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October 25, 2014

Posts by TutorCat


Total # Posts: 689

Math
(# of dimes)/(total # of coins)
January 8, 2013

chemistry-opps again
^I meant molar mass of 4* carbons, because there are actually 4 carbons in Sn(CH3CO2)2 Sorry about that.
January 8, 2013

chemistry - opps
^I meant molar mass of 3* carbons, because there are actually 3 carbons in Sn(CH3CO2)2
January 8, 2013

chemistry
First, determine how much of the 325g is carbon. 324g [(molar mass of 2 carbon)/(molar mass of Sn(CH3CO2)2)] Then, convert grams of C to mole by dividing by C's molar mass. Finally, convert the mole to atoms. You know for every one mole there is 6.022 × 10^23 atoms.
January 8, 2013

algebra
http://www.purplemath.com/modules/systlin4.htm
January 8, 2013

Math
Standard from should be in this format: Ax +By= C http://www.algebra-class.com/writing-equations-2.html
January 8, 2013

algebra 2
For the first three, you would have to apply the rational zero theorem ((Broken Link Removed) and then use synthetic division ((Broken Link Removed) to see if the remainder is zero. For the last two, you would group the terms and factor out a common factor method(http://www....
December 31, 2012

Help Math
incorrect. Law of addition: P(A or B) = P(A)+ P(B)- P(A and B) source: http://www.quickmba.com/stats/probability/
December 30, 2012

chemistry
this link should help you answer your question: http://www.titrations.info/titration-errors
December 28, 2012

Urgent!
how to find mean, median, mode, and range: http://www.purplemath.com/modules/meanmode.htm
December 27, 2012

science
momentum = (mass)*(velocity)
December 20, 2012

science
If the amino acid is changed, the tertiary structure (interaction between R groups) will be changed. As a result, the protein's structure(/folding) and therefore function will be different.
December 18, 2012

Biology
http://utminers.utep.edu/rwebb/html/what_is_a_mutation_.html
December 18, 2012

Biology
either source: http://en.wikipedia.org/wiki/Mutation
December 18, 2012

Biology
http://staff.tuhsd.k12.az.us/gfoster/standard/bmut.htm
December 18, 2012

Chemistry
Every 14 seconds, the isotope's mass is halved.
December 12, 2012

chemistry
http://scienceworld.wolfram.com/biography/Dalton.html
November 19, 2012

Chemistry
PV=nRT where P= pressure in atm V= volume in L n =(mass of Ar)/(molar mass of Ar) R=0.082058 L atm mol-1 K-1 T= temperature in Kelvins
November 9, 2012

Chem
what are the units? http://www.jiskha.com/display.cgi?id=1352484673
November 9, 2012

Chem
Convert the path length to cm. Plug in Beer's law equation and solve for c. A = ε l c http://www.chm.davidson.edu/vce/spectrophotometry/beerslaw.html
November 9, 2012

Chemistry
volume = (length)*(width)*(height) density= mass/ volume
September 29, 2012

chemistry
opps yes your formula is correct!
September 9, 2012

chemistry
The correct formula: q = mcΔT or c = q/[(m)(ΔT)] http://chemistry.about.com/od/workedchemistryproblems/a/Specific-Heat-Example-Problem.htm
September 9, 2012

CHEMISTRY
This link is helpful: http://chemistry.csudh.edu/faculty/noel/CHE317L/Extraction%20Experiment.htm read up to X = 8.0 grams of A extracted into the ether. For your question, you would subtract x from 9.81g after you solve for x.
September 9, 2012

chemistry
volume of sphere = 4/3 π r^3 density = mass/volume
September 8, 2012

chemistry
1)look at the units. see how this cancels out to give you columb, the SI unit of quantity of electric charge (columb/sec)*(sec) = ? columb 2) divide ? columb by charge on an electron
September 8, 2012

