Answers created by Jacob T.

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• What intermolecular forces are present in #CO_2#?
  
• What is the angle between #<-1,8,2 ># and #< 0,-3,1>#?
  
• If air is #20.9%# oxygen by volume, 1. How many liters of air at #25.5^@ "C"# and #1.000# atm are needed for the complete combustion of #15.0 "kg"# of propane vapor? 2. What volume of each product is produced?
  
• If the EPA allowable limit is 30 micrograms per liter how many atoms of uranium are present in 1 L?
  
• How do instant icepacks work in relation to specific heat capacity?
  
• What is the slope of the line normal to the tangent line of #f(x) = x^2-3sqrtx # at # x= 3 #?
  
• What is the pH of [H3O+]=1.0 M? How do I solve for it?
  
• In a Young’s double slit experiment two rays of monochromatic light emerge from the slits and meet at a point on a distant screen.The point on the screen where these two rays meet is the eighth order bright fringe...?
  
• How does energy relate to waves?
  
• Why will OH- not discharge?
  
• Find the ionization energy of #"C"^(5+)#?
  
• An object travels North at # 8 m/s# for #3 s# and then travels South at # 7 m/s# for # 8 s#. What are the object's average speed and velocity?
  
• A 1.0 kW heater supplies energy to a liquid of mass 0.50 kg. The temperature of the liquid changes by 80 K in a time of 200 s. The specific heat capacity of the liquid is 4.0 kJ kg–1K–1. What is the average power lost by the liquid?
  
• A ball with a mass of #5 kg # and velocity of #2 m/s# collides with a second ball with a mass of #6 kg# and velocity of #- 3 m/s#. If #75%# of the kinetic energy is lost, what are the final velocities of the balls?
  
• What is the moment of inertia of a pendulum with a mass of #8 kg# that is #1 m# from the pivot?
  
• Water is under 122.5m . When a stone throw sound is heard after 5.36 second .so what is the velocity of sound?
  
• Define auto redox reaction. Balance the following equation by ion-electron or oxidation number method: #"K"_2"Cr"_2"O"_7(aq) + "FeSO"_4(aq) + "H"_2"SO"_4(aq) -> "K"_2"SO"_4(aq) + "Cr"_2("SO"_4)_3(s) + "Fe"_2("SO"_4)_3(s) + "H"_2"O"(l)#?
  
• What chemical or physical reaction occurs in a flame?
  
• How do you graph #y = -2|x-4|+4#?
  
• Identify the equation for which #K_c = ["Ni"^(3+)]["Cl"^-]^3#.?
  
• How many moles of oxygen are produced by the decompositon of 6.0 moles of potassium chlorate, KCLO3?
  
• Write the complete stoichiometric equation for the reaction?
  
• How do you solve #6+ \frac { 1 } { 5 } q = 1 0#?
  
• What are continuous energy spectra?
  
• How do hot packs work?
  
• How to draw the potential energy diagram for this reaction?
  
• Pivalic acid is monoprotic weak acid. A 0.100mol/L solution of pivalic acid has pH=3.00 . what is pH of 0.100mol/L sodium pivalate at same temperature ?
  
• Calculate the #"pH"# change in a buffer solution upon the addition of strong acids / base of known concentration?
  
• What is the equilibrium concentration of C2O42− in a 0.20 M solution of oxalic acid?
  
• How do you write an equation of a circle that passes through the points (3,6), (-1,-2), and (6,5)?
  
• Which electronic transition in a hydrogen atom will require the largest amount of energy ? (1) n = 1 to n = 2 (2) n = 2 to n = 4 (3) n = 5 to n = 1 (4) n = 3 to n = 2?
  
• Draw a diagram for this Galvanic cell, labeling the electron flow, the anode and cathode, and the positive and negative sides of the Galvanic cell?
  
• Physicists talk about the electron in a hydrogen atom being in an “energy well”. Explain why the difference in energy, ∆E, is negative. What does a negative ∆E represent?
  
• The volume of a sample of hydrogen gas was decreased from 13.16 L to 6.45 L at constant temperature. If the final pressure exerted by the hydrogen gas sample was 7.73 atm, what pressure did the hydrogen gas exert before its volume was decreased?
  
• Which has more entropy egg or boiled egg?
  
• What is the pOH of a solution that has OH concentration equal to #1.36×10^-10" mol"*"dm"^(-3)# ?
  
• What are the quantum numbers of carbon?
  
• Bonding in silicon?
  
• How can I calculate enthalpy of fusion?
  
• What bonding types affect the melting and boiling points of Alkaline Earth Metals?
  
• When a chemical loses a hydrogen ion, is it behaving as a chemical or a base? What is meant by "behaves as"?
  
• Which category would polar molecules fall under: Arrhenius Acid/Base Bronsted-Lowry Acid/Base Lewis Acid/Base?
  
• The minimum energy needed to dissociate iodine molecules, I2, is 151 kJ/mol. What is the wavelength of photons (in nm) that supplies this energy, assuming each bond dissociated by absorbing one photon?
  
