Answer the following question given this paragraph: Nitrogen Oxyacids and Salts Nitrogen pentaoxide, N2O5, and NO2 react with water to form nitric acid, HNO3. Alchemists, as early as the eighth century, knew nitric acid (shown in Figure 18.50) as aqua fortis (meaning "strong water"). The acid was useful in the separation of gold from silver because it dissolves silver but not gold. Traces of nitric acid occur in the atmosphere after thunderstorms, and its salts are widely distributed in nature. There are tremendous deposits of Chile saltpeter,. Q: Alchemists, as early as the eighth century, knew nitric acid as aqua fortis, which means? Choices: - isolated water - clean water - applied water - strong water A:
strong water
Answer the following question given this paragraph: Heat Transfer to an Ectothermic Reptile. This crocodile is being warmed by the environment in three ways. Heat is radiating directly from the sun to the animal's back. Heat is also being conducted to the animal from the rocks it rests on. In addition, convection currents are carrying warm air from surrounding rocks to the animal's body. Q: What type of current carries warm air from surrounding rocks to an animal's body? Choices: - electric - ventilation - radiation - convection A:
convection
Q: Answer the following question given this paragraph: All of the organ systems of the body work together to maintain homeostasis of the organism. If homeostasis fails, death or disease may result. Q: What will be the effect to an organism if its homeostasis is not maintained? Choices: - slow aging - weight regulation - healthy mental state - death or disease A:
A: death or disease
Question: Answer the following question given this paragraph: Star clusters are small groups of stars. A star cluster is smaller than a galaxy. There are two main types, open clusters and globular clusters. Both types are held together by gravity. Q: What force holds together both types of star clusters? Choices: - weight - magnetism - inertia - gravity A:
Answer: gravity
*Question*
Answer the following question given this paragraph: Summary Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system. Changes from a more-ordered state to a less-ordered state (such as a liquid to a gas) areendothermic. Changes from a less-ordered state to a more-ordered state (such as a liquid to a solid) are always exothermic. The conversion of a solid to a liquid is called fusion (or melting). The energy required to melt 1 mol of a substance is its enthalpy of fusion (Hfus). The energy change required to vaporize 1 mol of a substance is the enthalpy of vaporization (Hvap). The direct conversion of a solid to a gas is sublimation. The amount of energy needed to sublime 1 mol of a substance is its enthalpy of sublimation (Hsub) and is the sum of the enthalpies of fusion and vaporization. Plots of the temperature of a substance versus heat added or versus heating time at a constant rate of heating are calledheating curves. Heating curves relate temperature changes to phase transitions. A superheated liquid, a liquid at a temperature and pressure at which it should be a gas, is not stable. A cooling curve is not exactly the reverse of the heating curve because many liquids do not freeze at the expected temperature. Instead, they form a supercooled liquid, a metastable liquid phase that exists below the normal melting point. Supercooled liquids usually crystallize on standing, or adding a seed crystal of the same or another substance can induce crystallization. Q: Changes from a less-ordered state to a more-ordered state (such as a liquid to a solid) are always what? Choices: - unbalanced - reactive - endothermic - exothermic A:
**Answer**
exothermic
(Q).
Answer the following question given this paragraph: The female reproductive system consists of structures that produce eggs and secrete female sex hormones. They also provide a site for fertilization and enable the development and birth of a fetus. Q: What system consists of structures that produce eggs, secrete female sex hormones, and ultimately enable birth of a fetus? Choices: - male reproductive system - female uterus system - female hormone system - female reproductive system A:
(A).
female reproductive system