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Questions Asked on February 1, 2015

2C2H2(g) + 5O2(g)→4CO2(g) + 2H2O(g)a. Determine the enthalpy change for the reaction. ΔH = (4(-393.5)+ 2(-241.8)) – (2(227)
1. 4 answers
2. asked by Morgan
3. 22,443 views
The formation constant of [M(CN)4]^-2 is 7.70 × 10^16, where M is a generic metal. A 0.150-mole quantity of M(NO3)2 is added to
1. 1 answer
2. asked by shyamjp
3. 6,402 views
The measures of two complementary angles are in the ratio 1:4. What are the degree measures of the two angles?18° and 72°
1. 11 answers
2. asked by nyla
3. 5,591 views
A golfer, standing on a fairway, hits a shot to a green that is elevated 5.50 m above the point where she is standing. The ball
1. 2 answers
2. asked by Tanner
3. 4,865 views
You are given two unknown point charges, Q1 and Q2. At a point on the line joining them, one-third of the way from Q1 to Q2 the
1. 1 answer
2. asked by Anonymous
3. 4,143 views
You are constructing a mobile out of 5 identical toy helicopters, each of mass m = 25.3 g, 4 identical sticks (each length l =
1. 1 answer
2. asked by BK
3. 3,961 views
what are the coordinates of the shadow cast on the xy plane by a small object placed at the point (10,7,20) assuming that the
1. 4 answers
2. asked by annie
3. 3,551 views
how many moles are present in 2.45 x 10²³ molecules CH₄?
1. 2 answers
2. asked by may
3. 3,356 views
The figure shows a cube of air at pressure 1.0 atm above a hot surface on Earth. Contact with the hot surface causes the volume
1. 3 answers
2. asked by Morgan
3. 3,223 views
A(n) 0.42 kg softball is pitched at a speed of 12 m/s. The batter hits it back directly at the pitcher at a speed of 27 m/s. The
1. 2 answers
2. asked by Kev
3. 3,179 views
I am having some chemistry problems.3. The graph compares the 1s orbital energies for the F atom (Z = 9), the Ne+ ion (Z = 10),
1. 7 answers
2. asked by Morgan
3. 3,017 views
Which statement BEST describes the power of government provided by the Articles of Confederation?
1. 5 answers
2. asked by jam
3. 2,957 views
Answer the following questions about energy changes associated with heating and cooling a substance. Use the quantities in the
1. 8 answers
2. asked by Morgan
3. 2,935 views
Given:Equation #1: 4NH3(g) + 5O2(g) = 4NO(g) + 6H2O; ΔH of reaction = -1170 kJ Equation #2: 4NH3(g) + 3O2(g) = 2N2(g) + 6H2O;
1. 2 answers
2. asked by danny
3. 2,731 views
sucrose change of H is -2226.1kj/molfructose change of H is -1265.6KJ/mol calculate the enthalpy change for the hydrolysis
1. 2 answers
2. asked by mar
3. 2,725 views
Estimate the rate of the reaction,H2SeO3 + 6I- + 4H+ Se + 2I3- + 3H2O given that the rate law for the reaction at 0°C is rate =
1. 1 answer
2. asked by Is my answer right?
3. 2,544 views
Calculate the ΔH of reaction for:C2H4(g) + H2O(l) = C2H5OH(l) if the ΔH of formation for C2H4(g), H2O(l) and C2H5OH are +52,
1. 1 answer
2. asked by danny 16
3. 2,434 views
Particles of charge +65, +48, and −95 μC are placed in a line. The center one is L = 60cm from each of the others.Calculate
1. 2 answers
2. asked by Mary
3. 2,341 views
Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). If the ΔH for:CaC2(s) +
1. 1 answer
2. asked by danny
3. 2,271 views
On a frictionless air track, cart A hits cart B moving at a velocity of 2 miles per second to the right. Which answer predicts
1. 6 answers
2. asked by deja
3. 2,231 views
Tomochichi’s trip to England with James Oglethorpe was important becauseA) the English wanted to meet Oglethorpe’s Native
1. 5 answers
2. asked by jam
3. 2,064 views
a car has a mass of 820 kg. It starts from rest and travels 41 m in 3.0s. What is the net force applied to the car?
