Questions asked by Ball_is_Life

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• Which following pairs of atoms, have a lower electron affinity? a) Ca,K b) I,F c) Li, Ra. I seriously don't know anything about electron affinity all ik that it can buy another element
  
• Which following pairs of atoms, have a lower electron affinity? a) Ca,K b) I,F c) Li, Ra.Is it like this if an element has more protons than the other element it is goign to have more atomic radius therefore, it will also have more electron affinity.
  
• Which of the entities have higher atomic radius? a) Ca, Ca2+ b) S, S2-. Please explain it?
  
• I have a test for chemistry tom and my teacher is going to give me element and I have to tell if it's either polar or non-polar how do i tell? I know that I use the difference of electronegativity?
  
• I need help with lewis diagram of HCN - which one do I put in the middle?
  
• What is the Name for PbHPO4?
  
• What is the IUPAC(chemical name) of PH3? Wouldn't it be phosphorous hydride because it's not molecular(there is a metal and non-metal). I searched online, it says it's Phosphorous trihydride?
  
• Is H2S dihydrogen monosulfide or dihydrogen sulfide, please explain?
  
• Calculate the amount of (mol) of Rh in 1.69g of Rh. If the molar mass is 102.90?
  
• For decomposition: why does 2KClO3 become ---> 2KCl+3O2?
  
• Determine the number of potassium ions in a 3.05 moles of K+?
  
• A) If y=x^2+kx+3, determine the value(s) of k for which the min value of the function is an integer?
  
• The function #h(t)=-5t^2+20t+2# gives the approximate height, #h# meters, of a thrown football as a function of the time, #t# seconds, since it was thrown. The ball hit the ground before a receiver could get near it. a) How long was the ball in the air?
  
• I need help with Subscripts for empirical formula, how do i know which number to multiply so that I get a whole number?
  
• For % Composition, when to use mass method and when to use formula method Any hint or trick?
  
• How many moles of sulfur hexafluoride are present in 2.56E21 molecules of this compound?
  
• What is the molar Mass of Fe3+, how many ions does it have and what is the mass of ion in one mole of compound?
  
• How many grams of Al are required to completely react with 81.2 g of MnO2. What is the mole ratio between MnO2 and Al in the balanced equation? 3MnO2 +4Al--> 3Mn+2Al2O3?
  
• I did a Magnesium Oxide Lab.Magnesium often reacts with nitrogen in the air. If some of the magnesium had reacted with the nitrogen, would it make the % composition of ur sample higher or lower than it should be? Explain (Hint-Try a sample calculation).
  
• Calculate the % composition (by mass) of Mg in Mg3(AsO4)2?
  
• 2C6H14+19O2---->12CO2+14H2O What mass of oxygen (O2) is required to react completely with 11.7g of C6H14?
  
• I did a Magnesium Oxide Lab.Magnesium often reacts with nitrogen in the air. If some of the magnesium had reacted with the nitrogen, would it make the % composition of ur sample higher or lower than it should be? Explain (Hint-Try a sample calculation).
  
• Sometimes the magnesium is polished to remove any white film on its surface before beginning the experiment?
  
• For the following reaction: BaO+H2SO4--> BaSO4 +H2O;(Assume that the other reactant is in excess) a) How much BaSO4 can be formed from 196 g of H2SO4 b) If 81 g of water is formed during this reaction, how much BaO was used?
  
• Predict the effect of each of the following by mass of water in the hydrate and the chemical of the hydrate? a) not heating the hydrate enough b) overheating the hydrate and producing some copper (ii) oxide
  
• How do u know if an equation is combined transformation is it when you have all the variables a, k, d and c?
  
• 2AgCl+4NaOH+Zn---->Na2Zn(OH)4+2Ag+2NaCl which one of them is the limiting reagent we are not given any amounts for the reactants?
  
• N has a mass of 26.19 H has a mass of 8.39 g and Cl has a mass of 65.42. Find the emperical formula?
  
• N has a mass of 26.19g H has a mass of 8.39g Cl has a mass of 65.42g mole for N is 26.19/14=1.87, mole for H is 8.39/1=8.39 mole for Cl is 65.42/35.5=1.84. Mole ratio for N is 1.87/1.84 is 1, H is 4.55 and for Cl is 1.What is the empirical formula?
  
• How do you know if a triangle is ambiguous?
  
• I am doing trig and i have an upcoming quest, for word problems how do i know if it's a trig ratio word problem or cosine/sine law word problem?
  
• Is there an easy way i can find the related acute angle(reference angle) when give any degree? If not then can u tell me a method that is proper so that i can do good on reference angle
  
• what type of solution will be created when 35 grams of Nh4Cl is added to 25 ml of water at 80 Celsius?
  
• Determine two other angles that have the same trigonometric function value: a) sin 47 b) cos 56. For a, the value is 0.731 and for b) it's 0.559?
  
• For example, i am given a problem, how do ik if it' a diluton problem. I know that for dilution the concentration decreases and the volume increases?
  
• Aluminum reacts with hydrochloric acid according to the equation. #2Al_((g)) + 6HCl_((aq)) -> 2AlCl_(3(aq)) +3H_(2(g))#. Calculate the volume of 1.50mol/L hydrochloric acid that is required for 5.40g of Aluminum to react completey?
  
• I need help how do i determine the phase shift when i am given a graph, i need it for sinusoidal function. I know how to figure everything except phase shift(d)?
  
• I am doing polynomial functions, for example i have two roots 0 and 2 how would i make it a polynomial function?
  
• Degree of 3, positive leading coefficient, 2 zeros, 2 turning points. I sketched the condition and the zeros are -1 and 1 and the y-int i made it as 2. How do i make a polynomial function?
  
