Answers created by Al E.

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• What is the pOH of a 0.80M solution of acetic acid, HC2H3O2, with a dissociation constant for a weak acid of 1.8 x 10^-5 ?
  
• I need to prepare 100.0mL of a 0.200M acetate buffer of pH 5.00. All I am given is solid sodium acetate and 1.00M of acetic acid. What is the volume of acetic acid used and the mass of sodium acetate used?
  
• The lactate ion, C3H5O3- is a weak base. A 0.40M solution has a pH of 8.728. a. Calculate the kb of the lactate ion? b. Calculate the Ka for lactic acid, HC3H5O3?
  
• The specific heat capacity of an unknown liquid is #0.32# #"J"/("kgK")#. The density of the liquid is #0.0321# #"g/mL"#. If a chemist applies #243# #"J"# of heat to #300# #"mL"# of this liquid starting at #27.1 ^@# #C#, what is the final temperature?
  
• NaHCO3 (s) —> H2O (g) + CO2 (g) + NaCO(s) As a balanced equation?
  
• What volume of an HCl solution with a pH of 1.3 can be neutralized by one dose of milk of magnesia? If the stomach contains 220 mL of pH 1.3 solution, will all the acid be neutralized?
  
• Why sn1 and sn2 mechanism is needed ?
  
• What are the functional groups in vitamin C?
  
• What are the products? CH3CH(OH)CH(CH3)CH2CH3 [3-methyl-2pentanol]+ HCl=?
  
• At what temperature will 5.00 g of #Cl_2# exert a pressure of 900. mmHg at a volume of 750. ml?
  
• What mixtures can be separated by physical means?
  
• 1. What is the concentration of a solution of NaOH if it takes 15.98 mL of a 0.15 M solution of HClO4 to neutralize a 10.00 mL sample of the base? Report your answer in molarity. 2. How many mL of 0.2 M HI is needed to neutralize 25 mL of 0.5 M KOH?
  
• NaHSO3 is an ambient nucleophile but how?
  
• A gas originally at a temperature of 23.13C. What temperature must it be heated to triple its volume with constant pressure? Answer in celsius units
  
• The HCl in a 0.10 M HCl solution is 100% dissociated. What are the molar concentrations of HCl, H3O+, and Cl- in the solution ?
  
• Calculate the pH of the solution of #10ml# of #0.5M# # RNH_3Cl# (#K_h=10^(-9)#) + #40ml# of #0.125M# #KOH#?
  
• A buffer solution is formed when 10.0 #cm^3# of 0.230 mol #dm^-3# aqueous sodium hydroxide are added to 30.0 #cm^3# of 0.550 mol #dm^-3# aqueous propanoic acid. How do you calculate the number of moles of propanoic acid originally present?
  
• If the osmolarity of blood is 290 milliOsmolor, what value in mM is nM NaCl when KCl is 25 mM, MgCl2 is 25mM, Glucose is 100mM and Fructose is 30mM. what is the missing value of NaCl mM ?
  
• What is the relationship between Hydronium, Hydroxide, and Water?
  
• What is the correct name of the following: CH3-o-ch2-ch2-ch3?
  
• When do I use the molar mass of diatomic oxygen instead of atomic oxygen in stoichiometry problems?
  
• What volume of 0.5 M nitric acid is needed to neutralize 25 mL of 0.2 M sodium hydroxide?
  
• Determine the [H3O +] in a 0.22 M solution of HClO4. Answer in units of M.?
  
• Why is scientific notation important?
  
• How much heat is required to change 40 g of water by 25℃? (c= 4.18 J/g℃)
  
• Explain markovnikov's rule with one example?
  
• A buffer is made by dissolving #"NaClO"# and #"HClO"# in water. How do you write equations to show how this buffer neutralizes added H+ and OH-?
  
• A student mixes a 10.0 mL sample of 1.0 M NaOH with a 10.0 mL sample of 1.0 M HCl in a polystyrene container. The temperature of the solutions before mixing is was #20.0^@ C#; the final temperature is #26.0^@ C#. What is the value of #DeltaH_(rxn)#?
  
• An empty graduated cylinder weighs 45.8772 g. After 20.0 mL of a liquid is added, the cylinder and its contents weigh 77.7572 g. What is the density of the liquid in g/mL?
  
• What is the concentration of a solution with a volume of 660 mL that contains 33.4 grams of aluminum acetate (molar mass 204.1)?
  
• What is a buffer solution and how does it work?
  
• How much energy is needed to melt 25.4g of iodine? DeltaH fusion = 61.7J/g
  
• Determine the [OH−] in a 0.22 M solution of HClO4. Answer in units of M.?
  
• 50.0 mL of 0.10 M acetic acid is titrated with 10.0 mL of 0.10 M NaOH. What's the pH of the solution?
  
• How would diluting HA from 0.15 M to 0.005 M affect the pH of the solution? #K_a = 1.0 xx 10^-8#.
  
• What reaction occurs when 35.8mL of 0.00194M HClO4 are mixed with 20.0 mL of 0.00356MNaOH? (Assume volumes are additive.)?
  
• The value of ΔH° for the following reaction is -72 kJ. How many kJ of heat will be evolved when 1.0 mole HBr is formed in this reaction? H2(g) + Br2(g) → 2HBr(g)
  
• A sports-utility vehicle has an average mileage rating of 17.00 miles per gallon. How many gallons of gasoline are needed for a 395.0 -mile trip?
  
• 20 mL of 0.244 M hypochlorous acid (HClO) has been titrated with 0.150 M of sodium hydroxide. How can I find pH?
  
• How do pH and pKa relate?
  
• How does pKa affect equilibrium?
  
• Evaluate the pH of 0.05M NaCN. When the kb =10 ^-4.7?
  
• The molality of a solution of ethyl alchohol in water is 1.54 mol/kg. How many grams of alchohol is dissolved in 2.50 kg of water?
  
• Assuming ideal behavior, what is the boiling point for a solution that contains 35.7 g NaCl (58.44 g/mol) and 100.0 g H2O?
  
• How do you find the density of a fluid?
  
• The frequency of the first harmonic standing wave in a pipe that is open at both ends is 200 Hz. What is the frequency of the first harmonic in a pipe of the same length that is open at one end and closed at the other?
  
• How to convert from N.s/m^2 to N.s/cm^2 ????
  
• What is the amount of energy liberated in joules when 85 g of water cools from 45 C to 25 C.?
  
• If a projectile is shot at an angle of #(5pi)/12# and at a velocity of #1 1 m/s#, when will it reach its maximum height?
  
• Your walk to school is a half a mile. Approximately how many feet is this?
  
• What is the speed for a car that went a distance of 125 kilometers in 2 hours time?
  
• A refrigerated truck has a dimension of 12m*2m*3m. The cargo space at the refrigerated truck is to be cooled from 25(oC) to 6(oC). The heat lost by transmission is 1kJ/s and the power input of the refrigeration system is 10kW?
  
• How fast will an object with a mass of #16 kg# accelerate if a force of #88 N# is constantly applied to it?
  
• What is octet rule?
  
• Supose that you need 2 Joules to expand a spring from its natural length of 30 cm to 42 cm: A)How much work its required to expand it from 35 to 40 cm? B)How long will expand from its natural length if a force of 30N is aplied to it?
  
• A wrench with a length of #15 cm# is being used to unscrew a #3 cm# bolt. If a torque of #1 Nm# is needed to overcome the friction keeping the bolt in place, what is the minimum torque that must be applied to the wrench to unscrew the bolt?
  
• A golf ball is hit in the air with an upward velocity of 45ft from the top of a building of 50ft.(t)=16t^2+45+50 Round to the nearest tenth?
  
• How many litres of liquid CCl4 ( d=1.5 g/cc) must be measured out to contain 10^25 CCl4 molecules?
  
• A car experience a displacement of 40km in 20 min. What is the average velocity in m/s?
  
• A truck pulls boxes up an incline plane. The truck can exert a maximum force of 4,000N. If the plane's incline is #(5π)/8# and the coefficient of friction is #9/8#, what is the maximum mass that can be pulled up at one time? Thanks
  
• An object with a mass of #15 g# is dropped into #250 mL# of water at #0^@C#. If the object cools by #120 ^@C# and the water warms by #9 ^@C#, what is the specific heat of the material that the object is made of?
  
• Two objects have masses of #32 MG# and #23 MG#. How much does the gravitational potential energy between the objects change if the distance between them changes from #7 m# to #34 m#?
  
• (PHYSICS HELP!) Two cars have identical horns, each emitting a frequency of fs = 409 Hz. One of the cars is moving with a speed of......?
  
