icecalm:
you're welcome

thanks boss

Geofavor:
.

please kindly share the link to physics and English thread..thanks

.

(1) The Atomicity of any element is the number of atoms of that element that will make a molecule of the element, i.e the atomicity of oxygen (O₂) is 2, while that of ozone(O₃) is 3. Sulphur exist in it molecule state as S₈ and it atomicity is 8. C

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(2) NB: This question require knowledge of stoichiometry.
From the given data we could determine which law of chemical combination the reaction obey. First we have to write a balanced equation for the reaction.

N₂ + O₂ ——> NO + NO

Now, let us inspect the above equation to see if it's correct with the data given.
NB: The equation already failed in the R.H.S; only one type of oxide is given.

For a single mole of Nitrogen gas, half,one and two moles of oxygen gas is required to form Nitrogen peroxide, Nitrogen(ii)oxide and Nitrogen(iv)oxide respectively. dinitrogen tetraoxide (N₂O₄) may also be formed with two moles of oxygen gas.
The next step is to compare the mass of the oxides given with the mass you will obtain by calculating the mass of the above listed oxides that will likely be formed from the given mass of Nitrogen gas.
Mass of N₂=0.8
Moles of N₂ = 0.8/28mol

From the above reaction, 1mole of N₂ will form 1mol each of two different oxides, being any of the above listed oxides with oxygen. Therefore, 0.8/28mol of N₂ will form 0.8/28mol of either of two oxides.
Mass of the oxides that will be formed with 0.8/28mol of N₂:
We will be using,
Mass=mole×molar mass

Nitrogen peroxide(N₂O) = 0.8/28×44 =1.26g

Nitrogen(ii)oxide(NO) =0.8/28×30= 0.86g

Nitrogen(iv)oxide (NO₂)= 0.8/28×46=1.31g

dinitrogen tetraoxide (N₂O₄)= 0.8/28×92= 2.63g

By comparison, the oxides likely to be formed are NO and NO₂.
we proceed to write the balanced equation,
2N₂ + 3O₂ ——> 2NO₂ + 2NO
or
N₂ + 1½O₂ ——> NO₂ + NO

(NB: we balance the coefficients by inspection)
A.... Law of multiple proportion, since the O combine with N in simple multiples.
B.... Nitrogen(iv)oxide and Nitrogen(ii)oxide
C....same mass of the oxides as those given in the question would be formed when 0.8g of Nitrogen gas is mixed with 2.89g of Oxygen gas and only 1.37g of the Oxygen gas will react, while the others will remain as excess.

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(3) first we write a balanced equation for the reaction;
C + O₂ ——> CO₂
From the equation 1mole of carbon(vi)oxide will be produce from 1mole of Oxygen gas.

Molar volume of gas at stp 22.4dm³ and this is equivalent to 22400cm³

Volume of oxygen gas required to produce 5mol of CO₂= 22400×5 = 112000cm³. A

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I WILL EXPLAIN Q 4-10 TOMORROW. walanter, abuhubaidah, geoflavor and others

Not very good @typing, I would have shown all my workings. How do you type ur superscript nd subscript? I use Android thou.

No4:b, 5:c, 6:b, 7: I guess u made typo error 8:C3H8+5O2=3CO2+4H2O. 9:c 10:b.

OluchiDelly:
Not very good @typing, I would have shown all my workings. How do you type ur superscript nd subscript? I use Android thou.

No4:b, 5:c, 6:b, 7: I guess u made typo error 8:C3H8+5O2=3CO2+4H2O. 9:c 10:b.

good, keep it up..... check Q 6 & 10 the correct ans. is D and D

OluchiDelly:
Not very good @typing, I would have shown all my workings. How do you type ur superscript nd subscript? I use Android thou.

No4:b, 5:c, 6:b, 7: I guess u made typo error 8:C3H8+5O2=3CO2+4H2O. 9:c 10:b.

for subscript use [sub.]put in what you want to subscript here[/sub.],,,,,, do it without the dot if not it won't work.
do the same for superscript but this time use sup instead of sub.

Geofavor:

yeah, but it's beyond waec scope

Hi... Please what's the difference between a REAL GAS and an IDEAL GAS?

prof icecalm, I'm sorry, I've been quite tied down. I've got a little problem managing my time.

SuperNover:

Hi... Please what's the difference between a REAL GAS and an IDEAL GAS?

an ideal gas adheres strictly to the gas laws. but real gases don't totally obey the laws.

Geofavor:

an ideal gas adheres strictly to the gas laws. but real gases don't totally obey the laws.

.. Thanks...

In reality, do we truly have ideal gases?

icecalm:
good, keep it up..... check Q 6 & 10 the correct ans. is D and D

OK noted. No 6, I never knew is D, cos Rutherford too worked extensively on atomic n nuclear chemistry. that is why I gav him d shot. Not knowing he didn't touch atomic symbols.
No 10, I forgot to put d moles into consideration. I only looked from Graham's angle but forgot to look from Avogadro's as well.
Thank you. I will be xpecting more Q.

