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Questions Asked on March 23, 2010

Which of the following represents a pair of isotopes?Atomic Number Mass Number a. I 7 16 II 8 16 b. I 17 34 II 18 36 c. I 17 35
1. 3 answers
2. asked by Husy
3. 9,950 views
In a physics lab experiment, a spring clamped to the table shoots a 22 g ball horizontally. When the spring is compressed 22 cm,
1. 3 answers
2. asked by Naso
3. 6,502 views
A multiple choice test has 20 questions with each having 4 possible answers with one correct. Assume a student randomly guesses
1. 4 answers
2. asked by please help me!
3. 6,240 views
Which of the following formulas -- NO, N2O, NO2, N2O, N2O4, AND N205 -- represent the empirical and molecular formulas of the
1. 2 answers
2. asked by Jeaninne
3. 6,112 views
Amphetamine (C9H13N) is a weak base with a pKb of 4.2.Calculate the pH of a solution containing an amphetamine concentration of
1. 3 answers
2. asked by Kyle
3. 5,528 views
Which of the following species would NOT function as an oxidizing agent?a. MnO4- b. Mn+2 c. H+ d. S e. Br-
1. 2 answers
2. asked by Khin
3. 5,102 views
Identify the spectator ion(s) in the following reaction:Cu(OH)2(s) + 2H+(aq) + 2Cl–(aq) Cu2+(aq) + 2Cl–(aq) + 2H2O(l) a.
1. 3 answers
2. asked by Khin
3. 3,779 views
how many kilojoules of heat are absorbed when 1.00L of water is heated from 18 degrees celsius to 85 degrees celsius?
1. 1 answer
2. asked by brit
3. 3,207 views
An experiment consists of tossing a coin 14 times.(a) How many different outcomes are possible? (b) How many different outcomes
1. 1 answer
2. asked by Shane
3. 3,146 views
Which of the following is a weak electrolyte in aqueous solution?a. H2SO3 b. HNO3 c. HBr d. HClO4 e. NaOH
1. 3 answers
2. asked by zacky
3. 2,915 views
Calculate the wavelength (in nanometers) of a photon emitted by a hydrogen atom when its electron drops from the n = 4 state to
1. 2 answers
2. asked by Tanisha
3. 2,889 views
using rhetorical devices write a passage(300 words) on a person, idea or ideology.
1. 4 answers
2. asked by pat
3. 2,733 views
An electron is accelerated horizontally from rest in a television picture tube by a potential difference of 5400V . It then
1. 1 answer
2. asked by Jeremy
3. 2,554 views
An arch is in the form of a semi-ellipse, with its major axis as the span. If the span is 80 feet and the height is 30 feet
1. 1 answer
2. asked by dcw
3. 2,430 views
The vertex of a parabola is(-2,-4). One x-intercept is 7. What is the other x-intercept?
1. 1 answer
2. asked by becca
3. 2,268 views
What is the reduction half-reaction for the reaction between iron(II) sulfate and potassium permanganate in a sulfuric acid
1. 1 answer
2. asked by Husy
3. 2,189 views
What volume of 0.025 M sodium bromide, NaBr, contains 2.0 ´ 10-4 mole of Br-?a. 0.040 L b. 0.080 L c. 4.0 mL d. 8.0 mL e. 16 mL
1. 1 answer
2. asked by Zakaria
3. 1,987 views
For my research paper on Coral Reefs, can someone please help me write an intro paragraph? I think I should first start by
1. 3 answers
2. asked by y912f
3. 1,960 views
1. Which of the following infectious diseases accounts for 60 to 80 percent of all school absenteeism?A. Upper-respiratory
1. 5 answers
2. asked by DA
3. 1,913 views
What is the reduction half-reaction for the reaction between iron(II) sulfate and potassium permanganate in a sulfuric acid
1. 2 answers
2. asked by Zakaria
3. 1,893 views
0.500 mol of Ca(IO3)2 contains ------ mol of iodine, I; to supply this much iodine,----- g of calcium iodate are needed.
1. 1 answer
2. asked by Zakaria
3. 1,817 views
A(n) 13,300 lb railroad car traveling at 7.4 ft/s couples with a stationary car of 6790 lb. The acceleration of gravity is 32
1. 1 answer
2. asked by eric
3. 1,776 views
Two charged Ping-Pong balls separated by a distance of 1.20 m exert an electric force of 0.0300 N on each other. What will be
1. 1 answer
2. asked by Dar
3. 1,727 views
why do elements within a group have similar chemical properties?
