could not find the answer to the question above but this question uses the answer to the other question. So can you please help me.

For the first question, the answer I got was -20665.3 kJ and it was correct. However, every time I plug that answer into the equation I get the wrong answer for the second question. I've converted the aforementioned number into joules but I still got the...

I'm plugging that into my calculator and when I plug it into the answer box it keeps telling me that the answer is incorrect.

I got an answer of 0.226, now I need to know what the spontaneous direction of change is. It went from 0.278 to 0.226.

1. C 2. A 3. A these should be correct.

I got the first two parts correct but I can't seem to get the last part. The concentration I got for H3O^+ is 1.151520734e-3. When I plugged that in for the %ion I got 0.1476308633. I typed that into my homework and it said that is incorrect.

I tried .15 and it said it was incorrect.

1.)c 2.)b 3.)b 4.)c 5.)a 6.)a 7.)c 8.)d 10.) b 11.)d Tell me which ones are right and then help me with the wrong ones if any of them are wrong.

c b d c d tell me which ones are right then the ones are right then help me with the wrong ones

Thank you. Can you help me with the ones that are wrong. For number 1 83.58*41. The 8 next to the star is underline

And is the 11 b

What do you mean by insufficient information

5.)What is the best measure of central tendency for the data? Here is the full question to number 5 What answer do you get using this measure? Jessica Jennifer Janice Janine Jessica Jolene Jana a.)mode;Jessica b.)median;Jana c.)mean-Jessica d.)Mode-Janice

6.)Which of the following sentences contains a verb that is correctly formed in the perfect tense? a.)Susan is spoken at our club before. b.)Beverly has wanted to be a singer for years. c.)Desmond has love swimming in the ocean. d.)d.)Jake have painted hi...

That is the correct question for number 6.

what is the correct number to number 6 c or d

Can I get help with the others I got wrong please is 7 b

I think it is a am I correct

Can I also get help with number 5. I have no clue what it is

Suzanna lays the books end to end and finds that the board is the same length as 21 books.how many centimeters long is the board

car = subject for him = prep phrase is = linking verb one = subject compliment of those new GTO's = prep phrase

1. On Friday Esther showed the jeweler an antique necklace On Friday = Prep phrase Esther = Subject showed = verb Jeweler = Indirect Object necklace = Direct Object 2. Dianna gave George a cold shoulder at the party. Diana = Subject gave= verb George = In...

The parables in Luke Chapter 15, are compared to: C.the joy in heaven over one sinner that repents From his Gospel, how do you know Luke was interested in sickness and sick people? C.Luke noticed details regarding sickness. In Luke Chapter 10, how did Jes...

20 mL of a solution of HCl concentration, neutralized 0,50 g of Na2CO3. What is the Molarity of the acid solution?

I’m so confused on this For every cup of seltzer you use, how much orange juice do you use?

I’m so confused on this For every cup of seltzer you use, how much orange juice do you use? Thx, Matt-please help

I believe that it is D. because they would pray and sacrifice animals so they could get power, food, water, ect. Hope this helped!

It is Huns, I was looking through my work book and decided to help someone out! Hope you get a good grade.

Also the benchmarks actually dont connect to the problem, just wanted to clear that up.

Half a gallon of milk 1. Butter and mar.

Wow that's rude, and thank you for helping!

Was it right???

B I believe (The one that is marked)

Chronological order

Wait, so is it B or C???

Wait nevermind, B is more reasonable for it.

Draw a label line QR Draw point s on it