Chemistry questions This is a list of recently added questions about chemistry. Play chemistry quiz and see all the questions. Which of these elements is not a precious metal?Lanthanum is a chemical element with symbol La . It is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Lanthanum does not belong to precious metals. Created by: Tschukahard 53% PlatinumPlatinum13RutheniumRuthenium65SilverSilver15LanthanumLanthanum107metals riddles » The best conductor of heat (at a temperature 20 ° C and relative humidity 50%) is;Graphene has many unusual properties. It is the strongest material ever tested,efficiently conducts heat and electricity and is nearly transparent. The material , isolated, and characterized in 2004 by Andre Geim and Konstantin Novoselov at the University of Manchester. Research was informed by existing theoretical descriptions of its composition, structure, and properties This work resulted in the two winning the Nobel Prize in Physics in 2010 "for groundbreaking experiments regarding the two-dimensional material graphene." Created by: Tschukahard 50% DiamondDiamond22WaterWater41GrapheneGraphene102CelluloseCellulose37 Which of these elements is not a "rare earth metal"?Rhodium. Despite their name, rare-earth elements are – with the exception of the radioactive promethium – relatively plentiful in Earth's crust, with cerium being the 25th most abundant element at 68 parts per million, or as abundant as copper. They find application in the most dynamically developing areas of high technology industry such as: aviation, space flights, production of mobile phones (smartphones).Created by: Tschukavery hard 27% RhodiumRhodium29SamariumSamarium19ScandiumScandium36EuropiumEuropium21minerals riddles » Which of these structures is currently the thinnest, lightest and strongest artificially created material? Graphene has many unusual properties. It is the strongest material ever tested,efficiently conducts heat and electricity and is nearly transparent. The material , isolated, and characterized in 2004 by Andre Geim and Konstantin Novoselov at the University of Manchester. Research was informed by existing theoretical descriptions of its composition, structure, and properties This work resulted in the two winning the Nobel Prize in Physics in 2010 "for groundbreaking experiments regarding the two-dimensional material graphene."Created by: Tschukaaverage 62% Spectra fiberSpectra fiber46GrapheneGraphene127Silicon carbideSilicon carbide26Aramid fibersAramid fibers5minerals riddles » What is the third, after nitrogen and oxygen, component of dry air?Argon represents 0.934% of the earth's atmosphere and 1.28% of its mass. Ar-40 is an isotope that makes up the majority of the earth's argon. It is a result of decaying of another elements' unstable isotopes, mainly Potassium-40.Created by: Rafałvery hard 24% carbon dioxidecarbon dioxide1705methanemethane125ozoneozone610argonargon810technology riddles » Which petrol is more calorific - 95 or 98?Othan number 95. The octane number determines the fuel's resistance to knock combustion (detonation). Higher octane fuel increases the engine's work culture and lowers noise (which often causes the driver to feel more powerful). However, on the fuel tank 95 the car is able to travel a greater distance.Created by: Linshivery hard 25% othan number 95othan number 951076othan number 98othan number 982125they are same calorificthey are same calorific360petrol isn't calorific at allpetrol isn't calorific at all687physics riddles » What is steel made from?From iron and coal. Steel is an alloy made from iron and coal. It gets harder the more coal you use to make it.Created by: NayaNoeasy 76% From iron and coalFrom iron and coal7326from iron and tytanfrom iron and tytan883from iron and quartzfrom iron and quartz608from iron and magnesiumfrom iron and magnesium817construction riddles » What is the cryosphere effect?Decreasing the solidify temperature. Cryoskeleton effect is a decrease in the coagulation temperature of solutions, for example under the influence of salt addition. Therefore saltwater sea water freezes at lower temperatures than sweet and sprinkles in winter asphalt.Created by: Katarzyna Dąbrowskavery hard 38% Increasing the boiling temperatureIncreasing the boiling temperature926Decreasing the boiling temperatureDecreasing the boiling temperature1868Increasing the solidify temperatureIncreasing the solidify temperature2181Decreasing the solidify temperatureDecreasing the solidify temperature3111water riddles » What can we measure in Centimorgans?The The distance between chromosome positions. In genetics, a centimorgan (abbreviated cM) is a unit for measuring genetic linkage. It is defined as the distance between chromosome positions for which the expected average number of intervening chromosomal crossovers in a single generation is 0.01. It is often used to infer distance along a chromosome. However, It is not a true physical distance.Created by: Katarzyna Dąbrowskahard 52% The distance between molecules in solutionThe distance between molecules in solution613The length of chemical bondsThe length of chemical bonds682the The distance between chromosome positionsthe The distance between chromosome positions2257The length of protein structuresThe length of protein structures746genetics riddles » Who discovered the rubber vulcanization process?Charles Goodyear for many years improved the method of hardening the rubber. When he succeeded in 1839, investors were already offended by earlier failures. Charles died in misery, and Goodyear company, named in his honor, has nothing to do with him.Created by: GabrielBaranvery hard 30% Charles GoodyearCharles Goodyear3891John Boyd DunlopJohn Boyd Dunlop3186Edouard MichelinEdouard Michelin3781Giovanni Battista PirelliGiovanni Battista Pirelli1749tires riddles » Play chemistry quiz and see all the questions.