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Which has the lower concentration of hydrogen ions, vinegar at pH 3 or tomato juice at pH 4? How many times fewer hydrogen ions? Which is more acidic?
A cylindrical brass sleeve is to be shrink-fitted over a brass shaft whose diameter is 3.216 cm at 0°C. The diameter of the sleeve is 3.203 cm at 0°C. (a) To what temperature must the sleeve be heated before it will slip over the shaft
A lever uses an effort arm of 4.75 m and has a resistance arm of 21.5 cm. What is the mechanical advantage of the lever
A machine is driven by a series of gears. The first gear has 12 teeth and rotates 25.0 times per minute. How many teeth does it have
A company has been 100% equity owned but recently made changes to its capital structure.
Identify at least 3 types of computers, how they process information, and the purpose and function of key hardware components.
The average number of vacation days per year offered by different US companies is skewed to the right. A random sample of 60 companies showed the mean number of vacation days was 22, and the standard deviation was 9 days.
Calcite (CaCO3) has two types of bond. What are the two types? Demonstrate which is the stronger by calculating the degree of ionic character of each bond
Why are municipal bonds exempt from federal tax? What happends if they were not?
100 moles of water at 70 degrees celsius is brought into thermal contact with 100 moles of a monatomic gas at 20 degrees celsius, and the two substances exchange heat until they reach the same temperature. Assuming that no heat is lost to the surr..
Water at the top of Niagara Falls has a temperature of 14.0°C. If it falls a distance of 60.0 m and all of its potential energy goes into heating the water, calculate the increase in temperature of the water at the bottom of the falls.
How many milliliters of a stock solution of 10.0 M HNO_3 would you have to use to prepare 0.320 L of 0.550 M HNO_3?
A polyamide was prepared by bulk polymerization of hexamethylene diamine (9.22 g) with adipic acid (11.68 g) at 280 degrees C. Analysis of the whole reaction product showed that it contained 2.6 x 10-3 mol of carboxylic acid groups.
what mass of ammonium chloride must be added to 2.00L of 0.450M ammonia to produce a buffer with pH=9.50 Kb=1.8E-5 for ammonia
a)calculate the atom economy and reaction efficiency of your synthesis of isopentyl acetate. b) tell how the procedure of isopentyl acetate might be modifed to increase the reaction efficiency . c)Describe some green features of your syntheisi, an..
Using the Maxwell-Boltzman function, calculate the fraction of Argon gas molecules with a speed of 305 m/s at 500 K. Please show all of your work and all of your derivations.
Find either the wood oak or pine if The given density of oak = 0.9 g/cm 3 , the density of pine = 0.4g/cm 3 .
How many moles of methane occupy a volume of 2.00 l at 50.0*C and0.500 atm? (R=0.0821 atm*L/molxK)
The valence bond point of view refers to the resonance structures while the MOs refer to the resonance hybrid.
An equilibrium mixture at 225 degrees contains 0.14M NH3 and0.19 M H2 for the reaction of 3H2+N2=2. If the Kc at this temp is 1.0*102, what is the equilibrium concentration of N2
The molar heat cacpacity of silver is 25.35 J/ mol C. How much energy would it take to raise the temperature of 11.1g of silver by 14.2 C? B) Find the specific heat of silver?
We place 1.32 mol PCl5 in a 1.0L flask and allow it to reach equilibrium at a given temperature. What is the final concentration of Cl2 in the flask? PCl5 = PCl3 + Cl2 K= .47
How many grams of aluminum must be used to produce 5.00 grams of hydrogen gas?
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