1. 1 answer
2. asked by none
3. 2,056 views
a farmer plants .6 0f a field with peanuts. the field is 5.6 acres in size. how many acres are planted with peanuts
1. 5 answers
2. asked by Jared
3. 1,984 views
a projectile with a horizontal component of 13m/s and a vertical component of 18 m/s would have an overall velocity of m/s??? at
1. 1 answer
2. asked by greoge
3. 1,935 views
witch result of the compromise of 1850 did not benefit the north?a-the fugitive slave law b-californias admittance tt he union
1. 3 answers
2. asked by Kaitlyn
3. 1,922 views
Which political development greatly increased tensions between the American colonies and Great Britain in the years just before
1. 16 answers
2. asked by jam
3. 1,895 views
Carlos has 32 iris bulbs and 40 tulip bulbs to plant. He wants to plant them in rows with one type of bulb in each row. He wants
1. 3 answers
2. asked by Calista
3. 1,836 views
James Wright was an effective and admired colonial Georgia governor. His popularity with the colonists allowed him toA)
1. 5 answers
2. asked by jam
3. 1,744 views
Can you check my answers to see if they are right and if not, help me on it?These questions begin with the paragraph starting
1. 1 answer
2. asked by Jessica
3. 1,706 views
what statements are true for the standard entropy change for the conversion of ozone to oxygen? Select all the apply?2 O_3 (g) >
1. 2 answers
2. asked by mar
3. 1,672 views
A model is made of a car. The car is 7 feet long, and the model is 16 inches long. What is the ratio of the length of the car to
1. 2 answers
2. asked by jade
3. 1,617 views
The difference of two numbers is 12. The sum of the larger number and 3 times the smaller number is 20. Find the larger number.
1. 3 answers
2. asked by Anonymous
3. 1,571 views
a particle is subjected to two displacement as follows: 30m to the northeast and 40m to northwest. what must be third
1. 2 answers
2. asked by raph
3. 1,481 views
A 6.5-kg bowling ball thrown with a speed of 5.4 m/s hits a stationary 1.75-kg pin. What is the velocity of each object? Assume
1. 1 answer
2. asked by Joanna
3. 1,461 views
Hello my name is am i am making a review on this site. Jiskha is a wonderful, excellent and spectacular site to go to for school
1. 12 answers
2. asked by jam
3. 1,401 views
Water is lifted from a well of depth 50m. If mass of water is 20kg and that of the rope is 0.2kg per metre the amount of work
1. 2 answers
2. asked by simar
3. 1,377 views
Which of these would have been a goal of the Ku Klux Klan in the south during Reconstruction?A) making sure Reconstruction went
1. 4 answers
2. asked by jam
3. 1,372 views
An airplane in Australia is flying at a constant altitude of 2 miles and a constant speed of 600 miles per hour on a straight
1. 1 answer
2. asked by Dee
3. 1,364 views
a copper cylinder has a radius of 2.5 cm and a length of 5.6 cm at 20 degree Celsius. The rod is heated until its temperature is
1. 3 answers
2. asked by Vans
3. 1,330 views
A friend plays an A note (440 Hz) on her piccolo while running towards you at 40 m/s. What frequency do you hear just before she
1. 1 answer
2. asked by Sarah
3. 1,223 views
Marko rides 10 km north of his homeon his mountain bike. He reaches an abandoned railroad, turns through an angle of 120° onto
1. 1 answer
2. asked by Juhi
3. 1,197 views
jellyfish sometime squeeze in the size of their bodies. this pushes a stream of water from the back end of their bodies.
1. 2 answers
2. asked by John boy
3. 1,172 views
Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he
1. 1 answer
2. asked by Tanner
3. 1,127 views
You are considering investingin a security that will pay you $1,000 in 30 years. If the appropriate discount rate is 10 percent,
1. 2 answers
2. asked by Rosemary
3. 1,085 views
An athlete performing a long jump leaves the ground at a 27.1∘ angle and lands 7.72m away1.What was the takeoff speed? 2.If
1. 1 answer
2. asked by Kelly
3. 1,063 views
I revised this memo to approve the you-attitude. Can someone tell me if I did it correctly? If I didn't what did I do wrong. I
1. 1 answer
2. asked by Miguel
3. 1,050 views
Why is graphite considered an element?
