(Question)
Answer the following question given this paragraph: Coal is a solid hydrocarbon. Coal is useful as a fuel, especially for generating electricity. Coal is relatively inexpensive and abundant. Developing nations, like China, rely heavily on coal. Around the world, coal is the largest source of energy for electricity. Q: What type of hydrocarbon is coal? Choices: - mineral - gas - liqued - solid A:
(Answer)
solid

(Question)
Answer the following question given this paragraph: There are a number of different ways to measure the strength of a given crystal lattice. One way would be to measure the amount of energy needed to completely pull apart an ionic substance into isolated ions. This value, known as the lattice energy , cannot be measured directly, but it can be calculated based on measured energy changes for other more feasible processes. The lattice energy of an ionic solid provides us with one way to measure the relative strength of the ionic bonds in that compound. Table below shows the lattice energies for various ionic substances:. Q: Lattice energy cannot be measured directly. what is its calculation based on? Choices: - chemical reactions - change in temperature - microscopic inspection - measured energy changes A:
(Answer)
measured energy changes

(Question)
Answer the following question given this paragraph: Q: What makes the realized niche of chthamalus much smaller than its fundamental niche? Choices: - instantaneous competition - asexual competition - microscopic competition - interspecific competition A:
(Answer)
interspecific competition