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Gabriella

Questions (106)

How to improve Human Resources in Ghana
1. 0 answers
2. 130 views
A scale drawing of a kite is showing what is the area of the kite 28 CM 60 cm 96 CM or 192 cm
1. 1 answer
2. 212 views
the discount price of a hat is $18 what is the regular price
1. 1 answer
2. 322 views
You have now read two articles on heroes and one on superheroes. Write an essay explaining how the definition of a hero is
1. 1 answer
2. 371 views
Using the image above, what formula would you use to solve for the surface area?
1. 0 answers
2. 223 views
A man jogs at a speed of 1.8 m/s. His dogwaits 2.5 s and then takes off running at a speed of 2.7 m/s to catch the man. How far
1. 1 answer
2. 433 views
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
1. 20 answers
2. 3,738 views
Estimate the sum or diffrence. Use the bench marks 0, 1/2, 2 2/15 + 13/30 =Answers 0 1/2 1
1. 10 answers
2. 2,781 views
A shopper keeper sold a total of 15 boxes of pencils on Monday and Tuesday. She still three more boxes on Monday then on
1. 1 answer
2. 535 views
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
1. 1 answer
2. 856 views
The centripetal force of an object moving around a circle varies directly with the square of the speed and inversely as the
1. 1 answer
2. 1,091 views
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
1. 1 answer
2. 444 views
A mile is 5280 feet. Between which two integers is the elevation in miles?
1. 4 answers
2. 1,691 views
The average daily high temperatures in Lawton are approximately normally distributed with a mean of 58 degrees and a standard
1. 1 answer
2. 692 views
A car moves from rest with a constant acceleration of 4m/s squared for 5s .IT then continues with the speed attained for10s and
1. 1 answer
2. 766 views
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
1. 7 answers
2. 1,713 views
4.)Which word or phrase is closest in meaning to the word unanimous?a.)justifies b.)in agreement c.)divided d.)not accurate
1. 25 answers
2. 3,103 views
1.)Identify the underlined place in the decimal number 83.5 8 41.Round the number to that place.a.)thousandths;83.58
1. 14 answers
2. 1,516 views
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
1. 1 answer
2. 728 views
Use the Clausius-Clapeyron equation to calculate the temperature at which pure water would boil at a pressure of 367 torr. The
1. 1 answer
2. 1,041 views
Benzene is a hydrocarbon that is commonly used as a commercial solvent. However, it is carcinogenic; i.e., accumulations in the
1. 1 answer
2. 836 views
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
1. 1 answer
2. 1,558 views
A 1277 mL sample of nitrogen (N2) was collected by displacement of water at 24 degrees C under a total barometric pressure of
1. 3 answers
2. 2,269 views
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
1. 1 answer
2. 1,285 views
We drop 30 grams of magnesium into 770 mL of a 4 M HCl solution. What is the maximum volume of dry hydrogen that could be
1. 0 answers
2. 744 views
Iron pyrite (FeS2) is the form in which much of the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron
1. 2 answers
2. 1,519 views
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
1. 1 answer
2. 530 views
A 2.8 gram sample of a gaseous substanceoccupies 12 L at 47 degrees C and 683 torr. What is the density of the gas under these
1. 1 answer
2. 949 views
What pressure would a mixture of 3.2 grams of O2, 6.4 grams CH4, and 6.4 grams of SO2 exert if the gases were placed in a 4.1
1. 1 answer
2. 1,154 views
Nitroglycerin is a shock-sensitive liquid that detonates by the reaction4C3H5(NO3)3(ℓ)-> 6N2(g)+10H2O(g)+12CO2(g)+O2(g)
1. 1 answer
2. 815 views
To what temperature must a sample of helium gas be cooled from 110 degrees C to reduce its volume from 4.9 L to 0.7 L at
1. 1 answer
2. 1,640 views
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
1. 1 answer
2. 441 views
If 435 mL of 2.7 molar HCl solution is added to 128 mL of 3.2 molar Ba(OH)2solution, what will be the molarity of BaCl2 in the
1. 1 answer
2. 593 views
If 400 mL of 3.2 molar HCl solution is added to 300 mL of 2 molar NaOH solution, what will be the molarity of NaCl in the
1. 2 answers
2. 1,271 views
A 65 mL sample of a solution of sulfuric acid is neutralized by 46 mL of a 0.14 M sodium hydroxide solution. Calculate the
1. 1 answer
2. 644 views
How many moles of NaOH will it take to neutralize 0.77 L of 0.81 M HCl?Answer in units of mol
1. 1 answer
2. 684 views
50.0 mL of an HCl solution with a pH of 3.5 neutralizes 200.0 mL of a Ca(OH)2solution. What is the molarity of the Ca(OH)2
1. 1 answer
2. 972 views
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
1. 3 answers
2. 2,114 views
Cube root (x+8)-6=-2
1. 1 answer
2. 467 views
3(x-2)^4=24
1. 1 answer
2. 340 views
A 0.00100 M solution of a weak acid HX is 6% ionized. Calculate Ka for the acid.
