ABCD
Popular questions and responses by ABCD
chemistry 101
Consider the following reaction. CaO (s) + CO2 (g) = CaCO3 (s) A chemist allows 14.4 g of CaO and 13.8 g of CO2 to react. When the reaction is finished, the chemist collects 19.4 g of CaCO3. Determine the limiting reactant, theoretical yield, and percent
asked on July 8, 2011 
chemistry 101
How many grams of oxygen are in 40.1 g of calcium hydroxide? options: 17.3 g 8.64 g 20.1 g 0.541 g 11.2 g
asked on July 8, 2011 
physics
Ant climb up 5 stairs, each of length 20 cm and height 20 cm . Find the distance covered and displacement covered by ant ?
asked on June 20, 2017 
Chemistry
If methane burns with oxygen and form carbon dioxide and water,so why the carbon dioxide doesn't extinguish heat produced .
asked on June 1, 2017 
chemistry 101
How many moles of oxygen are in 3.45 mol of diphosphorus pentoxide? options: 5.75 mol O 13.5 mol O 6.90 mol O 3.45 mol O 17.3 mol O
asked on July 8, 2011 
chemistry 101
given the reaction: 2mg + o2> 2mgo . when 4.32g of oxygen react with magnesium 327kj of energy is produced. the heat of reaction for 1 mole of oxygen is???
asked on July 9, 2011 
chemistry 101
How many molecules of oxygen are produced from the decomposition of 8.75 g of hydrogen peroxide in the following equation Mg + H2O2 > MgH2 + O2 options: 8.75 x 1024 6.02 x 1023 1.55 x 1022 5.27 x 1024 1.55 x 1023
asked on July 8, 2011 
chemistry 101
Lakes that have been acidified by acid rain can be neutralized by the addition of limestone (CaCO3). How much limestone in kilograms would be required to completely neutralize a 5.2 x 109 L lake containing 5.0 x 103 g of H2SO4 per liter?
asked on July 8, 2011 
chemistry 101
Determine the empirical and molecular formula for a compound made from 54.09% calcium, 2.72% hydrogen, and 43.18% oxygen with a total molar mass of 222.3 g.
asked on July 8, 2011 
physics
1) A particle moves in the xy plane (see the from the origin to a point having coordinates x = 7m and y = 5m under the influence of a force given by F= 3yi^2  5xj. a) What is the work done on the particle by the force F if it moves along path 1? (ABD) J
asked on May 31, 2018 
chemistry 101
Calculate the empirical formula for the following compound: potassium tartrate found in baking powder: 20.8% K, 2.7% H, 25.5% C, and 51.0% O
asked on July 8, 2011 
chemistry
Benzene, C6H6, is a known carcinogen that burns in air according to the following unbalanced equation: C6H6(l) + O2(g) CO2(g) + H2O(g) a. What is the mole ratio of O2 to C6H6? b. How many moles of O2 are required to react with each mole of C6H6? c. How
asked on July 3, 2011 
chemistry 101
Given the following dissolving process: Fe2(SO4)3 (s) = 2Fe3+ (aq) + 3SO42 (aq) How many grams of iron (III) ions are produced when 0.450 moles of sulfate ion are produced? options: 50.3 g 16.8 g 50.3 g 37.7 g 75.4 g
asked on July 8, 2011 
chemistry
Predict whether reactions should occur between aqueous solutions of the following compounds. If so, write balanced molecular and net ionic equations for the reactions. Include physical states. a. (NH4)2CO3 and CrCl3 b. Ba(OH)2 and HCl c. FeCl3 and NaOH d.
asked on July 3, 2011 
Physics
Describe another real world example for each type of collision. Real World Elastic Collision: Real World Inelastic Collision:
asked on February 28, 2018 
Thermodynamics
Consider air as an ideal gas with Cp=1000 J/(kg.K), R=287 J/(kg.K) and γ≈1.4. It is compressed from 1 bar, 300K to 10 bar using a compressor. The compressor can be considered adiabatic but not reversible. The flow rate is 2 kg/s, and the entropy
asked on November 22, 2016 
chemistry
Suggest chemical reactions that could be used to identify the contents of four unlabeled bottles containing solutions of the following substances: CuSO4, Al2(SO4)3, Pb(NO3)2, and FeSO4.
