What advantage doesPortland concrete have for building compared to the construction methods that predated the development of concrete?

Q: In the heating of most metal alloys, melting begins at a certain temperature and concludes at a…

A: The solidus is the highest temperature at which an alloy is solid – where melting begins.The…

Q: Cadmium selenide (CdSe) is used as a semiconductor quantum dot and is an example of nanotechnology…

A: A theranostic agent is the one which diagnosis and also delivers therapy/drug. Quantum dots have…

Q: What are the Silicate Ceramics? Give some examples? What are the uses of Silicate Ceramics?

A: Silicates are materials composed generally of silicon and oxygen. They were the first ceramics…

Q: Quien a tompound Cc1₂f₂ the heat of vaherization of ccb₂f₂ is 289 ulg give the mas masa at this…

A: Given :  Heat of vapourisation of CCl2F2 = 289 J/g  Mass of water = 200 gm  Temperature of water =…

Q: Justify that Glass is an insulating material.

A: Conducting material : The materials which conduct electricity when electricity is passed through it,…

Q: A solid crystal of NaCl is O a. soft, low melting, a poor electrical conductor. O b. soft, high…

A: Ionic solids are composed of cations and anions held together by electrostatic force of attraction.

Q: describe the follwoing? are dislocations nessesary or bad for us? additionally define 3 types of…

A: It's necessary. Dislocations play an essential role in the plastic deformations of crystalline…

Q: Carbon forms a number of allotropes, two of which are graphite and diamond. Silicon has a diamond…

A: Graphite is an allotrope of carbon which is made up of hexagonal carbon rings in which each carbon…

Q: 1. Given the chemical composition by weight to a sample of the cement as follows CaO SiOz Al203…

A: 1 Compound responsible for rate of setting is tricalcium aluminate     3CaO.Al2O3  and…

Q: How is the steel used for the manufacture of metal structures and pipes for the transfer of…

A: Production of ingots1. Molten steel is manufactured by melting iron ore and coke (a carbon-rich…

Q: How is concrete made from Portland cement?

A: Tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetra-calcium aluminoferrate are…

Q: Carbon exists as several allotropes including buckminsterfullerene and carbon nanotubes. All are…

A: The existence of an element in more than one form, having the same chemical properties but different…

Q: 58. Define the equilibrium vapor pressure of a substance. How and why does it depend on temperature?…

A:

Q: Hardenability of steel is influenced by the type and character of the quenching medium. Which of the…

A: Dear student this question is related to hardness of steel.

Q: Explain (i) The basis of similarities and differences between metallic and ionic crystals.

A: From given,  The basis of similarities and differences between metallic and ionic crystals is…

Q: Describe the mechanism by which cement hardens when water is added.

A: Cement is binder substance used in construction of buildings. It is generally gray color substance.

Q: TRUE OR FALSE: Metals at the lower position in the Ellingham diagram (ex: Aluminum Magnesium and…

A: Statement : Metals at lower position in the Ellingham diagram , are not stable and easily forms…

Q: From which category of materials would you select a material best suited for building a vessel to…

A: Iron is used to make various alloys, such as stainless steel which is manufactured by mixing iron…

Q: Chemical name of the gas evolved when hydrogen fluoride is made to react with silica.

A: Since you have posted multiple questions, the answer for first question is given below. Kindly…

Q: Write the difference between ferromagnetism and anti-ferromagnetism.

A: In magnetic substances, when the metal ions are grouped together into small region, they form…

Q: A geologist concludes that a certain layer of conglomerate rock in Florida was deposited at about…

A: Geologists study the solid, liquid, and gaseous matter that makes up the Earth and other terrestrial…

Q: for what purpose polyphosphates are used ?

A: The esters or salts of polymeric oxyanions in which phosphate groups are attached tetrahedrally and…

Q: Classify as n-type or p-type a semiconductor formed by doping (a) germanium with phosphorus, (b)…

A:

Q: Minerals that generally form from the evaporation of a water-based solution belong to which chemical…

A: Rocks which formed by evaporation of water-based solution are known as evaporites or evaporites…

Q: What Important factor transforms metamorphic and Igneous rocks to sedimentary rocks? O agents of…

A: Answer :- Option A is correct answer.  Agent of weathering transforms metamorphic and igneous rock…

Q: Compare the hybridization of Si atoms in Si(s) with thatof C atoms in graphite (see Fig. 21.26). If…

A: Both Si and C atoms has 4 valance electrons in its outer most shell and both of these form covalent…

Q: Mention the main compounds which constitute Portland cement.

A: Portland cement is a binding material in the form of a finely ground powder. It is usually gray in…

Q: 16 1) What type of solid alloys are formed when a small atom occupies the holes within the lattice…

A: Solid alloys formed when small atom occupy the hole within the lattice of the metal ...?

Q: Coal and diamond are two different forms of carbon, which is denser?

A: The arrangement of carbon in diamond atom is more tightly packed as the structure of diamond is such…

Q: Explain the following:(i) Deltas are formed when river and sea water meet.(ii) Artificial rain is…

A: A delta is formed by the settling down of sediments present in a river when its flow slows down. A…

Q: In general, the presence of an oxide film on the surface of a metal will a) Increase the rate of…

A:

Q: Pure oxygen should classified as what

A: A question about classifying pure elements, which is to be accomplished.

Q: Who invented the first successful process for the commercial production of artificial graphite, as…

A: Introduction :  Graphite is basically the allotrope of carbon. It is a black, shiny mineral that has…

Q: hy do oxides of phosphorus and sulfur have varied oxidation number?

A: The oxidation state of an element is the representation of the charge acquired by that element after…

Q: How do calcium ions in water affect the textural properties of products during cooking in water?…

A: Hardness in water is due to the presence of dissolved salts of calcium and magnesium. It is unfit…

Q: Definition of cell electrically?

A: In this question, the definition of a cell has to be provided. An electric cell is defined as a…

Q: What is the disadvantage of soda-lime glass?

A: Given: To explain the disadvantage of soda-lime glass

Q: Cadmium selenide (CdSe) is used as a semiconductor quantum dot and is an example of nanotechnology…

A: