The forces that hold CaF2 together in the solid state are:

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

Which of the following is not an attribute of a base?

Calculate the amount of heat energy required to convert 35.0 g of ice at –12.5°C to water at 24.0°C. (Cwater = 4.18 J/g°C; Cice = 2.03 J/g°C; molar heat of fusion of ice = 6.01 × 10^3 J/mol)

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)

True or False An ideal rocket propellant should maximize the molecular weight of exit gases.

Deke Slayton, Vance Brand, and Thomas Stafford were the astronaut crew selected for the Apollo-Soyuz test mission. During reentry, the RCS was not shut down which allowed which of the following to enter the cabin as they descended?

A fuel or oxidizer with this property means it is independently and spontaneously ignitable in air.

SpaceX’s Falcon 9 rocket uses which of the fuel/oxidizer combinations to power the first stage?

Which of the following is the most critical initial action to perform if someone is exposed to hydrazine?