asked on July 3, 2011 
chemistry
Consider the following equations. For each, decide whether it represents a chemical reaction or a physical change. a. SnCl4(aq) + 4H2O(l) Sn(OH)4(s) + 4HCl(aq) b. 4K(s) + O2(g) 2K2O(s) c. NaCl(s) Na+(aq) + Cl(aq)
asked on July 3, 2011 
math
PQRS is a cyclic quadrilateral. Then find the value of x
asked on February 4, 2017 
physics
We know how to calculate the total resistance of the cylindrical conductor given its length, radius, and resistivity. But how do we calculate the equivalent resistance when the resistivity is not constant? For example, say the resistivity at a particular
asked on March 11, 2013 
chemistry 101
What is the coefficient for aluminum after the following equation is balanced: Al(s) + O2(g) > Al2O3(s) options: 2 4 1 3 0
asked on July 8, 2011 
Maths
Points A,B,C are given on circle Γ such that AB=BC. The tangents at A and at B intersect again at point D. The line CD intersects Γ again at E. The line AE intersects BD at F. If AD=120, what is the length of FB.
asked on May 29, 2013 
English  Shakespeare
In "Othello" Desdemona is slapped by Othello in Act 4 Scene 1. Why soesn't she defend herself eventhough she's innocent? I was thinking that maybe she was just too stunned to do anything or maybe she thought that something was wrong such as he was ill or
asked on January 7, 2009 
Thermodynamics
Consider air as an ideal gas with Cp=1000 J/(kg.K), R=287 J/(kg.K) and Î³â‰ˆ1.4. It is compressed from 1 bar, 300K to 10 bar using a compressor. The compressor can be considered adiabatic but not reversible. The flow rate is 2 kg/s, and the entropy
asked on November 22, 2016 
stats
Assume it is known that the probability of birth is equal in all months. What is the probability that in the STAT 1025 class of 120 students, exactly 20 students have their birthdays in either August or September? Solve using (i) the exact Binomial
asked on February 27, 2016 
math
What factoring technique would be used to factor 2x^2+5x+3?
asked on January 4, 2009 
math
How would the maximum and minimum values of a feasible region be found with a given function such as f(x,y)=x+3y?
asked on December 30, 2008 
Maths
Mariolys is creating a numbered list of distinct integers. Luigis sees that there are N numbers in the list, and states that he can find either a subsequence of length 13 with increasing terms or a subsequence of length 17 with decreasing terms. What is
asked on May 29, 2013 
Maths
Let S be a set of 31 equally spaced points on a circle centered at O, and consider a uniformly random pair of distinct points A and B (A,B∈S). The probability that the perpendicular bisectors of OA and OB intersect strictly inside the circle can be
asked on May 29, 2013 
math
Can anyone help, my calculator does not have enough space for simplifying this, sqrt[(16*10^113)/250*10^28]
asked on January 5, 2009 
math
Last question. If I have found all of the linear equations and have all of the intersection points for this feasible region, how do I calculate the maximum and minimum using the given function f(x,y)=x+3y?
asked on December 30, 2008 
math
Pertaining to the previous question, if two of the vertices of a feasible region are at (1,3) and (6,1) how would the linear equation representing a line connecting them be found?
asked on December 30, 2008 
Physics
In a relay race the second runner does not start from rest. it covers 100 m in 10 sec, finishing with maximum velocity of 12 m/sec, assuming the constant acceleration, determine his initial velocity. ??
asked on April 2, 2014 
Maths
Let A0=(−1,0), and let O be the origin (0,0). For each integer i≥1, we construct the point Ai so that Ai−1Ai=Ai−1O and the angle ∠OAi−1Ai is a right angle. If O,Ai−1,Ai+1 are not collinear for any value of i, what is the xcoordinate of
asked on May 29, 2013 
Math/Geometry
Two circles of radius r1 and r2 are extenally tangential to each other and are also externally tangential to a staight line l. Another circle of some unknown radius is externally tangential to both the circles and to the straight line l. Find the adius of
asked on March 13, 2013 
math
Are you sure that (2x+1)(x+3) is the factored version of 2x^2+5x+3?
asked on January 4, 2009 
Maths
Given the set of integers {1,2,3,…,801}, what is the maximum number of sets we could distribute these numbers into such that the sum of each set is exactly the same.
asked on May 29, 2013 
Maths
Find the denominator n of the rational number kn (k,n are both integers) such that ∣Root 2  k/n∣ is the smallest possible, out of all rational numbers with denominator less than 1000?
asked on May 29, 2013 
Maths
Let x,y,z be nonnegative real numbers satisfying the condition x+y+z=1. The maximum possible value of x^3y^3+y^3z^3+z^3x^3 has the form ab where a and b are positive, coprime integers. What is the value of a+b?
asked on May 29, 2013 
Maths (Geometry)
P is a point in rectangle ABCD. The distance from P to the 4 vertices of the rectangle are 7,15,24 and N in some order. If N is an integer, determine the value of N.
asked on May 29, 2013 
math
It's impossible to factor x^26x+5 right?