1. 2 answers
2. asked by tommy
3. 1,036 views
A sample of131 I was purified and then analyzed for iodine content. It was found that the sample was 99.8% pure. 25 hours later
1. 2 answers
2. asked by zac
3. 1,017 views
A place kicker must kick a football from a point 35.0 m (= 38.3 yd) from the goal, and the ball must clear the crossbar, which
1. 1 answer
2. asked by Madison
3. 1,003 views
A projectile is launched with an initial speed V0. At its highest point, the projectile's speed is V0/2 . What was the launch
1. 1 answer
2. asked by Tanner
3. 986 views
5. A boat capable of making 9.0 km/hr in still water is travelling upstream in a riverflowing at 4 km/h. An object lost
1. 1 answer
2. asked by ma
3. 966 views
5.6g of organic compound on burning with exess oxygen gave 17.6g of CO2 and 7.2g of H2O .the organic compound
1. 2 answers
2. asked by Anonymous
3. 963 views
Riding in an elevator, a man notices that he feel heavier or lighter based when the elevator speeds up or slows down. He stands
1. 3 answers
2. asked by Madison
3. 955 views
The primary route for making copper iodide is by reacting potassium iodide withcopper sulfate: 2CuSO4 + 4KI + 2Na2S2O3 ==> 2CuI
1. 1 answer
2. asked by Henry
3. 953 views
without air resistance maximum range of projectile is obtained with an angle of ????Can you please fill in the blank THANK YOU
1. 2 answers
2. asked by greoge
3. 945 views
Estimate the rate of the reaction,H2SeO3 + 6I^- + 4H^+ --> Se + 2I3^- + 3H2O given that the rate law for the reaction at 0°C is
1. 0 answers
2. asked by Anonymous
3. 942 views
Can someone check my answers to this? I'm really confused on these practice problems. Thanks!Directions: Using informal, formal,
1. 4 answers
2. asked by Sophia
3. 895 views
Write the equivalent fraction.6 2/5, 3 7/10
1. 1 answer
2. asked by Amari
3. 888 views
Determine the mass (in grams) of a 1% solution of Manganese(II) Sulfate that will contain 0.0403 grams.
1. 2 answers
2. asked by Bethany
3. 850 views
Co2(aq)->Co2(g)calculate the free-energy change for this reaction at 25 degrees Celsius.
1. 2 answers
2. asked by mar
3. 847 views
You are considering starting a walk-in clinic. Your financial projections for the first year of operations are as follows:Revenu
1. 0 answers
2. asked by Tyanna
3. 835 views
Solve each equation below by completing the square:1) x^2 + 6x = 16 My steps: x^2 + 6x - 16 = 0 (x - 2 )(x + 8) x = 2, -8 I set
1. 4 answers
2. asked by Ann
3. 826 views
Which type of mixture has the largest particles? Explain how you know.
1. 2 answers
2. asked by gothgirl
3. 826 views
Hello,I don't know where else to post the question but since this website has many teachers helping students and probably the
1. 6 answers
2. asked by John Doe
3. 818 views
The sum of the first 10 term of an arithmetic sequence is 145 and the sum of the fourth and ninth term is five times the third
1. 1 answer
2. asked by matso
3. 815 views
Calculate the molarity of a solution which contains 6.456g of Na2CO3 dissolved in 250.0 ml of solution.
1. 1 answer
2. asked by Steph
3. 810 views
The decay constant for a radioactive isotope is 7.82 x 10-6 /y. What is the half-life of this isotope in years?
1. 1 answer
2. asked by Brooklyn
3. 804 views
Welders often use acetylene torches heat up the metal. The reaction is:C2H2(g) + 2.5O2(g) = 2CO2(g) + H2O(g) Calculate the ΔH
1. 1 answer
2. asked by danny 16
3. 788 views
In an acid-base titration, 33.12ml of 0.1177 M H2C2O4 was titrated with 0.2146 M NaOH to the end point. What volume of the NaOH
1. 1 answer
2. asked by Steph
3. 786 views
Determine the mass (in grams) of Malonic Acid (C3H4O4) present in 10.0 mL of a 0.200 M solution.
1. 2 answers
2. asked by Amanda
3. 781 views
Why is soda in an unopened bottle a homogenous mixture?
1. 5 answers
2. asked by tommy
3. 772 views
What is the molarity of a solution of acetic acid if 35.00mL is titrated to the end point with 68.20ml of 0.750M KOH? What is
1. 1 answer
2. asked by Steph
3. 771 views
The larger of two numbers is ten more than twice the smaller number. The sum of the numbers is forty. Find each number.
1. 1 answer
2. asked by Alecia
3. 768 views
What governing body did the Georgia Charter of 1732 establish?
