Gaseous helium atoms must be cooled to 4.2 K before He liquefies. For elements, this is the lowest liquefaction temperature. Based upon our understanding of gas behavior, explain what is unique about He causing it to liquefy at such a low temperature.

Q: Drew the atomic structure of gallium arsenide (GaAs).

A: GaAs is of the zincblende structure that has FCC symmetry . Each galium atom is bordered by arsenic…

Q: The normal boiling point temperatures of the Noble gases are tabulated below. Noble gas…

A:

Q: Explain how crystalline and amorphous solids are organized. Give some examples emphasizing the…

A: Matter occurs in three states - Solid, Liquid and Gas. Solid occupies space, have fixed volume and…

Q: Indicate the type of crystalline structure each of the following would form upon crystallization.…

A: The objective of the question is to write the crystalline structure of the given chemical.

Q: calculate density in g cm^-3 - molar mass is 200.5 g.mol - simple cubic lattice - radius of 185 pm

A: Given, The radius of atoms, (r)=185 pm. The edge length of the unit cell, (a)=2r=370 pm=3.70×10-8…

Q: Two different pure solids are melted, and one exhibits a melting point of 138 oC, while the other…

A: Compounds are formed from two or more elements. Compounds are characterized by different chemical…

Q: Explain how the conductivity of electricity and the high boiling points of metals are explained by…

A: The conductivity of electricity and the high boiling points of metals are explained by a metallic…

Q: silica(a common stationary phase) has Si-OH(silanol) groups on the surface which readily form…

A: Silica has a greater affinity for polar compounds.Explanation:Silica has a greater affinity for…

Q: How does temperature influence the surface tension and viscosity of ionic liquids and their…

A: Surface tension arises due to the cohesive nature of the of molecules in a solution or it is defined…

Q: Ammonia can be liquefied by compression at room temperature; oxygen cannot be liquefied under these…

A: The critical temperature of a substance is defined as the maximum temperature at which the substance…

Q: Explain using words and pictures why substances that have high vapor pressures at room temperature…

A: Vapour pressure is the escaping tendency of molecules . Higher the vapour pressure higher is the…

Q: Provide the following physical properties of Water: Heat fusion Surface tension Dielectric constant

A: To give: Physical properties of water.

Q: All alkali metals possess a body centered crystal structure. This means that they contain a. 4…

A: Note - Since you have asked multiple question, we will solve the first question for you. If you…

Q: Does sodium hydroxide have higher conductivity or ammonia?

A:

Q: Why does spilled gasoline evaporate more rapidly on a hot day than on a cold day?

A: The reason behind given fact is explained below, Liquid state: A physical state of matter where…

Q: Differentiate between an amorphous and crystalline solid

A:

Q: Cite some possible applications of determining the melting point of a substance. Explain briefly

A: In addition to that, melting point is often used to predict the partition behavior of a chemical…

Q: Single crystals are translucent but most crystalline solids appear white.3 Explain this observation.

A: Given, Crystalline solids : It is solid material which has highly ordered arrangements microscopic…

Q: Which statement is true? Statement 1: Sublimation refers to the phase transition in which matter…

A: Given statements are : Statement 1: Sublimation refers to the phase transition in which matter…

Q: In terms of shape, how does water appear on a molecular level at lower temperature? O tridimensional…

A: A decrease in temperature caused the water molecules to lose energy and slow down, which results in…

Q: Provide the following physical properties of Water: Melting point Boiling point Heat of…

A: To give: Physical properties of water.

Q: Why do salt crystals have a cubical shape?

A:

Q: Describe the properties of a liquid, including vapor pressure, viscosity, and surface tension

A: To find: The description about the properties of a liquid including viscosity, vapor pressure and…

Q: >Explain why the viscosity of liquid sulfur increases with increasing temperature initially, but…

A: The liquid S viscosity increases as temperature increases initially but on further temperature it…

Q: rrange the following in order of ease of liquefaction; CCl4, CH4, CF4.  Explain your ranking.

A: Liquification depends only on the strength of intermolecular attractive forces. Greater the…

Q: What is the relationship between density and crystal structure?

A: To find: Relationship between density and crystal structure.

Q: Which of the following has the highest boiling point? O 0.20 m Na3PO4 O 0.45 m CH3CH2OH O 0.15 m…

A: The elevation in boiling point of any solution is given by  elevation in boiling point = i X Kb X m…

Q: An unidentified elemental solid has a density of 5.36 g/cm3. 5.36 g/cm3. As a solid this element…

A: D= zM÷(a)3NA Molar mass= 580g/mol This element dies not exist

Q: If 20.15% of the atoms in a sample of tin are replaced by copper atoms without any change to the…

A:

Q: Under room conditions, fluorine and chlorine are gases,bromine is a liquid, and iodine is a solid.…

A: Intermolecular forces refer to the type of interactions which are present in between atoms or…

Q: 4. List types of crystal imperfections, give their dimensionality and examples.

A: The crystalline nature of the substances acquires their constituent particles/atoms in the proper…

Q: Decide what kind of crystalline solid each element or compound in the table forms, and what kind of…

A: We have been given three compounds.We have been asked to identify kind of crystalline solid in given…

Q: Distinguish between isotropic and anisotropic substances.To which category do liquid crystals…

A: Liquid crystals are the substances that have a crystalline structure and packed with a high degree…

Q: types of forces that are likely to hold H2O its solid phase together uopn condensation/deposition

A: