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August 21, 2014

Posts by Hannah


Total # Posts: 2,827

Chemistry
If 7 mL of water is added to 3 mL of a 0.50 M KOH solution, the concentration of KOH is changed to? I am not sure how to go about doing this. Please help, thank you!!! Would I do (7)(3) / 0.50?
October 11, 2011

Chemistry
so would it be Mg3N2 + H2O -> 2MgOH + NH3
October 9, 2011

Chemistry
Write the balanced equation for: Magnesium nitride + water -> magnesium hydroxide + ammonia MgNO2 + H2O -> MgOH + NH3 Is this correct?
October 9, 2011

Chemistry
thank you!
October 9, 2011

Chemistry
Would this be correct for the complete equation? Ba^2+ + OH^- + H^+ + Br^- = Ba^2+ + Br^- + H2O
October 9, 2011

Chemistry
Write the net ionic equation for the reaction that occurs when aqueous solutions of barium hydroxide and hydrobromic acid are combined. I know that the first part of the formula would be BaOH + HBr but I do not know what the product would be since HBr is one thing. I do not ...
October 9, 2011

Language
What do these sets of words have in common?(Hint: Look for a sound, a keyboard, or the way they are written.) BCDEGPV QWERTYUIOP ij
October 6, 2011

Language
What do these sets of words have in common?(Hint: Look for a sound, a keyboard, or the way they are written.) BCDEGPV QWERTYUIOP ij
October 6, 2011

english
Where is pride and prejudice does mr. bennet confess that he married mrs. bennet because of her looks? a volume and chapter would be great:) I know the page numbers will be different in eat edition.
October 6, 2011

algebra
If you enter Interstate 40 at mile marker 23 in Sayre, Oklahoma, how far would you need to travel to reach mile marker 125 in El Reno, Oklahoma? After reaching El Reno, you might worry that your vehicle is running low on fuel. You know that your vehicle can travel 32 miles per...
October 5, 2011

Chemistry
is L the volume?
October 5, 2011

Chemistry
when doing a lab experiment on limiting reagents for CoCl2 there is a chart to fill out that says to find the concentration of test tubes 1-6, find the volume delivered and find the moles of CoCl2. How would I find the moles of CoCl2 for each test tube?
October 5, 2011

Chemistry(please check, thank you!!)
Thank you!
October 5, 2011

Chemistry(please check, thank you!!)
Is this equation balanced? CoCl2(aq) + Na2CO3(aq) -> CoCO3(s) + 2NaCl(aq) I think that it is because there is 1 Co on the left and 1 on the right. There is 2 cl on the left and 2 on the right. 2 Na on the left and 2 on the right and 3 CO on left and on right. Am I correct...
October 5, 2011

history
When were hunter gatherers around in america? why and when(a date or range would be great) did they settle down?
October 5, 2011

Chemistry, Need Help!!
a)How many grams of H2 are needed to produce 14.27 g of NH3? b)How many molecules (not moles) of NH3 are produced from 1.57×10−4 g of H2 ?
October 3, 2011

Chemistry
A)What mass of carbon dioxide is produced from the complete combustion of 7.00×10−3 g of methane? B)What mass of oxygen is needed for the complete combustion of 7.00×10−3 g of methane?
October 3, 2011

calculus
Let f(x)=6x+16x^2 . Then the equation of the tangent line to the graph of f(x) at the point (2,16) is given by y=mx+b for m= and b=
October 2, 2011

Chemistry
If the standard state of sufur is S8 (s), which of the following equations represents the standard enthalpy of formation of H2SO4 (ℓ) ?  A. 2H (g) + S (g) + 4 O (g)  H2SO4 (ℓ) B. H2 (g) + S8 (g) + 2 O2 (g)  H2SO4(ℓ) C. H2SO4 (ℓ) &#...
October 2, 2011