1. 1 answer
2. asked by Ash
3. 1,628 views
What is the net ionic equation for the reaction of H2SO3 with Ba(OH)2?
1. 1 answer
2. asked by khin
3. 1,460 views
Respond to this question: "If a plant doesn't have enough water to openits guard cells, how would this affect its rate of
1. 1 answer
2. asked by mysterychicken
3. 1,423 views
A skateboard rider starts from rest and maintains a constant acceleration of +0.50 m/s squared for 8.4 s. What is the rider's
1. 3 answers
2. asked by Lamar McKnight
3. 1,421 views
Write a balanced chemical equation for each single replacement reaction.A) Au(s) + KNO3(aq) ==> ??? B) Al(s) + H2SO4(aq) ==> ???
1. 2 answers
2. asked by Danny
3. 1,383 views
Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its
1. 2 answers
2. asked by Mark
3. 1,365 views
write a passage (300 words)using rhetorical devices on a person,idea or ideology.
1. 6 answers
2. asked by pat
3. 1,329 views
Two charged dust particles exert a force of 3.8 10^-2 N on each other. What will be the force if they are moved so they are only
1. 3 answers
2. asked by Dar
3. 1,327 views
explain how mccarthyism affected the lives and political thinking of people in the u.s
1. 1 answer
2. asked by Anonymous
3. 1,296 views
A marble slides without friction in a vertical plane around the inside of a smooth, 21 cm-diameter horizontal pipe. The marble's
1. 2 answers
2. asked by Naso
3. 1,279 views
AAAAHHHH!!!"Antonyms" Antonyms are words that are opposite in meaning, like tall/short or laugh/cry. Listed below are pairs of
1. 21 answers
2. asked by Amy
3. 1,277 views
In a certain coastal basin, the sea water contains 3.5 grams of salt per 1000 milliliters of water. How many grams of salt would
1. 2 answers
2. asked by Lyndse
3. 1,269 views
3/8 of the 40 little engines could climb the hill. How many engines were in each part? How many parts could climb the hill? How
1. 9 answers
2. asked by Malory
3. 1,264 views
2. CheckPoint: Introduction and Conclusion· Resource: Drafting Your Research Paper · Consider the components of an effective
1. 3 answers
2. asked by Valentina Miozza
3. 1,222 views
Determine the [OH^-] of a solution that is 0.145 M in CO3^2-.
1. 1 answer
2. asked by Eddie
3. 1,220 views
1)) The following two half-cells are paired up in a voltaic cell. How will lowering the pH affect the E of the overall cell?C
1. 2 answers
2. asked by Val
3. 1,182 views
A solution is prepared by mixing 0.0200 mol CH2Cl2 and 0.0500 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the
1. 1 answer
2. asked by Sarah
3. 1,172 views
A mixture is prepared with [CO] = 0.035, [Cl2] = 0.015, and [COCl2] = 0.95. It is known that Kc for the equilibrium is 1.2 x
1. 3 answers
2. asked by CC
3. 1,141 views
given that a(-1,8) ,b(2,4) and if the line y=4 is the axis of symmetry of triangle abc find c.show that triangle abc is an
1. 1 answer
2. asked by anum
3. 1,140 views
Find the indicated binomial probabilities. Round to the nearest 3 decimal places.In a local college, 20% of the math majors are
1. 1 answer
2. asked by please help me!
3. 1,136 views
Why don't you move when you pull a door open and the force the door exerts on you is equal to the force you exert on the door?
1. 1 answer
2. asked by Taylor
3. 1,103 views
when dissolved in an aqeous solution, which of the following salts will yield an acidic solution? NH4Cl, NaClO4, Na2S, MgBr2,
1. 1 answer
2. asked by james
3. 1,102 views
Jen,amy,linda,max and jenny are compteting to fill two remaining spots on the chess team. How mant different combinations are
1. 1 answer
2. asked by Joe
3. 1,091 views
In simple terms describe and explain the differences between qualitative and quantitative evaluation methods
1. 0 answers
2. asked by Linda
3. 1,084 views
at 23C the reaction CaCrO4 -> Ca2+ + CrO42- has an equilibrium constant of 7.1 x 10-4. what are the equilibrium concentrations
1. 1 answer
2. asked by Ry
3. 1,055 views
Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its
1. 3 answers
2. asked by Mark
3. 1,053 views
Find the equation for each of the following items below:a. A line that passes through (6,26) and has a slope of 3. b. A line
1. 2 answers
2. asked by SEMA , Need Help
3. 1,044 views
I just need someone to explain this suggestion to me about a evaluation plan. I am so confused and my instructor not answering
1. 0 answers
2. asked by Tiara
3. 1,044 views
I have to make the graphs myself they cannot come from the internet. It has be all our own original work. So I am really stuck
1. 9 answers
2. asked by Tracie
3. 1,022 views
Compare and contrast the initial formation of two states—Virginia and Pennsylvania—by evaluating and listing the
1. 3 answers
2. asked by John
3. 1,017 views
What does the phrase "Youth will be served" in Jack London's short story "A Piece of Steak mean?
