What is the shiniest metal?
Thinking about having a coin plated. It is just a tribute coin so its not worth much, just a tiny gold. I want it to be a white metal tho, since i have nothing to compare it to which is more sparkly silver, palladium, rhodium, platinum. Rhodium would be easiest because i could get it done at a jewelry store but im just not sure which is the shiniest.
How to find things you dropped underwater?
If its magnetic.. ( most jewlery isnt ..) try a magnet on a loooong pole.. If its not.. then you should go get some scuba gear and go down.. I dont recommend going by yourself if you are not experienced, but it would be a fun thing to do. 19 feet is not that deep... if you can hold your breath for a little bit.. and dont mind your ears hurting a bit.. then you can just go down by yourself
What type of metals are used in a spaceship to resist the burning rays of the sun?
Lots of different metals. Mostly, though, what you want is to carefully manage the balance between heat lost through radiation (related to the emissivity of the surface) and heat gained from the sun falling on it (related to the absorptivity of the surface).For instance, black paint has high absorptivity and high emissivity - so it gets warm when sun falls on it, but not hot (because the emissivity is high).White paint has low absorptivity and high emissivity - it gets cold in space.Shiny metal gets hot - yes the absorptivity is low (it’s a reflector), but the emissivity is even lower.Dull metal is somewhere in between - and then there’s all the various chemical conversion coatings for aluminum - iridite, clear anodize, black anodize, etc.Once you’ve chosen your structural material, you then have to worry about what surface treatment it has. Do you carefully bond a shiny metal layer so it can be warmer? Or something like silver-teflon (a=0.085, e=0.76) which helps radiate heat very effectively. Then, there are thermal blankets, which can either be silver covered with Kapton (which looks gold) or coated with carbon black. The Voyager spacecraft, which are a long way from the sun, used black blankets to keep warm.What materials are used for thermal control on DS1?
How do alkali metals react with water, and why?
Alkali metals: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs),and francium (Fr).Atoms want to be stable. 2 electrons in the outermost s-orbital is stable.Alkali metals, in Group 1 of the Periodic table, have only 1 electron in the outermost s-orbital, therefore they are very reactive. They want to give that electron away, giving them an oxidation state of +1.Because of their high reactivity, they must be stored under oil to prevent reaction with air. They are soft silvery metals, found naturally only in salts (not as the free elements).They are called alkali metals, because they react with water to form alkalies (strong bases capable of neutralizing acids) and hydrogen gas.In general: Metal + water → metal hydroxide + hydrogen gas.Example: sodium + water → sodium hydroxide (lye) + hydrogen gas.2Na + 2H2O → 2NaOH + H2
When a piece of metal mass of 36.63 g is dropped into a graduated cylinder (chemistry)?
When a piece of metal mass of 36.63 g is dropped into a graduated cylinder containing 23.84 mL of water, the water level rises to 30.68 mL. What is the density of the metal? Answer in units of g/cm3. Hopefully someone can help me with this question
What is a metal that will not rust if it is in the ocean?
Gold is just about chemically indestructible. However, there are also some other precious metals that are highly resistant to normal corrosion. (We speak of 'corrosion' as a general term. "Rust" usually refers specifically to iron and it's alloys.) Platinum and related metals... osmium, iridium, rhodium, etc., are all fairly unreactive. We have more experience with gold because it is more prevalent in history in use as coinage, jewelry, bullion, etc. There are plenty of examples of gold coins that have sat on the bottom of the ocean for hundreds of years, immersed in salt water, sea weed and slime and fish poop... only to be retrieved today and still be as shiny as the day it was first made. Not to say these metals cannot be chemically attacked. There is a particularly nasty brew, called "aqua regia"... a heated mixture of nitric and hydrochloric acids, which will dissolve even gold. But normal terrestrial conditions (moist air, salt water, mildly acidic pH levels, etc.) can do little to gold, platinum, and related metals. Silver does, slowly, tarnish (due mainly to traces of sulfur compounds). Copper, much more so. But gold, platinum, rhodium, iridium, etc. are extremely corrosion-resistant. Unfortunately (for us engineers), this is an expensive characteristic to take advantage of. Most of these metals are "sold by the ounce".
How do i know if my mess tin is aluminium or steel?
hit it against a rock or with something else. steel will sound more like a bell while Al will give you boring sounds. If you have time scratch a part of it with something (could be a rock) and expose both of them to salty water. Steel rust is redish brown while Al rust is white and you will notice that the shiny surface loses it's shiny-ness. Just for your information, Al is not too too bad to use in cooking as long as you clean it well and as it's not rusty.