Why are metals and alloys used in so many materials? Why does graphite have a high melting point? Why is glass an amorphous solid? Why do electric field lines point away from positive charges? Why do metals feel colder than plastic in an air-conditioned room even though they should be at...
Why should a melting point sample be finely powdered? Explain very briefly why the boiling point of H2O is higher than that of H2. Why can't benzene dissolve sodium chloride? Explain the trend in melting point of metals across period 3 elements. ...
Explain in details why the melting point sample should be funky powdered and packed tightly into the capillary tube. Why do ionic compounds conduct electricity in an aqueous solution or when molten, but do not conduct electricity when in the solid-state?
Metals in a liquid (slurry) form are filtered and dried before being smelted or roasted. Smelting is a high-temperature process that extracts the molten metal from the slag (unwanted molten waste). Roasting is also a high-temperature process. It produces metal oxide particles. The metals are ...
Until economics, legislation or demand catches up, one idea is to save the metals, trapped in their devices, for the future. “Some people say we should landfill it all and wait for a better technology,” says Rademaker. “That’s the idea of urban mining. If you have the space for ...
The zinc molten, which is cooled to 824℉, can be further purified by cooling it in the chamber for several hours. During this refining stage, iron and other impurities sink to the bottom, while pure zinc remains at the top. Alloying Most zinc is alloyed with other metals. To make alloy...
The main focus of research in recent decades has been on biofuels, which can be produced from several sources. The production of biofuels is usually energy more intensive than production of fossil fuels, but their usage can contribute to emission reduction in the Transport sector. In recent ...
Now we come down to Earth. Every time a volcano erupts, we're reminded that we're merely passengers on a floating crust, which drifts around on a liquid core of molten rock and metals many miles below. But this liquid core is essential to life. Because of its metallic elements being in...
Normally an electrical plating process would be used, but YKK uses the base color of the material itself, without electrical plating, in their finished products. No heavy metals are used, and they save an enormous amount of electricity. This obviously hasn’t reduced the number of colors (80...
Even among O’Neillians who agree that the moon’s resources should be tapped, there is no consensus on how to do it. Even the most basic question—what should be extracted and sold—has changed over time. The moon has many attractive commodities, including metals for construction, silicon...