Which system has a higher level of entropy?

Which has a greater total amount of thermal energy, the human at 98°F or the Martian atmosphere at -100°F?  Why?

We have recently discovered that Mars, like Earth, experiences periods of glaciation, or ice ages.  To understand how this might impact the ability for humans to survive long-term on Mars, scientists at NASA are developing models to understand glaciation events on Mars.  What is a model and why are they useful?  

Which picture best represents a pure element?

The freezing point of water is _______ on the Celsius temperature scale.

The Chinese company also claims that they have developed a heat engine that can collect thermal energy during the Martian day and convert 100% of that thermal energy into electrical energy to be stored in batteries.  How do you respond to this claim and what Law does it refer to?

The density of bromine is 3.12 g/cm3. What is the mass of 155 mL of bromine? (Hint: density = mass/volume)

With reference to Question 20, which Laws of Thermodynamics does each part of this statement refer to?

A sample of metal has a mass of 0.0049 g. What is this mass in milligrams? (Hint: 1 g = 1000 mg)

Within an energy level, the _______ orbital is the lowest in energy.