Questions asked by Jackie

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• How do you find the first conversion in the factor label method?
  
• Which is more important in determining if a molecule is polar, symmetry or the difference of electronegativity? For example, CF4 is tetrahedral so it's symmetrical but C and F have a difference of 1.5 in electronegativity, which is more than .4
  
• When Iodine (I2) is mixed with water, the water dissolves some iodine by forming a temporary charge. Does the oxygen from water bond with the Iodine or does the hydrogen?
  
• How can a paperclip float on the surface of water?
  
• Can you please explain how to use bond energies to determine the change in heat for reactions, or maybe post a link to a video on thermodynamics/ thermochemistry?
  
• Can you please explain the rational root theorem and the factor theorem?
  
• I'm only in algebra II but we're learning the rational root theorem and the factor theorem, apparently those topics fall under calculus. Can someone please explain them to me and provide examples?
  
• Can someone please explain how to find the amount of energy released in a chemical reaction? What formulas do I use and how do I use them?
  
• A supply of NaOH contains the contaminants NaCl and MgCl2. A 4.9995g sample of this material is dissolved and diluted to 500mL, 20mL of this is titrated with 22.26mL of a 0.1989M solution of HCl. What is the percent NaOH of the original solution?
  
• How do you solve for Ka when you only have molarity of the acid and pH?
  
• How can an object have a negative acceleration while speeding up and a positive acceleration while slowing down? Please explain using easy terms, I do not understand the way my textbook explains it.
  
• A ball is launched vertically upwards from ground level with an initial velocity of 30 m/s. About how much time elapses before it reaches the ground? About what maximum altitude does it reach above ground? Please explain I'm so confused.
  
• If I'm given 6 position vs time graphs and I need to put their average velocities and average speeds in order from greatest to least. What is the difference between the two and how do I calculate them? Please help my test is tomorrow.
  
• Can someone please explain to me what this question is asking and how I should go about solving it: Of all the lines tangent to the curve f(x)=6/(x^2+3) find the x-coordinate of the tangent lines of minimum and maximum slope?
  
• How do you write the piecewise function for |f(x)| and f(|x|) if, for example, its f(x)=X^2-9?
  
• How do I find the sum of the series: 4+5+6+8+9+10+12+13+14+⋯+168+169+170. since D is changing from +1, +1 to +2 ?
  
• How do you find the instantaneous rate of change of #lnx#? please explain the steps
  
• The train tracks on which a train travels exert a 2.0×105N friction force on the train, causing it to stop in 44 s. What the average force needed to stop the train in 25 s?
  
• What force is required to stop a 1600-kg car in a distance of 0.20 m if it is initially moving at 2.2 m/s? What if the car is moving at 4.5 m/s?
  
• How do you prove that sigma ar^k-1 at k=1 to the n terms = a(1-r^n)/1-r ??
  
• How do you find the instantaneous rate of change of #2/(sqrt(x) + 1)# using the #lim_(h->0)# method?
  
• A cart of mass 20kg rolls with negligible friction down its track. At point A its speed is 4m/s. If point A is 5m higher than point b, what is its kinetic energy at point B?
  
• A block of mass .5kg and speed 5m/s slides across a horizontal frictionless surface and hits a spring of force constant 100N/m. How much will the spring be compressed from its initial relaxed length at the instant the block is brought to rest?
  
• Ball with mass .5kg is released from rest at point A, 5m above the bottom of the tank, it falls through the tank of oil and at point B it is 2m above the bottom with speed of 4m/s. What is the work done by Force of friction between A and B?
  
• How do I find the point on the graph f(x)=sqrt(x) closest to the point (4,0)? Please show the work
  
• How do you find the length of x and y if there is a circle, x is the arc length, there is an angle of 120 degrees and y is the hypotenuse?
  
• Can someone please fully explain the affect of temperature on equilibrium using Le Chatelier's principle? Also, how does kinetic energy of the mc relate to this? Thanks.
  
• I understand that when you increase pressure for a reaction at equilibrium it shifts to the side that makes less moles of product and when you decrease pressure, it shifts to the side that makes more moles. Why does the reaction shift in these directions?
  
• Calculate pOH of a .1540 M solution of phenol (C6H5OH) Ka=1.61x10^-10?
  
• A solution is made by mixing 500mL of .3M benzoic acid and 400mL of .25M benzoate. What will the pH of the solution be?. Specifically, how do I find the concentration of the acid and base to use in the equation #pH=pKa +log( ([A^(-)])/([HA]))# ?
  
• Given the half reactions Au+3 +3e- -> Au and Sn+4 +2e- -> Sn+2 in a galvanic cell, what is the voltage if [Au+3]=1.45M [Sn+4]=.50M and [Sn+2]=.87M?
  
• A cheetah accelerates at 13 m/s^2 on smooth ground in a straight line which forms an angle of 33 degrees (with x as a reference direction) after 2.3 seconds the velocity of the animal in that direction will be??