Phys p12 and Chem p12- 9th and 10th June,2015 Tips!

[Aly Emran]

I

not A because look carefully, at 2 terminal, the current splits and moves back to the battery while the remaining current moves to the 3terminal(krichoff's 1st law)

Isn't A wrong because terminal 1 & 3 are not connected in the first place? so the circuit is not complete? correct me If I'm wrong [/QUOTE]

not A because look carefully, at 2 terminal, the current splits and moves back to the battery while the remaining current moves to the 3terminal(krichoff's 1st law)

I guess ur rite... Because the current will move from battery 1,2 and back to battery as current takes shortest path... I thought 3 was connected to 1

 

[princess Anu]

I


Isn't A wrong because terminal 1 & 3 are not connected in the first place? so the circuit is not complete? correct me If I'm wrong

I guess ur rite... Because the current will move from battery 1,2 and back to battery as current takes shortest path... I thought 3 was connected to 1 [/QUOTE]
Student uses a digital ammeter to measure a current. Reading of the ammeter is found to fluctuate between 1.98A and 2.02A. Manufacturer of the ammeter states that any reading has a systematic uncertainty of ±1%. Which value of current should be quoted by the student?
A (2.00 ± 0.01) A
B (2.00 ± 0.02) A
C (2.00 ± 0.03) A
D (2.00 ± 0.04) A

why is it B :/

 

[Aly Emran]

Student uses a digital ammeter to measure a current. Reading of the ammeter is found to fluctuate between 1.98A and 2.02A. Manufacturer of the ammeter states that any reading has a systematic uncertainty of ±1%. Which value of current should be quoted by the student?
A (2.00 ± 0.01) A
B (2.00 ± 0.02) A
C (2.00 ± 0.03) A
D (2.00 ± 0.04) A

why is it B :/

Average value of current=(1.98+2.02)/2
=2.00A

Error involved=1/100=0.01A
Remember.... Whenever u add or subtract 2 or more values, the errors are added(no matter what!)
So 0.01+0.01=0.02A

 

[princess Anu]

Average value of current=(1.98+2.02)/2
=2.00A

Error involved=1/100=0.01A
Remember.... Whenever u add or subtract 2 or more values, the errors are added(no matter what!)
So 0.01+0.01=0.02A

remember we always say taking mean reduces the error.. but here when we r taking the mean, the error is instead increasing :O

 

[princess Anu]

Average value of current=(1.98+2.02)/2
=2.00A

Error involved=1/100=0.01A
Remember.... Whenever u add or subtract 2 or more values, the errors are added(no matter what!)
So 0.01+0.01=0.02A

Why is C wrong?
I get 3 alkenes with C

 

[Aly Emran]

remember we always say taking mean reduces the error.. but here when we r taking the mean, the error is instead increasing :O

Mean reduces random error..... Systematic error always remain constant! And 0.02A is constant error value...

Why is C wrong?
I get 3 alkenes with C

Lol look at the three alkenes u made... They have same structures CH2=C(CH3)CH2CH3

 

[Aly Emran]

How do I know that covalent bonds are either weak or strong? Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element.... How to do this? I hate these qstns... Someone just tell do I have to make all the structures or there is another way? This qstn is tough :S

 

[Youknowwhoo]

Mon do they deduct marks in spaces for working if you haven't shown the workings ? And in physics too

 

[Youknowwhoo]

How do I know that covalent bonds are either weak or strong?View attachment 54768 Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element....View attachment 54769 How to do this?View attachment 54770 I hate these qstns... Someone just tell do I have to make all the structures or there is another way?View attachment 54771 This qstn is tough :SView attachment 54772

Those are typos :3
that question abt ion energy C is carbon GIV element and I think that B is Mg . The large deviation is in the C option the answer that's pretty straight rest I can't reconcile lol

 

[Youknowwhoo]

1 to 2nd IE jump is a group 1 element and 2'nd to 3rd is a Group 2 element so that's how it goes in that case biggest numbers in 4th to 5th in C so that's the answer

