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Blocks of concrete 10m long are placed end to end with no space in between them to allow for expansion. If the blocks were placed at a temperature of 20oC, what will be the force of compression when the temperature reaches 40oC? The contact area between the block is 0.20m2. Will fracture occure?
A list of compiled anhydrous masses for Na2CO3, CaSO4, and MgSO4 and I have to find the molar ratio of these anhydrous masses. The compiled list is from every section of chemistry, Different masses for different dates for each of the anhydrates
The compounds listed above were heated in ethanol and sodium hydroxide for approximately 60 minutes. Then extracted with dichloromethane to get the final product.
Assume that 50.0 mL of 0.100M HCl was added to 125 mL of 0.100M Sodium Acetate. Is the resulting solution a buffer. Why or why not. Calculate the pH of the resulting solution. The Ka for acetic acid is 1.75 x 10^-5.
Calculate the molality of a 0.052 M solution of ethyl alcohol in water at 25 degree Celsius. (assume the density of the solution at such low concentration is equal to that of water at 25 degree Celsius,0.997 g/mL.)
The concentration of each gas once equilibrium is reached. The new equilibrium concentrations if the volume is suddenly halved (still at 298K)
If the water initially has a temperature of 26 0C, how many kilojoules of heat must be removed to cool and freeze the water at 0 0C?
Write the balanced net ionic equation for the reaction that occur in the following case. Ba(NO3)2 (aq) + K2SO4(q) Express your answer as a balanced net ionic equation.
A solution is made by mixing 15.0 g of NaOH and 71.0 mL of .19 M HNO3. Calculate the concentration of Na+ ion remaining in solution.
According to the Balmer-Rydberg equation, transitions from n= 5 to m= 2 result in a photons of light that give rise to a spectral line with what color
How many hydrogen bonds exist per full turn of the alpha helix? What is the rise in angstrom? Can these be different in different alpha helices? Explain.
Which of the following strong electrolytic solutions will have the highest electrical conductivity?
the specific heat of ethylene glycol is 2.42 J/g-K. How many J of heat are needed to raise the temperature of 62.0 g of ethylene glycol from 13.1 C to 40.5 C ?
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