All Practicals:

[:::a:::]

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Post them here.

Apparently there are around 12. I know of 2, lol.

Be kind and post up the name of first-hand investigations that we undertook for this option topic.

Thanks!

[shanks27]

·9.6.2i Identify data, select equipment, plan and perform a first-hand investigation to compare the rate of corrosion of iron and an identified form of steel
·9.6.3i Plan and perform a first-hand investigation and gather first-hand data to identify the factors that affect the rate of an electrolysis reaction
·9.6.4ii Identify data, choose equipment, plan and perform a first-hand investigation to compare the corrosion rate, in a suitable electrolyte, of a variety of metals, including modern alloys to identify those best suited for use in marine vessels
·9.6.4.iii Plan and perform a first0hand investigation to compare the effectiveness of different protections used to coat a metal such as iron and prevent corrosion
·9.6.5i Perform a first-hand investigation to compare and describe the rate of corrosion of materials in different
-oxygen concentrations-boiled, normal
-temperatures
-salt concentrations
·9.6.6i Perform a first-hand investigation to compare and describe the rate of corrosion of metals in different acidic and neural solutions


that is all the pracs for this option they are soo much fun

[Azreil]

-Conditions which cause rusting.
-Effect of acidic/basic/conditions on corrosion.
-Methods of protection from corrosion.
-Effect of temperature, salt concentration and oxygen concentration on corrosion.
-Factors that effect the rate of electrolysis.
-Comparison between rate of corrosion of iron and a named steel.

[:::a:::]

Originally Posted by Azreil

-Conditions which cause rusting.
-Effect of acidic/basic/conditions on corrosion.
-Methods of protection from corrosion.
-Effect of temperature, salt concentration and oxygen concentration on corrosion.
-Factors that effect the rate of electrolysis.
-Comparison between rate of corrosion of iron and a named steel.

thanks man.

[SkimDawg]

Nice, I know all of them, except factors that effect the rate of electrolysis. Would that be the solution content, open to air, ect?

[:::a:::]

umm, this may be too much to ask of you guys but could someone possibly give a brief 1 or 2 sentence description on the procedure for each?

i have Jacaranda Chemistry txtbook and cannot find some of these.

[Azreil]

Originally Posted by SkimDawg

Nice, I know all of them, except factors that effect the rate of electrolysis. Would that be the solution content, open to air, ect?

Concentration of electrolyte, nature of electrolyte, nature of electrodes, size of electrode, voltage applied, etc.

gimme a sec on the descriptions.

EDIT: Okay.
Conditions under which rusting occurs: cleaned nails in each of a) test tube open to air; b) test tube with silica gel and stoppered; c) test tube in boiled water with oil covering and stoppered; d) test tube half filled with water. a) rusts slightly, d) rusts lots, b + c) don't, hence need oxygen and water.

Rate of corrosion of iron and a steel: We used iron and stainless steel. Placed strip of iron and strip of stainless steel in conditons listed in d) above. Stainless steel showed minimal, minimal rust, iron showed a lot of rust.

Rate of electrolysis: Increased concentration of electrolyte = inc rate of reaction (used NaCl dilute and concentrated)). Larger area of electrode = inc rate of reaction. Nature of electrode -> different reaction if Cu is used to graphite (Cu decomposes). Applied voltage = inc rate of reaction. Nature of electrolyte -> showed concentrated NaCl will cause different reactions to NaOH.

Protection of iron: Wrapped nail in Cu, wrapped nail in Mg, painted nail, uncovered nail. Copper showed no protective tendencies, Mg protected nail, paint protected nail, uncovered nail rusted as normal.

Temperature, oxygen and salt impact: Boiled water with oil covering, normal water, dilute NaCl solution, concentrated NaCl solution, test tube over heater, test tube in fridge. Boiled water = no rust, normal water = normal rust, dilute NaCl = marginally more, conc NaCl = lots more, test tube over heater = lots more rust, in fridge = little rust.

Acid and base: In water, in HCl, in CH3COOH, in methylamine and in NaOH (all aq). HCl = high corrosion, CH3COOH = slightly higher corrosion, methylamine = slightly lower, NaOH = much lower.

[:::a:::]

Originally Posted by Azreil

Concentration of electrolyte, nature of electrolyte, nature of electrodes, size of electrode, voltage applied, etc.

gimme a sec on the descriptions.

EDIT: Okay.
Conditions under which rusting occurs: cleaned nails in each of a) test tube open to air; b) test tube with silica gel and stoppered; c) test tube in boiled water with oil covering and stoppered; d) test tube half filled with water. a) rusts slightly, d) rusts lots, b + c) don't, hence need oxygen and water.

Rate of corrosion of iron and a steel: We used iron and stainless steel. Placed strip of iron and strip of stainless steel in conditons listed in d) above. Stainless steel showed minimal, minimal rust, iron showed a lot of rust.

Rate of electrolysis: Increased concentration of electrolyte = inc rate of reaction (used NaCl dilute and concentrated)). Larger area of electrode = inc rate of reaction. Nature of electrode -> different reaction if Cu is used to graphite (Cu decomposes). Applied voltage = inc rate of reaction. Nature of electrolyte -> showed concentrated NaCl will cause different reactions to NaOH.

*APPLAUSE*

[Azreil]

Made me think and remember them, hope it helps you too.