• What is the weight in grams of silver displaced by 0.1 mole of magnesium?
  
• Two opposite sides of a parallelogram each have a length of #9 #. If one corner of the parallelogram has an angle of #(3pi)/8 # and the parallelogram's area is #72 #, how long are the other two sides?
  
• Why there are some exceptions for writing electronic configuration for copper and chromium ?
  
• How do you solve #y=|10x-2|-7#?
  
• How many of valence electrons do the elements in column 4 have? Are these elements very reactive?
  
• How do you determine the electron configuration of Fe?
  
• How many types of quarks are there and what are their names?
  
• How do you graph two cycles of #y=2tan(3theta)#?
  
• Point A is at #(4 ,-2 )# and point B is at #(2 ,-3 )#. Point A is rotated #pi/2 # clockwise about the origin. What are the new coordinates of point A and by how much has the distance between points A and B changed?
  
• What number of unpaired electrons are there in Xe atom?
  
• What are the asymptotes of #cot(x+90°)#?
  
• Use a calculator to solve the equation on the interval [0, 2π). (see picture for more info). Thanks a lot!?!
  
• How do you verify the identify #sinthetatantheta+costheta=sectheta#?
  
• A cone has a height of #12 cm# and its base has a radius of #8 cm#. If the cone is horizontally cut into two segments #4 cm# from the base, what would the surface area of the bottom segment be?
  
• How do you find the value of #cos(pi/4)#?
  
• Two angles are supplementary. The larger angle is 86 degrees larger then the smaller angle. Find the measure of both angles?
  
• Why does ionization energy decrease as you move down a group in the periodic table?
  
• Two particles with charges #q_1# and #q_2# are separated by distance d. Rank these scenarios according to the magnitude of the electrostatic (coulombic) potential energy. Ignore sign. Rank from height to lowest energy?
  
• What are the asymptotes of #y=4/(x-1)# and how do you graph the function?
  
• Question #2eafd
  
• A Force of 15 N accelerates an object by 2m/s2. what force is needed to give the same object an acceleration of 6m/s2?
  
• A parallelogram has sides with lengths of #16 # and #9 #. If the parallelogram's area is #81 #, what is the length of its longest diagonal?
  
• How do you graph and list the amplitude, period, phase shift for #y=sin((2pi)/3(x-1/2))#?
  
• How do you find the maximum, minimum and inflection points and concavity for the function #F(x) = 2x(x-4)^3#?
  
• Question #77fa3
  
• Question #66e91
  
• Question #164a5
  
• How do you solve #(x-4)^5(x-5)(x+3)<0# using a sign chart?
  
• A line segment is bisected by a line with the equation # - 3 y + 2 x = 2 #. If one end of the line segment is at #( 7 , 9 )#, where is the other end?
  
• What do polar covalent bonds result from?
  
• What is the standard form of #y= (2x+4)^2-(x-7)^2 #?
  
• If #"0.50 M"# of #"NH"_4"OH"# were to dissociate in water, and #K_b = 1.773 xx 10^(-5)#, what is the resultant #"pH"# at equilibrium?
  
• Consider the equilibrium system #CO(g) + Fe_3O_4(s) ⇌ CO_2(g) + 3FeO(s)# How does the equilibrium position shift as a result of each of the following disturbances?
  
• Question #7099f
  
• How do you evaluate the integral #int x^2e^x#?
  
• Question #98339
  
• How do you simplify #\root [ 3] { 32x ^ { 12} y z ^ { 6} }#?
  
• How do you find the surface area of a closed rectangular box given Length=6, Width=5, Height=3?
  
• How do you find the amplitude, period, vertical and phase shift and graph #y=sin(theta-pi/4)#?
  
• What is the number of pi bonds in the molecule below?
  
• Question #302ef
  
• A solution contains #[OH^-] = 4.0 times 10^-5# #M#, what is the concentration of #[H_3O^+]#?
  
• Which silicate minerals are the main component of most of Earth's rocks?
  
• Five books of different heights are arranged in a row. Find the probability that (a) the tallest book is at the right end. (b) the tallest and shortest books occupy the end position (c) the tallest and shortest books are together ?
  
• How do you evaluate the limit of #lim (2h^3-h^2+5h)/h# as #h->0#?
  
• Question #4d7ec
  
• How do you divide #( -7i-3) / ( 9 i -4 )# in trigonometric form?
  
• How do you find the inverse of #f(x)=sqrt(x-3)#?
  
• Question #fca37
  
• What are the oxidation and reduction half-reactions for #Cr+F_2 -> CrF_3#?
  
• Question #d940c
  
• Where do gases dissolve most easily?
  
• Question #b98fe
  
• What are the asymptotes of #y=1/(x-2)+1# and how do you graph the function?
  
• The formula for the oxalate ion is #C_2O_4^(2-)#. What would you predict the formula for oxalic acid to be?
  
• Question #c297b
  
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