
Interpretation: The structural or bonding aspect of graphite and carbon nanotubes that allows their use as semiconductors, whereas diamond as an electrical insulator has to be explained
Concept Introduction:
The property of a chemical element to exist in two or more different forms is called as allotropy. The different forms of an element are termed as allotropes. Some elements that exhibit allotropy are carbon, tin, sulphur, oxygen and phosphorus
The substance that has the tendency to conduct electricity is called as conductor whereas the substance that does not conduct electricity is termed as insulator. Semiconductors are substances that conduct electricity either by addition of an impurity or by the effects of temperature on it. Semiconductor’s electrically conductivity lies between conductor and insulator.
In terms of band theory, the energy separation between the valence band and
Conduction band determines whether a material is conductor, semiconductor or insulator.

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Chapter 24 Solutions
Chemistry: Atoms First
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- The reaction of solid dimethylhydrazine, (CH3)2N2H2, and liquefied dinitrogen tetroxide, N2O4, has been investigated for use as rocket fuel. The reaction produces the gases carbon dioxide (CO2), nitrogen (N2), and water vapor (H2O), which are ejected in the exhaust gases. In a controlled experiment, solid dimethylhydrazine was reacted with excess dinitrogen tetroxide, and the gases were collected in a closed balloon until a pressure of 2.50 atm and a temperature of 400.0 K were reached.(a) What are the partial pressures of CO2, N2, and H2O?(b) When the CO2 is removed by chemical reaction, what are the partial pressures of the remaining gases?arrow_forwardOne liter of chlorine gas at 1 atm and 298 K reacts completely with 1.00 L of nitrogen gas and 2.00 L of oxygen gas at the same temperature and pressure. A single gaseous product is formed, which fills a 2.00 L flask at 1.00 atm and 298 K. Use this information to determine the following characteristics of the product:(a) its empirical formula;(b) its molecular formula;(c) the most favorable Lewis formula based on formal charge arguments (the central atom is N);(d) the shape of the molecule.arrow_forwardHow does the square root mean square velocity of gas molecules vary with temperature? Illustrate this relationship by plotting the square root mean square velocity of N2 molecules as a function of temperature from T=100 K to T=300 K.arrow_forward
- Draw product B, indicating what type of reaction occurs. F3C CF3 NH2 Me O .N. + B OMearrow_forwardBenzimidazole E. State its formula. sState the differences in the formula with other benzimidazoles.arrow_forwardDraw product A, indicating what type of reaction occurs. F3C CN CF3 K2CO3, DMSO, H₂O2 Aarrow_forward
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