Answer the following question given this paragraph: Q: The burning of what type of fuels is a major source of sulfur oxides and nitrogen oxides? Choices: - biofuels - renewable - synthetic - fossil A:
fossil
(Question)
Answer the following question given this paragraph: Figure 29.17 shows a comet with two prominent tails. What most people do not know about the tails is that they always point away from the Sun rather than trailing behind the comet (like the tail of Bo Peep's sheep). Comet tails are composed of gases and dust evaporated from the body of the comet and ionized gas. The dust particles recoil away from the Sun when photons scatter from them. Evidently, photons carry momentum in the direction of their motion (away from the Sun), and some of this momentum is transferred to dust particles in collisions. Gas atoms and molecules in the blue tail are most affected by other particles of radiation, such as protons and electrons emanating from the Sun, rather than by the momentum of photons. Q: Why do comet tails always point away from the sun instead of trailing behind the comet? Choices: - dust particles attract - dust particles evaporate - dust particles liquify - dust particles recoil A:
(Answer)
dust particles recoil
Ques: Answer the following question given this paragraph: Isotopes have the same number of protons and electrons, but a different number of neutrons. Q: Isotopes have the same number of protons and electrons, but a different number of what? Choices: - reactions - impurities - atoms - neutrons A:
Ans: neutrons
(Q).
Answer the following question given this paragraph: Valence bond theory describes the benzene molecule and other planar aromatic hydrocarbon molecules as hexagonal rings of sp2-hybridized carbon atoms with the unhybridized p orbital of each carbon atom perpendicular to the plane of the ring. Three valence electrons in the sp2 hybrid orbitals of each carbon atom and the valence electron of each hydrogen atom form the framework of bonds in the benzene molecule. The fourth valence electron of each carbon atom is shared with an adjacent carbon atom in their unhybridized p orbitals to yield the bonds. Benzene does not, however, exhibit the characteristics typical of an alkene. Each of the six bonds between its carbon atoms is equivalent and exhibits properties that are intermediate between those of a CC single bond and a C = C double bond. To represent this unique bonding, structural formulas for benzene and its derivatives are typically drawn with single bonds between the carbon atoms and a circle within the ring as shown in Figure 20.11. Q: Which theory describes the benzene molecule and other planar aromatic hydrocarbon molecules as hexagonal rings of sp2-hybridized carbon atoms with the unhybridized p orbital of each carbon atom perpendicular to the plane of the ring? Choices: - hybrid orbital theory - covalent bond theory - molecular orbital theory - valence bond theory A:
(A).
valence bond theory
Ques:Answer the following question given this paragraph: Cellular respiration occurs in the mitochondria. Figure 20.13 "Respiration" shows the mitochondrion's two membranes: outer andinner. The inner membrane is extensively folded into a series of internal ridges calledcristae. Thus there are two compartments in mitochondria: the intermembrane space, which lies between the membranes, and the matrix, which lies inside the inner membrane. Q: What part of the cell does cellular respiration occur? Choices: - glucose - proton - nuclei - mitochondria A:

Ans:mitochondria
Ques: Answer the following question given this paragraph: A lake is an example of a freshwater biome. Water in a lake generally forms three different zones based on water depth and distance from shore. Q: A lake is an example of what type of biome? Choices: - natural biome - wet biome - organic biome - freshwater biome A:
Ans:
freshwater biome