What do you call the bonding that occurs in inert gases and other elements with
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What do you call the bonding that occurs in inert gases and other elements with full shells, primarily due to attraction between dipole structures? a) Ionic b) Metallic c) Covalent d) van der Waals If the heat of a solution is negative, heat is given off when the solute dissolves in the solvent. What type of reaction is this? a) Exothermic b)Ideal c) Endothermic. d) Efflorescent What do you call materials that do not conduct electric current? a) Conductor d) Intrinsic material What element is known as the lightest a) Aluminum b) Manganese d) Lithium 54) Which of the following is energy removal being applied? a) Evaporation of water b) Changing water to steam c) Changing water to ice d) All of these Halogens falls under what group in the periodic table? a) Group VIA b) Group VA c) Group IVA d) Group VIIA Which of the following is added to the drinking water distribution system for disinfection? a) Soda ash d) Chlorine c) Lime D) Iodine What refers to the number of gram equivalent weights of solute per liter of solution? a) Molality b) Normality c) Molarity d) Formality Is the attraction between like molecules. a) Absorption b) Diffusion c) Adhesion d) Cohesion What do you call a substance that cannot be decomposed any further by a chemical reaction? a) Ion b) Element c) Molecule d) Atom One of the following is the standard pressure and temperature. Which one? a) 0 degree C and one atmosphere pressure b) 0 degree C and zero pressure c) 0 degree F and one atmosphere d) 32 degree F and zero pressure Which of the following is the strongest type of bonds? a) Van de Waals b) Metallic c) Covalent d) ionic Sublimation is a direct change from: a) Solid to liquid phase b) Solid to gaseous phase c) Liquid to gaseous phase d) Gaseous to liquid phase What do you call hydrocarbons containing carbon to carbon dioxide bonds? a) Alkanes b) Alkenes c) Alkynes d) None of these How are materials containing atoms with less than four valence electrons classified? a) An insulator b) A semi-conductor c) A conductor d) A compound. Which of the following has the characteristics of both metals and non-metals? a) Conductors B) Insulators C) Metalloids d) Meteor.Explanation / Answer
50. van der waals
Noble gases are not diatomic and do not possess a dipole. therefore, the only thing holding noble gases together are van der waals forces. these intermolecular forces come about due to the instantaneous dipole formation of the noble gas atoms. These forces are not strong.
51. Exothermic
Solute-solute attractions must be broken (consumes energy, endotherm), solvent-solvent attractions must be broken (also endotherm), and finally solute-solvent attractions form. This results in a lower energy state and is exotherm.
52.Insulators
Materials with low electron mobility ie,few or no free electrons are called insulators.Metals have atoms arranged themselves in such a way that there is free electons. These electrons carry charge. But in Insulators they do not have so cannot carry current.
53. Lithium
The lightest or least dense metal is lithium, which has a density of 0.534 g/cm3.
54. All of these.
Each phase change is accompanied by a change in the energy of the system. Whenever a phase change involves going to a less ordered state, energy must be supplied to overcome intermolecular forces. therefore energy is required to melt a solid. The attractive forces that hold particles in fixed positions in the solid must be overcome to form the liquid. Likewise, vaporization requires energy. The attractive forces that hold particles close to each other in the liquid must be overcome to form the gas. Sublimation also requires energy. As the strengths of the intermolecular forces increase, the amounts of energy required to cause a phase change also increase.
55. group V11A
The halogens are located on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
56.Chlorine
Chlorine readily combines with chemicals dissolved in water, microorganisms, small animals, plant material, tastes, odors, and colors. This property of chlorine is used for water treatment. It is important to add sufficient chlorine to the water to meet the chlorine demand and provide residual disinfection.
57. Normality
Normality is a way of expressing the concentration of a solution. The normality of a solution is the concentration expressed as the number of equivalent weights (equivalents) of solute per liter of solution.
58.Cohesion
Cohesion or cohesive force is the action or property of like molecules sticking together.
59. Atom
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. Atom can neither be created nor destroy but change from one form to other.
60.
61.covalent bonds
Covalent and ionic bonds are strongest bond. But still covalent bond is stronger than ionic. Covalent bonds are much stronger because the covalent bond is formed by the sharing of electrons. The electrons from two different atoms share the orbital. This means that both electrons from the two different atoms now belong to both atoms. This binds the two atoms together.
Ionic bonds the electrons are not shared. One of the atoms with a much higher electron negativity basically takes the electron from the atom with the lower electron negativity. This leaves each atom as an ion. One atom becomes a negative ion, the other atom becomes a positive ion. The attraction between the two ions holds the atoms together but is easily broken.
62. solid to gaseous phase
Sublimation is direct change from solid to gaseous phase.
63.None of These
an alkane is an acyclic saturated hydrocarbon alkene is an unsaturated hydrocarbon that contains at least one carbon–carbon double bond and an alkyne is unsaturated hydrocarbon containing at least one carbon—carbon triple bond.
64. metalloid
A metalloid has properties in between those of metal and non metals or that has a mixture of them.
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