1. 1 answer
2. 3,405 views
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
1. 6 answers
2. 2,725 views
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
1. 3 answers
2. 5,515 views
Consider the ionization constantscyanic acid (HOCN) : Ka= 3.5×10−4; ammonia (NH3): Kb= 1.8×10−5. A solution of ammonium
1. 3 answers
2. 3,572 views
Like all equilibrium constants, Kw varies somewhat with temperature. Given that Kw is 7.51×10−13 at some temperature, compute
1. 1 answer
2. 1,536 views
The pH of a solution of hydrochloric acid is 1.67. What is the molarity of the acid?Answer in units of mol/L
1. 1 answer
2. 669 views
The ionic substance T3U2 ionizes to formT2+ and U3− ions. The solubility of T3U2 is 4.07×10−20 mol/L. What is the value of
1. 0 answers
2. 1,039 views
What is the value of Ksp for Ag2SO4if 5.70 g is soluble in 1.00 L of water?
1. 0 answers
2. 985 views
Calculate the solubility product constant for calcium carbonate, given that it has a solubility of 5.3×10^7 g/L of water.
1. 0 answers
2. 599 views
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
1. 1 answer
2. 1,057 views
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
1. 1 answer
2. 1,091 views
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
1. 2 answers
2. 737 views
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
1. 1 answer
2. 1,056 views
The equilibrium constant for the reactionPCl3(g) + Cl2(g)<-> PCl5(g) is 35000 at 760◦C. At equilibrium, the partial pressure
1. 1 answer
2. 1,011 views
At 350 K, Kc= 0.142 for the reaction2BrCl(g)<-> Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal
1. 1 answer
2. 870 views
At a certain temperature, the equilibrium constant Kc is 0.154 for the reaction 2SO2(g) + O2(g)<-> 2SO3(g)What concentration of
1. 2 answers
2. 857 views
The equilibrium constant for thermal dissociation of F2F2(g)<->2F(g) is 0.300. If initially 1.00 mol F2 is placed in a 1.00 L
1. 1 answer
2. 1,206 views
Analysis of a reaction mixture showed that it had the composition 0.43 mol/L N2, 0.541 mol/L H2, and 0.124 mol/L NH3 at 800 K,
1. 4 answers
2. 1,179 views
The equilibrium constant Kp is 5.00×10^17 at 25◦C for the reaction C2H4(g) + H2(g)<->C2H6(g). From this information,
1. 1 answer
2. 1,912 views
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
1. 1 answer
2. 415 views
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
1. 2 answers
2. 2,853 views
Calculate the standard entropy change for the dimerization of NO2: 2NO2(g)→N2O4(g)at 298 K, ifS◦ ∆H◦f J/K·mol �NO2(g)
1. 2 answers
2. 4,314 views
This temperature represents the freezingpoint of ethanol. (Which means delta G = 0) What is the entropy change for the
1. 1 answer
2. 574 views
Calculate the entropy change when 4.44g of H2 reacts with O2 according to the reaction2H2(g) + O2(g)→2H2O(ℓ) at 298 K and 1
1. 1 answer
2. 770 views
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
1. 3 answers
2. 4,874 views
The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 6.4 grams of man- ganese
1. 1 answer
2. 7,828 views
The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 6.5 grams of manganese
1. 2 answers
2. 2,018 views
How much work is done by the system when2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 9.6 liters against a
1. 5 answers
2. 1,510 views
Convert 8.3×10^5 cal to kiloJoules
1. 1 answer
2. 399 views
A typical bathtub can hold 93 gallons ofwater. Calculate the mass of natural gas that would need to be burned to heat the water
1. 5 answers
2. 1,124 views
a student titrates three samples of 0.3% hydrogen peroxide solution made from a bottle of 3% hydrogen peroxide solution dated
1. 1 answer
2. 1,965 views
assuming a density of 1.0 g/mL, calculate the molarity and mole fraction of 3.0% h2o2