Chemistry
Calculate the enthalpy change, ΔrH, for the following reaction, 4 NH3 (g) + 5 O2(g) → 4 NO (g) + 6 H2O (g) given the thermochemical equations below. N2 (g) + O2 (g) → 2 NO (g) ΔrH° = +181 kJ N2 (g) + 3 H2 (g) → 2 NH3 (g) ΔrH° = ...
October 2, 2011

Chemistry
If H for the reaction I2 (s)  2I (g) is 153 kJ/mol. What is the longest wavelength of light that can break an I – I bond? In other words, what is the minimum energy, expressed in terms of wavelength, required to break one I – I bond? A. 246 nm B. 465...
October 2, 2011

Chemistry(Please check)
What is the oxidation number of chromium in K2Cr2O7 so k=+1 (2) = 2 O=-2(7) = -14 2x + 1 +(-14) = 0 2x-12=0 x=6 so Cr is 6 Is this correct?? Thank you!!
October 1, 2011

math
are we allowed to use calculators in sat 1 math?
September 30, 2011

math
A rectangle was constructed using 24 square tiles. If you add the length and width of her rectangle together, you would get 11. What is the length and width of this rectangle?
September 29, 2011

Chemistry
What is the oxidation number of chromium in K2Cr2O7? I know that K = 1 O=-2 so 7*-2=-14 I do not know what to do now. Thank you for your help!
September 27, 2011

7th grade math
it is a grid 0,5.10.15,20 thru 55 then it cost a camp;er 25.00 how does this work??
September 26, 2011

7th grade math
i need help with variables and patterns algebra
September 26, 2011

Chemistry(Please help, thank you!!)
Thank you. I understand how you got the numbers for Na and H and the -6 for O but why does S have to be +4?
September 26, 2011

Chemistry(Please help, thank you!!)
What is the oxidation number of sulfur (s) in NaHSO3? I know that Na is 1 but I do not know what else to do. Please explain, thank you for your help!!
September 26, 2011

Chemistry
When aqueous CuSO4 is added to aqueous Na2S2O3, why is there no reaction?
September 25, 2011

Physics
Can you explain how to figure this out? A helicoptor accelerates at a rate of 2m/s^2. If you drop a rock out of the helicoptor 3 seconds after takeoff how high is the helicoptor when the rock hits the ground. Thanks
September 25, 2011

physics
Two particles are at the same point at the same time, moving in the same direction. Par- ticle A has an initial velocity of 9 m/s and an acceleration of 2.7 m/s2. Particle B has an initial velocity of 2.9 m/s and an acceleration of 4.2 m/s2. At what time will B pass A? Answer ...
September 25, 2011

Chemistry(Please help, thank you!!!)
Write the balanced, complete, and net ionic equations for each precipitation reaction. 1) AgNO_3 + CoCl_2 ---> BE: AgNO_3(aq) + CoCl_2(aq) ---> AgCl_2 (aq) + Co(NO_3)(aq) CIE: Since the balanced equation is all (aq) there is no reaction so no complete or net equation. 2...
September 24, 2011

Chemistry(Please check!!)
Write the balanced, complete, and net ionic equations for each precipitation reaction. 1) AgNO_3 + CoCl_2 ---> BE: AgNO_3(aq) + CoCl_2(aq) ---> AgCl_2 (aq) + Co(NO_3)(aq) CIE: Since the balanced equation is all (aq) there is no reaction so no complete or net equation. 2...
September 24, 2011

physics
A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 75 kg, and the height of the water slide is 11.1 m. If the kinetic frictional force does -6.8 × 103 J of...
September 21, 2011

Physics
A 49.5-g golf ball is driven from the tee with an initial speed of 41.9 m/s and rises to a height of 29.7 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 5.66 m below its highest point?
September 21, 2011

Physics
A 27-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 150 J from 430 J. How high does she rise during this interval? Neglect air resistance.
September 21, 2011