asked on January 4, 2009 
Drama
What are the techniques used in improv? I am assuming that you a refering to improvisational comedy rather than music or other areas. Since this is not my area of expertise, I searched Google under the key words "improv techniques" to get these possible
asked on October 10, 2006 
math
prove that tan(π/4+x/2)+tan(π/4x/2)=2sec x
asked on October 8, 2016 
Maths
Find the number of pairs of nonnegative integers (n,m), such that 1≤n
asked on May 29, 2013 
Thermodynamics
Consider 100 kg/s of steam expanding in a turbine. The inlet to the turbine is at 15 MPa, 500 degrees C. The steam expands to 0.01 MPa. The exit entropy is 6.200 kJ/(kg.K). Though the turbine is well insulated, at a place where the temperature is 127
asked on November 22, 2016

maths
Thanks
posted on September 27, 2019 
Physics
Thank you SO MUCH DAMON
posted on February 28, 2018 
Social Studies
D because it's convenient method
posted on June 1, 2017 
Math
Yes because when we smaller them like 25/45 divide by 5 and 15/27 divide by 3 it forms 5/9
posted on June 1, 2017 
Math
We have this at the U of A too
posted on February 23, 2017 
Physics
Two wires A and B of the same material and having same length, have their cross sectional areas in the ratio 1:6. What would be the ratio of heat produced in these wires when same voltage is applied across each?
posted on December 19, 2016 
Thermodynamics
Consider 2 kg of an ideal gas (R=300 J/(kg.K) and Cp=1000 J/(kgK)) contained in a piston cylinder arrangement. The cylinder has a small valve at the end opposite to the piston.The cylinder walls are not adiabatic and allow heat transfer. The initial
posted on November 22, 2016 
Thermodynamics
plzzz give the answer onlyyyy
posted on November 22, 2016 
Thermodynamics
1.What is the entropy production rate (in kW/K)? 2.If the process is possible, what is the outlet dryness fraction? 3.if the process is possible, what is the power output of the turbine, in MW?
posted on November 22, 2016 
alpha
We know sec²øtan²ø=1 Therefore (secø+tanø)(secøtanø)=1 From this we get secøtanø=1/x,secø+tanø=x Subtract both equation 2secø=x+1/x Secø=1/2(x+1/x)
posted on September 15, 2016 
Unknown
Exactly one triangle exists with the given conditions, and it must be a scalene triangle.
posted on April 16, 2016 
Cyber safety
A 1&3 B
posted on February 10, 2016 
math 3rd grade
Sarah ordered a veggie pizza she ate 3 slices of the veggie pizza how many factions of the veggie pizza are left over
posted on September 10, 2015 
Math
Cara order a veggie pizza she she ate 3 slices of the veggie pizza how many factions of the pizza are left
posted on September 10, 2015 
Physics
any one Q2_2_5
posted on July 28, 2013 
Physics
That's easy. From the given conditions, height= length/2
posted on March 19, 2013 
Geometry
Yes, solving gives HI^2= 792.
posted on March 7, 2013 
maths
This problem is at an website (brilliant . org). Please don't answer this since the problem is open. Answer this the next week.
posted on February 15, 2013 
chemistry 101
so whts th answer from th options??
posted on July 8, 2011 
English  Shakespeare
Thanks
posted on January 7, 2009 
math riddle
A robber ducky
posted on January 5, 2009 
math
Thanks
posted on January 5, 2009 
algebra
Just add the two together as they are then divde the term with no variable by the one with a variable to get your answer.
posted on January 5, 2009 
algebra
y=5/3X4
posted on January 5, 2009 
math
Ah, thank you. I was thinking that 5 had to be divided into squares but it is prime.
posted on January 4, 2009 
math
ok thanks
posted on January 4, 2009 
math
Sorry this was meant for Reiny
posted on January 4, 2009 
math
oh that's what you mean. I guess we call it something different. Thanks
posted on January 4, 2009 
math
nevermind
posted on January 4, 2009 
math
Not really
posted on January 4, 2009 
religion and social studies
I would have to say because religion has been an integral part of society since humans have lived. Social studies is studying society, people, customs, etc.
posted on December 31, 2008 
jewerly marking
I believe it is Continental silver. Yaahoo 82.5% silver and choose 3rd link
posted on December 31, 2008 
math
Thanks, I hope that's it.
posted on December 31, 2008 
algebra
Subtract 2cm from 16cm and then divide that number by 2. After that multiply it by 5.
posted on December 30, 2008 
Biology
1.Cytosol is the liquid found within a cell, so I would say D. BUT cytoplasm is actualy the cytosol + organelles. This would make D. and E. the same so I would say A. none of these. 2.Prokaryotic cells divide by binary fission. Although this is the way
posted on December 30, 2008 
math
Thanks, I appreciate the help.
posted on December 30, 2008 
math
Thanks
posted on December 30, 2008