Organic chemistry is a subdiscipline within chemistry involving the scientific study of the structure, properties, and reactions of organic compounds and organic materials, i.e., matter in its various forms that contain carbon atoms.[1] Study of structure determines their structural formula. Study ...
CHEM 120 LATEST FINAL EXAM 2023- 2024 SESSION GRADED A+ ACCURATE EXAM WITH SOLUTIONS
CHEM 120/103 MODULES EXAM COLLECTION 2023 FINEST MOD 1-6 PRE PREDICTOR EXAM GUARANTEED PASS
Category CHEM 120 INTRODUCTION TO GENERAL, ORGANIC, AND BIOLOGICAL CHEMISTRY WITH LAB
All for this textbook (4)
Written for
Secondary school
Chemistry
4
All documents for this subject (375)
Seller
Follow
beulahbeulah
Content preview
ww.. w
w ..
wwww wwww
www.Padasalai.Net - No.1 Educational Website in Tamilnadu
N Neett N Neett
lalai .i. l a
l i
a .i. l a
l i
a
assaa WAY
aaddaas saTO
a PASS
aaddaassaa
1.
w w . P
.
What is the difference betweenPminerals and ores?
w w .P.P
www w Minerals
www
Ores w
1 Metal cannot be easily separated Metal can be easily separated
2 All minerals are not ore All ore are minerals
N Nett
e
3 e.g Bauxite, China clay
N Neett
e.g Bauxite
lalai
2..i. a
l i
a .i. l a
l i
a
What are the various steps involved in extraction of pure metals from their ores?
l
et
assaa aadd s
a aa
s
Concentration of the ore
a
Extraction of the crude metal.
ad
a a
d s
a aa
s
. P
.P . P
. P
.N
w
w
Refining of the crude metal.
w www
3.
www www
What is Flux? What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?
Material or substance that is added to molten metals in order to bind with easily
lai
removable impurities.
N Neett
Limestone act as a Flux.
N Neett
l a
l i
4.
a .i. l a
l i
a .i. l a
l i
Which type of ores can be concentrated by froth floatation method and Gravity separation?
a
sa
assaa saa
s ssaa
Give two examples for such ores.
ww. P
. P w
w . P
. P
Gravity separation method – Oxide ores (e.g)Haematite( Fe2O3) , Tinstone (SnO2)
w
www w
www
da
5. Define Gangue
The non-metallic impurities, rocky materials and siliceous matter present in the
ores are called gangue.
Pa
N Neett Eg : SiO2
N Neett
l a
l i
6.
a .i.
Define Slag
l a
lai .i. l a
l i
a
assaa aa aa
Slag is a fusible chemical substance formed by the reaction of gangue with a flux.
ddaass
Flux + gangue slag ddaass
aa aa
w.
7.
w . P
. P
Explain zone refining process with an example
w w
w . P
. P
w
www w
www
The principle is fractional crystallisation.
When an impure metal is melted and allowed to solidify, the impurities will prefer to
ww
remain in the molten region. ie; impurities are more soluble in the melt than in the
N Neettsolid state metal.
N Neett
l a
l i
a .i. l a
lai.i.
In this process the impure metal is taken in the form of a rod. One end of the rod is
l a
l i
a
assaa aa aa
heated using a mobile induction heater, melting the metal on that portion of the rod.
ddaass d a
d s
a s
When the heater is slowly moved to the other end pure metal crystallises while
.P. Paa . P
. Paa
impurities will move on to the adjacent molten zone formed due to the movement of
w w
w w w
w
www
the heater.
www
As the heater moves further away, the molten zone containing impurities also moves
along with it.
This process is repeated several times by moving the heater in the same direction
N Neett N N e e tt
lalai.i. l a
l i
a .i.
again and again to achieve the desired purity level.
l a
l i
a
assaa d d aas saa
Page 1 of 8
daassaa
Kindly send me your PP a a
questions and answerkeys to us : PP da
Padasalai.Net@gmail.coma
, ww.. w
w ..
wwww wwww
www.Padasalai.Net - No.1 Educational Website in Tamilnadu
NNe ett N Ne ett
lalai .i. This process is carried out in an inertlagas
l i
a .atmosphere
i . l a
l i
a
assaa s saa ssaa
to prevent the oxidation of
metals.
aad d aa aa d a
d bya
w w . P
.
E.g Germanium, Silicon P and Gallium which are used as .
semiconductor
w w P
.P are refined
Describe Mondw
w
ww for refining Nickel.
this process.
process 8.
www w
Mond process
NN eet t
Ni + 4 CO Ni(CO)
N Neett 4
lalai.i. Ni(CO) Ni + 4 CO
l al i
a .i. l a
l i
a
et
assaa Give the uses aa aa
4
of Borax. 9.
d da ass d a
d s
a s
. P a
identification of coloured
P a metal ions.
flux .in metallurgy. . P
. Paa
.N
It is used as aw w
It actw w
aw
w w w
w w
w
as preservative
Give the uses of silicones. 10.
w
lai
It is used for low temperature lubrication.
N Neett N Neett
It is used for making water proofing clothes.
l a
l i
a .i. l l i
a .i.
It is used as insulating material in electric motor
a l a
l i
a
sa
assaa 11. What is inert pair effect?
aaddaasaa
s
aaddaassaa
In heavier post transition metals, the outer s-electrons (ns) have a tendency to remain
ww. P
. P w
w . P
.
inert and show reluctance to take part in the bonding . P
w
www w
www
da
12. Why fluorine always exhibit an oxidation state of -1?
Small Size
It is the most electronegative element.
Pa
N Neett It can form hydrogen bonds
N Neett
l a
l i
a .i. 13.
l lai .i.
Why fluorine is more reactive than other halogens?
a l a
l i
a
assaa s aa saa
Small Size
ddaa s
It is the most electronegative element. ddaa s
aa aa
w.
ww. P
. P w
w . P
. P
Due to the minimum value of F-F bond dissociation energy
14. w
www
What are interhalogen compounds? Give examples. w
www
Each halogen combines with other halogen to from a series of compounds.
ww
E.g : Cl2 + F2 2ClF
N Neett 15. Give the uses of Helium.
N Neett
l a
l i
a .i. Used for filling air balloons.
l a
lai.i. l a
l i
a
assaa aa aa
It has lowest boiling point hence used in cryogenics.
ddaass d a
d s
a s
He-O2 Misture is used by diver in place of air oxygen mixture.
.P
Give the uses of Neon.
. Paa . P
. Paa
16.
w w
w w w
w
www www
It is used in advertisement as neon sign and the brilliant red glow is caused by
passing electric current through neon gas under low pressure.
17. Give the uses of Argon.
prevents the oxidation of hot filament.
N Neett N N e e tt
lalai.i. prolongs the life in filament bulbs
l a
l i
a .i. l a
l i
a
assaa d d aas saa
Page 2 of 8
daassaa
Kindly send me your PP a a
questions and answerkeys to us : PP da
Padasalai.Net@gmail.coma
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller beulahbeulah. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $21.99. You're not tied to anything after your purchase.
