Answers edited by Oliver S.

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• What is the cofficient of Cr^2+?
  
• A 12 inch​ (in diameter) pizza is cut into various sizes. What is the area of a piece that was cut with a central angle of 31 degrees​? The area of the piece of pizza is approximately ____ square inches. ​(Round to two decimal places as​ needed.)
  
• A bicycle possesses 1000 units of momentum. What would be the bicycle's momentum if its velocity is doubled?
  
• What happens to the distance between energy levels at higher energy levels?
  
• Why did Hitler want the area called the Sudetenland?
  
• If a sample of LiF is found to contain 7.73 x 10^24 Li+ ions how many grams of LiF formula units are present?
  
• How do you use the chain rule to differentiate #f(x)=sin(1/(x^2+1))#?
  
• What is the pH of a solution that is 5.0×10−2 M in H2CO3?
  
• OH- Concentration of 0.015 M HCl?
  
• What is your limiting reactant if 32 grams of CH4 reacts with 32 grams of oxygen gas?
  
• Calculate the mass of CO needed to react completely with 50.Og of Fe2 03?
  
• What electromagnetic waves are used for communication?
  
• How do alpha particles cause ionisation?
  
• How do you expand #(3x-5y)^6# using Pascal’s Triangle?
  
• Which of the given salt will have maximum pH?
  
• A 4.0 M solution of Mg(OH)2 is completely neutralized 160 mL of a 1.0 M solution of HCl. How many milliliters of magnesium hydroxide were required?
  
• On the EM Spectrum, which type of wave has the most energy?
  
• Expalain the free radical substitution of alkane?
  
• How do you find the amplitude, period and phase shift for #y=cos3(theta-pi)-4#?
  
• Calculate the amount of heat required to convert 45.0 g of water at 43.0 ∘C to steam at 100.0 ∘C.?
  
• Why is pOH important?
  
• Chemistry A/As Level question? HELP!
  
• How do you define sound intensity?
  
• What is the derivative of this function # y=sin x(e^x)#?
  
• What is # 3^(3/2)# in radical form?
  
• What it metal cation, including charge, from the compound #CuCl_2#?
  
• How do you solve #(x-3)^2=3(x-3)#?
  
• How do you find the volume of the solid generated by revolving the region bounded by the graphs of the equations #y=sqrtx#, y=0, and x=4 about the y-axis?
  
• How do you find the slope of the line passing through the points (-7,3) and (3,8)?
  
• How do velocity and acceleration differ?
  
• Compare and contrast isotopes and atoms ?
  
• How to do this question?
  
• How do you multiply #(7z + 8x ) ( 7z - 8x )#?
  
• The specific heat of water is 4.184 J/g times celsius degree. How much heat is required to raise the temperature of 5.0g of water by 3.0 C degrees?
  
• If 5,100 Joules of heat are released when a sample of water freezes,what is the mass of the water?
  
• The square of Mark's age 3 years ago is 6 times the age he will be in 9 years. What is his age now?
  
• How do you find the antiderivative of #f(x)=8x^3+5x^2-9x+3#?
  
• Oxalic acid is diprotic. What volume of 0.100M KOH is required to neutralize 25ml of 0.333M oxalic acid?
  
• When bonds form, energy does what?
  
• Why is the change in Gibbs energy negative?
  
• How do you calculate the energy change of reaction for the following reaction?
  
• Chem Help????
  
• What’s the final temperature in Kelvin of 1.5 gallons of water, with an initial temperature of 50 Fahrenheit, if you add 432 kJ to the water?
  
• A collection of 22 laptops includes 6 defective laptops. If a sample of 3 laptops is randomly chosen from the collection, what is the probability that at least one laptop in the sample will be defective?
  
• What are the simple units that make up proteins?
  
• How many molecules are in 30 liters of methane #CH_4# at STP?
  
• The acid dissociation constant of #"H"_2"S"# and #"HS"^-# are #10^-7# and #10^-13# respectively. The pH of 0.1 M aqueous solution of #"H"_2"S"# will be?
  
• Which chemical properties make a substance hydrophilic?
  
• If you have 16.8 L of gas at 1.0 atm, what is the new pressure if the volume is reduced to 15.0 L?
  
• How many stable isotopes does oxygen have?
  
• What would be the kinetic energy?
  
• What is the best way to study for an Algebra test?
  
• Can forces be combined?
  
• How do covalent bonds form?
  
• Why are some molecules hydrophobic?
  
• The value of an early American coin increases in value at the rate of 6.5% annually. If the purchase price of the coin this year is $1,950, what is its value to the nearest dollar in 15 years?
  
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