1. 0 answers
2. asked by Mary
3. 1,014 views
could someone please help....a cottage under construction is to be 35.6m wide. the two sides of the roof are to be supported by
1. 2 answers
2. asked by deborah
3. 1,001 views
Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its
1. 2 answers
2. asked by Mark
3. 996 views
Is there a good online source of information to compare and contrast the initial formation of two states—Virginia and
1. 1 answer
2. asked by John
3. 992 views
I have the polynomial x^2+2x-8 and when I tried to factor it, I just ended up confusing myself. Can anyone please help make
1. 1 answer
2. asked by Crystal
3. 990 views
slot machines are now video games, with outcomes determined by random number generations. in the old days, slot machines were
1. 1 answer
2. asked by steven
3. 989 views
At a particular temperature, Kc = 54 for the reactionIf 1.0 mole of H2 and 1.0 mole of I2 are placed in a 5.0 L container, what
1. 3 answers
2. asked by CC
3. 980 views
"Find the absolute minimum value of the function f(x) = x ln(x)".I know that one of the critical values is 1 (domain
1. 5 answers
2. asked by Stuck
3. 980 views
I just want to make sure if I'm correct; does this look correct to you?When all of the hydrogen of the Sun is used up, it will
1. 2 answers
2. asked by Sara
3. 976 views
Hutton Company uses a sales journal, a purchases journal, a cash receipts journal, a cash disbursement journal, and a general
1. 1 answer
2. asked by charmaine
3. 974 views
In order for a precipitation reaction to occur the product must be insoluble. However in an experiment we formed precipitates of
1. 1 answer
2. asked by kohel
3. 965 views
Find the values of Q in degrees and radians without the aid of a calculator.a) cotQ = sqrt 3 / 3 b) secQ = sqrt2
1. 1 answer
2. asked by Abbey
3. 963 views
What would be the final temperature of a mixture of 50 g of 20 0C water and 50 g of 40 0C water. I'm really not sure how to do
1. 0 answers
2. asked by Anonymous
3. 936 views
Identify the spectator ion(s) in the following reaction:Cu(OH)2(s) + 2H+(aq) + 2Cl–(aq) ---> Cu2+(aq) + 2Cl–(aq) + 2H2O(l)
1. 0 answers
2. asked by Zakaria
3. 923 views
2Li(s) + 2H+(aq) + SO42–(aq) ---> 2Li+(aq) + SO42–(aq) + H2(g)The reaction shown above between lithium and sulfuric acid is
1. 1 answer
2. asked by Zakaria
3. 918 views
how many grams of copper hydroxide can b prepared from 2.7g of copper (II) nitrate and excess sodium hydroxide?
1. 1 answer
2. asked by sophie
3. 915 views
What is the hydroxide ion concentration in mol/L of a solution if 0.080 grams of NaOH are dissolved in 2.0 liters of solution?
1. 1 answer
2. asked by Confused person
3. 908 views
evaluate the trigonometric functions by memory or by constructing appropriate triangles for the given special angles.a) csc 30
1. 1 answer
2. asked by Abbey
3. 905 views
H1+(aq) + Fe(s) ==> H2(g) + Fe2+(aq)I am trying to balance this equation...but I am not sure how to balance the H's. I have the
1. 1 answer
2. asked by Val
3. 899 views
what volume should a 1.0L balloon at 25 degrees celcius and 1.00 atmosphere pressure be if immersed in liquid nitrogen (-196
1. 1 answer
2. asked by finn
3. 896 views
Hello I have to write a paper and part of the paper is asking for information I am not sure which way to go if some one can
1. 3 answers
2. asked by Ann
3. 867 views
What is the difference between simple and complex carbohydrates?How are sugars are broken down and used in the body? What are
1. 2 answers
2. asked by me
3. 867 views
I'm trying to perform the indicated operations, and reduce to lowest terms, but I'm not sure if I got the correct answer. The
1. 1 answer
2. asked by Matt O.
