Questions asked by Denise Granger

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• What are the most common questions about moles that often comes out in the exams?
  
• What is a polyatomic ion?
  
• What does electronegativity have to do with bond polarity?
  
• Can someone please explain the basics of hydrogen bonding?
  
• Can someone please explain on the basics of stoichometry?
  
• What is the magnitude of numbers all about?
  
• How do you factor #8+z^6#? There is no GCF to be factor out, so is there another method to complete this?
  
• 2 C8H18(l) + 25 O2(g) ----> 16 CO2(g) + 18 H2O(g) If 4.00 moles of gasoline are burned, what volume of oxygen is needed if the pressure is 0.953 atm, and the temperature is 35.0°C?
  
• 2 C8H18(l) + 25 O2(g) #-># 16 CO2(g) + 18 H2O(g) If you burned one gallon of gas (C8H18) (approximately 4000 grams), how many liters of carbon dioxide would be produced at a temperature of 21.0°C and a pressure of 1.00 atm?
  
• 2 Cl2(g) + C2H2(g) ‡ C2H2Cl4(l) How many liters of chlorine will be needed to make 75.0 grams of C2H2Cl4? Pressure: 1 atm Temperature: 298K
  
• I have conducted a calorimetry experiment on the latent fusion heat of ice. Even when the procedure is followed throughly, I keep getting a value that is far off from the actual value. And this continues even after the experiment is repeated, why?
  
• Which molecule would have the largest dispersion molecules forces between other identical? (A) CH4 (B) C3H8 (C) C2H6 (D) C2H4 (E) C4H10
  
• A calorimeter temperature increases by 0.45 °C when 30 J of energy is added to it by electrical heating. When 0.10 grams of HCl is neutralized in the same calorimeter, the temperature increased by 7.3 °C. What is the ΔH of neutralization of HCl in unit?
  
• Is this reaction likely to be spontaneous? 2Li(s) + 2H2O(g) ----> 2LiOH(s) + H2(g) ΔH = -222 kJ
  
• A 154 g sample of water at 0oC freezes into ice at °C How many joules (J) of energy are needed for the phase change?
  
• 11. 135 g of aluminum (initially at #"400"^("o")"C"#) are mixed with an unknown mass of water (initially at #"25"^("o")"C"#). When thermal equilibrium is reached, the system has a temperature of #"80"^("o")"C"#. Find the mass of the water?
  
• For the oxidation of ammonia it was found that the rate of formation of N2 was 0.27 mol L–1 s–1. 4NH3+3O2→2N2+6H2O At what rate was water being formed?
  
• How are dynamic equilibrium and reversible reactions connected to one another?
  
• 1. For the reaction, #PCl_(3(g))+Cl_(2(g)) rightleftharpoons PCl_(5(g))#, #K_c = 96.2 # at 400 K. If the initial concentrations are 0.22 mol/L of #PCl_3# and 0.42 mol/L of #Cl_2#, what are the equilibrium concentrations of all species?
  
• What happens to the equilibrium constant in a complexation reaction?
  
• For the reaction #NH_4HS_((s)) rightleftharpoons NH_(3(g)) + H_2S_((g))#, #K_c = 1.2*10^(-4)# at 491K. What concentration of #NH_3# will be present at equilibrium if a sample of #NH_4HS# is placed in a vessel at 491K?
  
• CO (g) + ½ O2(g) ↔ CO2(g In an experiment, 4.95 mol of CO2, 0.050 mol of CO and 0.050 mol of O2 are placed in a 5.0 L reaction vessel at 1400 °K. If Kc = 1.05 x 10-5, what will the equilibrium concentrations be for each reactant and product?
  
• 16. A 4.37 g sample of a certain diatomic gas occupies a volume of 3.00-L at 1.00 atm and a temperature of 45°C. Identify the gas. Anyone please help?
  
• A 5.00–liter sample of nitrogen gas at 27°C and 320 mm Hg is heated until it occupies a volume of 15.0 liters. If the pressure remains unchanged, the final temperature of the gas is?
  
• Calculate the amount of heat that must be released to convert 20.0 g of mercury vapor at #387^@"C"# to liquid mercury at #307^@"C"# (in kJ)?
  
• Calculate the amount of heat (in kJ) that must be absorbed to convert 108 g of ice at #0^@"C"# to water at #70^@"C"#?
  
• Assume 12,500 J of energy is added to 2.0 moles of #H_2O# as an ice sample at #0^@"C"#. The molar heat of fusion is 6.02 kJ/mol. The specific heat of liquid water is 4.184 J/g K. The remaining sample consists of?
  
• The liquefied hydrogen halides have the normal boiling points given above. The relatively high boiling point of HF can be correctly explained by which of the following?
  
• If p and n are integers such that p>n>0 and p^2-n^2=12, which of the following can be the value of p - n? I. 1 II. 2 III. 4
  
• If j , k , and n are consecutive integers such that 0 < j < k < n and the units (ones) digit of the product jn is 9, what is the units digit of k ?
  
• Why doesn't helium have a third ionization energy?
  
• Is virus a living or non-living thing?
  
• How do you find the vertex for the function #f(x)=1/x#?
  
• Will a double displacement reaction occur between copper (II) sulfate and hydrochloric acid? Why or why not?
  
• To What Extent Do Ethics Play A Role of Science?
  
• C3H7OH is propanol. Suppose you have 85.9 g sample of propanol. How many carbon atoms are in the sample?
  
• Why are the tangents for 90 and 270 degrees undefined?
  