SuperNover:
.. Thanks...
In reality, do we truly have ideal gases?

no, we don't. U seem to ask not because u don't know, but to tempt.

OluchiDelly:

no, we don't.

Thanks a million. I've been having trouble with that for a while now.

U seem to ask not because u don't know, but to tempt.

You think so?.... Funny..... Well, that's not it, Miss oluchi

Geofavor:
prof icecalm, I'm sorry, I've been quite tied down. I've got a little problem managing my time.

me too, we have to move the thread forward what's the next chapter. I'm finding it difficult to type this days, if not I would have complete the explanation.

Hi icecalm, geofavor, its being long i came here i've been very busy. How is the ministry moving?

icecalm:
me too, we have to move the thread forward what's the next chapter. I'm finding it difficult to type this days, if not I would have complete the explanation.

lol, why did you cancel the "prof"? You're one of our profs here nau .
Okay i think i will be more available now. Let's revive this thread.
The next topic should be acids, bases and salts.

DebbyChris:
Hi icecalm, geofavor, its being long i came here i've been very busy.
How is the ministry moving?

not too good. But now it's about to resume activities with full force.
Welcome back

Geofavor:
not too good. But now it's about to resume activities with full force. Welcome back

Ok

Geofavor:

lol, why did you cancel the "prof"? You're one of our profs here nau .
Okay i think i will be more available now. Let's revive this thread.
The next topic should be acids, bases and salts.

okay, but you guys have to study the topics. i will post questions on monday and the explanation on Friday, then followed by a summary. And more like a classroom after your studies within the week you could tender your questions. i really want to help now because i will be going back to school next month

DebbyChris:
Hi icecalm, geofavor, its being long i came here i've been very busy.
How is the ministry moving?

you are welcome back

If you still need the explanation for the rest questions, just qoute me or OluchiDelly

icecalm:
okay, but you guys have to study the topics. i will post questions on monday and the explanation on Friday, then followed by a summary. And more like a classroom after your studies within the week you could tender your questions. i really want to help now because i will be going back to school next month

okay, thanks a lot. We will be expecting the questions.

---

(1) Acidity is not an inherent property of a substance but rather a more behavior of a substance under certain conditions.
True/False

---

(2) Acid is defined as a substance which donates a proton by_______
(A) Bronsted-Lowry
(B) Arrhenius
(C) Lewis
(D) Non of above

---

(3) ________ is not an organic acid
(A) Propanoic acid
(B) Valeric acid
(C) Nitrous acid
(D) Lactic acid

---

(4) Acid in solution will dissociate to produce hydrogen ions or protons as the only positive ion, is of who?
(A) Lewis
(B) Alexander
(C) Arrhenius
(D) Millikan

---

(5) Strong acid is _____
(A) slippery to touch
(B) Coarse when rubbed between fingers
(C) Corrosive
(D) Orange in colour

---

(6) A substance that neutralize an acid to yield salt and water only is_____
(A) Alcohol
(B) Base
(C) Phenol
(D) Amide

---

(7) ______has a bitter taste.
(A) Base
(B) Acid
(C) Alkanoate
(D) A and B

---

(8.) A compound that could be use to dry all gases is_______
(A) Silica gel
(B) Calcium oxide
(C) Calcium chloride
(D) Concentrated tetraoxosulphate(VI) acid

---

(9) Calcium chloride may dry all gases except_______
(A) Hydrogen sulphide
(B) Acetylene
(C) Hydrogen chloride
(D) Ammonia

---

(10) Substance that absorb large amount of water on exposure to the atmosphere and eventually turn into solution is said to be _______
(A) Hygroscopic
(B) Deliquescent
(C) Efflorescent
(D) Florescent

---

(11) Washing soda is an example of _______ compounds
(A) Efflorescent
(B) Hygroscopic
(C) Deliquescent
(D) Effervescent

---

(12) _______ is a complex salt.
(A) KAl(SO₄) ₂
(B) K₄Fe(CN) ₆
(C) NaHSO₄
(D) Zn(OH)Cl

---

(13) Weak acid ionize______
(A) Completely
(B) Incompletely
(C) Strongly
(D) Explosively

---

(14) Calcium hydroxide is used in the manufacture of ______
(A) Cement
(B) Iron
(C) Explosive
(D) Soap

---

(15) ______ is used in the manufacture of gun powder and matches
(A) Silver trioxonitrate(V)
(B) Calcium tetraoxosulphate(VI)
(C) Potassium trioxonitrate(V)
(D) Copper II tetraoxosulphate(VI)

---

(16) Which of the following salts is insoluble in water?
(A) Silver trioxonitrate(V)
(B) Barium trioxonitrate(V)
(C) Calcium chloride
(D) Silver chloride