Physics
Starting from rest, a 1.7x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.44 N on it. This force does 2.4x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground...
September 21, 2011

Physics
A person pushes a 23.4-kg shopping cart at a constant velocity for a distance of 31.1 m on a flat horizontal surface. She pushes in a direction 34.8 ° below the horizontal. A 38.5-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force ...
September 21, 2011

Math(Please help, very confused!)
A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? i have no idea how to start this. Please help thank you!!!
September 20, 2011

Calculus
2sin(2theta) + sqrt(3) = 0 interval (0,2pi) How do I solve this? I thought about maybe subtracting the sqrt(3) from both sides, so that i would have 2sin(2theta) = -sqrt(3) Then maybe dividing by two? sin(2theta) = -sqrt(3)/2 Am I doing anything right here? It's been a ...
September 20, 2011

chemistry
If you dissolve 29.25 g of sodium chloride in 250 g of H2O. What would be the freezing point? Kfp- -1.86 degrees C/molal I know the formula is K times molality. I am taking -1.86(2.00) and getting -3.72 degrees Celsius, when the answer is -7.44 degrees. What am I doing wrong?
September 19, 2011

Science
Unscramble acnsrl spgei
September 19, 2011

Math(Please help!!!)
A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? I know that first you have to get atoms to cancel out but them I do not know what to do!
September 18, 2011

physics
A 0.07 kg toy is made up of a spring of constant 375 N/m. When you place the toy on the floor,!@#$%^& the spring 7 cm and release it, the toy jumps upwards. What is in Joules the mechanical energy of the toy when sitting on the floor with a!@#$%^&ed spring? Use 10 m/s2 for g.
September 16, 2011

physics
A 0.05 kg toy is made up of a spring of constant 466 N/m. When you place the toy on the floor,!@#$%^& the spring 5 cm and release it, the toy jumps upwards. What is in Joules the spring potential energy stored in the toy when sitting on the floor with a!@#$%^&ed spring? Use 10...
September 16, 2011

physics
A 0.05 kg toy is made up of a spring of constant 466 N/m. When you place the toy on the floor,!@#$%^& the spring 5 cm and release it, the toy jumps upwards. What is in Joules the spring potential energy stored in the toy when sitting on the floor with a!@#$%^&ed spring? Use 10...
September 16, 2011

physics
It takes 9.10 J of work to stretch a spring 5.10 cm from its unstressed length. What is the spring constant k in N/m?
September 16, 2011

physics
It takes 5.50 J of work to stretch a spring 5.90 cm from its unstressed length. What is the spring constant k in N/m?
September 16, 2011

physics
Amy threw a ball of mass m=0.79 kg horizontally with an initial velocity v=33.4 m/s from a height h=1.9 m. What is the kinetic energy of the ball just before it touches the ground? Express your answer in Joules and use 10 m/s2 for g.
September 16, 2011

physics
A 0.730 kg particle has a speed of 3.00 m/s at point A and kinetic energy of 7.40 J at B. What is its speed at B? Answer in units of m/s.
September 16, 2011

physics
A 4.62 x 10-5 kg raindrop falls vertically at constant speed under the influence of gravity and air resistance. After the drop has fallen 83.7 m, what is the work done by gravity? Answer in units of milliJoule (a thousandth of a Joule) and use 9.8 m/s2 for g
September 16, 2011

Math(Please help)
A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? I know that first you have to get atoms to cancel out but them I do not know what to do.
September 13, 2011

Math(Please help! Thank you!!)
A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? I know that first you have to get atoms to cancel out but them I do not know what to do.
September 13, 2011

scientific method and measurement 8th Hons science
You see i already know its not replicable or such 13 letters long and it ends with an N.
September 12, 2011

scientific method and measurement 8th Hons science
Can Anyone Please Help Me?
September 12, 2011

scientific method and measurement 8th Hons science
what allows results to be verified to maintain credibility?
September 12, 2011