[:::a:::]

Originally Posted by Azreil

Concentration of electrolyte, nature of electrolyte, nature of electrodes, size of electrode, voltage applied, etc.

gimme a sec on the descriptions.

EDIT: Okay.
Conditions under which rusting occurs: cleaned nails in each of a) test tube open to air; b) test tube with silica gel and stoppered; c) test tube in boiled water with oil covering and stoppered; d) test tube half filled with water. a) rusts slightly, d) rusts lots, b + c) don't, hence need oxygen and water.

d) is exposed to air (unstoppered) though, isn't it?

also, is c) boiled and THEN stoppered or stoppered THEN boiled (maintaining no Oxygen escape) ?

[Azreil]

D is exposed to air; this is the one that proves the hypothesis of the prac: that H2O and O2 are both required for rusting to occur.

In C, the water is boiled, poured into the test tube, the nail is placed in and the oil is added to the top.

[:::a:::]

Originally Posted by Azreil

D is exposed to air; this is the one that proves the hypothesis of the prac: that H2O and O2 are both required for rusting to occur.

In C, the water is boiled, poured into the test tube, the nail is placed in and the oil is added to the top.

lifesaver. appreciate it

[:::a:::]

Originally Posted by Azreil

Concentration of electrolyte, nature of electrolyte, nature of electrodes, size of electrode, voltage applied, etc.

gimme a sec on the descriptions.

EDIT: Okay.
Conditions under which rusting occurs: cleaned nails in each of a) test tube open to air; b) test tube with silica gel and stoppered; c) test tube in boiled water with oil covering and stoppered; d) test tube half filled with water. a) rusts slightly, d) rusts lots, b + c) don't, hence need oxygen and water.

Rate of corrosion of iron and a steel: We used iron and stainless steel. Placed strip of iron and strip of stainless steel in conditons listed in d) above. Stainless steel showed minimal, minimal rust, iron showed a lot of rust.

Rate of electrolysis: Increased concentration of electrolyte = inc rate of reaction (used NaCl dilute and concentrated)). Larger area of electrode = inc rate of reaction. Nature of electrode -> different reaction if Cu is used to graphite (Cu decomposes). Applied voltage = inc rate of reaction. Nature of electrolyte -> showed concentrated NaCl will cause different reactions to NaOH.

Protection of iron: Wrapped nail in Cu, wrapped nail in Mg, painted nail, uncovered nail. Copper showed no protective tendencies, Mg protected nail, paint protected nail, uncovered nail rusted as normal.

Temperature, oxygen and salt impact: Boiled water with oil covering, normal water, dilute NaCl solution, concentrated NaCl solution, test tube over heater, test tube in fridge. Boiled water = no rust, normal water = normal rust, dilute NaCl = marginally more, conc NaCl = lots more, test tube over heater = lots more rust, in fridge = little rust.

Acid and base: In water, in HCl, in CH3COOH, in methylamine and in NaOH (all aq). HCl = high corrosion, CH3COOH = slightly higher corrosion, methylamine = slightly lower, NaOH = much lower.

For Rate of Electrolysis and (Temperature, Oxygen and Salt Concentrations) experiments, are they both just using iron nails in the results you described?

[Azreil]

Originally Posted by :::a:::

For Rate of Electrolysis and (Temperature, Oxygen and Salt Concentrations) experiments, are they both just using iron nails in the results you described?

Temp/Salt/O2 yus.

Rate of electrolysis no, it's hooking the anodes to a transformer rectifier in the electrolyte and testing the conditions.

[samwell]

Originally Posted by Azreil

Concentration of electrolyte, nature of electrolyte, nature of electrodes, size of electrode, voltage applied, etc.

gimme a sec on the descriptions.

EDIT: Okay.
Conditions under which rusting occurs: cleaned nails in each of a) test tube open to air; b) test tube with silica gel and stoppered; c) test tube in boiled water with oil covering and stoppered; d) test tube half filled with water. a) rusts slightly, d) rusts lots, b + c) don't, hence need oxygen and water.

Rate of corrosion of iron and a steel: We used iron and stainless steel. Placed strip of iron and strip of stainless steel in conditons listed in d) above. Stainless steel showed minimal, minimal rust, iron showed a lot of rust.

Rate of electrolysis: Increased concentration of electrolyte = inc rate of reaction (used NaCl dilute and concentrated)). Larger area of electrode = inc rate of reaction. Nature of electrode -> different reaction if Cu is used to graphite (Cu decomposes). Applied voltage = inc rate of reaction. Nature of electrolyte -> showed concentrated NaCl will cause different reactions to NaOH.

Protection of iron: Wrapped nail in Cu, wrapped nail in Mg, painted nail, uncovered nail. Copper showed no protective tendencies, Mg protected nail, paint protected nail, uncovered nail rusted as normal.

Temperature, oxygen and salt impact: Boiled water with oil covering, normal water, dilute NaCl solution, concentrated NaCl solution, test tube over heater, test tube in fridge. Boiled water = no rust, normal water = normal rust, dilute NaCl = marginally more, conc NaCl = lots more, test tube over heater = lots more rust, in fridge = little rust.

Acid and base: In water, in HCl, in CH3COOH, in methylamine and in NaOH (all aq). HCl = high corrosion, CH3COOH = slightly higher corrosion, methylamine = slightly lower, NaOH = much lower.

thanks this helps alot.
good luck 2moro