Thursday, October 2, 2014

Voting has ended Article Search All AD trigonometric Zhongshannvgao Gao Zhan plan Record density

Gao Zhan natural science teaching resource platform First, density because zinc chloride aqueous density solution is acidic, its pH value of about 4, so no one yuan coins in zinc chloride aqueous solution containing the major species: Zn (s), Zn 2 + (aq), Cl - (aq), H 2 O (l), Cu (s) and H + (aq).
Zn (s) Zn 2+ (aq) + 2e - E ox o = 0.76 V [1] 2Cl - (aq) Cl 2 (g) + 2e - E ox o = -1.36 V [2] 2H 2 O (l) O 2 (g) + 4H + (aq) + 4e - E ox o = -1.23 V [3] Cu (s) Cu 2+ (aq) + 2e - E ox o = -0.34 V [ 4] Cu (s) Cu + (aq) + e - E ox o = -0.52 V [5]
Zn (s) Zn 2+ (aq) + 2e - E ox o = 0.76 V [1] 2H + (aq) + 2e - H 2 (g) E re o = 0.00 V [6] ---- ---------------------- Zn (s) + 2H + (aq) Zn 2+ (aq) + H 2 (g) E o = 0.76 V [9]
Zn (s) (from zinc powder) Zn 2+ (aq) + 2e - E ox o = 0.76 V [1] Zn 2+ (aq) (the reaction product from the zinc) + 2e - Zn (s) E re o = -0.76 V [7] ----------------------------- Zn (s) (from zinc powder) Zn ( s) (plated on one yuan coins) density E o = 0.00 V [10]
This anti-heat necessary to make physical changes zinc and copper metal melted and mixed together, forming a brass (brass). Brass is an alloy of copper and zinc, so named because of the color yellow. The copper content of 62% to 68% of the brass having density a melting point of 934 ~ 967 . Brass mechanical properties and wear resistance are very good, can be used in the manufacture density of precision instruments, ship parts. Different zinc content, there will be a different color, such as the zinc content of 18% -20% will be reddish yellow, while the zinc content of 20% -30% will be brownish yellow. Prince density of metal (Prince's metal) or Prince Rupert metal (Prince density Rupert's metal) is a type of brass containing 75% copper and 25% zinc, its beautiful golden color, is used as imitation gold. So, if you want to make one dollar coin looks like gold, the ratio of metal alloy coins surface must be larger.
Figure five silver coins gradually density transformed into golden coins
The copper alloy 4 Common density What? In this experiment the "gold" is what kind of alloy? There will be differences in the proportion of different colors on it?
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