Two balloons of the same volume are filled with helium. The kinetic energy of the helium molecules in Balloon 1 is higher than the kinetic energy of the
helium molecules in Balloon 2. What can you conclude about these balloons?
A. Balloon 1 has more helium in it than balloon 2.
B. The balloons have two different kinds of helium.
C. The temperature is lower in the Balloon 1.
D. The temperature is lower in Balloon 2.

The answer to this problem is. 67

1.75 is the weight of one medium egg

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.

The correct answer is:   [a]:   "polar easterlies move cool air to the mid-latitudes."