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We need 28.18 mL of 0.2437 M HCl solution to completely titrate 25.00 mL of Ba(OH)2 solution of unknown concentration.  What is the molarity of the barium hydroxide solution? (Hint: First, write a balanced equation for the reaction.)

What phase transition is occurring between points B and C on the cooling curve?

Calculate the amount of heat energy required to evaporate 55.0 g of water at 100.0°C. (molar heat of vaporization of liquid water = 4.07 × 10^4 J/mol)

A solid substance has a very low melting point, is soft, and does not conduct heat or electricity. This substance is probably a(n) ________ solid.

What phase transition is occurring between points D and E on the heating curve?

What is the change in freezing point for a 1.5 m solution of sucrose in water? (Kf=-1.86C/m)

Calculate the amount of heat energy, in units of kilojoules, required to melt 75.0 g of ice at 0.0°C. (molar heat of fusion of ice = 6.01 × 10^3 J/mol)

What phase transition is occurring between points B and C on the heating curve?

As plaque biofilm matures, it becomes more pathogenic. Some local factors can allow plaque biofilm to mature and increase in pathogenicity.

Also known as “T-stoff”, this oxidizer was widely used in Germany during WW2. It was used to power the Me-163A “Komet”.