The ions in crystalline ionic compounds are not free to migrate under moderate electrical potential differences, because the strength of the lattice energy of a crystal imposes a significant energy barrier to motion of the ions.在电势差下,离子化合物中晶体的离子无法自由移动,是因为晶体的晶格能成为了...
So why is graphite different to diamond? The atoms inside the two materials are arranged in different ways, and this is what gives the two allotropes their completely different properties: graphite is black, dull, and relatively soft (soft and hard pencils mix graphite with other materials to ...
Explain why diamond is an electrical insulator and graphite is an electrical conductor. Explain why copper possesses a high electrical conductivity. Why do metals conductivity rate reduces with increase in temperature? Why do metallic compounds conduct electricity as a solid? How do con...
The electrode that will be plated is generally made from a cheaper metal or a nonmetal coated with a conducting material such as graphite. Either way, it has to conduct electricity or no electric current will flow and no plating will occur....
Why does stearic acid melt quickly? Explain why graphite has a lower melting point than diamond even though both are carbon compounds. Describe the bonding in metals and discuss how this explains high electrical conductivity. Explain why some ionic compounds are soluble in water. ...
strength of the lattice energy of a crystal imposes a significant energy barrier to motion of the ions.在电势差下，离子化合物中晶体的离子无法自由移动，是因为晶体的晶格能成为了阻碍了离子自由移动的能垒。说白了就是导电要带电粒子自由移动，晶体的晶格能限制了离子自由移动，所以无法导电 ...
AFMs don't suffer from this problem because, although they use still tuneling, they don't rely on a current flowing between the specimen and a probe, so we can use them to make atomic-scale images of materials such as plastics, which don't conduct electricity. Photo: A typical atomic ...
The electrical charge that ions have can be useful in all sorts of ways. Ions (as well as electrons) help to carry the electricity through batteries when you connect them into a circuit. How many atoms are there in something? If atoms are so tiny, there must be zillions and zillions of...
If your heating bills are really starting to get to you, or your home is so old and drafty that you simply can't keep heat in it for any length of time, why not shift your focus away from heating the building to keeping your own body warm? Use a moderate amount of heating each da...
"You don't generate your own electricity. Why generate your own computing?" Jeff Bezos, Amazon. What's good and bad about cloud computing? Advantages The pros of cloud computing are obvious and compelling. If your business is selling books or repairing shoes, why get involved in the nitty ...