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Below is a mass spectrum for one of the molecules pictured above. Which molecules produced this spectrum?   

Earths’ mass and volume have been measured, and the planet’s density is about 4.5g/cm3. The rock samples collected on the surface  have densities of 3-4g/cm3 . What does this tell us about the Earth?

In which of these situations does the entropy of the universe increase?

What is the formula for molecule 1?

 What is the most likely description of the plates and plate motions  involved in forming the Gallo Mountains?

The next family member after molecule 3 will have what chemical formula?

The age provided for rock A is actually the age of what?

This family (molecules 1, 2, 3, etc) of materials is likely to have what set of properties?

Which of these statements best describes the energy transformations that take place in a car’s gasoline engine?

Semiconductors can behave like metals when you heat them up. Which of the following best explains how and why that happens?