Answer the following question given this paragraph: Electron Configurations and the Periodic Table As described earlier, the periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table (Figure 6.30), we also see a periodic recurrence of similar electron configurations in the outer shells of these elements. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom and are most easily lost or shared than the core electrons. Valence electrons are also the determining factor in some physical properties of the elements. Elements in any one group (or column) have the same number of valence electrons; the alkali metals lithium and sodium each have only one valence electron, the alkaline earth metals beryllium and magnesium each have two, and the halogens fluorine and chlorine each have seven valence electrons. The similarity in chemical properties among. Q: Which type of electrons plays the most important role in chemical reactions? Choices: - noncovalent - intermediate - transition - valence A:
valence
Answer the following question given this paragraph: Electricity refers to a number of phenomena associated with the presence and flow of electric charge. Electricity includes such diverse things as lightning, static electricity, the current generated by a battery as it discharges, and many other influences on our daily lives. The flow or movement of charge is an electric current (Figure 17.2). Electrons or ions may carry the charge. The elementary unit of charge is the charge of a proton, which is equal in magnitude to the charge of an electron. The SI unit of charge is the coulomb (C) and the charge of a proton is 1.602 1019 C. The presence of an electric charge generates an electric field. Electric current is the rate of flow of charge. The SI unit for electrical current is the SI base unit called the ampere (A), which is a flow rate of 1 coulomb of charge per second (1 A = 1 C/s). An electric current flows in a path, called an electric circuit. In most chemical systems, it is necessary to maintain a closed path for current to flow. The flow of charge is generated by an electrical potential difference, or potential, between two points in the circuit. Electrical potential is the ability of the electric field to do work on the charge. The SI unit of electrical potential is the volt (V). When 1 coulomb of charge moves through a potential difference of 1 volt, it gains or loses 1 joule (J) of energy. Table 17.1 summarizes some of this information about electricity. Common Electrical Terms Quantity. Q: An electric current flows in a path called what? Choices: - electric ring - electric course - fuse - electric circuit A:
electric circuit
Q: Answer the following question given this paragraph: Q: All gymnosperm species and many eudicot species undergo what? Choices: - exploitation - mutations - third growth - secondary growth A:
A: secondary growth
Question: Answer the following question given this paragraph: Q: In flowering plants, male gametophytes are in grains of what? Choices: - viruses - bacteria - nitrogen - pollen A:
Answer: pollen
*Question*
Answer the following question given this paragraph: Q: What do plants lose the most of through the stomata? Choices: - energy - chlorophyll - heat - water A:
**Answer**
water
*Question*
Answer the following question given this paragraph: Electroplating In a process called electroplating, a layer of a second metal is deposited on the metal electrode that acts as the cathode during electrolysis. Electroplating is used to enhance the appearance of metal objects and protect them from corrosion. Examples of electroplating include the chromium layer found on many bathroom fixtures or (in earlier days) on the bumpers and hubcaps of cars, as well as the thin layer of precious metal that coats silver-plated dinnerware or jewelry. In all cases, the basic concept is the same. A schematic view of an apparatus for electroplating silverware and a photograph of a commercial electroplating cell are shown in Figure 19.24 "Electroplating". Q: What is the process in which a layer of a second metal is deposited on the metal electrode that acts as the cathode during electrolysis? Choices: - casting - cold fusion - distillation - electroplating A:
**Answer**
electroplating