• If a projectile is shot at an angle of #(7pi)/12# and at a velocity of #21 m/s#, when will it reach its maximum height??
  
• A pipe in air at 20°C is to be designed to produce successive harmonics at 225 Hz, 275 Hz, and 325 Hz. Is the pipe open or closed? How long does the pipe need to be?
  
• If a spring has a constant of #7 (kg)/s^2#, how much work will it take to extend the spring by #22 cm #?
  
• How does friction affect angular momentum?
  
• A ball with a mass of #6 kg# moving at #8 m/s# hits a still ball with a mass of #12 kg#. If the first ball stops moving, how fast is the second ball moving?
  
• A 0.45-kg football traveling at a speed of 22 m/s is caught by an 84-kg stationary receiver. If the football comes to rest in the receiver's arms, what is the magnitude of the impulse imparted to the receiver by the ball?
  
• A paddock on level ground is 2km long and 1km wide. If a farmer walks from one corner to the opposite corner along the fences in 40 minutes, how long will it take him walks across the diagonal?
  
• A model train with a mass of #5 kg# is moving along a track at #12 (cm)/s#. If the curvature of the track changes from a radius of #16 cm# to #24 cm#, by how much must the centripetal force applied by the tracks change?
  
• Paul drove for one and a half hours at 65 mph before he realized he had forgotten his wallet. How far was he from home?
  
• Question: A 3kg block is attached to an ideal spring with a force constant k = 200N/m. The block given + + direction of magnitude u = 12 m/s. Find a. The amplitude b. The phase angle c. Write an equation for the position as a function of time?
  
• How do you calculate inelastic collisions?
  
• A rocket accelerates at a rate of #30# #m##/##s^2# for #2# minutes. What is its change in velocity?
  
• What is the linear speed and centripetal acceleration of point X?
  
• A is formed when two or more substances are so evenly mixed that you cant see the different parts?
  
• A ball with a mass of #4 kg # and velocity of #9 m/s# collides with a second ball with a mass of #7 kg# and velocity of #- 5 m/s#. If #80%# of the kinetic energy is lost, what are the final velocities of the balls?
  
• Calculate the weight of anhydrous AR sodium carbonate (Na2CO3) required to make 250.0mL of 0.0500 M solution?
  
• Determine at what temperature the reaction N2 3H2 -> 2NH3 will be product favored. delta H = -93 kJ/mol, delta S = -198 J/K mol?
  
• How many molecules are in 523g of glucose?
  
• . How many joules of energy must be absorbed to raise the temperature of 20 grams of water from 25°C to 30°C?
  
• Fe2O3 + 6H2C2O4 -----> 2Fe(C204)3^3- + 3H20 +6H What maaa of rust can be removed by 540 g of oxalic acid (H2C2O4)?
  
• How many sp2 hybridized carbon atoms in pronamide?
  
• The driver of a car traveling at 36 km/hr applies the brakes to decelerate uniformly. The car stops in 10 sec. Plot the speed-time graph for this period. Find the distance travelled by the car during this period by calculating the area under the graph?
  
• Why are loud sounds dangerous?
  
• What are the conditions for a system to be in static equilibrium?
  
• A cylinder has inner and outer radii of #2 cm# and #5 cm#, respectively, and a mass of #5 kg#. If the cylinder's frequency of counterclockwise rotation about its center changes from #12 Hz# to #9 Hz#, by how much does its angular momentum change?
  
• An object with a mass of #8 kg# is hanging from a spring with a constant of #9 (kg)/s^2#. If the spring is stretched by # 1 m#, what is the net force on the object?
  
• An object travels North at #5 m/s# for #8 s# and then travels South at #5 m/s# for # 2 s#. What are the object's average speed and velocity?
  
• Your family is moving to a new apartment. While lifting a box 1.5 m straight up to put it on a truck you exert an upward force of 200 N for 1.0 s. How much power is required to do this?
  
• Are resonance structures stereoisomers?
  
• How to balance the chemical equation C6H12 + H2O = CO2 + H2O?
  
• Which of the following alkenes will generate the most stable carbocation when it reacts with a proton?
  
• What are the possible structural isomers of the compound #C_5H_10#?
  
• Help plzz with the question below??/
  
• IUPAC name?
  
• What would be the major product of the following reaction?
  
• What is the major product of the following reaction?
  
• What is the correct IUPAC name of the following compound?
  
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