---

(17) The Ph of a 0.5M NaOH is ______
(A) 1.3
(B) 13.7
(C) 5.3
(D) 11.7

---

(18) Insoluble salts are mostly prepared by _______
(A) Neutralization
(B) Double decomposition
(C) Dilution
(D) Condensation

---

(19) The Ph of a 1.8×10^-3M HCl is
(A) 2.7
(B) 2.3
(C) 4.3
(D) 10.5

---

(20) The basicity of phosphoric acid is________
(A) 3
(B) 5
(C) 6
(D) 2

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geoflavor, debbychris, OluchiDelly and others

1True2A3C4C5C6B7A8A9D10C11A12B13B14A15C16A17B18B19C20D

Icecalm

Sorry are u also a jambite?

IamLukas:


Icecalm


Sorry are u also a jambite?

No, a student of uniben

1.true 2.No idea, pls which textbook are u using? i can't find that in my new school chemistry.
3.A 4.No idea 5.C 6.B 7.A 8.A 9.D 10.B 11.A 12.B 13.B 14.A 15.C 16.D 17.No idea 18.B 19.No idea 20.A

Ok

icecalm:
No, a student of uniben

icecalm:

---

(1) Acidity is not an inherent property of a substance but rather a more behavior of a substance under certain conditions.
True /False

---

(2) Acid is defined as a substance which donates a proton by_______
(A) Bronsted-Lowry
(B) Arrhenius
(C) Lewis
(D) Non of above

---

(3) ________ is not an organic acid
(A) Propanoic acid
(B) Valeric acid
(C) Nitrous acid
(D) Lactic acid

---

(4) Acid in solution will dissociate to produce hydrogen ions or protons as the only positive ion, is of who?
(A) Lewis
(B) Alexander
(C) Arrhenius
(D) Millikan

---

(5) Strong acid is _____
(A) slippery to touch
(B) Coarse when rubbed between fingers
(C) Corrosive
(D) Orange in colour

---

(6) A substance that neutralize an acid to yield salt and water only is_____
(A) Alcohol
(B) Base
(C) Phenol
(D) Amide

---

(7) ______has a bitter taste.
(A) Base
(B) Acid
(C) Alkanoate
(D) A and B

---

(8.) A compound that could be use to dry all gases is_______
(A) Silica gel
(B) Calcium oxide
(C) Calcium chloride
(D) Concentrated tetraoxosulphate(VI) acid

---

(9) Calcium chloride may dry all gases except______
(A) Hydrogen sulphide
(B) Acetylene
(C) Hydrogen chloride
(D) Ammonia

---

(10) Substance that absorb large amount of water on exposure to the atmosphere and eventually turn into solution is said to be _______
(A) Hygroscopic
(B) Deliquescent
(C) Efflorescent
(D) Florescent

---

(11) Washing soda is an example of _______ compounds
(A) Efflorescent
(B) Hygroscopic
(C) Deliquescent
(D) Effervescent

---

(12) _______ is a complex salt.
(A) KAl(SO₄) ₂
(B) K₄F(CN) ₆
(C) NaHSO₄
(D) Zn(OH)Cl

---

(13) Weak acid ionize______
(A) Completely
(B) Incompletely
(C) Strongly
(D) Explosively

---

(14) Calcium hydroxide is used in the manufacture of ______
(A) Cement
(B) Iron
(C) Explosive
(D) Soap

---

(15) ______ is used in the manufacture of gun powder and matches
(A) Silver trioxonitrate(V)
(B) Calcium tetraoxosulphate(VI)
(C) Potassium trioxonitrate(V)
(D) Copper II tetraoxosulphate(VI)

---

(16) Which of the following salts is insoluble in water?
(A) Silver trioxonitrate(V)
(B) Barium trioxonitrate(V)
(C) Calcium chloride
(D) Silver chloride

---

(17) The Ph of a 0.5M NaOH is ______
(A) 1.3
(B) 13.7
(C) 5.3
(D) 11.7

---

(18) Insoluble salts are mostly prepared by _______
(A) Neutralization
(B) Double decomposition
(C) Dilution
(D) Condensation

---

(19) The Ph of a 1.8×10^-3M HCl is
(A) 2.7
(B) 2.3
(C) 4.3
(D) 10.5 (i don't know the calculations yet.)

---

(20) The basicity of phosphoric acid is________
(A) 3
(B) 5
(C) 6
(D) 2

---

geoflavor

i didn't see this on time cos i didn't get the mention.

DebbyChris:
1.true 2.No idea, pls which textbook are u using? i can't find that in my new school chemistry.

Lol. Get yourself LAMLAD, sis. Depending only on new school is risky. Lamlad is a kind of jamb preparatory textbook: it helps you revise topics effectively. The textbook's succint explanations are impeccable. And you'll find some vital information (which new school didn't provide) in it.

[quote author=Geofavor post=39432033] How much is the LAMLAD?