Ask a New Question

Questions and answers by

Gabriella

Questions (106)

How to improve Human Resources in Ghana
1. 0 answers
2. 145 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. 219 views
the discount price of a hat is $18 what is the regular price
1. 1 answer
2. 333 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. 391 views
Using the image above, what formula would you use to solve for the surface area?
1. 0 answers
2. 231 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. 454 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. 3,758 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. 2,802 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. 547 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. 880 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. 1,112 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. 463 views
A mile is 5280 feet. Between which two integers is the elevation in miles?
1. 4 answers
2. 1,713 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. 729 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. 780 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. 1,723 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. 3,130 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. 1,549 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. 748 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. 1,075 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. 865 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. 1,579 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. 2,304 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. 1,317 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. 764 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. 1,548 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. 545 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. 970 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. 1,169 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. 830 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. 1,660 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. 461 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. 621 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. 1,301 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. 676 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. 703 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. 994 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. 2,130 views
Cube root (x+8)-6=-2
1. 1 answer
2. 485 views
3(x-2)^4=24
1. 1 answer
2. 353 views
A 0.00100 M solution of a weak acid HX is 6% ionized. Calculate Ka for the acid.
1. 1 answer
2. 3,420 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. 2,747 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. 5,539 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. 3,594 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. 1,558 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. 688 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. 1,062 views
What is the value of Ksp for Ag2SO4if 5.70 g is soluble in 1.00 L of water?
1. 0 answers
2. 1,011 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. 624 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. 1,073 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. 1,111 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. 753 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. 1,073 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. 1,036 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. 896 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. 871 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. 1,227 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. 1,197 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. 1,922 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. 433 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. 2,874 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. 4,360 views
This temperature represents the freezingpoint of ethanol. (Which means delta G = 0) What is the entropy change for the
1. 1 answer
2. 607 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. 794 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. 4,910 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. 7,858 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. 2,037 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. 1,530 views
Convert 8.3×10^5 cal to kiloJoules
1. 1 answer
2. 419 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. 1,159 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. 1,990 views
assuming a density of 1.0 g/mL, calculate the molarity and mole fraction of 3.0% h2o2
1. 3 answers
2. 2,389 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. 596 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. 1,336 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. 3,923 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. 1,230 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. 1,955 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. 827 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. 3,194 views
redox reaction:Hydrogen peroxide is added to an acidified solution of potassium permanganate. what is the total redox reaction?
1. 1 answer
2. 1,131 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. 1,569 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. 4,293 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. 1,299 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. 2,325 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. 1,042 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. 1,852 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. 1,049 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. 929 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. 903 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. 663 views
Sulfuric acid (H2SO4)is prepared commercially from elemental sulfur using the contactprocess. In a typical sequence of
1. 2 answers
2. 1,292 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. 3,061 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. 2,017 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. 532 views
what is the product of 2x and (x2 + 7x -8.
1. 1 answer
2. 289 views
convert y=x^2+9x+14 to factored form
1. 1 answer
2. 1,016 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. 562 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. 699 views
Contrast the metric units of distance, time, and speed. Describe the relationship between them.
1. 0 answers
2. 421 views
:'( Please help me....?(7 points) 2. Contrast the metric units of distance, time, and speed. Describe the relationship between
1. 1 answer
2. 800 views

Pages

1
2

Ask a New Question

Archives
Contact Us
Newest
Privacy Policy
Terms of Use
© 2025