monkey Posted January 11, 2004 Report Share Posted January 11, 2004 hello all i need a little help with my homework i thought because we have so many members maby one of the could help me1. why is zinc never found native 2.which metal is best for making sucepans zinc, iron or copper? explainsodium, magnesium, zinc, copper 3.describe the reaction of these matals with a.water b.dilute hydrocholoric acid point out how the reactions illustrate the change in reactivitythanks a lot ( this is not cheating because she said we can use the web )MONKEY B) Quote Link to comment Share on other sites More sharing options...
Guest Grim Reaper Posted January 11, 2004 Report Share Posted January 11, 2004 1) http://mineral.galleries.com/minerals/elements/zinc/zinc.htm2) copper......it has the best heat conductivity - hence copper heatsinkshope this helps Quote Link to comment Share on other sites More sharing options...
trackrat Posted January 11, 2004 Report Share Posted January 11, 2004 As above copper, this link will tell you why, go down to the words in red (heat transfer). http://www.hertzmann.com/articles/2001/copper/And try this one for zinc.http://minerals.usgs.gov/minerals/pubs/commodity/zinc/ Quote Link to comment Share on other sites More sharing options...
monkey Posted January 11, 2004 Author Report Share Posted January 11, 2004 thanks people :D Quote Link to comment Share on other sites More sharing options...
artist Posted January 11, 2004 Report Share Posted January 11, 2004 hello all i need a little help with my homework i thought because we have so many members maby one of the could help me1. why is zinc never found native 2.which metal is best for making sucepans zinc, iron or copper? explainsodium, magnesium, zinc, copper 3.describe the reaction of these matals with a.water b.dilute hydrocholoric acid point out how the reactions illustrate the change in reactivitythanks a lot ( this is not cheating because she said we can use the web )MONKEY B)Ye gods!! That brings back horrible memories!!! I would just like to say that the copper bottomed saucepans I've got take MUCU longer to heat up the contents than the all steel ones. :rolleyes: Quote Link to comment Share on other sites More sharing options...
moon Posted January 11, 2004 Report Share Posted January 11, 2004 Zinc is an elementhttp://www.webelements.com/webelements/ele...ext/Zn/key.htmlbut is found as an ore, Zinc sulfide, which needs be smelted to produce the near-pure metalhttp://minerals.usgs.gov/minerals/pubs/commodity/zinc/2) Too much zinc is bad for you. Food cooked in zinc saucepans would eventually make you ill. So would copper saucepans. Iron saucepans are the safest and most durable. Copper-based saucepans heat faster but food should not come into contact with copper.What is the health risk of too much zinc?Zinc toxicity has been seen in both acute and chronic forms. Intakes of 150 to 450 mg of zinc per day have been associated with low copper status, altered iron function, reduced immune function, and reduced levels of high-density lipoproteins (the good cholesterol) (34). One case report cited severe nausea and vomiting within 30 minutes after the person ingested four grams of zinc gluconate (570 mg elemental zinc)3 Reaction of sodium with waterSodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic. During the reaction, the sodium metal may well become so hot that it catches fire and burns with a characteristic orange colour. The reaction is slower than that of potassium (immediately below sodium in the periodic table), but faster than that of lithium (immediately above sodium in the periodic table).2Na(s) + 2H2O 2NaOH(aq) + H2(g)Blimey, what am I doing ? Here, have a butchers yerself :D http://www.gcsechemistry.com/xr4.htm Quote Link to comment Share on other sites More sharing options...
mark2 Posted January 11, 2004 Report Share Posted January 11, 2004 Did moon get a chemistry set and textbook for Xmas :blink: :blink: :D :D That brings back memories, and knowledge I thought I'd forgotten :D :D Quote Link to comment Share on other sites More sharing options...
Chris Posted January 11, 2004 Report Share Posted January 11, 2004 moon did a google :P Quote Link to comment Share on other sites More sharing options...
moon Posted January 11, 2004 Report Share Posted January 11, 2004 Too right. :D These youngsters don't know how lucky they are. When I was at school I'd have been up and down a ladder with a four kilo tome to dig that out. :D Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.