Chemistry
molality = moles of solute/kilograms of solvent notice how the units cancel out to moles of solute: (moles of solute/kg of solvent)*(kg)= moles of solute
September 8, 2012

Biology
Molarity (M) = mol / liter = moles/ 1000ml Therefore, 0.8M = 0.8 mol/ 1000 ml Know that the units cancel out to mol: (0.8 mol/1000 ml)*(150ml) = ? mol if you multipy ? mol by the molar mass of NaCl , you would end up with grams of NaCl (? mol)*(__ g/ mol)= ___g NaCl
September 8, 2012

Chemistry
http://www.jiskha.com/display.cgi?id=1347138502
September 8, 2012

chemistry
Read Freezing Point Depression Section: http://www.chemistryexplained.com/Ce-Co/Colligative-Properties.html
September 8, 2012

Geometry
Angle A is 30 more than twice angle B can be written as A = 2B + 30 Because we know that angle A and angle B form a linear pair, we know that A + B = 180 Plug the first equation into the second equation and solve for A. Once you solve for A, plug the know A value into into ...
September 8, 2012

chemistry
2S + 3O2 -> 2SO3 This example should help you. http://www.chem.tamu.edu/class/majors/tutorialnotefiles/limiting.htm
September 4, 2012

chemistry
1)Convert 25* Celsius to Kelvin. Celsius + 273.15 = Kelvin Plug the given numbers in this formula and solve for final temperature. q = mcΔT where q = heat energy m = mass c = specific heat ΔT = change in temperature = final temperature - initial temperature
September 2, 2012

MATHS
Hint: Two opposite angles of a parallelogram are congruent, meaning they are equal.
June 29, 2012

geometry
volume = length x weight x height the ends of the box are square, so height = weight volume = length x height x height plug in the numbers and solve for height
June 29, 2012

probability
Yes
June 29, 2012

maths
If 3/5 of the students (you can also think this as 3 out of 5 students) are girls, how many of the 5 students are boys? Present in fraction form. This is the simplified or reduced fraction. fraction = part/whole = number of boys/ number of students Set the reduced fraction = ...
June 29, 2012

Science
http://www.biologyjunction.com/taxonomy_notes_bi.htm
May 9, 2012

Science
Here's the chemical equation, but you need to balance it still: CuCl2 + NaNO3 => Cu(NO3)2 + NaCl The reactant that produces the lesser amount of product is the limiting reagent. Here's an example problem: http://www.chem.tamu.edu/class/majors/tutorialnotefiles/...
May 9, 2012

statistics
https://statistics.laerd.com/statistical-guides/standard-score-3.php
May 9, 2012

chemistry
Independent variable goes on the x-axis, and the dependent variable goes on the y-axis.
May 9, 2012

Genral Chemistry
http://chemistry.about.com/od/workedchemistryproblems/a/phstrongbase.htm This example should help you with your question.
April 17, 2012

Chemistry
To convert from .95 mol Al to mol H, you would use the coefficients in the balanced equation. Here's an example of a stoichiometry problem: http://www.jiskha.com/science/chemistry/stoichiometry.html
March 9, 2012

Chemistry
The maximum number of moles of AgCl that could be obtained would be the number of moles of AgCl produced by the limiting reagent.
March 9, 2012

geometry
ball = sphere Find the surface area of a sphere. A = 4*pi*(radius)^2 source: http://math.about.com/od/formulas/ss/surfaceareavol.htm
March 8, 2012

Chemistry
1) impure anything should be depressed and/or broad compared to literature melting range 2) pure anything should be at the literature melting range
March 8, 2012

Chemistry
Here are the rules for counting significant figures: http://academic.umf.maine.edu/magri/PUBLIC.acd/tools/SigFigsAndRounding.html
March 8, 2012

Chemistry
a)% recovery = [final mass/ initial mass] x 100% b) hint: think about the state of matter of the impurities
March 8, 2012

physics
See example 2: http://www.cliffsnotes.com/study_guide/Dynamics.topicArticleId-10453,articleId-10417.html
January 4, 2012