1. 3 answers
2. 2,366 views
A total charge of 96.5 kC is passed through an electrolytic cell. What mass of copper will be produced from a copper(II)
1. 0 answers
2. 565 views
A total charge of 96.5 kC is passed through an electrolytic cell. What mass of silver metal will be produced from a silver
1. 2 answers
2. 1,314 views
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
1. 2 answers
2. 3,898 views
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, writethe Nernst
1. 1 answer
2. 1,212 views
For the reduction of Cu2+by Zn, ∆G◦=−212 kJ/mol and E◦= +1.10 V. If thecoefficients in the chemical equation for this
1. 2 answers
2. 1,938 views
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
1. 1 answer
2. 808 views
Calculate the standard cell emf for galvanic cells with the cell reaction2H2(g) + O2(g)→2H2O(ℓ)in acidic solution. Answer in
1. 3 answers
2. 3,172 views
redox reaction:Hydrogen peroxide is added to an acidified solution of potassium permanganate. what is the total redox reaction?
1. 1 answer
2. 1,106 views
Write the half reactions and the balanced equation for the galvanic cellHg(ℓ)|Hg2+2(aq)||MnO4(aq),Mn2+(aq),H+(aq)|Pt(s). What
1. 2 answers
2. 1,544 views
Given the Na+/Na and K+/K half-cells, determine the overall electrochemical reaction that proceeds spontaneously and the E0
1. 6 answers
2. 4,276 views
What volume of water was added to the 350mL of NaOH solution? Assume volumes are additive. Answer in units of mL
1. 1 answer
2. 1,271 views
An unknown amount of water is mixed with350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is
1. 3 answers
2. 2,291 views
Listerine mouthwash is 21.6% ethyl alcohol by volume. What mass of ethanol is contained in 20.0 mL of mouthwash? (The density of
1. 1 answer
2. 1,014 views
We add excess Na2CrO4 solution to 68.0 mL of a solution of silver nitrate (AgNO3) to form insoluble solid Ag2CrO4. When it has
1. 2 answers
2. 1,823 views
How many milliliters of a 0.62 M HCl solution are needed to react completely with 4.7 g of zinc to form zinc(II) chloride?Answer
1. 1 answer
2. 1,032 views
A 40.3 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3.
1. 4 answers
2. 890 views
The reaction of 5.3 grams of fluorine withexcess chlorine produced 4.6 grams of ClF3. What percent yield of ClF3 was obtained?
1. 1 answer
2. 881 views
An ore contains Fe3O4 and no other iron. The iron in a 40.93 gram sample of the ore is all converted by a series of chemical
1. 2 answers
2. 633 views
Sulfuric acid (H2SO4)is prepared commercially from elemental sulfur using the contactprocess. In a typical sequence of
1. 2 answers
2. 1,263 views
A 28.4858 g sample of impure magnesium carbonate was heated to complete decomposition according to the equationMgCO3(s)→MgO(s)
1. 3 answers
2. 3,036 views
An ore contains Fe3O4 and no other iron. The iron in a 36.5-gram sample of the ore is all converted by a series of chemical
1. 6 answers
2. 1,999 views
A 12 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to
1. 2 answers
2. 502 views
what is the product of 2x and (x2 + 7x -8.
1. 1 answer
2. 282 views
convert y=x^2+9x+14 to factored form
1. 1 answer
2. 994 views
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
1. 1 answer
2. 544 views
Using a dictionary look up and then list four definitions of the word nice that you would use in a paragraph to develop this
1. 1 answer
2. 679 views
Contrast the metric units of distance, time, and speed. Describe the relationship between them.
1. 0 answers
2. 406 views
:'( Please help me....?(7 points) 2. Contrast the metric units of distance, time, and speed. Describe the relationship between
1. 1 answer
2. 761 views

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