1. 9 answers
2. asked by jam
3. 752 views
In Gibbons v. Ogden, the Supreme Court held that? In Chapter 7 Federal Authority and the Limits to State Authority. If I am
1. 3 answers
2. asked by Martin
3. 749 views
A 25 kg cannon ball is fired from a cannonwith muzzle speed of 1520 m/s at an angle of 35.5 ◦ with the horizontal. The
1. 1 answer
2. asked by keegan
3. 737 views
A bird sits at rest in the middle of a wire. The wire slopes upward at 5* from the horizontal on either side of the bird. If the
1. 1 answer
2. asked by Madison
3. 736 views
Tom has a $20 bill, a $10 bill, a $5 bill, and $1 bill. List the total costs possible for items he could buy if he receives no
1. 2 answers
2. asked by George
3. 736 views
Solve the triangle α = 27 degrees 30', c = 52.8, a = 28.1
1. 1 answer
2. asked by anon
3. 732 views
Solvesquare root of 79-5x =6x+4 (Keep your answers in simplified improper fraction form)
1. 1 answer
2. asked by Izzy
3. 723 views
You are considering starting a walk-in clinic. Your financial projections for the first year of operations are as follows:Revenu
1. 0 answers
2. asked by Tyanna
3. 704 views
The following experimental data were obtained for the reaction;2 NO + 2 H2 ¡æ N2+ 2 H2O Rate/10-5M/s [NO]/10-2M [H2]/10-2M
1. 0 answers
2. asked by jhon
3. 696 views
Three pupils John, Daniel and David contributed a total of $400 for a party. John contributed $30 more than Daniel while, David
1. 1 answer
2. asked by kudu
3. 681 views
In Gibbons v. Ogden, the Supreme Court held that?
1. 3 answers
2. asked by Martin
3. 670 views
A(n) 0.42 kg softball is pitched at a speed of 12 m/s. The batter hits it back directly at the pitcher at a speed of 27 m/s. The
1. 1 answer
2. asked by Monica
3. 668 views
A professor gave an aptitude test to a class of psychology students and computed the mean, median, and mode for the test scores.
1. 1 answer
2. asked by Sally
3. 666 views
Suppose that your morning shower is 7 minutes long and uses 4 gallons of water per minute that is a nice 102 F in temperature.
1. 1 answer
2. asked by danny
3. 665 views
Choose the best example of a specific task assessment.A. Give a child two groups of marbles: a group of five and a group of
1. 2 answers
2. asked by Cristina
3. 665 views
I am a parent and need help with this problem so I can show my daughter how to complete.A recipe calls for 8 cups of flour. The
1. 1 answer
2. asked by Dana
3. 663 views
In Marbury v. Madison, the Supreme Court established the principle of constitutional review by? I am seconding guessing myself
1. 1 answer
2. asked by Martin
3. 648 views
You are considering starting a walk-in clinic. Your financial projections for the first year of operations are as follows:Revenu
1. 0 answers
2. asked by Tyanna
3. 643 views
A spring fixed to a wall is attached to a 6 kg block of wood on the other end. The block rests on a frictionless surface. The
1. 0 answers
2. asked by Sarah
3. 642 views
Need help with Achieving a Readable Style.Memorandum TO: Jerry Bradshaw DATE: March 29, 2011 FROM: Bill Jones SUBJECT: The Best
1. 1 answer
2. asked by Glenn
3. 641 views
Why did Augusta, Columbus, Macon, and Milledgeville become early centers of commerce in Georgia?
1. 4 answers
2. asked by jam
3. 639 views
Can someone please help me solve this problem?Calculate the solubility of Ba3(PO4)2 in water. For Ba3(PO4)2, Ksp = 1.3 x 10- 29
1. 1 answer
2. asked by Anonymous
3. 639 views
If you had a mixture of sodium chloride and sodium bromide, could you use its conductance to determine the concentration of each
1. 0 answers
2. asked by Mary
3. 636 views
A hammer falls from a scaffold on a building 50.0 m above the ground. Find its speed as it hits theground.
1. 1 answer
2. asked by Anonymous
3. 632 views
Vector A with arrow is directed along the positive y-axis and has magnitude 9.0 units. Vector B with arrow is directed along the
1. 1 answer
2. asked by LAIALI
3. 627 views
Proove that:a)2^(1/2) is not rational. b) prove that 2^(1/3) is not rational. I have managed to prove the first part, but i am
1. 1 answer
2. asked by arthur
3. 617 views
Imagine a grandfather clock. When the clock swings all the way to the right it 'ticks', when it swings all the way to the left
1. 0 answers
2. asked by Sarah
3. 614 views

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