7th Grade Math
Distance= rate*time Distance upstream = distance downstream Time should be converted to hour b/c the units for rate is in /hour. We know the total time so assign one of the times x (upstream time b/c you would only have to solve for x to get its time) and the other the total ...
January 4, 2012

science
Density = mass/ volume
December 20, 2011

math
plug in n for 15 15+(-12) which is the same thing as: 15-12 = ?
December 20, 2011

chem
Find the molecular weight of AgCl2. That's grams/ 1 mol AgCl2. To convert: (3.6 mol AgCl2)(___g/ 1 mol AgCl2) Notice how the mol unit cancels out and you're only left with the desired grams unit.
December 15, 2011

chemistry
PV=nRT Solve for V. Here's a sample problem: http://faculty.clintoncc.suny.edu/faculty/Mike.Lawliss/My_webpage/map/pvnrt.htm
December 15, 2011

statistics
z = (score - mean)/ standard deviation 1)Refer to the z-score chart. Look up the +z-score corresponding to a p-value of ~.8 2)Find score and round up to the nearest 10 interval.
December 15, 2011

statistics (repeat)
http://www.jiskha.com/display.cgi?id=1323980774
December 15, 2011

physics
Force = (mass)*(acceleration)
October 30, 2011

chemistry
Π = iMRT where Π = osmotic pressure in atm i = van 't Hoff factor of the solute. ((Broken Link Removed) M = molar concentration in mol/L R = universal gas constant = 0.08206 L·atm/mol·K T = absolute temperature in K
October 29, 2011

Chemistry
http://www.jiskha.com/display.cgi?id=1319910648
October 29, 2011

physics
Force = (mass)*(acceleration)
October 2, 2011

MATH
x= # kg of cashews 10-x = # kg of pecans ($8)(x) + ($9)(10-x) = $8.40 here's a similar problem: http://www.calculatorsoup.com/calculators/wordproblems/algebrawordproblem1.php
October 2, 2011

chemistry
2H2+O2->2H2O -convert g of H2 and of O2 each to mol H2O steps 2 & 3: http://www.jiskha.com/science/chemistry/stoichiometry.html -convert the one with lower mol H2O to grams -the reactant that produces the lesser amount of H2O is the limiting reagent and is the mass of water...
October 2, 2011

statistics
Find the p-value after you find the z-score. z = (x - μ) / σ http://www.ehow.com/how_4555631_calculate-zscore-statistics.html here's an example how to find the p-value: https://controls.engin.umich.edu/wiki/images/3/3e/Screen_shot_z-score.JPG The z-score is 1.13 ...
September 30, 2011

Physics
due north- aka find y-component due east- aka find x-component http://zonalandeducation.com/mstm/physics/mechanics/vectors/findingComponents/findingComponents.htm
September 14, 2011

chemistry
rule #2: http://www.seas.upenn.edu/~chem101/oxidationstates.html
September 13, 2011

chemistry
q = m x Cg x (Tf - Ti) http://www.ausetute.com.au/heatcapa.html
September 4, 2011

Chemistry
Do the following: 1) Balance the following: H2 + O2 -> H2O 2) Find the limiting reagent. The reactant (H2 or O2?) that produces the lesser amount of the product (H2O). http://www.chem.tamu.edu/class/majors/tutorialnotefiles/limiting.htm
September 4, 2011

chemistry
manipulate the units so that you end up with meters: (g)*(m/g) then convert to cm by multiply by 100
September 2, 2011

Chemistry
density = mass/volume mass = (density)*(volume)
September 1, 2011

Calculating Averages?
http://www.algebralab.org/practice/practice.aspx?file=algebra_averageatomicmass.xml
August 29, 2011

geometry
solve for x. (2x-3)=0 (x-5)=0 (4x+7)=0
August 29, 2011

statistics
Use the Empirical Rule. http://www.oswego.edu/~srp/stats/6895997.htm
August 29, 2011

geometry
http://arnoldkling.com/econ/GMU/growthArith.htm
August 27, 2011

statistics
http://www.ehow.com/how_4555631_calculate-zscore-statistics.html
August 27, 2011

