Q: Nonmetal structures contain what type of bonds?   Read this paragraph and choose the correct option from the provided answers:  Structures of the Nonmetals The structures of the nonmetals differ dramatically from those of metals. Metals crystallize in closely packed arrays that do not contain molecules or covalent bonds. Nonmetal structures contain covalent bonds, and many nonmetals consist of individual molecules. The electrons in nonmetals are localized in covalent bonds, whereas in a metal, there is delocalization of the electrons throughout the solid. The noble gases are all monatomic, whereas the other nonmetal gases—hydrogen, nitrogen, oxygen, fluorine, and chlorine—normally exist as the diatomic molecules H2, N2, O2, F2, and Cl2. The other halogens are also diatomic; Br2 is a liquid and I2 exists as a solid under normal conditions. The changes in state as one moves down the halogen family offer excellent examples of the increasing strength of intermolecular London forces with increasing molecular mass and increasing polarizability. Oxygen has two allotropes: O2, dioxygen, and O3, ozone. Phosphorus has three common allotropes, commonly referred to by their colors: white, red, and black. Sulfur has several allotropes. There are also many carbon allotropes. Most people know of diamond, graphite, and charcoal, but fewer people know of the recent discovery of fullerenes, carbon nanotubes, and graphene. Descriptions of the physical properties of three nonmetals that are characteristic of molecular solids follow.   Choices:  - prevalent  - polymeric  - gravitational  - covalent   A:
covalent
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Q: What is the generation of electricity using photovoltaic cells to split water molecules called?   Read this paragraph and choose the correct option from the provided answers:  With fossil fuels becoming more expensive and less available, scientists are looking for other energy sources. Hydrogen has long been considered an ideal source, since it does not pollute when it burns. The problem has been finding ways to generate hydrogen economically. One new approach that is being studied is photoelectrolysis – the generation of electricity using photovoltaic cells to split water molecules. This technique is still in the research stage, but appears to be a very promising source of power in the future.   Choices:  - hybrid electricity  - aqua-electricity  - photovoltaic cells  - photoelectrolysis   A:
photoelectrolysis
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Q: The pulmonary circulation carries blood between what two organs?   Read this paragraph and choose the correct option from the provided answers:  The pulmonary circulation carries blood between the heart and lungs. The systemic circulation carries blood between the heart and body.   Choices:  - heart and pancreas  - kidney and heart  - lungs and kidney  - heart and lungs   A:
heart and lungs
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Q: Applying a pressure greater than the osmotic pressure of a solution will do what?   Read this paragraph and choose the correct option from the provided answers:  Figure 11.26 Applying a pressure greater than the osmotic pressure of a solution will reverse osmosis. Solvent molecules from the solution are pushed into the pure solvent.   Choices:  - ultrafiltration  - osmosis  - normal osmosis  - reverse osmosis   A:

reverse osmosis
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