• How do you differentiate between 1D motion and 2D motion?
  
• Is the acceleration due to gravity in projectile motion always negative? please explain
  
• For projectile motion, for example if i set my coordinate system as positive so that means that the acceleration and the max height (dy) is going to be positive?
  
• A rope exerts a force of magnitude 28N, at an angle 29 degree above the horizontal, on a box at rest on horizontal floor. The coefficients of friction between the box and the floor are static friction=0.45 and kinetic friction=0.41?
  
• How do I know when the Fnet in y direction is 0, any hint i have a test tomorrow?
  
• How do I know when the Fnet in x direction is 0?
  
• How do you tell if it's a vertical asymptote function or a horizontal asymptote function?
  
• The track near the top of your favorite roller coaster is looped with the diameter of 20m. When you are at the top, you feel as if you weight one-third of your true weight.How fast is the roller coaster moving?
  
• Is there an easy way to convert degrees to radians?
  
• How do ik if a question is an elastic collision or inelastic collision? How do i distinguish the difference between them when i am given a question on the test?
  
• I am doing catapult as my final project. I need help with this que: State the method used to store the potential energy and why you chose this method? Please help me
  
• Given that sin(θ)=-1/squareroot2,how do you find the two possible angles for θ, given that −π<θ≤2π?
  
• What is the hybridization for C2H6? my teacher wrote sp-s sigma bond [C-H] and sp-sp sigma bond[C-C]
  
• How to tell if a central element in a molecule needs to form hybridized orbitals?
  
• What is C3H4's shape called? Is it trigonal planar
  
• When do we use wedges and lines for VSEPR?
  
• How do i draw isomers for alkanes and tell the longest chain for alkanes . i was absent during the lesson?
  
• Sketch 4,6-diethyl-5-propylnonane and sketch 2,cyclopropylpropane?
  
• How do i determine the difference between substitution and elimination reaction?
  
• Why does H bind to the first Carbon, i know that H binds to the C that already has more H's attached to it. But i still dont get it because the first Carbon has only two hydrogens?
  
• Forming N-methyl-2-aminobutane from 2-aminobutane?
  
• A farmer wants to enclose a 450,000m^2 rectangular field with fence. She then wants to sub-divide this field into three smaller fields by placing additional lengths of fence parallel to one of the side. How can she do this so that she minimizes the cost?
  
• Is the following statement True or False: " f'(x) exists for all real numbers x and f'(x) is never 0, then f(1) can not be equal to f(5). "?
  
• Find f(x) if f'(x)= #(e^(2x) +4e^-x)/e^x# and f(ln2)=2. Do u just find the anti-derivative for numerator and denominator separately?
  
• Evaluate the following term #int_0^(3pi/2) 5|sinx|dx# .How would i do this using FTC2(F(b)-F(a))?
  
• Evaluate the following: #int_(pi/6)^(pi/2)(cscxcotx)dx# I know that we are suppose to find the anti-derivative of cscxcotx, but i dont know how to?
  
• Evaluate the following, #int_0^1 (x^e +e^x) dx#. I know the anti-derivative of x^e is #x^(e+1)/(e+1)#. How would i solve this,would i use F(b) +F(a)?
  
• Evaluate the indefinite integral: #int sin 35t sec^2 (cos 35t)dt#?
  
• Evaluate the integral using subsitution rule #int cos^3xsinx dx#?
  
• Evaluate the following integral using substitution rule, #int x(2x+5)^8 dx# Online i saw people solving for x too, i dont get that part?
  
• Evaluate the following integral # x^3sqrt(1+x^2)#?
  
• #int_0^x (t^2 -6t+8) dt# where x belongs to all real number [0,infinity). Find the intervals where the function is decreasing?
  
• Find the area, for #y=1/x#, #y=x# and #y=x/4# (x>0) How would i find a and b intervals when given more than two functions?
  
• Integrate #int (xe^(2x))/(2x+1)^2 dx#. I'm having difficulty integration it second time(integration by parts)?
  
• Integrate the following #int sqrt(x^2+81) dx#?
  
• Evaluate the integral #int cos^4(2t) dt#?
  
• #int sqrt(9-5x^2) dx# ?
  
• Integrate the following #int t/(t^4 +2) dt #?
  
• Solve the differential equation #dy/dx = 5x sqrt(y)# where y!=0?
  
• Solve the differential equation #dy/dt = 4 sqrt(yt)# y(1)=6?
  
• Find the limit of the sequence #ln(n^2+2) -1/2ln(n^4+4)#. Does it converge to 0?
  
• Does the function converge or diverge #1/((x-1)(x^2+1)) #on the bound [2,infinity]?
  
• Solve the differential equation #xyy' +xyy'= y^2 +1#?
  
• Determine whether the series # sum_(n=1)^oo (2n^2 +3n)/sqrt(5+n^5)# is convergent or divergent. How do i tell which comparison test to use?
  
• Find the limit as x approaches 3 from the right #ln(x^2-9)#?
  
• #sum_(n=0)^oo 5^n/(3^n +4^n)#. Does the series converge or diverge?
  
• #sum_(n=1)^oo sin(n)/(n!)# How would i find if it converges or diverges?
  
• Suppose x,y are positive real numbers. Show that #(x^2-y^2)(1/y - 1/x) >=0#?
  
• Solving using geometric Series, #sqrt(2)/2, 1/2, 2^(3/2)/8,1/4#?
  
• How do i solve for z for the following equation: #z(1+i) = bar(z) + (3+2i)#. I know that conjugate of z is a-bi?