CCT in Term 2
Dear all,
Hi. Holidays coming soon, which also means more work. Hehe.
First of all, holiday assignments:
1. I-learning
Please log onto the AsknLearn portal for a i-learning on Reactivity Series of Metals. You would have to print out a worksheet and use it for the i-learning.
2. Revision exercise on VA
I shall be giving out a revision exercise on volumetric analysis. Some of the classes would have gotten it at the start of the year. All are to complete this piece of work during the holidays.
Lastly, there will be a CCT next term (between Wk 3-5, haven't decided yet). It will be the first CLOSE BOOK test that you are doing this year. So must prepare well ok!
Topics to be covered include:
1. Periodic Table
2. Salts & Qualitative Analysis (Knowledge of acid/base chemistry assumed)
3. Redox reactions
4. Reactivity of Metals & Metal Extraction [i-learning, term 2's work]
5. Mole Concept and chemical calculations [Sec 3's work]
The paper would include 3 sections:
• 10 MCQ 10 mk
• Structured Questions 15 mk
• 1 Open-ended Question 10 mk
If you have any problems during your revision, you can share your questions on this blog using the comments function.
Enjoy your hols!
Hexagonal-shaped rocks crafted naturally by the sea (Jeju, Korea).
Hi. Holidays coming soon, which also means more work. Hehe.
First of all, holiday assignments:
1. I-learning
Please log onto the AsknLearn portal for a i-learning on Reactivity Series of Metals. You would have to print out a worksheet and use it for the i-learning.
2. Revision exercise on VA
I shall be giving out a revision exercise on volumetric analysis. Some of the classes would have gotten it at the start of the year. All are to complete this piece of work during the holidays.
Lastly, there will be a CCT next term (between Wk 3-5, haven't decided yet). It will be the first CLOSE BOOK test that you are doing this year. So must prepare well ok!
Topics to be covered include:
1. Periodic Table
2. Salts & Qualitative Analysis (Knowledge of acid/base chemistry assumed)
3. Redox reactions
4. Reactivity of Metals & Metal Extraction [i-learning, term 2's work]
5. Mole Concept and chemical calculations [Sec 3's work]
The paper would include 3 sections:
• 10 MCQ 10 mk
• Structured Questions 15 mk
• 1 Open-ended Question 10 mk
If you have any problems during your revision, you can share your questions on this blog using the comments function.
Enjoy your hols!
Hexagonal-shaped rocks crafted naturally by the sea (Jeju, Korea).
Labels: Assignment, Vacation
posted by Potassium Hydroxide | 10:38 PM
10 Comments:
The ilearning is weird....
and confusing.
It should not be... Read the story again and you should be able to figure out.
Basically, what measures a metal's reactivity?
Okay.. In specimen c it states that Grp 2 metals react vigorously with metals. Ahh.. What?
Specimen c also states that Lead reacts with acid but the textbook says that Pb does not react with acid.. so does it?
For clue 1, how are we to tell that Monstrosity/Doomish has a non-porous layer of oxide from the text in the letter itself? Can't it be a not really reactive metal like Zn?
Comparing page 2 and page 4 of the letter, it appears that either Monstrosity or Doomish was placed in acid.. Which one?
For clue 3, Evile reacts with water to form Hydrogen gas and its alkali, but isn't its alkali also its salt? Isn't evile hydroxide a salt?
on page 6, magical is spelt with an extra K.. is it intentional?
If I restrict myself to the list of elements mentioned in the specimens, the identity of Evile and Monstrosity seems is quite obvious but for sinisteria, I am not sure. The assignment says that it has oxidation states of 0,2,3. The possible elements are Zn and Fe but they both don't fit because Zn's is 0,2 and Fe's is 0,2,3,4,6 ... how?
Also, for Malady, being unreactive, it is either Cu, Ag, or Au and has oxidation states of 0,2.
Cu has 0,1,2. Ag has 0, 1. Au has −1, 1, 2, 3, 4, 5, 6, 7.
So does this mean that we have to consider other possible elements too?
For the solution in the bottle of pickled salamander tongues, can it be any acidic solution that can dissolve the Malady Oxide? Or must it be like those acids that are usually used for pickled foodstuff . like acetic acid, citric acid that kind of thing?
I am unable to find an element with oxidation states of 0, 2 and is unreactive ( below H in the reactivity series)
For Ss, I am thinking maybe Nickel but am not sure if it reacts with steam at all (since Fe already reacts so slowly, and the reaction is reversible too)
Something else that I am not sure, When Fe reacts with steam, is Tri-iron tetroxide or iron (III) oxide formed along with the H2 gas? The former I got form the txtbook, the latter I got from a website calling itself GCSE science.
Does Doomish react with water? It was not stated in the letter. I assume that it does not?
Well you see, these specimen are students' notes and hence mistakes are unavoidable... =)
Ok, Grp 2 metals react vigorously with acids. Pb being above H, reacts with acid. However the reaction would be extremely slow.
For clue 1, which is the best answer? If Monstrosity were unreactive, would it result in bubbling?
It seems Monstrosity should be the one being fished out of the acid. Just a mistake by the director... the audience won't notice =P
Is hydroxide a salt?
Mr Snide doesn't know the correct spelling of magical.
You have done a good job by researching on the elements' oxidation state. However, these probable oxidation states and actually only some are preferred oxidation states.
The pickling solution would be the common one which we use.
You would just have to suggest pausible identities for the metals based on the evidence.
When Fe reacts with steam, what is formed? Would this product react further to give Fe2O3?
Tri-iron tetroxide, what is its formula? Does it look logical with our present knowledge?
I think a alkali is a salt.. a basic salt...
Tri iron tetroxide is Fe3O4..
But it doesn't look like an ionic salt. The most likely charges for Fe and O is odd: Fe (4+) O (3-).
... I can't really find much about this Fe3O4.
When Fe reacts with steam, does it form FeO?
Fe + H2O -> H2 + FeO
then
2FeO + H2O -> Fe2O3 + H2
So 2Fe + 3H2O -> Fe2O3 + 3H2
Isit? I am guessing.
From http://www.wpbschoolhouse.btinternet
.co.uk/page03/Reactivity.htm
# When the metal is heated in steam an iron oxide (unusual formula) and hydrogen are formed. This oxide is 'technically' diiron(III)iron(II) oxide but its sometimes called 'tri-iron teroxide'.
* 3Fe(s) + 4H2O(g) ==> Fe3O4(s) + 4H2(g)
Wo.. okay. This clears things up. So Tri iron tetroxide is actually 2Fe(3+) + Fe(2+) + 4O(2-) so in the end the charges are balanced and it is an ionic compound. Is it?
Why does it react this way? And are compounds with the same element in different oxidation states common?
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