 

[The Sarcastic Retard]

How do I know that covalent bonds are either weak or strong?View attachment 54768 Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element....View attachment 54769 How to do this?View attachment 54770 I hate these qstns... Someone just tell do I have to make all the structures or there is another way?View attachment 54771 This qstn is tough :SView attachment 54772

Aly man!! This all are a piece of a cake.. if u are stucked in here... THERE IS HECK A LOT TO LEARN DUDE!!!
Prepare well... I am into some work so cant post the answers.... if anyone wont answer by the time i get free... I will answer 'em

 

[The Sarcastic Retard]

Mon do they deduct marks in spaces for working if you haven't shown the workings ? And in physics too

WTF.... you don't need to write anything... ??? :O YOU ARE A GENIUS!!

 

[Youknowwhoo]

WTF.... you don't need to write anything... ??? :O YOU ARE A GENIUS!!

Lol that I know . But you didn't answer my question

 

[The Sarcastic Retard]

How do I know that covalent bonds are either weak or strong?View attachment 54768 Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element....View attachment 54769 How to do this?View attachment 54770 I hate these qstns... Someone just tell do I have to make all the structures or there is another way?View attachment 54771 This qstn is tough :SView attachment 54772

1)
When chlorine/bromine/iodine exists as a diatomic molecule, the Cl-Cl/Br-Br/I-I bond is unexpectedly weak. B'coz:~
Size Cl2< Br2 < I2.The atoms are bonded close together, which leads to repulsion between free electrons in the two chlorine/bromine/iodine atoms. Sogoing down the group Van der waals forces increases..
Longer bond length = Strength of covalent bond decreases.

 

[The Sarcastic Retard]

How do I know that covalent bonds are either weak or strong?View attachment 54768 Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element....View attachment 54769 How to do this?View attachment 54770 I hate these qstns... Someone just tell do I have to make all the structures or there is another way?View attachment 54771 This qstn is tough :SView attachment 54772

2) The difference b/w 4th and 5th IE should be greatest.. option C is the correct answer.

 

[The Sarcastic Retard]

How do I know that covalent bonds are either weak or strong?View attachment 54768 Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element....View attachment 54769 How to do this?View attachment 54770 I hate these qstns... Someone just tell do I have to make all the structures or there is another way?View attachment 54771 This qstn is tough :SView attachment 54772

3) m of 2NO2 = 92
m of 1/2O2 = 16
92/16 = 1/0.174

 

[The Sarcastic Retard]

How do I know that covalent bonds are either weak or strong?View attachment 54768 Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element....View attachment 54769 How to do this?View attachment 54770 I hate these qstns... Someone just tell do I have to make all the structures or there is another way?View attachment 54771 This qstn is tough :SView attachment 54772

4) IDK any other method.. I DRAW 'EM!!

 

[fantastic girl]

How do I know that covalent bonds are either weak or strong?View attachment 54768 Why the ans is not B? 1s2 2s2 2p2 for one of grp 6 element....View attachment 54769 How to do this?View attachment 54770 I hate these qstns... Someone just tell do I have to make all the structures or there is another way?View attachment 54771 This qstn is tough :SView attachment 54772

4) 1-butene.....CH2=CHCH2CH3
2. 2-butene...CH3CH=CHCH3
3. methyl-propene...CH2=CCH3CH3...
4. the other cis-trams isomer of 2-butene

 

[The Sarcastic Retard]

4) 1-butene.....CH2=CHCH2CH3
2. 2-butene...CH3CH=CHCH3
3. methyl-propene...CH2=CCH3CH3...
4. the other cis-trams isomer of 2-butene

Give the ref link to it (Yahoo answers) he can see the other one as well....

 

[fantastic girl]

Give the ref link to it (Yahoo answers) he can see the other one as well....

alright
Aly Emran check this https://answers.yahoo.com/question/index?qid=20071107180657AAYHcII