Statistics
http://www.jiskha.com/display.cgi?id=1314477006
August 27, 2011

statistics
http://www.jiskha.com/display.cgi?id=1314477006
August 27, 2011

statistic
c is correct, but what about a and b? are they possible as well? What is a mode? Here are some examples: http://www.mathsisfun.com/mode.html http://www.purplemath.com/modules/meanmode.htm
August 21, 2011

physical scince
hint: density=mass/volume
August 21, 2011

statsitsc
http://stattrek.com/lesson2/normal.aspx
August 20, 2011

physics
Take the negative reciprocal of the slope. http://www.algebralab.org/lessons/lesson.aspx?file=geometry_coordparallelperpendicular.xml
August 19, 2011

algebra
Solve for x. This will give you a vertical line at whatever x value you get. Does it intersect the y axis? If not, there's no y-intercept.
August 19, 2011

statistics
hint: what does small sample size tell you about the standard deviation or variance (is it small or large?)?
August 2, 2011

Algebra
-10y/13=-4/3 cross multiply and solve for y (-10y)*(3)=(-4)*(13) http://www.mathsisfun.com/algebra/cross-multiply.html
August 2, 2011

chemistry
Molarity = moles of solute/ liter of solution convert g to mol by dividing molar mass 10g NaOH -> __ mol NaOH
July 14, 2011

chemistry
http://www.ausetute.com.au/heatcapa.html
July 14, 2011

math
5cm/20km = 17cm/x km cross multiply: 5x = (20)(17) solve for x.
July 12, 2011

chemistry
http://chemistry.bd.psu.edu/jircitano/soluble.html
July 4, 2011

math
http://www.mathsisfun.com/greatest-common-factor.html
July 4, 2011

Science
http://www.jiskha.com/science/chemistry/stoichiometry.html
July 4, 2011

Algebra 1
combine like terms: http://www.purplemath.com/modules/polydefs2.htm
June 29, 2011

algebra/trignometry
Draw a triangle. Label the angles x, y, and z. Label what are given. Determine whether what you have is SOH, CAH, or TOA. http://www.mathsisfun.com/algebra/sohcahtoa.html
June 29, 2011

multiplying decimals
http://www.mathsisfun.com/multiplying-decimals.html
June 29, 2011

arithmetic
http://www.mathwarehouse.com/algebra/averages/
June 29, 2011

chemistry
molality = moles of solute/ kg of solvent
June 26, 2011

statistics
sigma = sqrt [np(1-p)] http://stattrek.com/Lesson2/Binomial.aspx
June 25, 2011

calculus
Look at example 2: http://tutorial.math.lamar.edu/Classes/CalcI/DefnOfDerivative.aspx
June 23, 2011

chemistry
http://www.ndt-ed.org/EducationResources/HighSchool/Radiography/atomicmassnumber.htm
June 21, 2011

Chemistry
Calculate the Empirical Formula given 16.37% H and (100-16.37)% C. Refer to Example #2. http://www.chem.tamu.edu/class/majors/tutorialnotefiles/empirical.htm Use PV=nRT. n=mass/molar mass units: P=atm, V=L, T=K R=0.08206 atm*L/mol*k Solve for molar mass and calculate the ...
June 21, 2011

MATH
(1/6)^(3x) = 36 ^(2-x) hint: 1/6 = 6^(-1) & 36 = 6^2
June 15, 2011

MATH
(-1/18)*(r)=(1/6) find r. geometric progression: ar^(n-1) a=1st term r=ratio n=nth term http://www.mathsrevision.net/alevel/pages.php?page=33
June 15, 2011

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