3. 866 views
you have torn a tendon and are facing surgery to repair it. the surgeon explains the risk to you: infection occurs 3% of such
1. 1 answer
2. asked by steven
3. 857 views
In a bag of 10 marbles, there are 5 blue marbles, 3 red marbles, and 2 white marbles. Complete the probability distribution
1. 3 answers
2. asked by Marcie
3. 856 views
Use the given function values and trigonometric identities (including the relationship between a trigonometric function and its
1. 1 answer
2. asked by Mark
3. 833 views
Where would you most likely find a token economy as a form of classroom management?A} RRP B} Contract approach C} Contingency
1. 1 answer
2. asked by liana
3. 827 views
AN INCREASE IN THE PRICE OF PRUDUCT WILL REDUCE THE AMOUNT OF IT PURCHASHASED BECAUSE
1. 0 answers
2. asked by MEMEDOU
3. 826 views
1. A car starts from rest and accelerates at a constant rate to 80km/h in 6s in positive direction. What is the acceleration?2.
1. 1 answer
2. asked by Simeon
3. 816 views
Can you please tell me if the following statements regarding school rules are correct? Thanks a lot.1) You must: do your
1. 1 answer
2. asked by Franco
3. 809 views
the perimeter of a rhombus is 36 inches. if the longer diagonal is 14 inches what is the length of the shorter diagonal of the
1. 1 answer
2. asked by mc
3. 793 views
Which of the following techniques will help to meet the student’s need for autonomy?A. Give them clear directions B. Show them
1. 2 answers
2. asked by louise
3. 793 views
How can I explain the first five lines in the poem "Leaning Into The Afternoons" by Pablo Neruda?Leaning into the afternoons, I
1. 1 answer
2. asked by Troy
3. 791 views
What would be a good thesis statement for "Mid-Term Break" by Seamus Heaney I've read it about 100 times and I've analyzed it a
1. 1 answer
2. asked by Paul
3. 788 views
Rank the elements Ca, As, K, Br from highest to lowest first ionization energy. (Type your answer using the format W>X>Y>Z.)Woul
1. 1 answer
2. asked by Tiffany
3. 787 views
What was the planet last to be discovered out of these?1.Mars 2.Mercury 3.Neptune 4.Pluto 5.Saturn 6.Uranus 7.Venus
1. 1 answer
2. asked by sierra (6th grade)
3. 784 views
II.You are standing on the edge of a 50m high cliff and throw a ball vertically up with initial speed of 20m/s: 1.After how long
1. 1 answer
2. asked by Simeon
3. 774 views
Suppose the circumference of a circle is increasing at a rate of 3 cm/s. Find the rate at which the area of the circle is
1. 2 answers
2. asked by JaydenG
3. 757 views
for the school play, 1 adult ticket cost $5 and 1 student ticket cost $3. twice as amny student tickets as adult tickets were
1. 2 answers
2. asked by Anonymous
3. 751 views
In each of the following cases, either a recessionary gap or inflationary gap exists. Assume that the aggregated supply curve is
1. 0 answers
2. asked by Jacqui
3. 717 views
In a football game, a tackle running at a constant speed of 5 m/s tackles a stationary receiver. The two fly off horizontally at
1. 0 answers
2. asked by Patrick Siy
3. 716 views
I;m sorry, but I was stuck on the second part of this problem. Can you please help me?An automobile engine slows down from 4500
1. 3 answers
2. asked by Morgan
3. 709 views
Two charged spheres are 18.0 cm apart. They are moved, and the force on each of them is found to have been doubled. How far
1. 1 answer
2. asked by Dar
3. 708 views
Which of the following is a weak electrolyte in aqueous solution?a. acetic acid b. lithium acetate c. ammonium carbonate d.
1. 2 answers
2. asked by zacky
3. 703 views
use trigonometric identities to transform one side of the equation into the other.cos Q sec Q = 1
1. 1 answer
2. asked by Abbey
3. 695 views
Find the volume of a cube with a cylindrical hole of diameter of 68mm?It is a perfect cube with each side of 84mm Thank you.
1. 2 answers
2. asked by Lyndse
3. 678 views
What are some periodic trends among the following elements- carbon, silicon,germanium,tin, and lead?
1. 1 answer
2. asked by Ash
3. 678 views

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