Math(Please help)
The radius of a niobium atom is 131 pm. How many niobium atoms would have to be laid side by side to span a distance of 1.4 mm?? I know that 10^9 is pm or is it -9??
September 11, 2011

Math
4.47 x 10^1 g How wouldI convert this to nanmograms? would I use 1mg / 10^-9 g? I do not understand how to do this
September 11, 2011

math
8 decimeters
September 11, 2011

Math(Please check! Thank you!!)
metric system conversions 1)3.68kg = ? g (3.68 kg) (10^-3 / 1kg) = 3.68 x 10^-2 g 2) 568cm = ? m (568cm) (1 m /100cm) = 5.68 m Are these correct?
September 11, 2011

PHYSICS
A student of weight 830 N was sent to another planet called Nerdland. If Nerdland has a mass that is three times the mass of the earth and a radius that is half the radius of the earth, what would be the mass in kg of the student when on Nerdland?
September 8, 2011

Calculus
find f(3) and f'(3), assuming that the tangent line to y=f(x) at a=3 has the equation y=5x+2.
September 7, 2011

Physics
At the heighest point on earth, the distance to the center of the earth is approximately equal to 1.0014 times the radius of the earth. What would be in N/kg the magnitude of the gravitational field (g) due to the earth at that position? Assume 9.8 N/kg for g at the surface of...
September 6, 2011

pre cal
A movie theater seats 400 people. For any particular show, the amount of money the theater makes is a function m(n) of the number of people, n, in attendance. If a ticket costs 2 dollars, find the domain and range of this function
September 4, 2011

Math
An auditorium has 1600 seats. At a ticket price of $6, the owners can sell 1200 tickets. For each 25 cent increase in price the tickets sold reduces by 25. What price should the owners set to maximize the income?
August 29, 2011

Math
What is another name for odd numbers?
August 29, 2011

Biology(Please help)
Why are cyanobacteria not bacteria? Is it because they can be nitrogen fixers?
August 28, 2011

Math
The expression 9a + 6s is theh cost for a adults and s students to see a musical performance.
August 26, 2011

physics
A body moving with uniform acceleration has a velocity of 9.9 cm/s when its x coordinate is 1.28 cm. If its x coordinate 1.3 s later is -9.1 cm, what is the magnitude of its acceleration? Answer in units of cm/s2.
August 25, 2011

physics
An electron has an initial speed of 178000 m/s. If it undergoes an acceleration of 4.8 x 1014 m/s2, how far has it traveled before reaching a speed of 789000 m/s? Answer in units of m.
August 24, 2011

physics
An electron has an initial speed of 178000 m/s. If it undergoes an acceleration of 4.8 x 1014 m/s2, how far has it traveled before reaching a speed of 789000 m/s? Answer in units of m.
August 24, 2011

Speech
I have to give a speech soon about my different " sides" of my life. Like my school life and what I do at school compared to how I act as a sibling etc. But I'm stumped on what my visual should be. My teacher wants originality no power point or posters with just ...
August 22, 2011

Pre-Algebra
5 and 17/20 - 3 and 1/4
August 18, 2011

Pre-Algebra
5 and 17/20 - 3 and 1/4
August 18, 2011

math
Suppose f is a 1-1 function with domain A and range B. What is the range of f^-1? Would it be A?
August 14, 2011

introductory technology
A boat is tied to a stake on a fast flowing river. What energy does the boat gain when the rope is cut.
August 10, 2011

reading
the setting where does the story take place, time period (present, future etc.), the main character(s), the plot-what happens to the main character
August 8, 2011

reading
I need help on writing a book report on anastasia absolutely
August 8, 2011

Statistics(Please help)
t-test for independent means: n=8 t=-1.33 df= 8 C.V. = plus or minus 2.306 My question is how do you get 2.306 for the cv??? Why wouldnt the cv be 2.31?
August 2, 2011

statistics
t-test for independent means: n=8 t=-1.33 df= 8 C.V. = plus or minus 2.306 My question is how do you get 2.306 for the cv???
August 2, 2011