• A compound that contains 6.44g of boron and 1.80g of hydrogen has a molar mass of approximately 28g/mol. What is its molecular formula?
  
• The height, h, in metres of the tide in a given location on a given day at t hours after midnight can be modelled using the sinusoidal function h(t) = 5sin(30(t-5))+7 What time is the high tide?What time is the low tide?
  
• Determine x so that x, 1/2x+7, and 3x-1 are the first three terms of an arithmethic sequence?
  
• Determine an equation of a cosine function, given the following info: Amplitude: 3 Period: 120 V.Shift: 6 The function has a maximum at 15?
  
• The sum of the first two terms of an arimethic sequence is 15 and the sum of the next two terms is 43. Write the first 4 terms of the sequence?
  
• Determine the sum of the series 1, 1/2, 1/4, 1/8 .......... t(14)?
  
• A new golf course has 480 lifetime members 3 weeks after it opens and 1005 lifetime members 6 weeks after it opens. Assume the membership increase is arimethic, what is the general term that represents the sequence for this situation?
  
• Determine the equation of the parabola with vertex (-3,6) and that passes through (2,-9)?
  
• If #F=(GMm)/d^2#, then #d=#?
  
• A truck travels at an average speed of 45 km/h over a distance of 105 km. It then travels another 85 km at a higher average speed. His overall average speed for the entire trip is 55 km/h. What was his average speed for the second stage?
  
• Josh rolled a bowling ball down a lane in 2.5 s. The ball traveled at a constant acceleration of 1.8 m/s2 and was traveling at a speed of 7.6 m/s by the time it reached the pins at the end of the lane. How fast was the ball going when it left?
  
• An airplane accelerates down a runway at 3.20 m/s_2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff?
  
• Physics Help Needed?
  
• You are in the back of a pickup truck on a warm summer day and you have just finished eating an apple. The core is in your hand and you notice the truck is just passing an open dumpster 7.0 m due west of you. The truck is going 30.0 km/h due north - cont?
  
• A superhero launches himself from the top of a building with a velocity of 7.3m/s at an angle of 25 above the horizontal. If the building is 17 m high, how far will he travel horizontally before reaching the ground? What is his final velocity?
  
• Kinematics in 2D Word Problem Help?
  
• Using the law of inertia, explain this statement?
  
• Long Word Problem on Newton's Third Law. Help?
  
• Can someone help verify the answer?
  
• Can someone explain this question using a FBD?
  
• What is Education Inequality?
  
• Can anyone provide a step by step explanation?
  
• A crane lifts a 487 kg beam vertically at a constant velocity. If the crane does 5.20 x 10^4 of work on the beam find the vertical distance that it lifted the beam?
  
• Can someone help explain the reasoning behind this question?
  
• How do you determine the height for Part B of this question?
  
• Thinking Question on Latent Heat, Help?
  
• Question related to the conservation of mechanical energy?
  
• How is the speed of a wave determined for this question?
  
• Word Problem regarding The Doppler Effect?
  
• Are homeless people considered deviants? Why/Why not?
  
• Standing Waves Question?
  
• Physics Word Problem?
  
• Can anyone help explain the reasoning behind the answers?
  
• Can someone lend me a hand in explaining sig figs involving different units?
  
• Can someone explain on how they derived to the answer of 20.0L?
  
• Is this equation a function?Why/Why not?
  
• Is the answer to this question 221 J? If not, can someone explain it to me?
  
• Is anyone willing to provide comments/feedback on my essay?
  
• Can anyone explain the logic behind why we used exponantial functions to model bacteria growth?
  
• Calculate the concentration of each species at equilibrium?
  
• After the second equilibrium was reached a student added an unknown amount of HBr gas. He found that the concentration of H2 gas at equilibrium increased by 0.050 M. How much HBr gas did the student add to the system?
  
• Determine the final pH of a 0.200M triprotic phosphoric acid solution?
  
• Calculate the pH of the solution below. 30.00mL of 0.100 M #"HCl"# is mixed with 25.00 mL of 0.100 M #"NH"_3# ?
  
• The movement of a certain glacier can be modelled by d(t) = 0.01t^2 + 0.5t, where d is the distance in metres, that a stake on the glacier has moved, relative to a fixed position, t days after the first measurement was made. Question?
  
• Determine the interval whereby 6x^2 + 44x + 70 ≥ 0?
  
• Can somehow help justify if my solutions to the problem below is correct and guide me on (b)?
  
• Determine the completely factored form of #f(x) = 12x^3 - 44x^2 + 49x - 15#?
  
• Can someone explain this word problem?
  
• Word Problem on polynomial inequalities help?
  
• What is the 3D structural diagram for cycloheptane?
  
• Can anyone help name these organic compounds and draw them out as well?
  
• Can anyone help name the following hydrocarbon derivatives?
  
• Can anyone help out in solving these 4 questions under Question 4?
  
• Can someone explain the reasoning behind dividing the interest rate of 0.08% over 4 here? Like, what does it mean in real life if I were to multiply instead of dividing?
  
• Can anyone help prove this trigonometric identity?
  
• Anyone understands how to solve this question?
  
• Can anyone help prove this trigonometric identity?
  
• Can anyone include a diagram as part of the explanation here?
  
• How to prove this trigonometric identity?
  
• Can anyone demonstrate the workings to obtain the solution?
  
• Does anyone understand what this question is asking?
  
• Can anyone explain this problem with an aid of a diagram?
  
• Can anyone help confirm the answer I have to these 3 questions?
  
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