Answer the following question given this paragraph: Unsaturated hydrocarbons called aromatic hydrocarbons are cyclic hydrocarbons that have double bonds. These compounds have six carbon atoms in a ring with alternating single and double bonds. The smallest aromatic hydrocarbon is benzene, which has just one ring. Its structural formula is shown in the Figure below . Larger aromatic hydrocarbons consist of two or more rings, which are joined together by bonds between their carbon atoms. The name of aromatic hydrocarbons comes from their strong aroma, or scent. That's why they are used in air fresheners and mothballs. You can learn more about these interesting hydrocarbons at this URL:. Q: What is the smallest aromatic hydrocarbon? Choices: - furan - sulfide - phosphate - benzene A:
benzene
(Question)
Answer the following question given this paragraph: Rising air currents carry water vapor into the atmosphere. As the water vapor rises in the atmosphere, it cools and condenses. Condensation is the process in which water vapor changes to tiny droplets of liquid water. The water droplets may form clouds. If the droplets get big enough, they fall as precipitation. Q: Clouds are formed from what? Choices: - ice crystals - snow flakes - dust particles - water droplets A:
(Answer)
water droplets
Ques: Answer the following question given this paragraph: Acids can dissolve many metals; a spilled acid can lead to contamination. Q: What corrosive substances capable of dissolving many metals can cause contamination if spilled? Choices: - salts - bases - ions - acids A:
Ans: acids
(Q).
Answer the following question given this paragraph: 8.4 Elastic Collisions in One Dimension Let us consider various types of two-object collisions. These collisions are the easiest to analyze, and they illustrate many of the physical principles involved in collisions. The conservation of momentum principle is very useful here, and it can be used whenever the net external force on a system is zero. We start with the elastic collision of two objects moving along the same linea one-dimensional problem. An elastic collision is one that also conserves internal kinetic energy. Internal kinetic energy is the sum of the kinetic energies of the objects in the system. Figure 8.6 illustrates an elastic collision in which internal kinetic energy and momentum are conserved. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elasticsome kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. One macroscopic collision that is nearly elastic is that of two steel blocks on ice. Another nearly elastic collision is that between two carts with spring bumpers on an air track. Icy surfaces and air tracks are nearly frictionless, more readily allowing nearly elastic collisions on them. Elastic Collision An elastic collision is one that conserves internal kinetic energy. Internal Kinetic Energy Internal kinetic energy is the sum of the kinetic energies of the objects in the system. Q: An elastic collision is one that conserves internal energy of what type? Choices: - thermal - seismic - potential - kinetic A:
(A).
kinetic
Ques:Answer the following question given this paragraph: Metallic Solids Metals are characterized by their ability to reflect light, called luster, their high electrical and thermal conductivity, their high heat capacity, and their malleability and ductility. Every lattice point in a pure metallic element is occupied by an atom of the same metal. The packing efficiency in metallic crystals tends to be high, so the resulting metallic solids are dense, with each atom having as many as 12 nearest neighbors. Bonding in metallic solids is quite different from the bonding in the other kinds of solids we have discussed. Because all the atoms are the same, there can be no ionic bonding, yet metals always contain too few electrons or valence orbitals to form covalent bonds with each of their neighbors. Instead, the valence electrons are delocalized throughout the crystal, providing a strong cohesive force that holds the metal atoms together. Q: What category of elements are chacterized by their ability to reflect light, called luster, their high electrical and thermal conductivity, their high heat capacity, and their malleability and ductility? Choices: - halogens - nonmetals - noble gases - metals A:

Ans:metals
Ques:Answer the following question given this paragraph: Pressure is defined as force per unit area, . Q: What is defined as force per unit area? Choices: - energy - resistance - momentum - pressure A:

Ans:
pressure