Chemisty
How would you classify a solution of NaCl at 35.9 g/100 g of water at 20° C?
August 1, 2011

Chemisty
that's all the information i have, this is my only worksheet on the subject so i'm honestly only looking for an answer
August 1, 2011

Chemisty
How much KNO3 will you have to add to 100 g of water at 40° C to make a saturated solution?
August 1, 2011

Chemisty
In terms of saturation, how would you classify a KBr solution with a concentration of 78 g/100 g of water at 47°C?
August 1, 2011

Chemisty
In terms of saturation, how would you classify a KBr solution with a concentration of 78 g/100 g of water at 47°C?
August 1, 2011

Prob ans stat
Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson's psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean of 5.2 hours and ...
July 29, 2011

Statistics(Please check)
calculate the probability of the following: A four, three, or spade from a single draw from a 52 card deck. there are 4 4's so 4/52, 4 3's so 4/52 and then 13/52 spades so 21/52 but and one 4 and one 3 are from spades so minus 2 = 19/52 Is this correct?
July 23, 2011

Statistics(Ugent Please help!!)
Nevermind I figured it out
July 23, 2011

Statistics(Ugent Please help!!)
Assume that 100 subjects received one of four treatment combinations and produced the data reported below. Conduct a two-factor ANOVA and complete an ANOVA table reporting the relevant SS, df, MS, F's. N=100 n=25 the table shows A1 and A2 at the top and B1 and B2 on the ...
July 23, 2011

Statistics(Please help)
Assume that 100 subjects received one of four treatment combinations and produced the data reported below. Conduct a two-factor ANOVA and complete an ANOVA table reporting the relevant SS, df, MS, F's. N=100 n=25 the table shows A1 and A2 at the top and B1 and B2 on the ...
July 23, 2011

chemistry
A sample of metallic element X, weighing 4.315 g, combines with 0.4810 L of Cl2 gas (at normal pressure and 20.0¢ªC) to form the metal chloride with the formula XCl. If the density of Cl2 gas under these conditions is 2.948 g/L, what is the mass of the chlorine? The ...
July 22, 2011

chemistry
A sample of metallic element X, weighing 4.315 g, combines with 0.4810 L of Cl2 gas (at normal pressure and 20.0¢ªC) to form the metal chloride with the formula XCl. If the density of Cl2 gas under these conditions is 2.948 g/L, what is the mass of the chlorine? The ...
July 22, 2011

Statistics(Please help)
thank you
July 21, 2011

Statistics(Please help)
the problem asks to complete an ANOVA table and report the relevant SS, df, MS, and F values, and find the critical value for the F-values. I found my F values: they were 3 and 16. I do not understand how to find the critical value.
July 21, 2011

Math/Algebra
The length of Karen's living room is 2ft longer than the width. The perimeter is 80ft. Find the length and the width. Can someone please explain to me how you find the answers? Thanks a ton!
July 17, 2011

chemistry
After you preform your experiment, you determine that the Kf value for naphthalene is 6.9 . You are using 10g of naphthalene and added 1.0 g of your unknown. The the freezing point of the solvent decreased by 4.42 when the unknown was added. Knowing this information, determine...
July 17, 2011

chemistry
Strontium has density of 2.64 and crystallizes with the face-centered cubic unit cell. Find the radius of the strontium atom
July 10, 2011

chemistry
How much heat (in ) is evolved in converting 1.00 of steam at 150.0 to ice at -55.0? The heat capacity of steam is 2.01 and of ice is 2.09 .
July 10, 2011

chemistry
How much heat (in ) is evolved in converting 1.00 of steam at 150.0 to ice at -55.0? The heat capacity of steam is 2.01 and of ice is 2.09 .
July 10, 2011

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